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https://www.readbyqxmd.com/read/27933749/black-magic-in-gray-titania-noble-metal-free-photocatalytic-h2-evolution-from-hydrogenated-anatase
#1
Ning Liu, Xuemei Zhou, Nhat Truong Nguyen, Kristina Peters, Florian Zoller, Imgon Hwang, Christopher Schneider, Matthias E Miehlich, Detlef Freitag, Karsten Meyer, Dina Fattakhova-Rohlfing, Patrik Schmuki
'Black' TiO2 -in the widest sense, TiO2 reduced by various treatments-has attracted tremendous scientific interest in recent years because of some outstanding properties; most remarkably in photocatalysis. While the material effects visible light absorption (the blacker, the better), black titania produced by high pressure hydrogenation was recently reported to show another highly interesting feature; noble-metal-free photocatalytic H2 generation. In a systematic investigation of high-temperature hydrogen treatments of anatase nanoparticles, TEM, XRD, EPR, XPS, and photoelectrochemistry are used to characterize different degrees of surface hydrogenation, surface termination, electrical conductivity, and structural defects in the differently treated materials...
December 9, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27933684/enhancement-of-ag-based-plasmonic-photocatalysis-in-the-hydrogen-production-from-ammonia-borane-by-the-assist-of-single-site-ti-oxide-moiety-within-the-silica-framework
#2
Priyanka Verma, Yasutaka Kuwahara, Kohsuke Mori, Hiromi Yamashita
Ag nanoparticles (NPs) have gained great attention owing to their interesting plasmonic properties showing efficient catalysis under visible light irradiation. In this study, Ag-based plasmonic catalyst supported on the mesoporous silica involving isolated and tetrahedrally coordinated single-site Ti-oxide moieties, Ag/Ti-SBA-15, has been designed with the purpose of utilizing the broad spectrum range of solar energy. The Ti-SBA-15 support allows the deposition of small Ag NPs with a narrow size distribution...
December 9, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27933495/photocatalysis-of-s-metolachlor-in-aqueous-suspension-of-magnetic-cerium-doped-mtio2-core-shell-under-simulated-solar-light
#3
J Mermana, P Sutthivaiyakit, C Blaise, F Gagné, S Charnsethikul, P Kidkhunthod, S Sutthivaiyakit
Magnetic cerium-doped mesoporous titanium dioxide was synthesized by combining sol-gel method and calcination using tetrabutanate and ammonium cerium nitrate as precursors and Pluronic P123 as a template coating on iron oxide covered with carbon in ethanol. The magnetic Ce-doped catalyst showed only anatase structure with a slight increase in lattice parameters compared to the undoped catalyst. The Ce LIII-edge X-ray absorption near-edge spectroscopy (XANES) spectra showed Ce(3+), and the cerium substitution doping into titanium dioxide was proposed...
December 8, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27932035/photocatalytic-materials-and-technologies-for-air-purification
#4
REVIEW
Hangjuan Ren, Pramod Koshy, Wen-Fan Chen, Shaohua Qi, Charles Christopher Sorrell
Since there is increasing concern for the impact of air quality on human health, the present work surveys the materials and technologies for air purification using photocatalytic materials. The coverage includes (1) current photocatalytic materials for the decomposition of chemical contaminants and disinfection of pathogens present in air and (2) photocatalytic air purification systems that are used currently and under development. The present work focuses on five main themes. First, the mechanisms of photodegradation and photodisinfection are explained...
August 31, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27930846/dark-photocatalysis-storage-of-solar-energy-in-carbon-nitride-for-time-delayed-hydrogen-generation
#5
Vincent Wing-Hei Lau, Daniel Klose, Hatice Kasap, Filip Podjaski, Marie-Claire Pignié, Erwin Reisner, Gunnar Jeschke, Bettina V Lotsch
While natural photosynthesis serves as the model system for efficient charge separation and decoupling of redox reactions, bio-inspired artificial systems typically lack applicability owing to synthetic challenges and structural complexity. We present herein a simple and inexpensive system that, under solar irradiation, forms highly reductive radicals in the presence of an electron donor, with lifetimes exceeding the diurnal cycle. This radical species is formed within a cyanamide-functionalized polymeric network of heptazine units and can give off its trapped electrons in the dark to yield H2 , triggered by a co-catalyst, thus enabling the temporal decoupling of the light and dark reactions of photocatalytic hydrogen production through the radical's longevity...
December 8, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27929463/synthesis-of-hierarchical-zno-cdsse-heterostructure-nanotrees
#6
Zhengxin Li, Jesus Nieto-Pescador, Alexander J Carson, Jolie C Blake, Lars Gundlach
A two-step chemical vapor deposition procedure is here employed to prepare tree-like hierarchical ZnO/CdSSe hetero-nanostructures. The structures are composed of CdSSe branches grown on ZnO nanowires that are vertically aligned on a transparent sapphire substrate. The morphology was measured via scanning electron microscopy. The crystal structure was determined by X-ray powder diffraction analysis. Both the ZnO stem and CdSSe branches have a predominantly wurtzite crystal structure. The mole ratio of S and Se in the CdSSe branches was measured by energy dispersive X-ray spectroscopy...
November 29, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27929157/oxygen-vacancies-at-the-au-srtio3-001-interface-stabilities-electronic-properties-and-effect-on-photocatalysis
#7
Xiangchao Ma, Ying Dai, Mengmeng Li, Baibiao Huang
Oxygen vacancies have proven to induce various and important effects on the properties of materials. In the present work, the thermodynamic stabilities and electronic properties of oxygen vacancies (Ov) on the SrTiO3 (STO)(001) surface and at the Au/STO(001) interface are systematically investigated by means of first-principles calculations. Both the SrO and TiO2 terminated (001) surfaces of STO are examined. It is found that the Ov located in the near-surface region of the two surfaces can be divided into three categories according to their properties: Ov in the surface atomic layer, Ov in the subsurface TiO2 atomic layers, and Ov in the subsurface SrO atomic layers...
December 8, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27925724/interface-structure-band-alignment-and-built-in-potentials-at-lafeo_-3-n-srtio_-3-heterojunctions
#8
Ryan Comes, Scott Chambers
Interface structure at polar-nonpolar interfaces has been shown to be a key factor in controlling emergent behavior in oxide heterostructures, including the LaFeO_{3}/n-SrTiO_{3} system. We demonstrate via high-energy-resolution x-ray photoemission that epitaxial LaFeO_{3}/n-SrTiO_{3}(001) heterojunctions engineered to have opposite interface polarities exhibit very similar band offsets and potential gradients within the LaFeO_{3} films. However, differences in the potential gradient within the SrTiO_{3} layer depending on polarity may promote hole diffusion into LaFeO_{3} for applications in photocatalysis...
November 25, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27925439/surface-faceting-and-reconstruction-of-ceria-nanoparticles
#9
Chengwu Yang, Xiaojuan Yu, Stefan Heißler, Alexei Nefedov, Sara Colussi, Jordi Llorca, Alessandro Trovarelli, Yuemin Wang, Christof Wöll
The surface atomic arrangement of metal oxides determines their physical and chemical properties, and the ability to control and optimize structural parameters is of crucial importance for many applications, in particular in heterogeneous catalysis and photocatalysis. Whereas the structures of macroscopic single crystals can be determined with established methods, for nanoparticles (NPs), this is a challenging task. Herein, we describe the use of CO as a probe molecule to determine the structure of the surfaces exposed by rod-shaped ceria NPs...
December 7, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27922059/protein-self-assembly-onto-nanodots-leads-to-formation-of-conductive-bio-based-hybrids
#10
Xiao Hu, Chenbo Dong, Rigu Su, Quan Xu, Cerasela Zoica Dinu
The next generation of nanowires that could advance the integration of functional nanosystems into synthetic applications from photocatalysis to optical devices need to demonstrate increased ability to promote electron transfer at their interfaces while ensuring optimum quantum confinement. Herein we used the biological recognition and the self-assembly properties of tubulin, a protein involved in building the filaments of cellular microtubules, to create stable, free standing and conductive sulfur-doped carbon nanodots-based conductive bio-hybrids...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27918996/arsenic-removal-from-water-by-coupling-photocatalysis-and-complexation-ultrafiltration-processes-a-preliminary-study
#11
R Molinari, P Argurio
Inorganic As removal from contaminated water has been studied by off-line coupling of photocatalysis and complexation-ultrafiltration (CP-UF), showing that this combination permits to obtain a quite complete arsenic removal from the treated water. Two commercial polymers, poly(dimethylamine-coepichlorohydrin-coethylenediamine) (PDEHED) and poly(diallyl dimethyl amnmonium chloride) (PolyDADMAC) have been tested in the CP-UF process. The operating conditions (pH and polymer/As weight ratio) for As(V) complexation were determined finding values of 7...
November 27, 2016: Water Research
https://www.readbyqxmd.com/read/27918133/luminescent-tungsten-vi-complexes-photophysics-and-applicability-to-organic-light-emitting-diodes-and-photocatalysis
#12
Kwan-Ting Yeung, Wai-Pong To, Chenyue Sun, Gang Cheng, Chensheng Ma, Glenna So Ming Tong, Chen Yang, Chi-Ming Che
The synthesis, excited-state dynamics, and applications of two series of air-stable luminescent tungsten(VI) complexes are described. These tungsten(VI) complexes show phosphorescence in the solid state and in solutions with emission quantum yields up to 22 % in thin film (5 % in mCP) at room temperature. Complex 2 c, containing a 5,7-diphenyl-8-hydroxyquinolinate ligand, displays prompt fluorescence (blue-green) and phosphorescence (red) of comparable intensity, which could be used for ratiometric luminescent sensing...
December 5, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27914351/photocatalytic-degradation-of-industrial-pulp-and-paper-mill-effluent-using-synthesized-magnetic-fe2o3-tio2-treatment-efficiency-and-characterizations-of-reused-photocatalyst
#13
Wennie Subramonian, Ta Yeong Wu, Siang-Piao Chai
In this work, heterogeneous photocatalysis was used to treat pulp and paper mill effluent (PPME). Magnetically retrievable Fe2O3-TiO2 was fabricated by employing a solvent-free mechanochemical process under ambient conditions. Findings elucidated the successful incorporation of Fe2O3 into the TiO2 lattice. Fe2O3-TiO2 was found to be an irregular and slightly agglomerated surface morphology. In comparison to commercial P25, Fe2O3-TiO2 exhibited higher ferromagnetism and better catalyst properties with improvements in surface area (58...
November 30, 2016: Journal of Environmental Management
https://www.readbyqxmd.com/read/27914341/single-crystalline-titanium-dioxide-hollow-tetragonal-nanocones-with-large-exposed-101-facets-for-excellent-photocatalysis
#14
Zhengcui Wu, Yejing Xue, Zexian Zou, Xia Wang, Feng Gao
Crystal facet engineering and surface modification of semiconductor have become important strategies to improve photocatalytic activity by optimizing surface charge carrier separation/transfer and extending solar spectrum utilization. In this work, we report anatase single-crystalline TiO2 hollow tetragonal nanocones with large exposed (101) facets by a facile liquid-phase interfacial synthetic strategy, using the hydrolysis of tetrabutyltitanate with adscititious water in the organic solvent of cyclohexane and a capping agent of 1, 6-hexanediamine...
November 23, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27910986/catalytic-photodegradation-of-pharmaceuticals-homogeneous-and-heterogeneous-photocatalysis
#15
S Klementova, D Kahoun, L Doubkova, K Frejlachova, M Dusakova, M Zlamal
Photocatalytic degradation of pharmaceuticals (hydrocortisone, estradiol, and verapamil) and personal care product additives (parabens-methyl, ethyl, and propyl derivatives) was investigated in the homogeneous phase (with ferric ions as the catalyst) and on TiO2. Ferric ions in concentrations corresponding to concentrations in natural water bodies were shown to be a significant accelerator of the degradation in homogeneous reaction mixtures. In heterogeneous photocatalytic reactions on TiO2, lower reaction rates, but mineralisation to higher extents, were observed...
December 2, 2016: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/27910141/photocatalytic-hydrogen-evolution-driven-by-fefe-hydrogenase-models-tethered-to-fluorene-and-silafluorene-sensitizers
#16
Roman Goy, Luca Bertini, Tobias Rudolph, Shu Lin, Martin Schulz, Giuseppe Zampella, Benjamin Dietzek, Felix H Schacher, Luca De Gioia, Ken Sakai, Wolfgang Weigand
It is successfully shown that photocatalytic proton reduction to dihydrogen in the presence of a sacrificial electron donor, such as trimethylamine (TEA) and ascorbate, can be driven by compact sensitizer-catalyst dyads, that is, dithiolate-bridged [FeFe] hydrogenase models tethered to organic sensitizers, such as fluorenes and silafluorenes (1 a-4 a). The sensitizer-catalyst dyads 1 a-4 a show remarkable and promising catalytic activities as well as enhanced stabilities during photocatalysis performed under UV-light irradiation...
December 2, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27906400/facile-synthesis-and-shape-evolution-of-well-defined-phosphotungstic-acid-potassium-nanocrystals-as-a-highly-efficient-visible-light-driven-photocatalyst
#17
Xinran Li, Huaiguo Xue, Huan Pang
Uniform and hollow rhombic dodecahedral, rhombic dodecahedral, spherical, and semi-hollow K3PW12O40·nH2O nanocrystals are fabricated without any surfactants or templating agents in mild hydrothermal conditions. The shape evolution and growth of these crystals are studied by changing different reaction parameters, such as the reagent, time and temperature. It is found that the temperature and time have significant effects on the possible growth processes of these nanostructures. More importantly, according to photocatalytic results, due to the specific nanostructure-hollow rhombic dodecahedral structure, the hollow rhombic dodecahedral K3PW12O40·nH2O particles with nanopores are shown to be the most effective at activating H2O2, degrading dye pollutants completely after 90 minutes of visible light radiation...
December 1, 2016: Nanoscale
https://www.readbyqxmd.com/read/27906387/hierarchically-porous-materials-synthesis-strategies-and-structure-design
#18
REVIEW
Xiao-Yu Yang, Li-Hua Chen, Yu Li, Joanna Claire Rooke, Clément Sanchez, Bao-Lian Su
Owing to their immense potential in energy conversion and storage, catalysis, photocatalysis, adsorption, separation and life science applications, significant interest has been devoted to the design and synthesis of hierarchically porous materials. The hierarchy of materials on porosity, structural, morphological, and component levels is key for high performance in all kinds of applications. Synthesis and applications of hierarchically structured porous materials have become a rapidly evolving field of current interest...
December 1, 2016: Chemical Society Reviews
https://www.readbyqxmd.com/read/27905488/advanced-fabrication-of-chemically-bonded-graphene-tio2-continuous-fibers-with-enhanced-broadband-photocatalytic-properties-and-involved-mechanisms-exploration
#19
Qingzhe Zhang, Nan Bao, Xinqiang Wang, Xinde Hu, Xinhan Miao, Mohamed Chaker, Dongling Ma
In this article, a novel route for the synthesis of graphene/TiO2 continuous fibers (GTF) using force-spinning combined with water vapor annealing method is reported for the first time. The morphology, structure and optical properties of the composite were fully characterized. With a single step of heat treatment process using steam at ambient conditions, we were able to initiate a series of chemical reactions, such as reduction of graphene oxide (GO), crystallization of TiO2, formation of C-Ti bond, and introduction of oxygen vacancies into TiO2...
December 1, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27901630/emerging-pollutant-treatments-in-wastewater-cases-of-antibiotics-and-hormones
#20
Erika Méndez, Miguel A González-Fuentes, Georgette Rebollar-Perez, Alia Méndez-Albores, Eduardo Torres
Because of the intensive use of pharmaceutical substances in human life, studies on the detection of these chemical compounds and their metabolites as pollutants in water bodies are continuously reported. Some pharmaceutical agents are associated with adverse effects to aquatic life, even at very low concentrations (ng L(-1) to μg L(-1)). For instance, the presence of antibiotics and hormones has been associated with increasing proliferation of antibiotic resistant pathogens and feminization and masculinization of some aquatic organisms...
November 30, 2016: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
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