147,669 results match your criteria Adsorption Science & Technology[Journal]

Inhibitory action of halogen-free fire retardants on combustion and volatile emission of bituminous components.

Sci Prog 2021 Jul-Sep;104(3):368504211035215

School of Civil Engineering, Nanjing Forestry University, Nanjing, Jiangsu, China.

The objective of this study is to quantitatively evaluate inhibitory action of halogen-free fire retardants (HFR) on combustion properties and volatile emission of such bituminous components as saturates, aromatics, resins, and asphaltenes (SARA). Thermogravimetry-Fourier transform infrared spectroscopy (TG-FTIR) tests were performed on SARA fractions containing matched fire retardants, respectively, and thermal kinetics parameters based on TG curves and functional and structural indices from FTIR spectra were calculated, respectively. The selected fire retardants have not affected the combustion process of SARA fractions, but the combustion temperature intervals are elevated and combustion progresses are retarded. Read More

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Size Dependence Unveiling the Adsorption Interaction of High-Density Lipoprotein Particles with PEGylated Gold Nanoparticles in Biomolecular Corona Formation.

Langmuir 2021 Aug 4. Epub 2021 Aug 4.

Department of Chemistry, Gachon University, Seongnam, Gyeonggi 13120, Republic of Korea.

Apolipoproteins have been often found to be highly enriched in the serum protein coronas produced on various engineered nanoparticles (NPs), which is also known to greatly influence the behaviors of protein corona NPs in the biological systems. As most of the apolipoproteins in blood are associated with lipoproteins, it suggests the active involvement of lipoproteins in the formation of biomolecular coronas on NPs. However, the interactions of lipoprotein complexes with NPs in the corona formation have been rarely understood. Read More

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The Role of Extracellular DNA in Microbial Attachment to Oxidized Silicon Surfaces in the Presence of Ca and Na.

Langmuir 2021 Aug 4. Epub 2021 Aug 4.

Department of Animal and Plant Sciences, The University of Sheffield, Western Bank, Sheffield S10 2TN, U.K.

Attachment assays of a isolate to fused silica slides showed that treatment with DNaseI significantly inhibited cellular adsorption, which was restored upon DNA treatment. These assays confirmed the important role of extracellular DNA (eDNA) adsorption to a surface. To investigate the eDNA adsorption mechanism, single-molecule force spectroscopy (SMFS) was used to measure the adsorption of eDNA to silicon surfaces in the presence of different concentrations of sodium and calcium ions. Read More

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Enzymatic Degradation of Glycosaminoglycans and Proteoglycan-Mimetic Materials in Solution and on Polyelectrolyte Multilayer Surfaces.

Biomacromolecules 2021 Aug 4. Epub 2021 Aug 4.

School of Biomedical Engineering, Colorado State University, Fort Collins, Colorado 80523, United States.

Proteoglycans (PGs) play many important roles in biology, contributing to the mechanical properties of tissues, helping to organize extracellular matrix components, and participating in signaling mechanisms related to mechanotransduction, cell differentiation, immune responses, and wound healing. Our lab has designed two different types of PG mimics: polyelectrolyte complex nanoparticles (PCNs) and PG-mimetic graft copolymers (GCs), both of which are prepared using naturally occurring glycosaminoglycans. This work evaluates the enzymatic stability of these PG mimics using hyaluronidases (I-S, IV-S, and II), chondroitinase ABC, and lysozyme, for PG mimics suspended in solution and adsorbed onto surfaces. Read More

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Xylene Recognition in Flexible Porous Coordination Polymer by Guest-Dependent Structural Transition.

ACS Appl Mater Interfaces 2021 Aug 4. Epub 2021 Aug 4.

Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University Institute for Advanced Study, Kyoto University, Yoshida Ushinomiya-cho, Sakyo-ku, Kyoto 606-8501, Japan.

Xylene isomers are crucial chemical intermediates in great demand worldwide; the almost identical physicochemical properties render their current separation approach energy consuming. In this study, we utilized the soft porous coordination polymer (PCP)'s isomer-specific structural transformation, realizing -xylene (oX) recognition/separation from the binary and ternary isomer mixtures. This PCP has a flexible structure that contains flexible aromatic pendant groups, which both work as recognition sites and induce structural flexibility of the global framework. Read More

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Antifouling and Mechanical Properties of Photografted Zwitterionic Hydrogel Thin-Film Coatings Depend on the Cross-Link Density.

ACS Biomater Sci Eng 2021 Aug 4. Epub 2021 Aug 4.

Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, Iowa 52242, United States.

Zwitterionic polymer networks have shown promise in reducing the short- and long-term inflammatory foreign body response to implanted biomaterials by combining the antifouling properties of zwitterionic polymers with the mechanical stability provided by cross-linking. Cross-link density directly modulates mechanical properties (i.e. Read More

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Band Gap Tuning of Covalent Triazine-based Frameworks through Iron Doping for Visible-light-driven Photocatalytic Hydrogen Evolution.

ChemSusChem 2021 Aug 4. Epub 2021 Aug 4.

Fuzhou University, Environmental Science & Technology, 350108, Fuzhou, CHINA.

Photocatalytic hydrogen energy production through water splitting paves a promising pathway for alleviating the increasingly severe energy crisis. Seeking affordable, highly active and stable photocatalysts is crucial to access the technology in a sustainable manner. Herein, a trivalent iron doped covalent triazine-based framework (CTF-1) was elaborately designed in this study to finely tune the band structure and photocatalytic property of CTF-1 for H2 production. Read More

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Vegetable Oil-Based Waterborne Polyurethane as Eco-Binders for Sulfur Cathodes in Lithium-Sulfur Batteries.

Macromol Rapid Commun 2021 Aug 4:e2100342. Epub 2021 Aug 4.

Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, China.

Lithium sulfur batteries (LSBs) suffer from well-known fast capacity losses despite their extremely high theoretical capacity and energy density. These losses are caused by dissolution of lithium polysulfide (LiPS) in ether-based electrolytes and have become the main bottleneck to widespread applications of LSBs. Therefore, there is a significant need for electrode materials that have a strong adsorption capacity for LiPS. Read More

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Dopamine-polyethyleneimine co-deposition of a capillary for α-Glucosidase immobilization and its application in enzyme inhibitor screening.

Electrophoresis 2021 Aug 4. Epub 2021 Aug 4.

School of Pharmacy, Lanzhou University, Lanzhou, 730000, P. R. China.

An on-line method based on capillary electrophoresis was established to screen α-glucosidase inhibitors from traditional Tibetan medicine (TTM) extracts. Firstly, the inner wall at the inlet of capillary column was simply and effectively functionalized by dopamine-polyethyleneimine co-deposition method, which combines the adhesion property of dopamine and easy cationization of polyethyleneimine. Then α-glucosidase was rapidly immobilized on the inner wall of the capillary column by electrostatic adsorption. Read More

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Probing the Bovine Hemoglobin Adsorption Process and its Influence on Interfacial Water Structure at the Air-Water Interface.

Appl Spectrosc 2021 Aug 4:37028211035157. Epub 2021 Aug 4.

Department of Physics, Indian Institute of Technology Ropar, Rupnagar, India.

*These authors contributed equally to this work.The molecular-level insight of protein adsorption and its kinetics at interfaces is crucial because of its multifold role in diverse fundamental biological processes and applications. In the present study, the sum frequency generation (SFG) vibrational spectroscopy has been employed to demonstrate the adsorption process of bovine hemoglobin (BHb) protein molecules at the air-water interface at interfacial isoelectric point of the protein. Read More

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Highly Active CuO/SiO Dot Core/Rod Shell Catalysts with Enhanced Stability for the Reverse Water Gas Shift Reaction.

ACS Appl Mater Interfaces 2021 Aug 4. Epub 2021 Aug 4.

Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States.

Cu-based catalysts are highly active and selective for several CO conversion reactions; however, traditional monometallic Cu-based catalysts suffer poor thermal stability due to the aggregation of copper particles at high temperatures. In this work, we demonstrate a crystal engineering strategy to controllably prepare copper/silica (CuO/SiO) catalysts for the reverse water gas shift reaction (RWGS) at high temperatures. We show that CuO/SiO catalysts derived from the reduction of pure copper silicate nanotubes in a CO and H atmosphere exhibit superior catalytic activity with enhanced stability compared to traditional monometallic Cu-based catalysts for the RWGS at high temperatures. Read More

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Simulating drug concentrations in PDMS microfluidic organ chips.

Lab Chip 2021 Aug 4. Epub 2021 Aug 4.

Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA. and Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA and Vascular Biology Program and Department of Surgery, Harvard Medical School and Boston Children's Hospital, Boston, MA 02115, USA.

Microfluidic organ-on-a-chip (Organ Chip) cell culture devices are often fabricated using polydimethylsiloxane (PDMS) because it is biocompatible, transparent, elastomeric, and oxygen permeable; however, hydrophobic small molecules can absorb to PDMS, which makes it challenging to predict drug responses. Here, we describe a combined simulation and experimental approach to predict the spatial and temporal concentration profile of a drug under continuous dosing in a PDMS Organ Chip containing two parallel channels separated by a porous membrane that is lined with cultured cells, without prior knowledge of its log P value. First, a three-dimensional finite element model of drug loss into the chip was developed that incorporates absorption, adsorption, convection, and diffusion, which simulates changes in drug levels over time and space as a function of potential PDMS diffusion coefficients and log P values. Read More

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Induced half-metallic characteristics and enhanced magnetic anisotropy in the two-dimensional Janus VIBr monolayer by graphyne adsorption.

Phys Chem Chem Phys 2021 Aug 4. Epub 2021 Aug 4.

Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, School of Science, Tianjin University, Tianjin 300354, China.

The recent emergence of two-dimensional (2D) Janus materials has opened a new avenue for spintronic and optoelectronic applications. However, 2D magnetic Janus materials and Janus monolayer-based magnetic heterostructures are yet to be fully studied. Herein, the stability and electronic structure of 2D Janus V2I3Br3 and V2I3Cl3 monolayers, and the electronic and magnetic properties of 2D graphyne/Janus V2I3Br3 (γ-GY/V2I3Br3) heterostructures are calculated based on the density functional theory. Read More

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Oxygen adsorption on high-index faceted Pt nanoparticles.

Phys Chem Chem Phys 2021 Aug 4. Epub 2021 Aug 4.

Department of Physics, Xiamen University, Xiamen 361005, China.

High-index faceted Pt nanoparticles with excellent electrocatalytic performances are promising to efficiently accelerate the oxygen reduction reactions in fuel cells. By adopting the hybrid grand canonical Monte Carlo reactive molecular dynamics (GCMC/RMD) simulations, we examined the oxygen adsorption on three 24-facet nanoparticles respectively enclosed by {310}, {311}, and {331} high-index facets. The site-dependent adsorption energies on each open-structure surface are calculated. Read More

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Efficacy of an organically modified bentonite to adsorb 2,4-dichlorophenoxyacetic acid (2,4-D) and prevent its phytotoxicity.

J Environ Manage 2021 Jul 31;297:113427. Epub 2021 Jul 31.

Instituto de Investigaciones Biológicas (IIB). UE CONICET-UNMDP, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata (UNMDP) y Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Deán Funes, 3250, (7600), Mar del Plata, Argentina.

The herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) is widely used due to it selective action, and preferential control of dicotyledonous weeds affecting cereal crops. Physiological responses of sensitive dicotyledonous plants to 2,4-D include growth retardation, senescence, and cell death. Due to soil and water contamination by agricultural practices, 2,4-D constitutes a potential risk to non-target plant species. Read More

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Salicylic acid reduces cadmium (Cd) accumulation in rice (Oryza sativa L.) by regulating root cell wall composition via nitric oxide signaling.

Sci Total Environ 2021 Jul 21;797:149202. Epub 2021 Jul 21.

Rice Product Quality Supervision and Inspection Center, China National Rice Research Institute, Hangzhou 310006, PR China. Electronic address:

The effects of salicylic acid (SA) on cadmium (Cd) accumulation, Cd subcellular distribution, cell wall composition and Cd adsorption in Cd-stressed rice seedlings were examined. The interaction between SA and nitric oxide (NO) signaling in regulating cell wall composition under Cd exposure was also investigated. Our results showed that 5 μmol·L Cd treatment significantly decreased plant height, root length and plant dry weight by 40. Read More

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Hydrous titanium oxide and bayberry tannin co-immobilized nano collagen fibrils for uranium extraction from seawater and recovery from nuclear wastewater.

Chemosphere 2021 Jul 23;286(Pt 1):131626. Epub 2021 Jul 23.

State Key Laboratory of Environment-friendly Energy Materials, School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, PR China; Engineering Research Center of Biomass Materials, Ministry of Education, National Collaborative Innovation Center for Nuclear Waste Disposal and Environmental Safety, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, PR China. Electronic address:

Extraction uranium from complicated aqueous solutions (seawater and nuclear wastewater) has been promoting the development of multi-functional adsorbents with high adsorption capacities and high selectivity. Here, we proposed a co-immobilization approach to preparing uranium adsorbents. Due to specific recognition and binding between functional groups, bayberry tannin (BT) and hydrous titanium oxide (HTO) were co-immobilized onto nano collagen fibrils (NCFs). Read More

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Synthesis and characterization of polyphenols functionalized graphitic hematite nanocomposite adsorbent from an agro waste and its application for removal of Cs from aqueous solution.

Chemosphere 2021 Jul 9;286(Pt 1):131493. Epub 2021 Jul 9.

Center for Environmental Nuclear Research, Directorate of Research and Virtual Education, SRM Institute of Science and Technology, SRM Nagar, Kattankulathur, 603203, Kanchipuram, Chennai, Tamil Nadu, India. Electronic address:

In this study, Polyphenols functionalized Graphitic Hematite Nanocomposite (PGHN) was used as an adsorbent to remove Caesium (Cs) ions from a simulated solution. The nanocomposite was produced by synthesizing iron oxide nanoparticles using orange peel extract (OPE) as the reducing and capping agent in the presence of graphite produced from sugarcane bagasse. The nanocomposite exhibited a scaly morphology and the mean particle size of rhombohedral structured hematite nanoparticles was found to be 148. Read More

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Why is calcite a strong phosphorus sink in freshwater? Investigating the adsorption mechanism using batch experiments and surface complexation modeling.

Chemosphere 2021 Jul 21;286(Pt 1):131596. Epub 2021 Jul 21.

School of Geosciences, University of South Florida, 4202 E. Fowler Ave, Tampa, FL, 33620, United States.

One of the primary drivers of Phosphorus (P) limitation in aquatic systems is P adsorption to sediments. Sediments adsorb more P in freshwater compared to other natural solutions, but the mechanism driving this difference is poorly understood. To provide insights into the mechanism, we conducted batch experiments of P adsorption to calcite in freshwater and seawater, and used computer software to develop complexation models. Read More

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Double-Walled Metal-Organic Framework with Regulable Pore Environments for Efficient Removal of Radioactive Cesium Cations.

Inorg Chem 2021 Aug 4. Epub 2021 Aug 4.

School of Materials Science and Engineering, Tianjin Key Laboratory of Metal and Molecule-Based Material Chemistry, Nankai University, Tianjin 300350, China.

An anion double-walled metal-organic framework [CoLi(BTC)(DMF)(HO)·(CH)N] () based on heterobimetallic Li and Co ions was successfully constructed. Utilizing selective destruction and formation of Co-O/Co-N bonds in the metal chains, [CoLi(BTC)(py)(HO)·(CH)N] () and [CoLi(BTC)(pi)(HO)·(CH)N] () with the same skeleton but distinct pore structures can be surprisingly obtained. Additionally, compounds and can be transformed into [CoLi(BTC)(HO)·(CH)N] () by soaking them in an ethanol solution. Read More

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Highly efficient CO2 electroreduction to methanol via atomically dispersed Sn coupled with defective CuO catalysts.

Angew Chem Int Ed Engl 2021 Aug 3. Epub 2021 Aug 3.

Institute of Chemistry Chinese Academy of Sciences, CAS Key Laboratory of Colloid and Interface and Thermodynamics, CHINA.

Using renewable electricity to drive CO 2 electroreduction is an attractive way to achieve carbon-neutral energy cycle and produce value-added chemicals and fuels. As an important platform molecule and clean fuel, methanol requires 6-electron transfer in the process of CO 2 reduction. Currently, CO 2 electroreduction to methanol suffers from poor efficiency and low selectivity. Read More

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Construction of a Porous Metal-Organic Framework with a High Density of Open Cr Sites for Record N /O Separation.

Adv Mater 2021 Aug 4:e2100866. Epub 2021 Aug 4.

College of Chemistry and Chemical Engineering, Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, P. R. China.

The removal of low concentration N is of great significance and challenging in the industrial production of high-purity O . Herein, a chromium-based metal-organic framework, namely, TYUT-96Cr, is reported, which has an unprecedented N capture capacity of 37.46 cm cm and N /O (5:95, v/v) selectivity up to 26. Read More

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Green synthesis of a novel functionalized chitosan adsorbent for Cu(II) adsorption from aqueous solution.

Environ Sci Pollut Res Int 2021 Aug 3. Epub 2021 Aug 3.

Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, Yunnan, China.

Pollution generated by heavy metals has become a global environmental issue with much public concern. Herein, a functionalized chitosan-based adsorbent (CS-PAR) was synthesized via a simple one-step method for the adsorption of copper ions in solutions. A series of characterization methods have shown that CS-PAR was successfully synthesized. Read More

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evaluation of binding capacity of different binders to adsorb aflatoxin.

Vet Res Forum 2021 15;12(2):211-215. Epub 2021 Jun 15.

Department of Animal and Poultry Sciences, College of Abouraihan, University of Tehran, Iran.

This study was conducted to compare the efficacy of different feed additives as mycotoxin binders . Four prevalent aflatoxin-sequestering agents (SAs) including two bentonite clays (common and acid activated bentonite), a yeast cell wall product and an activated charcoal product were evaluated to verify their capacity for binding aflatoxin B1 (AFB1). The SAs were individually mixed at two different ratios with AFB1 (1:70,000, 1:120,000) and their binding capacity indices were determined. Read More

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Storage and Pre-Neutron Activation Analysis Treatment for Trace Element Analysis in Urine.

J Res Natl Bur Stand (1977) 1986 Mar-Apr;91(2):93-102

University of Nebraska-Lincoln, NE 68588.

The problems regarding storage and pre-neutron activation analysis treatment for the elements aluminum, calcium, vanadium, selenium, copper, iodine, zinc, manganese, and magnesium in a urine matrix are reviewed. The type of collection and storage procedure and pre-neutron activation analysis treatment of mine depend on the specific trace element; that is, its inherent physical and chemical properties. Specifically polyethylene in teflon containers are the most suitable for general determinations. Read More

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Towards estimation of CO adsorption on highly porous MOF-based adsorbents using gaussian process regression approach.

Sci Rep 2021 Aug 3;11(1):15710. Epub 2021 Aug 3.

College of Engineering and Technology, American University of the Middle East, Egaila, Kuwait.

In recent years, new developments in controlling greenhouse gas emissions have been implemented to address the global climate conservation concern. Indeed, the earth's average temperature is being increased mainly due to burning fossil fuels, explicitly releasing high amounts of CO into the atmosphere. Therefore, effective capture techniques are needed to reduce the concentration of CO. Read More

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Storage Mechanism of Alkali Metal Ions in the Hard Carbon Anode: an Electrochemical Viewpoint.

ACS Appl Mater Interfaces 2021 Aug 3. Epub 2021 Aug 3.

School of Materials Science and Engineering, Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), and Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300072, China.

The storage mechanisms of Li, Na, and K in hard carbon anodes are investigated through systematically exploring their electrochemical behaviors. Two charge/discharge voltage regions are observed for all the Li, Na, and K storage, a slope at a high voltage, and a plateau in a low-voltage range. Considerably different behaviors are revealed by the galvanostatic intermittent titration technique and electrochemical impedance spectroscopy measurements, and accordingly different storage mechanisms are proposed. Read More

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Investigation of the Physical Properties and Clinical Application of Embosphere Microspheres.

Chemotherapy 2021 Aug 3:1-17. Epub 2021 Aug 3.

Department of Interventional Radiology, Panzhihua Central Hospital, Panzhihua, China.

Background: The aim of this study was to understand physical characteristics of Embosphere microspheres for the clinical use of microsphere chemotherapy embolization of liver cancer.

Methods: The morphology of Embosphere microspheres in different states, including static, oscillating, and in a magnetic field was observed with the naked eye. Ninety-five patients diagnosed with primary hepatocellular carcinoma (HCC) were separated into 3 groups based on the types of embolic material as follows: 32 cases of sole microspheres, 34 cases of iodinated oil (17 cases with additional application of gelatin sponge particle), and 29 cases of iodinated oil + Embosphere microspheres. Read More

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Covalent organic frameworks-based smart materials for mitigation of pharmaceutical pollutants from aqueous solution.

Chemosphere 2021 Jul 29;286(Pt 2):131710. Epub 2021 Jul 29.

Tecnologico de Monterrey, School of Engineering and Sciences, Monterrey, 64849, Mexico. Electronic address:

Covalent organic frameworks (COFs) are an emergent group of crystalline porous materials that have gained incredible interest in recent years. With foreseeable controllable functionalities and structural configurations, the constructions and catalytic properties of these organic polymeric materials can be controlled to fabricate targeted materials. The specified monomer linkers and pre-designed architecture of COFs facilitate the post-synthetic modifications for introducing novel functions and useful properties. Read More

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Facile synthesis of uniform spherical covalent organic frameworks for determination of neonicotinoid insecticides.

Food Chem 2021 Jul 21;367:130653. Epub 2021 Jul 21.

Department of Food Science, College of Food Science and Technology, Hebei Agricultural University, Baoding 071001, China; Department of Chemistry, College of Science, Hebei Agricultural University, Baoding 071001, China. Electronic address:

A uniform spherical structure covalent organic framework (TAPA-BPDA-COF) was prepared by a facile method at room temperature with tris(4-aminophenyl)amine (TAPA) and 4,4'-biphenyldicarboxaldehyde (BPDA) as building blocks. Based on the solid phase extraction with the TAPA-BPDA-COF as the sorbent and high performance liquid chromatography-diode array detection, a sensitive analytical method was established for the determination of four neonicotinoid insecticides from water and honey samples. Under the optimum conditions, good linear response for the quantification of the analytes was achieved in the range of 0. Read More

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