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Wesley Richard Browne, Juan Chen, Apparao Draksharapu, Maja Gruden, Stepan Stepanovic
The non-heme (L)FeIII and (L)FeIII-O-FeIII(L) complexes (L = 1,1-di(pyridin-2-yl)-N,N-bis(pyridin-2-ylmethyl)ethan-1-amine) undergoes reduction under irradiation to the FeII state with concomitant oxidation of methanol to methanal, without the need for a secondary photosensitizer. Spectroscopic and Density Functional Theory (DFT) studies support a mechanism in which irradiation results in charge transfer excitation of a FeIII--O-FeIII complex to generate [(L)FeIV=O]2+ (observed transiently during irradiation in acetonitrile), and an equivalent of LFeII...
January 15, 2018: Angewandte Chemie
Huang Wen, Hua Li, Suisui He, Fengjuan Chen, Erli Ding, Sha Liu, Baodui Wang, Yong Peng
Although substantial efforts have been made toward the synthesis of noble metal-semiconductor heteronanostructures, direct in situ synthesis of two-dimensional (2D) core-shell semiconductor@noble metal heterostructured nanosheets remains largely unexplored. Herein, we report the synthesis of a novel 2D core-shell CuFeSe2@Au heterostructured nanosheet with an amorphous core and a crystalline shell based on the reversed growth of Au nanosheets on the CuFeSe2 frameworks under near-infrared (NIR) illumination. The nanosheet exhibits strong absorbance in the NIR region, and the valence band top of CuFeSe2@Au nanosheets is higher than the oxidation potential of O2/H2O...
January 15, 2018: Nanoscale
Aaron D Proctor, Shobhana Panuganti, Bart M Bartlett
The aerobic photochemical oxidation of benzylamine was carried out on the ternary oxides CuWO4 and BiVO4 as a test proton-coupled-electron-transfer reaction in acetonitrile. Both oxides give the coupled imine product, N-benzylidenebenzylamine, in near quantitative (98-99%) yield, with rate constants of 0.34 h-1 g-1 and 0.70 h-1 g-1 for CuWO4 and BiVO4, respectively.
January 15, 2018: Chemical Communications: Chem Comm
Fan Lin, Jiabai Cai, Yuehai Li, Huiwu Yu, Shunxing Li
Using ammonium molybdate and thiourea as precursors, nitrogen-doped MoO3 was produced by a one-step carbonization and then fixed into the cellulose filter paper (NMCP) with acrylic resin as a fixative. NMCP was designed as a multifunctional nanocomposite, i.e., solid phase adsorbent for Fe(III) preconcentration, photocatalyst for iron species transformation and color interference removal, and colorimetric sensor for Fe(III) determination. After photocatalysis, the complex of Fe-humic substances could be transformed into Fe(III) ions, the interference of colored organic matter (e...
April 1, 2018: Talanta
Amir Mirzaei, Laleh Yerushalmi, Zhi Chen, Fariborz Haghighat, Jianbo Guo
The presence of antibiotics in water bodies has received increasing attention since they are continuously introduced and detected in the environment and may cause unpredictable environmental hazards and risks. The photocatalytic degradation of sulfamethoxazole (SMX) by ZnO in the presence of fluoride ions (F-ZnO) was evaluated. The effects of operating parameters on the efficiency of SMX removal were investigated by using response surface methodology (RSM). Under the optimum condition, i.e. photocatalyst dosage = 1...
January 11, 2018: Water Research
Huiping Chen, Nan Chen, Chuanping Feng, Yu Gao
Ag6Si2O7, a visible light-driven photocatalyst, has attracted considerable attention owing to its enormous environmental remediation potential. In this work, a magnetic iron(II,III) oxide/titania/silver silicate (Fe3O4/TiO2/Ag6Si2O7) nanocomposite was synthesized by anchoring TiO2 and Ag6Si2O7 on the surface of Fe3O4 nanoparticles. The morphology, crystal structure, as well as the spectroscopic, magnetic, and photocurrent properties of the as-prepared Fe3O4/TiO2/Ag6Si2O7 nanocomposite were studied. Methylene blue (MB) was used for evaluating the photocatalytic performance under simulated visible light...
January 6, 2018: Journal of Colloid and Interface Science
Brindha Appavu, Sivakumar Thiripuranthagan, Sudhakar Ranganathan, Elangovan Erusappan, Kathiravan Kannan
Herein, we report the synthesis of novel nitrogen doped reduced graphene oxide/ BiVO4 photo catalyst by single step hydrothermal method. The physicochemical properties of the catalysts were characterized using XRD, N2 adsorption-desorption, Raman, XPS, SEM TEM, DRS-UV and EIS techniques. The synthesized catalysts were tested for their catalytic activity in the photo degradation of some harmful textile dyes (methylene blue & congo red) and antibiotics (metronidazole and chloramphenicol) under visible light irradiation...
January 10, 2018: Ecotoxicology and Environmental Safety
Indrajit Shown, Satyanarayana Samireddi, Yu-Chung Chang, Raghunath Putikam, Po-Han Chang, Amr Sabbah, Fang-Yu Fu, Wei-Fu Chen, Chih-I Wu, Tsyr-Yan Yu, Po-Wen Chung, M C Lin, Li-Chyong Chen, Kuei-Hsien Chen
Photocatalytic formation of hydrocarbons using solar energy via artificial photosynthesis is a highly desirable renewable-energy source for replacing conventional fossil fuels. Using an L-cysteine-based hydrothermal process, here we synthesize a carbon-doped SnS2 (SnS2-C) metal dichalcogenide nanostructure, which exhibits a highly active and selective photocatalytic conversion of CO2 to hydrocarbons under visible-light. The interstitial carbon doping induced microstrain in the SnS2 lattice, resulting in different photophysical properties as compared with undoped SnS2...
January 12, 2018: Nature Communications
Chao Liu, Justin M Notestein, Eric Weitz, Kimberly A Gray
The reduction of CO2 is a promising route to produce valuable chemicals or fuels and create C-neutral resource cycles. Many different approaches to CO2 reduction have been investigated, but the ability of vacuum UV (VUV) irradiation to cleave C-O bonds has remained largely unexplored for use in processes that convert CO2 into useful products. Compared with other photo-driven CO2 conversion processes, here we demonstrate that VUV-initiated CO2 reduction can achieve much greater conversion under common photochemical reaction conditions when H2 and non-reducible oxides are present...
January 12, 2018: ChemSusChem
Chen Ye, Jia-Xin Li, Hao-Lin Wu, Xu-Bing Li, Bin Chen, Chen-Ho Tung, Li-Zhu Wu
The catalytic ability of graphitic carbon nitride is greatly affected by its intrinsic electronic properties. Though combination with chromophore has been demonstrated to be one of the promising approaches to improve the catalytic performance of carbon nitride, it is imperative to understand the key factors governed the whole process. Here we report a composite photocatalyst CN-P by embedding perylene unit into the matrix of carbon nitride. The composite photocatalyst could catalyze hydrogen evolution with a high rate of 17...
January 12, 2018: ACS Applied Materials & Interfaces
Yan Lv, Lin Yue, Qian Li, Baoyi Shao, Sen Zhao, Haitao Wang, Shijia Wu, Zhouping Wang
Herein, the design and synthesis of a multifunctional (Fe3O4-NaYF4:Yb,Tm)@TiO2 photocatalyst through a facile sol-gel process combined with electrostatic self-assembly has been reported. Particularly, as an upconversion sensor, NaYF4:Yb,Tm nanoparticles have the ability to convert near-infrared (NIR) light into ultraviolet (UV) emissions, so that the catalytic body TiO2 can indirectly utilize the NIR part of sunlight but not UV light. The excellent photocatalytic activity of the hybrid samples is evaluated using a model of the degradation of methylene blue (MB)...
January 12, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Yuya Asano, Yoshitomo Nagasawa, Eiji Yamaguchi, Akichika Itoh
In the proposed study, transition-metal-free synthesis of β-alkoxy monohydroperoxides via aerobic photooxidation using an acridinium photocatalyst was developed. This method enables the synthesis of some novel hydroperoxides. The peroxide source is molecular oxygen, which is cost-effective and is atomically efficient. Magnesium oxide plays an important role as a base in the catalytic system.
January 12, 2018: Chemistry, An Asian Journal
Maressa Maria de Melo Santos, Marta Maria Menezes Bezerra Duarte, Graziele Elisandra do Nascimento, Natalya Barbosa Guedes de Souza, Otidene Rossiter Sá da Rocha
This work proposes the use of plastic residues, more specifically polystyrene packaging, to support TiO2, used as a photocatalyst in the degradation of erythrosine and Brilliant Blue food dyes. The scanning electron microscopy and Fourier transform infrared spectroscopy analyses exhibited the surface coating and the presence of TiO2 in the material, respectively. The UV/H2O2/TiO2((SP)supported) process was used in the preliminary study, given the high percentage of degradation, operational advantages and greater reductions in peaks related to the aromatic rings when compared to the other processes studied...
January 12, 2018: Environmental Technology
Kenji Shirai, Gianluca Fazio, Toshiki Sugimoto, Daniele Selli, Lorenzo Ferraro, Kazuya Watanabe, Mitsutaka Haruta, Bunsho Ohtani, Hiroki Kurata, Cristiana Di Valentin, Yoshiyasu Matsumoto
Heterogeneous photocatalysis is vital in solving energy and environmental issues that this society is confronted with. Although photocatalysts are often operated in the presence of water, it has not been yet clarified how the interaction with water itself affects charge dynamics in photocatalysts. Using water-coverage controlled steady and transient infrared absorption spectroscopy and large-model (∼800 atoms) ab-initio calculations, we clarify that water enhances hole trapping at the surface of TiO2 anospheres but not of well-faceted nanoparticles...
January 12, 2018: Journal of the American Chemical Society
Bruce E Rittmann
Having worked with biofilms since the 1970s, I know that they are ubiquitous in nature, of great value in water technology, and scientifically fascinating. Biofilms are naturally able to remove BOD, transform N, generate methane, and biodegrade micropollutants. What I also discovered is that biofilms can do a lot more for us in terms of providing environmental services if we give them a bit of help. Here, I explore how we can use active substrata to enable our biofilm partners to provide particularly challenging environmental services...
December 28, 2017: Water Research
Jianhao Guo, Huixian Shi, Xiaobo Huang, Huifang Shi, Zhongfu An
An AgCl/Ag3PO4 composite has been successfully fabricated by a simple desorption-precipitation method. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible spectroscopy (UV/Vis), and photoluminescence (PL) have been used to study the structural and physicochemical characteristics of the AgCl/Ag3PO4 composite. The photocatalytic activity of the AgCl/Ag3PO4 composite has been tested by the degradation of parabens under visible-light irradiation...
January 4, 2018: Journal of Colloid and Interface Science
Shu-Mei Xia, Yan-Qing Zhang, Ya-Fang Zheng, Chang-Song Xu, Guang-Min Liu
Doping non-metals into TiO2 has been regarded as a promising way to gain more effective photocatalyst. In this paper, N, F-codoped TiO2 was synthesized by sol-gel method, demonstrating both high adsorption capacity and high photocatalytic activity under visible light irradiation. Samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and UV-visible diffuse reflectance spectra (UV-vis DRS ). The results show that N, F-codoping can reduce the impact of calcination temperature on the structure and morphology of the sample, and then the sample exhibits good thermal stability, even when the calcination temperature changes in a large range ,instead of rutile, the anatase around 20 nm is the only phase in N, F-codoped samples...
January 11, 2018: Environmental Technology
Misbah Ullah Khan, Hongjun You, Xiaotong Liu, Lingling Zhang, Jixiang Fang
Precisely engineering the decoration of metal nanoparticles on the special surface of semiconductor represents a promising strategy to design efficient metal-semiconductor heterostructured photocatalysts. This study demonstrates a versatile soft-template method to fabricate a novel nonsymmetrical heterostructured Ag/AgI nanoplate, in which only one side surface of the nanoplate is covered with uniform 2D Ag nanoweb. Compared with symmetrical heterostructure, the nonsymmetrical heterostructure may further facilitate the separation of photogenerated electron-hole pairs and shows a greatly enhanced photocatalytic activity...
January 10, 2018: Small
Yamei Liu, Caili Hou, Tifeng Jiao, Jingwen Song, Xu Zhang, Ruirui Xing, Jingxin Zhou, Lexin Zhang, Qiuming Peng
The design and self-assembly of graphene oxide (GO)-based composite membranes have attracted enormous attention due to their wide application in nanomaterial and environmental fields. In this work, we have successfully developed a strategy to fabricate new composite membranes based on poly(vinyl alcohol)/poly(acrylic acid)/carboxyl-functionalized graphene oxide modified with silver nanoparticles (PVA/PAA/GO-COOH@AgNPs), which were prepared via thermal treatment and the electrospinning technique. Due to the strong π-π forces and strong electrostatic interactions of GO-COOH sheets, the prepared composite membranes and their lager surface areas were modified by scores of AgNPs, which demonstrated that a high-efficiency photocatalyst removed the organic dyes from the aqueous solutions...
January 10, 2018: Nanomaterials
Shin-Ichi Naya, Takahiro Kume, Ryo Akashi, Musashi Fujishima, Hiroaki Tada
A key material for artificial photosynthesis including water splitting is heteronanostructured (HNS) photocatalysts. The photocatalytic activity depends on the geometry and dimension, and the quality of junctions between the components. Here we present a half-cut Au(core)-CdS(shell) (HC-Au@CdS) nanoegg as a new HNS plasmonic photocatalyst for water splitting. UV-light irradiation of Au nanoparticle (NP)-loaded ZnO (Au/ZnO) at 50oC induces the selective deposition of hexagonal CdS on the Au surface of Au/ZnO with an epitaxial (EPI) relation of CdS{0001}/Au{111}...
January 10, 2018: Journal of the American Chemical Society
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