Publications by authors named "Haoran Yuan"

23 Publications

  • Page 1 of 1

Catalytic fast pyrolysis of waste mixed cloth for the production of value-added chemicals.

Waste Manag 2021 May 29;127:141-146. Epub 2021 Apr 29.

Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences (CAS), Guangzhou 510640, PR China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), 511458, PR China; CAS Key Laboratory of Renewable Energy, Guangzhou 510640, PR China; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, PR China.

In the present study, catalytic fast pyrolysis of waste mixed cloth in an ex-situ method using hierarchical HZSM and commercial CaO was investigated. Pyrolysis of waste mixed cloth in a temperature range of 450 °C to 750 °C mainly allowed for the formation of levoglucosan without any catalysts. The utilization of HZSM with Brønsted/Lewis acid sites on micro- and mesoporous structures significantly contributed to monocyclic/dicyclic chemicals production, mainly referring to monoaromatics and naphthalene-based derivatives, especially in the case of high heating rates and catalyst usages. Furthermore, CaO revealed strong deoxygenation performance for the transformation of waste mixed cloth into low oxygen-containing chemicals, such as ketones, aliphatic hydrocarbons and aromatics. The present research thus highlights a feasible route for the catalytic upgrading of waste mixed cloth into some kinds of value-added chemicals.
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http://dx.doi.org/10.1016/j.wasman.2021.04.036DOI Listing
May 2021

Mechanism Identification and Kinetics Analysis of Thermal Degradation for Carbon Fiber/Epoxy Resin.

Polymers (Basel) 2021 Feb 14;13(4). Epub 2021 Feb 14.

College of Airworthiness, Civil Aviation University of China, Tianjin 300300, China.

For carbon fiber epoxy resin used in aerostructure, thermal degradation mechanism and kinetics play an important role in the evaluation of thermal response and combustion characteristics. However, the thermal decomposition process and mechanism are difficult to unify strictly due to the complexity of the components from different suppliers. In the present study, a product of carbon fiber epoxy resin made by AVIC (Aviation Industry Corporation of China) composite corporation is examined to identify its thermal degradation mechanism and pyrolysis products by measurements, including simultaneous thermal analysis, Fourier transform infrared spectroscopy and mass spectrometry, establish the kinetic model by Kissinger/Friedman/Ozawa/Coats-Redfern methods. The results show thermal degradation occurs in three steps under the inert atmosphere, but in four steps under air atmosphere, respectively. The first two steps in both environments are almost the same, including drying, carbon dioxide escape and decomposition of the epoxy resin. In the third step of inert atmosphere, phenol is formed, methane decreases, carbon monoxide basically disappears and carbon dioxide production increases. However, in air, thermal oxidation of the carbonaceous residues and intermolecular carbonization are observed. Furthermore, thermal degradation reaction mechanism submits to the F model. These results provide fundamental and comprehensive support for the application of carbon fiber epoxy resin in aircraft industry.
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http://dx.doi.org/10.3390/polym13040569DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7917751PMC
February 2021

A new mechanism and kinetic analysis for the efficient conversion of inorganic bromide in waste printed circuit board smelting ash via traditional sulfated roasting.

J Hazard Mater 2021 07 12;413:125394. Epub 2021 Feb 12.

Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, PR China; Institute of Circular Economy, Beijing University of Technology, Beijing 100124, PR China.

The waste printed circuit board smelting ash (WPCB-SA) produced in the waste printed circuit board smelting process is a hazardous material that not only contains valuable metals, but also contains a large amount of toxic and harmful inorganic bromides. The utilization of metals has received considerable attention in previous studies, but the recovery of hazardous bromides requires further study. In this article, a new idea of converting inorganic bromine in WPCB-SA by traditional sulfated roasting is proposed. Debromination kinetics under simulated experimental conditions are discussed, and kinetic equations are established. The kinetic results show that during low-temperature sulfated roasting, the conversion of Br in CuBr and PbBr conforms to the chemical reaction diffusion model and diffusion control the product layer model, respectively. A possible reaction mechanism is also proposed. Our research shows that the conversion of Br in CuBr is divided into three processes: covalent bond decomposition, hydrogen ion form acid, copper ion form salt, and HBr oxidation conversion, whereas the conversion of Br in PbBr is divided into two processes: sulfuric acid ionization, lead ion form salt and HBr oxidation conversion. This work provides the theoretical basis for the improvement and application of inorganic bromide recovery technology in WPCB-SA.
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http://dx.doi.org/10.1016/j.jhazmat.2021.125394DOI Listing
July 2021

Effect of potassium on the pyrolysis of biomass components: Pyrolysis behaviors, product distribution and kinetic characteristics.

Waste Manag 2021 Feb 1;121:255-264. Epub 2021 Jan 1.

Chongqing Environment&Sanitation Group CO., LTD, Chongqin 401121, China.

Potassium is an inorganic mineral element in biomass and has a significant catalytic effect on biomass pyrolysis. In this work, the effect of potassium on the pyrolysis of biomass components (cellulose, xylan and lignin) was investigated with the help of thermogravimetric analyzer coupled to fourier transform infrared spectrometer (TG-FTIR) and pyrolysis-gas chromatography coupled to mass spectrometry (Py-GC/MS). The results showed that potassium accelerated the start of the main pyrolysis stage of the biomass components, reduced the weight loss rate for cellulose and lignin, and increased the weight loss rate for xylan. On the other hand, potassium presented a promotion effect on the formation of char for cellulose but a suppression effect for lignin. In addition, an increasing potassium content promoted the release of volatile products for xylan. Product distribution analysis found that potassium promoted the scission of glycosidic bonds and the decomposition of glucose units, resulting in a sharp yield decrease of carbohydrates and a yield increase of furans, aldehydes and ketones. In addition, an increased production of CO was obtained, indicating that potassium favors the cleavage and reforming of carboxyl (COOH) and carbonyl (CO) groups. Furthermore, the effect of potassium on the pyrolysis of cellulose and xylan was stronger than that on lignin pyrolysis. The effect on the pyrolysis reaction also resulted in a higher activation energy for the decomposition of biomass components, especially at high temperature intervals. Moreover, the higher the content of potassium added, the greater the increase was in the activation energy.
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http://dx.doi.org/10.1016/j.wasman.2020.12.023DOI Listing
February 2021

General Fabrication of 3D Hierarchically Structured Bamboo-like Nitrogen-Doped Carbon Nanotube Arrays on 1D Nitrogen-Doped Carbon Skeletons for Highly Efficient Electromagnetic Wave Energy Attenuation.

ACS Appl Mater Interfaces 2020 Sep 27;12(36):40692-40701. Epub 2020 Aug 27.

Key Laboratory of In-Fiber Integrated Optics, and College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001, China.

Hierarchically three-dimensional (3D) micro-nanostructures have promising applications in multifarious fields. Herein, we report a general strategy, that is, in situ catalysis process, for fabrication of nitrogen-doped carbon nanotube (NCNT) arrays on one-dimensional (1D) nitrogen-doped carbon (NC) skeletons. The NCNT arrays branch out from the 1D NC surfaces, resulting in the formation of hierarchically 3D micro-nanostructures. The strategy is involved in the pyrolysis of M-precursor (M = Fe, Co, and Ni) nanowires with the assistance of dicyandiamide. During the synthesis process, the metal components in the precursors serve as catalysts for growing NCNTs, while dicyandiamide provides carbon and nitrogen sources. With the ongoing reaction, the NCNTs were catalytically grown and branched out from 1D NC skeletons. Through the strategy, three kinds of hierarchically 3D structures with encapsulated Fe/FeC, Co, and Ni nanoparticles, respectively, were fabricated successfully. As functional materials for attenuating electromagnetic wave energy, these hierarchically 3D structures exhibit satisfactory performances even at a low matching thickness, exceeding most of the carbon-based materials. Typically, the minimal reflection losses of the 3D structures can reach -10.0 dB even as the matching thickness is in the range of 1.4-2.0 mm. Experimental results demonstrate that the excellent attenuation properties toward electromagnetic wave energy are relative to high conduction loss at a low frequency and high dielectric relaxations at a high frequency as well as better impedance matching with the input impedance of the free space. Our method presented here opens a general way for the development of hierarchically 3D carbon-based micro-nanostructures for their practical applications.
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http://dx.doi.org/10.1021/acsami.0c12413DOI Listing
September 2020

Carbon dioxide reduction to multicarbon hydrocarbons and oxygenates on plant moss-derived, metal-free, in situ nitrogen-doped biochar.

Sci Total Environ 2020 Oct 18;739:140340. Epub 2020 Jun 18.

Guangzhou Institute of Energy Conversion, CAS Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou 510640, China; The Southern Marine Science and Engineering Guangdong Laboratory, Guangzhou 510650, China; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510650, China.

Electrochemical reduction of carbon dioxide (CO) is considered a promising renewable energy conversion technology, but it remains challenging to find active, stable, low-cost, and highly efficient electrocatalysts for the CO conversion. Here, we develop an in situ nitrogen-doped, metal-free, porous biochar from plant moss to catalyze the electrochemical reduction of CO into methane (CH), methanol (CHOH) and ethanol (CHOH) at high current densities and low overpotentials. Using this metal-free biochar electrocatalyst, production rates of approximately 36.1, 32.1, and 18.1 μg h cm towards CH, CHOH, and CHOH are obtained with Faradaic efficiencies of 56.0%, 26.0% and 10.5%, respectively. In addition, the total faradaic efficiency reaches 92.6% at -1.2 V (vs. Ag/AgCl) with good stability. A favorable pathway for the electrochemical reduction of CO over the metal-free biochar is also provided. This study presents a new approach to produce cost-effective, in situ nitrogen-doped porous biochars with excellent efficiency and durability for the electrochemical reduction of CO.
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http://dx.doi.org/10.1016/j.scitotenv.2020.140340DOI Listing
October 2020

Calcium-Loaded Municipal Sludge-Biochar as an Efficient and Stable Catalyst for Biodiesel Production from Vegetable Oil.

ACS Omega 2020 Jul 6;5(28):17471-17478. Epub 2020 Jul 6.

School of Mechanical and Power Engineering, Nanjing Technology University, Nanjing 211816, China.

In this contribution, biochar from municipal sludge was used as a novel matrix for the synthesis of a series of calcium-based heterogeneous catalysts toward biodiesel production. Their catalytic activity was investigated in terms of catalyst loading and calcination temperature during preparation, in addition to the transesterification parameters including the methanol/oil molar ratio, reaction time, and catalyst amount. The highest biodiesel yield up to 93.77% was achieved with the 30Ca/A-SBC-700, and it maintained as high as 84.9% even after 10 cycles of a consecutively alternating catalysis and regeneration process. It was revealed that the porous municipal sludge biochar and autologous SiO were accountable for the superior stability of the present catalyst. This work may provide a new path to value-added valorization of sludge waste and also a renewable and efficient catalyst for biodiesel production at a low cost.
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http://dx.doi.org/10.1021/acsomega.0c01970DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7377231PMC
July 2020

Urchin-like Amorphous Nitrogen-Doped Carbon Nanotubes Encapsulated with [email protected] [email protected] Nanoparticles for Microwave Energy Attenuation.

ACS Appl Mater Interfaces 2020 Feb 17;12(8):9628-9636. Epub 2020 Feb 17.

Key Laboratory of In-Fiber Integrated Optics, Ministry of Education and College of Science , Harbin Engineering University , Harbin 150001 , China.

Herein, we report three-dimensional (3D) urchin-like amorphous nitrogen-doped CNT (NCNT) arrays with embedded [email protected] [email protected] nanoparticles (NPs) in the inner parts of NCNTs ([email protected]@NCNTs) for highly efficient absorption toward microwave (MW). The CoNi NPs are covered with about seven layers of graphene shell, resulting in the formation of [email protected] core-shell structures. In the meanwhile, the [email protected] core-shell NPs are further encapsulated within NCNTs. Benefitting from the multiple scattering of the unique 3D structure toward MW, cooperative effect between magnetic loss and dielectric loss, and additional interfacial polarizations, the 3D urchin-like [email protected]@NCNTs exhibit excellent MW energy attenuation ability with a broad absorption bandwidth of 5.2 GHz with a matching thickness of merely 1.7 mm, outperforming most reported absorbers. Furthermore, the chemical stability of the 3D urchin-like [email protected]@NCNTs is improved greatly due to the presence of the graphene coating layers and outmost NCNTs, facilitating their practical applications. Our results highlight a novel strategy for fabrication of 3D nanostructures as high-performance MW-absorbing materials.
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http://dx.doi.org/10.1021/acsami.9b20412DOI Listing
February 2020

Large-Scale Synthesis of Three-Dimensional Reduced Graphene Oxide/Nitrogen-Doped Carbon Nanotube Heteronanostructures as Highly Efficient Electromagnetic Wave Absorbing Materials.

ACS Appl Mater Interfaces 2019 Oct 9;11(42):39100-39108. Epub 2019 Oct 9.

Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, and School of Physics and Electronic Engineering , Harbin Normal University , Harbin 150025 , China.

Herein, we use reduced graphene oxide as a substrate and NiFe as a catalyst to fabricate three-dimensional (3D) nitrogen-doped carbon nanotube (NCNT)/reduced graphene oxide heteronanostructures (3D NiFe/N-GCTs). The 3D NiFe/N-GCTs are composed of two-dimensional (2D) reduced graphene oxide-supported one-dimensional (1D) NiFe nanoparticle-encapsulated NCNT arrays. The NCNTs exhibit bamboo-like shapes with the length and diameter of 3-10 μm and 15-45 nm, respectively. Besides integration of advantages of 1D and 2D nanomaterials, the 3D NiFe/N-GCT heteronanostructure possesses interconnected network structures, sufficient interfaces, numerous defects, hundreds of void spaces enclosed by bamboo joints and the walls of the NCNT in an individual carbon nanotube, and large surface areas, which can improve their dielectric losses toward electromagnetic wave. Thus, the 3D NiFe/N-GCTs show satisfied property toward electromagnetic wave absorption. Typically, the optimized 3D NiFe/N-GCT displays excellent minimal reflection loss (-40.3 dB) and outstanding efficient absorption bandwidth (4.5 GHz), outperforming most of the reported absorbers. Remarkably, the synthesis of 3D NiFe/N-GCTs only involves vacuum freeze-drying and subsequent thermal treatment process at a high temperature, and thus, the large-scale production of 3D NiFe/N-GCTs can be achieved in each batch, affording the possibility of the practical applications of the 3D NiFe/N-GCTs.
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http://dx.doi.org/10.1021/acsami.9b13751DOI Listing
October 2019

A novel sewage sludge biochar and ferrate synergetic conditioning for enhancing sludge dewaterability.

Chemosphere 2019 Dec 10;237:124339. Epub 2019 Jul 10.

Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, PR China; CAS Key Laboratory of Renewable Energy, Guangzhou, 510640, PR China; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou, 510640, PR China.

A great prospect of sewage sludge self-recycling as a conditioner supports the research. A synergetic conditioning effect and mechanism were reflected after the synergistic conditioning experiment, and the corresponding separated experiment of biochar, KFeO or acid treatment on WAS. All of the biochar, KFeO and acid treatment could reduce the water content of sludge cake. Biochar had good effect on WAS settleability, although the influence of the biochar dosage was weak. Similar to KFeO acid treatment also could reinforce the disintegration degree effectively, but it deteriorated the filter property of WAS. In the situation of synergistic condition, owing to the strong oxidation of KFeO, most of the sludge flocs was disintegrated, thus the settleability and filter property of WAS were still bad, even the biochar worked as a skeleton builder. It is encouraging to find that, even without acid treatment, there is a great decline of water content of sludge cake in the situation of synergistic condition.
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http://dx.doi.org/10.1016/j.chemosphere.2019.07.070DOI Listing
December 2019

Epidermal growth factor receptor mimotope alleviates renal fibrosis in murine unilateral ureteral obstruction model.

Clin Immunol 2019 08 29;205:57-64. Epub 2019 May 29.

Department of Nephrology, Shanghai Fifth People's Hospital, Fudan University, No. 801, Heqing Road, Shanghai 200240, PR China.

Macrophages have been recognized as a vital factor that can promote renal fibrosis. Previously we reported that the EGFR mimotope could alleviate the macrophage infiltration in the Sjögren's syndrome-like animal model. In current study, we sought to observe whether the active immunization induced by the EGFR mimotope could ameliorate renal fibrosis in the murine Unilateral Ureteral Obstruction (UUO) model. A series of experiments showed the EGFR mimotope immunization could ameliorate renal fibrosis, reduce the expressions of fibronectin, α-SMA and collagen I and alleviate the infiltrations of F4/80+ macrophages in UUO model. Meanwhile, the EGFR mimotope immunization could inhibit the EGFR downstream signaling. Additionally, the frequency of and F4/80+CD9+/FAS+ macrophages significantly increased in spleen after the EGFR mimotope immunization. These evidence suggested that the EGFR mimotope could alleviate renal fibrosis by both inhibiting EGFR signaling and promoting macrophages apoptosis.
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http://dx.doi.org/10.1016/j.clim.2019.05.014DOI Listing
August 2019

A novel TiO/biochar composite catalysts for photocatalytic degradation of methyl orange.

Chemosphere 2019 May 24;222:391-398. Epub 2019 Jan 24.

Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, China; CAS Key Laboratory of Renewable Energy, Guangzhou, 510640, China; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou, 510640, China. Electronic address:

A series of TiO/biochar composite catalysts were prepared by the hydrolysis method for the degradation of methyl orange, where biochar was obtained from the pyrolysis of waste walnut shells. The catalysts were examined by scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), photoluminescence spectroscopy (PL) and X-ray photoelectron spectroscopy (XPS), elemental analysis and ultra violet-visible diffuse reflectance spectroscopy (UV-vis DRS). The photocatalytic activity results showed that the catalysts noted as CT0.1/1, CT0.2/2 and CT 0.5/1 exhibited higher catalytic activity than that of pure TiO. Besides, catalyst CT0.2/1 exhibited the highest catalytic activity (the decolorization efficiency of 96.88% and the mineralization efficiency of 83.23% were obtained), attributed to the synergistic effect of biochar and TiO, while CT1/1 possessed the lowest activity due to the shelter of light by the excess biochar. After 5 repeated use, the catalyst CT0.2/1 still exhibited rather high activity toward the degradation of MO, where the decolorization efficiency and mineralization efficiency of MO achieved 92.45% and 76.56%, and the loss of activity was negligible.
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http://dx.doi.org/10.1016/j.chemosphere.2019.01.132DOI Listing
May 2019

Chlorine migration mechanisms during torrefaction of fermentation residue from food waste.

Bioresour Technol 2019 Jan 25;271:9-15. Epub 2018 Aug 25.

School of Mechanical and Power Engineering, Nanjing Technology University, Nanjing 211816, China; Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China; CAS Key Laboratory of Renewable Energy, Guangzhou 510640, China; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China; School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China.

Fermentation residue from food waster (FRFW) has a large amount of residual chlorine (Cl), and the high-salt of FRFW is either landfilled or treated as a fertilizer. The transfer of chlorine to the atmosphere and soil can cause pollution and soil salinization. This work primarily investigated the combined forms and migration mechanisms of Cl during the torrefaction of FRFW from 250 to 400 °C. The results showed that the form and amount of Cl released during the torrefaction of FRFW depended on temperature. The absolute content of soluble Cl and total Cl in torrefied solid products decreased, and the absolute content of insoluble Cl reached a maximum at 350 °C, which indicated that some soluble Cl was transferred to the insoluble Cl (CCl forms). The Cl-containing products in non-condensable gas was too little to be detected, so the majority of the reduced Cl was in liquids with different organic compounds.
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http://dx.doi.org/10.1016/j.biortech.2018.08.098DOI Listing
January 2019

Hollow N-Doped Carbon Polyhedron Containing CoNi Alloy Nanoparticles Embedded within Few-Layer N-Doped Graphene as High-Performance Electromagnetic Wave Absorbing Material.

ACS Appl Mater Interfaces 2018 Jul 13;10(29):24920-24929. Epub 2018 Jul 13.

Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, and School of Physics and Electronic Engineering , Harbin Normal University , Harbin 150025 , China.

Magnetic metal nanostructures have exhibited good electromagnetic wave (EMW) absorption properties. However, the surface of the nanostructures is easily oxidized upon exposure to air, leading to the bad stability of the EMW absorption properties. We use metal-organic framework structure as a template to fabricate hollow N-doped carbon polyhedron containing CoNi alloy nanoparticles embedded within N-doped graphene ([email protected]). The atomic ratio of Co/Ni can be tuned from 1:0.54 to 1:0.91 in the hollow [email protected] Experimental results demonstrate that the EMW absorption properties of the [email protected] can be improved through the Ni introduction and increased with an increase of the Ni content. Typically, the minimal reflection loss of the optimal [email protected] can reach -24.03 dB and the effective absorption bandwidth (reflection loss below -10 dB) is as large as 4.32 GHz at the thickness of 2.5 mm. Furthermore, our [email protected] exhibit favorably comparable or superior EMW absorption properties to other magnetic absorbers. In addition, because the CoNi alloy nanoparticles are coated with N-doped graphene layers, their surface oxidation behavior can be efficiently limited. The mechanism of the enhanced EMW absorption property is relevant to the enhanced dielectric loss and better impedance matching characteristic caused by the Ni incorporation.
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http://dx.doi.org/10.1021/acsami.8b07107DOI Listing
July 2018

Steamed cake-derived 3D carbon foam with surface anchored carbon nanoparticles as freestanding anodes for high-performance microbial fuel cells.

Sci Total Environ 2018 Sep 3;636:1081-1088. Epub 2018 May 3.

Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China; Key Laboratory of Renewable Energy, Chinese Academy of Sciences, China; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, China.

Anode design is highly significant for microbial fuel cells, since it simultaneously serves as the scaffold for electroactive microorganisms and as a medium for electron migration. In this study, a stiff 3D carbon foam with surface anchored nitrogen-containing carbon nanoparticles was facilely constructed via in-situ polyaniline coating of carbonized steamed cake prior to the carbonization process. The resultant product was determined to be an excellent freestanding anode that enabled the microbial fuel cell to deliver a maximum power density of up to 1307 mW/m, which significantly outperformed its non-coated counterpart, the widely used commercial carbon felt. Further investigations revealed that the overall performance enhancement was associated with the open porosity, enlarged electroactive surface, increased biocompatibility, and decreased electric resistance of the anode scaffold. This promising anode material would offer a green and economical option for fabricating high-performance microbial fuel cell-based devices towards various ends.
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http://dx.doi.org/10.1016/j.scitotenv.2018.04.367DOI Listing
September 2018

Optimization of ionic liquids-based microwave-assisted hydrolysis of puerarin and daidzein derivatives from Radix Puerariae Lobatae extract.

Food Chem 2018 Aug 27;256:149-155. Epub 2017 Dec 27.

Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, People's Republic of China; Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou 510640, People's Republic of China. Electronic address:

Ionic liquids-based microwave-assisted hydrolysis was successfully applied for hydrolysis of puerarin and daidzein derivatives from Radix Puerariae Lobatae extract. The ionic liquids with different cations and anions have been investigated, and [Omim]HSO was selected as catalyst. In addition, the hydrolysis parameters, including catalyst quantity, ionic liquids concentration, microwave power and microwave time, were optimized by Response Surface Methodology. The optimal conditions were as follows: 0.82 mol/L [Omim]HSO; catalyst quantity, 1.42 mL; microwave time, 7 min; microwave power, 400 W. Under those condition the average hydrolysis efficiency of puerarin and daidzein derivatives was 57.93 ± 3.08%. Compared with the traditional acidic catalysts, the [Omim]HSO exhibited higher efficiency, which demonstrates that ionic liquids-based microwave-assisted hydrolysis was a rapid, efficient, and simple hydrolysis technique.
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http://dx.doi.org/10.1016/j.foodchem.2017.12.080DOI Listing
August 2018

Nickel Nanoparticle Encapsulated in Few-Layer Nitrogen-Doped Graphene Supported by Nitrogen-Doped Graphite Sheets as a High-Performance Electromagnetic Wave Absorbing Material.

ACS Appl Mater Interfaces 2018 Jan 19;10(1):1399-1407. Epub 2017 Dec 19.

Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, and School of Physics and Electronic Engineering, Harbin Normal University , Harbin 150025, China.

Herein we develop a facile strategy for fabricating nickel particle encapsulated in few-layer nitrogen-doped graphene supported by graphite carbon sheets as a high-performance electromagnetic wave (EMW) absorbing material. The obtained material exhibits sheetlike morphology with a lateral length ranging from a hundred nanometers to 2 μm and a thickness of about 23 nm. Nickel nanoparticles with a diameter of approximately 20 nm were encapsulated in about six layers of nitrogen-doped graphene. As applied for electromagnetic absorbing material, the heteronanostructures exhibit excellent electromagnetic wave absorption property, comparable to most EMW absorbing materials previously reported. Typically, the effective absorption bandwidth (the frequency region falls within the reflection loss below -10 dB) is up to 8.5 GHz at the thicknesses of 3.0 mm for the heteronanostructures with the optimized Ni content. Furthermore, two processes, carbonization at a high temperature and subsequent treatment in hot acid solution, were involved in the preparation of the heteronanostructures, and thus, mass production was achieved easily, facilitating their practical applications.
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http://dx.doi.org/10.1021/acsami.7b15559DOI Listing
January 2018

Evaluation of a TPTX model induced by ischemia.

Exp Anim 2017 Oct 3;66(4):345-356. Epub 2017 Jul 3.

Department of General Surgery, The Fifth People's Hospital of Shanghai, Fudan University, 801 Heqing Road, Minhang District, Shanghai 200240, P.R. China.

Parathyroidectomy (PTX), especially total parathyroidectomy (TPTX), is often recommended for severe secondary hyperparathyroidism (SHPT) if other medical treatments fail. Accurate identification and resection of parathyroid gland (PTG) tissue is the cornerstone of PTX. The establishment of a rat TPTX model would be beneficial for several applications but faces the same problems. In this experiment, we studied the mechanisms of ischemia for the accurate identification and excision of PTG tissue to establish TPTX rat models and to analyze the effects of surgical removal of PTG tissue as well as the effects of different types of water intake in rats on clinical indices. We found that the ischemia method had advantages when establishing a rat TPTX model. Removal of the PTG tissue resulted in significantly changed postoperative indices, and varying the types of water intake induced significant differences in these indices after removal of the PTG tissue. The absolute value of the difference between the serum calcium and phosphorus concentrations (|Ca-P|) accurately reflected the effect of removal of the PTG tissue and was superior to the calcium-phosphorus product (Ca × P); Ca × P accurately reflected the effect of varying the types of water intake in rats and was superior to the |Ca-P|.
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http://dx.doi.org/10.1538/expanim.17-0029DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5682347PMC
October 2017

Nitrogen-doped carbon dots from plant cytoplasm as selective and sensitive fluorescent probes for detecting p-nitroaniline in both aqueous and soil systems.

Analyst 2015 Mar 29;140(5):1428-31. Epub 2015 Jan 29.

Key laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, China.

Nitrogen-doped carbon dots with excellent water- and ethanol-solubility were facilely prepared from plant cytoplasm via a one-step hydrothermal route and revealed as low-cost, label-free and highly sensitive and selective probes for detecting p-nitroaniline in both aqueous and soils owing to a proposed hydrogen-bonding effect.
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http://dx.doi.org/10.1039/c4an01869aDOI Listing
March 2015

Ornithinibacillus composti sp. nov., isolated from sludge compost and emended description of the genus Ornithinibacillus.

Antonie Van Leeuwenhoek 2015 Mar 7;107(3):813-9. Epub 2015 Jan 7.

Guangdong Institute of Eco-environmental and Soil Sciences, Guangzhou, 510650, People's Republic of China.

A Gram-stain positive, aerobic, motile, endospore-forming and rod-shaped bacterium, designated GSS05(T), was isolated from a sludge compost sample and was characterized by means of a polyphasic taxonomic approach. Growth was observed to occur with 0-3 % (w/v) NaCl (optimum 1 %), at pH 5.5-10 (optimum pH 7.5) and at 15-50 °C (optimum 37 °C). According to the results of a phylogenetic analysis, strain GSS05(T) was found to belong to the genus Ornithinibacillus and to be related most closely to the type strains of Ornithinibacillus halotolerans and Ornithinibacillus contaminans (96.5 and 95.1 % 16S rRNA gene sequence similarity, respectively). The peptidoglycan amino acid type was determined to be A4β. The major respiratory quinone was identified as menaquinone-7 (MK-7). The polar lipid profile of strain GSS05(T) was found to contain a predominance of diphosphatidylglycerol, moderate amounts of phosphatidylglycerol and minor amounts of two unknown phospholipids and two unknown lipids. The G+C content of genomic DNA was determined to be 42.1 mol%. The dominant cellular fatty acids were identified as iso-C15:0 and anteiso-C15:0. The phenotypic, chemotaxonomic, phylogenetic and genotypic data indicated that strain GSS05(T) represents a novel species of the genus Ornithinibacillus, for which the name Ornithinibacillus composti sp. nov. is proposed. The type strain is GSS05(T) (=CCTCC AB 2013261(T) = KCTC 33192(T)).
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http://dx.doi.org/10.1007/s10482-014-0374-2DOI Listing
March 2015

Nonactivated and activated biochar derived from bananas as alternative cathode catalyst in microbial fuel cells.

ScientificWorldJournal 2014 26;2014:832850. Epub 2014 Aug 26.

Guangdong Institute of Eco-Environmental and Soil Sciences, 808 Tianyuan Road, Guangzhou, Guangdong 510650, China.

Nonactivated and activated biochars have been successfully prepared by bananas at different thermotreatment temperatures. The activated biochar generated at 900°C (Biochar-act900) exhibited improved oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) performances in alkaline media, in terms of the onset potential and generated current density. Rotating disk electron result shows that the average of 2.65 electrons per oxygen molecule was transferred during ORR of Biochar-act900. The highest power density of 528.2 mW/m(2) and the maximum stable voltage of 0.47 V were obtained by employing Biochar-act900 as cathode catalyst, which is comparable to the Pt/C cathode. Owning to these advantages, it is expected that the banana-derived biochar cathode can find application in microbial fuel cell systems.
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http://dx.doi.org/10.1155/2014/832850DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4163465PMC
June 2015

Hydrothermal synthesis of nanostructured manganese oxide as cathodic catalyst in a microbial fuel cell fed with leachate.

ScientificWorldJournal 2014 27;2014:791672. Epub 2014 Feb 27.

Guangzhou Division Academy, Chinese Academy of Sciences, Guangzhou 510070, China.

Much effort has been devoted to the synthesis of novel nanostructured MnO2 materials because of their unique properties and potential applications as cathode catalyst in Microbial fuel cell. Hybrid MnO2 nanostructures were fabricated by a simple hydrothermal method in this study. Their crystal structures, morphology, and electrochemical characters were carried out by FESEM, N2-adsorption-desorption, and CV, indicating that the hydrothermally synthesized MnO2 (HSM) was structured by nanorods of high aspect ratio and multivalve nanoflowers and more positive than the naturally synthesized MnO2 (NSM), accompanied by a noticeable increase in oxygen reduction peak current. When the HSM was employed as the cathode catalyst in air-cathode MFC which fed with leachate, a maximum power density of 119.07 mW/m(2) was delivered, 64.68% higher than that with the NSM as cathode catalyst. Furthermore, the HSM via a 4-e pathway, but the NSM via a 2-e pathway in alkaline solution, and as 4-e pathway is a more efficient oxygen reduction reaction, the HSM was more positive than NSM. Our study provides useful information on facile preparation of cost-effective cathodic catalyst in air-cathode MFC for wastewater treatment.
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http://dx.doi.org/10.1155/2014/791672DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3958793PMC
December 2014

Scalable microbial fuel cell (MFC) stack for continuous real wastewater treatment.

Bioresour Technol 2012 Feb 23;106:82-8. Epub 2011 Nov 23.

Guangdong Institute of Eco-environmental and Soil Sciences, Guangzhou 510650, China.

A tubular air-cathode microbial fuel cell (MFC) stack with high scalability and low material cost was constructed and the ability of simultaneous real wastewater treatment and bioelectricity generation was investigated under continuous flow mode. At the two organic loading rates (ORLs) tested (1.2 and 4.9kg COD/m(3)d), five non-Pt MFCs connected in series and parallel circuit modes treating swine wastewater can enable an increase of the voltage and the current. The parallel stack retained high power output and the series connection underwent energy loss due to the substrate cross-conduction effect. With continuous electricity production, the parallel stack achieved 83.8% of COD removal and 90.8% of NH(4)(+)-N removal at 1.2kg COD/m(3)d, and 77.1% COD removal and 80.7% NH(4)(+)-N removal at 4.9kg COD/m(3)d. The MFC stack system in this study was demonstrated to be able to treat real wastewater with the added benefit of harvesting electricity energy.
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http://dx.doi.org/10.1016/j.biortech.2011.11.019DOI Listing
February 2012