61 results match your criteria modified hydrotalcite

3D Flower-like NiCo Layered Double Hydroxides: An Efficient Electrocatalyst for Non-Enzymatic Electrochemical Biosensing of Hydrogen Peroxide in Live Cells and Glucose in Biofluids.

ACS Appl Bio Mater 2021 Apr 18;4(4):3203-3213. Epub 2021 Mar 18.

Department of Nuclear Medicine and Molecular Imaging Center, Chang Gung Memorial Hospital, Taoyuan 33305, Taiwan, ROC.

Herein, a hierarchical structure of flower-like NiCo layered double hydroxides (NiCo LDH) microspheres composed of three-dimensional (3D) ultrathin nanosheets was successfully synthesized via a facile hydrothermal approach. The formation of NiCo LDH was confirmed by various physicochemical studies, and the NiCo LDH-modified glassy carbon electrode was used as an efficient dual-functional electrocatalyst for non-enzymatic glucose and hydrogen peroxide (HO) biosensor. The host matrix of hydrotalcite NiCo LDH exhibits the enhanced electrocatalytic sensing performances with a quick response time (<3 s), wide linear range (50 nM-18. Read More

View Article and Full-Text PDF

X-ray Photoelectron Spectroscopic Study of Some Organic and Inorganic Modified Clay Minerals.

Materials (Basel) 2021 Nov 23;14(23). Epub 2021 Nov 23.

Department of Chemistry, College of Arts and Sciences, University of the Philippines Visayas, Miagao, Iloilo 5023, Philippines.

Layered clay systems intercalated with inorganic and organic compounds were analyzed to highlight how XPS can provide information on the different environments surrounding a particular atom as well as provide discernments on the size, coordination, and structural and oxidative transformations of the intercalating/pillaring compounds. XPS data on the intercalation of urea and K-acetate in low- and high-defect kaolinite revealed the interaction of the intercalating group NH with the siloxane functional groups in the interlayer surface. The intercalation of HDTMA in Mt demonstrated the use of XPS in monitoring the change in conformation assumed by alkylammonium intercalating compounds in Mt with increasing CEC. Read More

View Article and Full-Text PDF
November 2021

Soil modification with organic amendments and organo-clays: Effects on sorption, degradation, and bioactivity of the allelochemical scopoletin.

J Environ Manage 2022 Jan 17;302(Pt B):114102. Epub 2021 Nov 17.

Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS), CSIC, Avenida Reina Mercedes 10, 41012, Seville, Spain.

We assessed the effect of three organic amendments and two organo-clays on sorption, persistence, and phytotoxicity of scopoletin, an allelochemical compound with potential as bioherbicide, in a Mediterranean alkaline soil. The aim was to elucidate whether the phytotoxicity of scopoletin could be expressed better in amended than unamended soil. The three organic amendments were fresh solid olive-mill waste (OMW), composted solid olive-mill waste (OMWc), and biochar (BC) prepared from OMWc. Read More

View Article and Full-Text PDF
January 2022

Coating layered double hydroxides with carbon dots for highly efficient removal of multiple dyes.

J Hazard Mater 2022 Feb 29;424(Pt C):127613. Epub 2021 Oct 29.

Department of Analytical Chemistry, Jilin Institute of Chemical Technology, No. 45 Chengde Street, Jilin 132022, PR China. Electronic address:

Layered double hydroxides (LDHs) and layered double oxides (LDOs) are desirable adsorption materials for printing and wastewater treatment owing to their outstanding anion exchange abilities, abundant active sites, and eco-friendly nature. In this study, a versatile LDO hybrid coated with carbon dots ([email protected]) was constructed by modifying sodium dodecylbenzene sulfonate on the surface of MgAl-LDH as a carbon precursor, followed by ligand carbonization and hydrotalcite dehydration at 450 °C under N flow. [email protected] displayed a hexagonal lamellar architecture with a plate lateral size of approximately 500 nm. Read More

View Article and Full-Text PDF
February 2022

High-performance hydrophobic magnetic hydrotalcite for selective treatment of oily wastewater.

Environ Technol 2021 Nov 29:1-12. Epub 2021 Nov 29.

Department of Chemical and Food Engineering, Federal University of Santa Catarina, Florianópolis, Brazil.

Oil emulsified in water is one of the most difficult mixtures to treat due to the good stability of emulsions, so there is a growing demand for more efficient methods for separating immiscible oil/water mixtures. In this context, the focus of this study was to obtain an adsorbent for the selective treatment of a simulated oily wastewater. To this aim, a modified hydrotalcite sample with hydrophobic and magnetic characteristics was prepared and characterized. Read More

View Article and Full-Text PDF
November 2021

Enhanced adsorption properties of organic ZnCr-LDH synthesized by soft template method for anionic dyes.

Environ Sci Pollut Res Int 2021 Sep 27;28(35):48236-48252. Epub 2021 Apr 27.

School of Chemistry and Chemical Engineering, Henan Key Laboratory of Coal Green Conversion, Henan Polytechnic University, Jiaozuo, 454000, China.

Organic ZnCr-LDH (ST-LDH) was synthesized by a facile one-step hydrothermal technique using methyl orange (MO) as a soft template agent, which can efficiently remove methyl orange (MO), Congo red (CR), and orange II (OII) from aqueous solution. The microstructure of ST-LDH by modifying changed obviously, from the cellular structure to the stacking structure formed by the face-face contact of hydrotalcite nanosheets, which resulted in much more exchangeable nitrate ions to remain in the interlayer space. The pre-insertion of benzene sulfonate as a pillar expanded the interlayer gallery, which facilitated the pollutant anions (MO, CR, and OII) into the interlayer of LDH in the subsequent adsorption process. Read More

View Article and Full-Text PDF
September 2021

Poly(Methyl Methacrylate) Coatings Containing Flame Retardant Additives from Suspensions in Water-2-Propanol.

Molecules 2021 Mar 31;26(7). Epub 2021 Mar 31.

Department of Materials Science and Engineering, McMaster University, Hamilton, ON L8S4L7, Canada.

A dip-coating technique is designed for deposition of poly(methyl methacrylate) (PMMA) from water/2-propanol mixture, avoiding the use of traditional toxic solvents. Solutions of PMMA macromolecules with high molecular weight (M) are obtained for a water/2-propanol ratio of 0.15-0. Read More

View Article and Full-Text PDF

Removal of Chlorine Ions from Desulfurization Wastewater by Modified Fly Ash Hydrotalcite.

ACS Omega 2020 Dec 4;5(49):31665-31672. Epub 2020 Dec 4.

Department of Environmental Science and Engineering, North China Electric Power University-Baoding Campus, Baoding 071003, P. R. China.

The effective removal of chlorine ion from the desulfurization slurry is of great significance to the stable operation of the desulfurization system. Modified fly ash hydrotalcites were prepared by alkali/acid-combined roasting and microwaving and used as an adsorbent for chlorine ion in desulfurized wastewater. The specific surface area and porosity of different adsorbents were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Read More

View Article and Full-Text PDF
December 2020

Production of Aromatic Compounds by Catalytic Depolymerization of Technical and Downstream Biorefinery Lignins.

Biomolecules 2020 09 18;10(9). Epub 2020 Sep 18.

Institute for Advanced Materials and Mathematics (InaMat2) and Department of Sciences, Universidad Pública de Navarra, E31006 Pamplona, Spain.

Lignocellulosic materials are promising alternatives to non-renewable fossil sources when producing aromatic compounds. Lignins from . and from industrial wastes and biorefinery effluents were isolated and characterized. Read More

View Article and Full-Text PDF
September 2020

Polyelectrolyte nanocomposite hydrogels filled with cationic and anionic clays.

Carbohydr Polym 2020 Mar 2;232:115824. Epub 2020 Jan 2.

Departamento de Polímeros, Facultad de Ciencias Químicas, Universidad de Concepción, Concepción, Chile. Electronic address:

Polyelectrolyte nanocomposite hydrogels (NHGs) were synthesized. NHGs were formed from a polymer matrix composed of a cationic, anionic, and alkylated chitosan polymer modified with vinyl groups (ChAV) to achieve greater crosslinking. Cationic and anionic clays montmorillonite and hydrotalcite, respectively, were used as nanofillers to introduce electrostatic interaction with the matrix. Read More

View Article and Full-Text PDF

Exfoliated hydrotalcite-modified polyethersulfone-based nanofiltration membranes for removal of lead from aqueous solutions.

Environ Sci Pollut Res Int 2020 Aug 19;27(24):29725-29736. Epub 2019 Nov 19.

Department of Chemical Engineering, National Institute of Technology Calicut, Kozhikode, 673601, India.

In recent years, the volume of wastewater produced worldwide has led to an increase in the study and use of different membranes and their properties. The progress of membrane technology in hand with nanotechnology has brought to the establishment of advanced membrane materials that are effective in the field of wastewater treatment and water reclamation. This study focuses on the effectiveness of exfoliated hydrotalcite (EHT) nanosheets in the membrane structure which has been evaluated by water flux and heavy metal rejection studies from aqueous solutions. Read More

View Article and Full-Text PDF

Synthesis and Characterization of New Layered Double Hydroxide-Polyolefin Film Nanocomposites with Special Optical Properties.

Materials (Basel) 2019 Oct 31;12(21). Epub 2019 Oct 31.

Departamento de Ingeniería Mecánica, Materiales y Fabricación. Universidad Politécnica de Cartagena, 30202 Cartagena, Spain.

In this study, we have synthesized new double layered hydroxides to be incorporated to low density polyethylene thermoplastic matrix. These new composites present promising applications as materials to build greenhouses due to the enhancement of their optical properties. A characterization of the modified nanoclay has been performed by means of X-ray fluorescence (XRF), X-ray Diffraction (XRD), Thermogravimetric analysis (TGA), and Fourier-transform infrared spectroscopy (FTIR). Read More

View Article and Full-Text PDF
October 2019

Arsenic removal from groundwater in Kütahya, Turkey, by novel calcined modified hydrotalcite.

Environ Geochem Health 2020 May 13;42(5):1335-1345. Epub 2019 Sep 13.

Department of Mining Engineering, Karadeniz Technical University, 61080, Trabzon, Turkey.

Since arsenic is highly toxic and carcinogenic, it now causes serious health problems all over the world. Therefore, there is an urgent need to develop new techniques that are cost-effective and easily applicable to remove arsenic from contaminated waters. Layer double hydroxides have the potential to be a good adsorbent to remove arsenic from contaminated waters due to high surface area and high anion exchange capacity. Read More

View Article and Full-Text PDF

Oxidative Dehydrogenation of Ethanol over Vanadium- and Molybdenum-modified Mg-Al Mixed Oxide Derived from Hydrotalcite.

J Oleo Sci 2019 Jul 10;68(7):679-687. Epub 2019 Jun 10.

Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University.

Hydrotalcite or Mg-Al LDHs were synthesized by co-precipitation method. The Mg-Al mixed oxide was then derived by calcination of hydrotalcite at 450°C. The metal modified catalysts (Mo/Mg-Al and V/Mg-Al) were prepared by incipient wetness impregnation method. Read More

View Article and Full-Text PDF

Relaxation Dynamics in Polyethylene Glycol/Modified Hydrotalcite Nanocomposites.

Polymers (Basel) 2018 Oct 24;10(11). Epub 2018 Oct 24.

Department of Applied Science and Technology and Local INSTM Unit, Politecnico di Torino, Viale T. Michel 5, 15121 Alessandria, Italy.

Polyethylene glycol-based nanocomposites containing an organo-modified hydrotalcite with loadings ranging from 0.5 to 5 wt.% were prepared by melt mixing performed just above the melting point of the polymer matrix. Read More

View Article and Full-Text PDF
October 2018

Functionalized Porous Silica-Based Nano/Micro Particles for Environmental Remediation of Hazard Ions.

Nanomaterials (Basel) 2019 Feb 12;9(2). Epub 2019 Feb 12.

School of Resources, Environment and Materials, Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured Materials, Guangxi University, Nanning 530004, China.

The adsorption and separation of hazard metal ions, radioactive nuclides, or minor actinides from wastewater and high-level radioactive waste liquids using functional silica-based nano/micro-particles modified with various inorganic materials or organic groups, has attracted significant attention since the discovery of ordered mesoporous silica-based substrates. Focusing on inorganic and organic modified materials, the synthesis methods and sorption performances for specific ions in aqueous solutions are summarized in this review. Three modification methods for silica-based particles, the direct synthesis method, wetness impregnation method, and layer-by-layer (LBL) deposition, are usually adopted to load inorganic material onto silica-based particles, while the wetness impregnation method is currently used for the preparation of functional silica-based particles modified with organic groups. Read More

View Article and Full-Text PDF
February 2019

Enhanced catalytic performance for VOCs oxidation on the CoAlO oxides by KMnO doped on facile synthesis.

Chemosphere 2019 Mar 23;218:895-906. Epub 2018 Nov 23.

Tianjin Key Lab of Indoor Air Environmental Quality Control, School of Environmental Science and Technology, Tianjin University, Tianjin, 300350, China.

The MnO was immobilized on the CoAl mixed oxides (CoAlO) derived from hydrotalcites with various anions (CO, Cl, NO and SO) using the hydration and impregnation methods. The CoAlO oxides modified by KMnO were calcined in air at 300 °C to obtain stable oxides, which could be used as catalysts for VOCs (acetone and ethyl acetate) oxidation. CoAlO with CO and 30 h of hydration time (CoAlO-C-Mn-30) exhibited a promising catalytic activity (T = 173 °C for acetone oxidation; T = 175 °C for ethyl acetate), highly superior to CoAlO without KMnO modification. Read More

View Article and Full-Text PDF

Optimization of CO adsorption capacity and cyclical adsorption/desorption on tetraethylenepentamine-supported surface-modified hydrotalcite.

J Environ Sci (China) 2018 Mar 2;65:293-305. Epub 2017 Mar 2.

Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, Bangkok 10330, Thailand. Electronic address:

The objective of this research was to investigate CO adsorption capacity of tetraethylenepentamine-functionalized basic-modified calcined hydrotalcite (TEPA/b-cHT) sorbents at atmospheric pressure formed under varying TEPA loading levels, temperatures, sorbent weight to total gaseous flow rate (W/F) ratios and CO concentrations in the influent gas. The TEPA/b-cHT sorbents were characterized by means of X-ray diffraction (XRD), Fourier transform infrared spectrometry (FT-IR), thermal gravimetric analysis (TGA), Brunauer-Emmet-Teller (BET) analysis of nitrogen (N) adsorption/desorption and carbon-hydrogen-nitrogen (CHN) elemental analysis. Moreover, a full 2 factorial design with three central points at a 95% confidence interval was used to screen important factor(s) on the CO adsorption capacity. Read More

View Article and Full-Text PDF

Heterogeneous photocatalysis using TiO modified with hydrotalcite and iron oxide under UV-visible irradiation for color and toxicity reduction in secondary textile mill effluent.

J Environ Manage 2018 Apr 4;211:154-163. Epub 2018 Feb 4.

Department of Civil Engineering, Universidade Federal de Viçosa, Av. P.H. Rolfs, s/n, 36570-900 Viçosa, MG, Brazil.

The objective of this study was to evaluate ADMI color removal from a biologically treated textile mill effluent by heterogeneous photocatalysis with UV-visible irradiation (UV-vis) using a novel catalyst composed of TiO supported on hydrotalcite and doped with iron oxide (HT/Fe/TiO). Simulated biological treatment of solutions of the dyes (50 mg/L) used in the greatest amounts at the mill where the textile effluent was collected resulted in no color removal in reactive dye solutions and about 50% color removal in vat dye solutions, after 96 h, indicating that the secondary effluent still contained a large proportion of anionic reactive dyes. Photocatalytic treatments were carried out with TiO and HT/Fe/TiO of Fe:Ti molar ratios of 0. Read More

View Article and Full-Text PDF

Dual chain extension effect and antibacterial properties of biomolecules interleaved within LDH dispersed into PBS by in situ polymerization.

Dalton Trans 2018 Feb;47(9):3155-3165

Dipartimento di Ingegneria Civile, Chimica, Ambientale e dei Materiali, Università di Bologna, Via Terracini 28, 40131 Bologna, Italy.

Nanocomposites based on poly(butylene succinate) (PBS) and hydrotalcite-type anionic clays (HTs) organo-modified with biomolecules characterized by antibacterial and/or antioxidant activities, such as l-ascorbic acid (ASA), phloretic acid (HPP), l-tyrosine (TYR) and l-tryptophan (TRP), have been prepared by in situ polymerization. From XRD analysis and rheology experiments in a molten polymer state, intercalated HT hybrid platelets acting here as a hybrid filler are found to be well dispersed into polymers while providing a chain extension effect on PBS. Moreover, the molecules, when hosted within a HT interlayer gap, do preserve their pristine antibacterial activity, both in HT and in the resulting PBS composites. Read More

View Article and Full-Text PDF
February 2018

Ionic Liquid as Surfactant Agent of Hydrotalcite: Influence on the Final Properties of Polycaprolactone Matrix.

Polymers (Basel) 2018 Jan 5;10(1). Epub 2018 Jan 5.

Department of Industrial Engineering, University of Salerno-via Giovanni Paolo II, 132, 84084 Fisciano (Salerno), Italy.

This paper reports the surface treatment of layered double hydroxide (LDH) by using ionic liquid (IL) composed of phosphonium cation combined with 2-ethylhexanoate (EHT) counter anion as surfactant agent. Then, different amounts (1, 3, 5 and 7 wt %) of thermally stable organically modified LDH (up to 350 °C) denoted LDH-EHT were incorporated into polycaprolactone (PCL) matrix by mechanical milling. The influence of LDH-EHT loading has been investigated on the physical properties, such as the thermal and barrier properties, as well as the morphologies of the resulting nanocomposites. Read More

View Article and Full-Text PDF
January 2018

Impact of Soot on NO Adsorption over Cu-Modified Hydrotalcite-Derived Lean NO Trap Catalyst.

Langmuir 2017 03 14;33(12):2939-2948. Epub 2017 Mar 14.

State Key Laboratory of Engines, Tianjin University , Tianjin 300072, People's Republic of China.

The impact of soot on NO adsorption was studied over a Cu-modified hydrotalcite-derived lean NO trap catalyst in a NO + O atmosphere. Powder X-ray diffraction, scanning electron microscopy, Raman scattering spectroscopy, and X-ray photoelectron spectroscopy were used to characterize the surface properties of the pure catalyst and the soot/catalyst mixture. The adsorbed NO species on the samples were evaluated by in situ diffuse reflectance Fourier transform spectroscopy. Read More

View Article and Full-Text PDF

Direct Synthesis of Renewable Dodecanol and Dodecane with Methyl Isobutyl Ketone over Dual-Bed Catalyst Systems.

ChemSusChem 2017 03 18;10(5):825-829. Epub 2017 Jan 18.

State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P.R. China.

For the first time, we demonstrated two integrated processes for the direct synthesis of dodecanol or 2,4,8-trimethylnonane (a jet fuel range C -branched alkane) using methyl isobutyl ketone (MIBK) that can be derived from lignocellulose. The reactions were carried out in dual-bed continuous flow reactors. In the first bed, MIBK was selectively converted to a mixture of C alcohol and ketone. Read More

View Article and Full-Text PDF

Flower-like Cobalt Hydroxide/Oxide on Graphitic Carbon Nitride for Visible-Light-Driven Water Oxidation.

ACS Appl Mater Interfaces 2016 Dec 15;8(51):35203-35212. Epub 2016 Dec 15.

Department of Chemical Engineering and CRC for Contamination Assessment and Remediation of the Environment (CRC CARE), Curtin University , GPO Box U1987, Bentley, Western Australia 6102, Australia.

Direct water oxidation via photocatalysis is a four-electron and multiple-proton process which requires high extra energy input to produce free dioxygen gas, making it exacting, especially under visible light irradiation. To improve the oxygen evolution reaction rates (OERs) and utilize more visible light, flower-like cobalt hydroxide/oxide (Fw-Co(OH)/Fw-CoO) photocatalysts were prepared and loaded onto graphitic carbon nitride (g-CN) by a facile coating method in this work. Influenced by the unique three-dimensional morphologies, the synthesized Fw-Co(OH) or Fw-CoO/g-CN hybrids reveal favorable combination and synergism reflected by the modified photoelectric activities and the improved OER performances. Read More

View Article and Full-Text PDF
December 2016

Organo/Zn-Al LDH Nanocomposites for Cationic Dye Removal from Aqueous Media.

Nanoscale Res Lett 2016 Dec 27;11(1):228. Epub 2016 Apr 27.

Chuiko Institute of Surface Chemistry of the National Academy of Sciences of Ukraine, 17 General Naumov Str., Kyiv, 03164, Ukraine.

Cationic dye sorption by Zn-Al-layered double hydroxides (LDHs) modified with anionic surfactants was examined using methylene blue (MB) dye as a compound model in aqueous solutions. The modification of Zn-Al LDHs was performed by reconstruction method using dodecyl sulfate anion (DS) solutions. DS contained Zn-Al LDHs were characterized by XRD, FTIR, thermogravimetric, and SEM analysis. Read More

View Article and Full-Text PDF
December 2016

Real-time tracking of hydrogen peroxide secreted by live cells using MnO2 nanoparticles intercalated layered doubled hydroxide nanohybrids.

Anal Chim Acta 2015 Oct 8;898:34-41. Epub 2015 Oct 8.

Key Laboratory for Large-Format Battery Materials and System, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, 430074, PR China; Shenzhen Institute of Huazhong University of Science & Technology, Shenzhen, 518000, PR China. Electronic address:

We report a facile and green method for the fabrication of new type of electrocatalysts based on MnO2 nanoparticles incorporated on MgAl LDH P-type semiconductive channel and explore its practical applications as high-performance electrode materials for electrochemical biosensor. A series of MgAl layered doubled hydroxide (LDH) nanohybrids with fixed Mg/Al (M(2+)/M(3+) atomic ratio of 3) and varied amount of MnCl2.4H2O are fabricated by a facile co-precipitation method. Read More

View Article and Full-Text PDF
October 2015

Long-Term Fluoride Release from Dental Resins Affects STRO-1+ Cell Behavior.

J Dent Res 2015 Aug 29;94(8):1099-105. Epub 2015 Apr 29.

Institute of Bioscience and BioResources, CNR, Naples, Italy

Fluoride-releasing restorative dental materials can be beneficial to remineralize dentin and help prevent secondary caries. However, the effects of fluoride release from dental materials on the activity of dental pulp stem cells are not known. Here we investigate whether different fluoride release kinetics from dental resins supplemented with modified hydrotalcite (RK-F10) or fluoride-glass filler (RK-FG10) could influence the behavior of a human dental pulp stem cell subpopulation (STRO-1(+) cells) known for its ability to differentiate toward an odontoblast-like phenotype. Read More

View Article and Full-Text PDF

Enhancement of acetylene hydrogenation activity over Ni-Zn bimetallic catalyst by doping with Au.

J Nanosci Nanotechnol 2014 Sep;14(9):6894-9

A series of modified Ni-Zn bimetallic catalysts were prepared by depositing different kinds of 4 wt% metals (Ir, Pt, Au, Cu, Ag) on the Ni-Zn-Al hydrotalcite (NZAH) and tested in the selective hydrogenation of acetylene. The activity was enhanced by 3-fold over the 4 wt% Au/NZAH, meanwhile, the yield of C2H4 was also increased more than 4 times compared with the NZAH. Characterization by means of H2-TPR, XRD, SEM, and TEM revealed that Au was highly dispersed on the catalyst, and the ternary Au-Ni-Zn alloy was formed during the H2 reduction at 500 degrees C. Read More

View Article and Full-Text PDF
September 2014

Hydrotalcite-TiO2 magnetic iron oxide intercalated with the anionic surfactant dodecylsulfate in the photocatalytic degradation of methylene blue dye.

J Environ Manage 2015 Jun 7;156:225-35. Epub 2015 Apr 7.

Departamento de Química, Universidade Federal de Viçosa, Av. PH Holfs, s/n, 36571-000 Viçosa, Minas Gerais, Brazil.

The new magnetic photocatalysts HT/TiO2/Fe and HT-DS/TiO2/Fe, modified with the anionic surfactant sodium dodecylsulfate (DS) were successfully synthesized in this work. Titanium dioxide (anatase) followed by iron oxide were deposited on the hydrotalcite support. Several catalyst samples were prepared with different amounts of titanium and iron. Read More

View Article and Full-Text PDF

Catalytic transformation of aliphatic alcohols to corresponding esters in O2 under neutral conditions using visible-light irradiation.

J Am Chem Soc 2015 Feb 30;137(5):1956-66. Epub 2015 Jan 30.

School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, ‡Institute for Future Environments, and §School of Earth, Environmental and Biological Sciences, Queensland University of Technology , Brisbane, QLD 4001, Australia.

Selective oxidation of aliphatic alcohols under mild and base-free conditions is a challenging process for organic synthesis. Herein, we report a one-pot process for the direct oxidative esterification of aliphatic alcohols that is significantly enhanced by visible-light irradiation at ambient temperatures. The new methodology uses heterogenerous photocatalysts of gold-palladium alloy nanoparticles on a phosphate-modified hydrotalcite support and molecular oxygen as a benign oxidant. Read More

View Article and Full-Text PDF
February 2015