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Jiahui Kou, Chunhua Lu, Jian Wang, Yukai Chen, Zhongzi Xu, Rajender S Varma
Photocatalysis has been invariably considered as an unselective process (especially in water) for a fairly long period of time, and the investigation on selective photocatalysis has been largely neglected. In recent years, the field of selective photocatalysis is developing rapidly and now extended to several newer applications. This review focuses on the overall strategies which can improve the selectivity of photocatalysis encompassing a wide variety of photocatalysts, and modifications thereof, as well as the related vital processes of industrial significance such as reduction and oxidation of organics, inorganics, and CO2 transformation...
January 17, 2017: Chemical Reviews
Mohua Li, Zhenjian Zheng, Yangqiong Zheng, Cao Cui, Chunxia Li, Zhengquan Li
Development of MOF-based photocatalysts is intriguing research due to their structural flexibility and tremendous catalytic sites, whereas most MOFs only can take use of UV/visible light and lack of response to NIR light. Herein, we present a facile approach to integrate upconversion nanoparticles (UCNPs) with MOF to build a NIR-responsive composite photocatalyst. The MOF shell with controllable thickness can be grown on the UCNPs, thus exhibiting tunable photocatalytic activities under NIR irradiation. Furthermore, we extend visible absorption of the MOF shell by adding -NH2 groups so that the composite photocatalysts have a better utilization of UC emissions and sunlight to improve their activities...
January 12, 2017: ACS Applied Materials & Interfaces
Debabrata Panda, Sivakumar Manickam
: Sonophotocatalysis (SPC) is considered to be one of the important wastewater treatment techniques and hence attracted the attention of researchers to eliminate recalcitrant hazardous organic pollutants from aqueous phase. In general, SPC refers to the integrated use of ultrasonic sound waves, ultraviolet radiation and the addition of a semiconductor material which functions as a photocatalyst. Current research has brought numerous improvements in the SPC based treatment by opting visible light irradiation, nanocomposite catalysts and numerous catalyst supports for better stability and performance...
May 2017: Ultrasonics Sonochemistry
Lutfi Kurnianditia Putri, Boon-Junn Ng, Wee-Jun Ong, Hing Wah Lee, Wei Sea Chang, Siang-Piao Chai
Owing to its superior properties and versatility, graphene has been proliferating the energy research scene in the past decade. In this contribution, nitrogen (N-) and boron (B-) doped reduced graphene oxide (rGO) variants were investigated as a sole photocatalyst for the green production of H2 and their properties with respect to photocatalysis were elucidated for the first time. N-, B- rGOs were facilely prepared via the pyrolysis of graphene oxide with urea and boron anhydride as their respective dopant source...
January 9, 2017: ACS Applied Materials & Interfaces
Simon Kaufhold, Lydia Petermann, Dieter Ulrich Sorsche, Sven Rau
The problematic consequences of using silver carbene precursors for the synthesis of NHC-complexes is elucidated on the example of dinuclear Ru Rh/Ir photocatalysts. Presence of silver in the products is proven and an alternative silver free synthetic approach successfully implemented. A significant difference in performance in photocatalytic hydrogen evolution reactions of catalysts generated by the different strategies is observed.
January 9, 2017: Chemistry: a European Journal
Peng Zhang, Mamoru Fujitsuka, Tetsuro Majima
Plasmonic nanostructures attracting particular interest in plasmon-induced highly energetic electrons, also known as hot electrons, play a fundamental role in photocatalysis for solar energy conversion. Plasmon-induced hot electron excitation, relaxation, transport, and injection to two-dimensional semiconductors are necessary to clearly understand the efficient plasmon-induced chemical reaction. Herein, we use a plasmonic photocatalyst composed of anisotropic gold nanostructures as the electron donor assembled on two-dimensional molybdenum dichalcogenide, monolayer MoS2, as the electron acceptor in order to unveil the plasmon-induced interfacial hot electron transfer for the hydrogen evolution reaction (HER)...
January 9, 2017: Nanoscale
Roberta Lucchetti, Antonietta Siciliano, Laura Clarizia, Danilo Russo, Ilaria Di Somma, Francesco Di Natale, Marco Guida, Roberto Andreozzi, Raffaele Marotta
The photocatalytic removal of nitrate with simultaneous hydrogen generation was demonstrated using zero-valent nano-copper-modified titania (P25) as photocatalyst in the presence of UV-A-Vis radiation. Glycerol, a by-product in biodiesel production, was chosen as a hole scavenger. Under the adopted experimental conditions, a nitrate removal efficiency up to 100% and a simultaneous hydrogen production up to 14 μmol/L of H2 were achieved (catalyst load = 150 mg/L, initial concentration of nitrate = 50 mg/L, initial concentration of glycerol = 0...
January 7, 2017: Environmental Science and Pollution Research International
Guoshuai Liu, Shijie You, Hong Huang, Ming Ma, Nanqi Ren
Photocatalysis has been gaining a growing popularity in water treatment, and their engineered applications inspire the development of effective photocatalyst materials. To develop photocatalyst that is effective for degradation of organic pollutants, we fabricate a novel direct solid Z-scheme BiPO4-Bi2O2(OH)(NO3) (BPO-BHN) heterojunction structured hybrid. The results demonstrate an enhanced photocatalytic activity of BPO-BHN to produce OH radicals, according to diffuse reflectance spectroscopy (DRS), electron spin-resonance resonance (ESR), photoelectrochemical measurements, and theoretical calculation results...
December 23, 2016: Chemosphere
Dingguo Li, Xiaolan Yan, Chunhua Lin, Shengli Huang, Z Ryan Tian, Bing He, Qianqian Yang, Binbin Yu, Xu He, Jing Li, Jiayuan Wang, Huahan Zhan, Shuping Li, Junyong Kang
ZnO/Si nanowire arrays with hierarchical architecture were synthesized by solution method with ZnO seed layer grown by atomic layer deposition and magnetron sputtering, respectively. The photocatalytic activity of the as-grown tree-like arrays was evaluated by the degradation of methylene blue under ultraviolet light at ambient temperature. The comparison of morphology, crystal structure, optical properties, and photocatalysis efficiency of the two samples in different seeding processes was conducted. It was found that the ZnO/Si nanowire arrays presented a larger surface area with better crystalline and more uniform ZnO branches on the whole sidewall of Si backbones for the seed layer by atomic layer deposition, which gained a strong light absorption as high as 98% in the ultraviolet and visible range...
December 2017: Nanoscale Research Letters
Erum Pervaiz, Honghong Liu, Minghui Yang
Present study focused the synthesis of α-MoO3/rGO. One dimensional nano hybrids under mild conditions and a low temperature wet chemical route produced a single, highly pure crystalline orthorhombic α-MoO3 on graphene oxide (GO) sheets. Four nano hybrids as GMO-0, GMO-1, GMO-2, and GMO-3 has been synthesized with a different mass, charging of GO as 0 mg, 40 mg, 60 mg and 100 mg respectively. Photocatalytic performance for organic pollutant reduction has been analyzed. Presence of different amounts of GO in the prepared metal oxide hybrids alters performance of the material as elaborated by Brunauer-Emmett-Teller (BET) surface area, UV-Visible diffused reflectance spectra and resulted in reduction of organic dyes depicted by photocatalytic experiments...
January 5, 2017: Nanotechnology
Henglei Jia, Xiao-Ming Zhu, Ruibin Jiang, Jianfang Wang
Integration of nanoscale plasmonic metals with semiconductors is a promising strategy for utilizing visible and near-infrared light to enhance chemical reactions. Here we report on the preparation of Au/CeO2 microsphere photocatalysts through aerosol spray and the study of their photocatalytic activity toward the aerobic oxidation of 1-phenylethanol under visible light. The microsphere catalysts exhibit a remarkable photocatalytic performance with their turnover frequency values reaching 108 h(-1), which is more than 23 times that of (Au core)@(CeO2 shell) nanostructures and much larger than those obtained previously for the visible-light photocatalytic oxidation of 1-phenylethanol...
January 13, 2017: ACS Applied Materials & Interfaces
Yinlong Du, Ningning Dong, Menghan Zhang, Kai Zhu, Ruiqi Na, Shuling Zhang, Ningwei Sun, Guibin Wang, Jun Wang
Porphyrin-graphene composites have attracted increasing attention due to a number of intriguing functions, and their photoelectrical and catalytic performances are expected to be modulated through different approaches. In the present study, a designed polymer based on phenyl sulfone, (p-amino)phenylhydroquinone, and a symmetrical dinaphthylporphyrin were covalently attached to a graphene oxide (GO) sheet. The formation of the nanohybrid was characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), and Raman, ultraviolet-visible (UV-vis) absorption, steady and transient fluorescence spectroscopy techniques...
January 18, 2017: Physical Chemistry Chemical Physics: PCCP
Meng-Yang Ye, Zhi-Hao Zhao, Zhuo-Feng Hu, Le-Quan Liu, Hui-Ming Ji, Zhu-Rui Shen, Tian-Yi Ma
0D/2D heterojunctions, especially quantum dots (QDs)/nanosheets (NSs) have attracted significant attention for use of photoexcited electrons/holes due to their high charge mobility. Herein, unprecedent heterojunctions of vanadate (AgVO3 , BiVO4 , InVO4 and CuV2 O6 ) QDs/graphitic carbon nitride (g-C3 N4 ) NSs exhibiting multiple unique advances beyond traditional 0D/2D composites have been developed. The photoactive contribution, up-conversion absorption, and nitrogen coordinating sites of g-C3 N4 NSs, highly dispersed vanadate nanocrystals, as well as the strong coupling and band alignment between them lead to superior visible-light-driven photoelectrochemical (PEC) and photocatalytic performance, competing with the best reported photocatalysts...
January 4, 2017: Angewandte Chemie
Enna Ha, Wei Liu, Luyang Wang, Ho-Wing Man, Liangsheng Hu, Shik Chi Edman Tsang, Chris Tsz-Leung Chan, Wai-Ming Kwok, Lawrence Yoon Suk Lee, Kwok-Yin Wong
Hydrogen generation from water using noble metal-free photocatalysts presents a promising platform for renewable and sustainable energy. Copper-based chalcogenides of earth-abundant elements, especially Cu2ZnSnS4 (CZTS), have recently arisen as a low-cost and environment-friendly material for photovoltaics and photocatalysis. Herein, we report a new heterostructure consisting of CZTS nanoparticles anchored onto a MoS2-reduced graphene oxide (rGO) hybrid. Using a facile two-step method, CZTS nanoparticles were in situ grown on the surface of MoS2-rGO hybrid, which generated high density of nanoscale interfacial contact between CZTS and MoS2-rGO hybrid...
January 3, 2017: Scientific Reports
Paola Villegas-Guzman, Javier Silva-Agredo, Oscar Florez, Ana L Giraldo-Aguirre, Cesar Pulgarin, Ricardo A Torres-Palma
To provide new insights toward the selection of the most suitable AOP for isoxazolyl penicillins elimination, the degradation of dicloxacillin, a isoxazolyl penicillin model, was studied using different advanced oxidation processes (AOPs): ultrasound (US), photo-Fenton (UV/H2O2/Fe(2+)) and TiO2 photocatalysis (UV/TiO2). Although all processes achieved total removal of the antibiotic and antimicrobial activity, and increased the biodegradability level of the solutions, significant differences concerning the mineralization extend, the pH of the solution, the pollutant concentration and the chemical nature of additives were found...
December 28, 2016: Journal of Environmental Management
Ali Fakhri, Mahsa Naji
In this project, synthesis of pure and gold doped PdO-reduced graphene oxide nanocomposites by sonochemical and deposition-precipitation process was performed and characterized using X-ray diffraction (XRD), transmission electronic microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The specific surface area of synthesized un-doped and Au doped PdO-RGO nanocomposites is 83.2, 109.1m(2)g(-1) and total pore volume is 0.31, 0.40cm(3)g(-1), respectively. With Tetrodotoxin as a target pollutant, photocatalytic system of UV+photocatalyst+H2O2 was set up...
December 23, 2016: Journal of Photochemistry and Photobiology. B, Biology
Qiaolin Wu, Wanting Liu, Qing Su, Pengyao Ju, Bixuan Guo, Hui Zhou, Guanghua Li
A hydrazone-based covalent organic framework (COF) was synthesized by condensation of 2,5-dimethoxyterephthalohydrazide with 1,3,5-triformylbenzene under solvothermal conditions. The COF material exhibits excellent porosity with a BET surface area of up to 1501 m2g-1, high crystallinity, and good thermal and chemical stability. The COF material exhibited efficient photocatalytic activity towards cross-dehydrogenative coupling (CDC) reactions between tetrahydroisoquinolines and nucleophiles such as nitromethane, acetone and phenylethyl ketone...
December 29, 2016: ChemSusChem
Zhenwei Tong, Dong Yang, Zhen Li, Yanhu Nan, Fei Ding, Yichun Shen, Zhongyi Jiang
Inspired by the orderly stacked nanostructure and highly integrated function of thylakoids in a natural photosynthesis system, multishell g-C3N4 (MSCN) nanocapsule photocatalysts have been prepared by SiO2 hard template with different shell layers. The resultant triple-shell g-C3N4 (TSCN) nanocapsules display superior photocatalysis performance to single-shell and double-shell counterparts owing to excellent visible-light harvesting and electron transfer properties. Specially, with the increase of the shell layer number, light harvesting is greatly enhanced...
January 3, 2017: ACS Nano
Mei-Ling Yang, Nan Zhang, Kang-Qiang Lu, Yi-Jun Xu
Considerable attention has been focused on transforming graphene (GR) into semiconducting GR by diverse strategies, which can perform as one type of promising photocatalyst toward various photoredox reactions. Herein, we report a facile alkali-assisted hydrothermal method for simultaneous tailoring of the lateral size of GR and nitrogen (N) doping into the GR matrix, by which small-sized N-doped GR (S-NGR) can be obtained. For comparison, large-sized N-doped GR (L-NGR) has also been achieved through the same hydrothermal treatment except for the addition of alkali...
January 9, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Guocheng Huang, Tsz Wai Ng, Taicheng An, Guiying Li, Dehua Xia, Ho Yin Yip, Huijun Zhao, Po Keung Wong
Photocatalysis provides a "green" and effective strategy for water disinfection. During the photocatalytic disinfection process, intracellular organic matter (IOM) from bacterial cells may be released into the bulk solution. In this study, the role of released IOM in the photocatalytic bacterial inactivation was investigated by fractionation procedure and fluorescence excitation-emission-matrix (EEM) combined with parallel factor analysis (PARAFAC) approaches. The normal bacterial cells treated by TiO2-UVA in the presence and absence with fractionated IOM results implied that the released IOM would be either absorbed on the surface of the photocatalysts or reacted by the photo-generated reactive species, and thereby affecting the kinetics of photocatalytic bacterial inactivation...
December 21, 2016: Water Research
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