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M Trejo-Valdez, S R Hernández-Guzmán, M E Manriquez-Ramírez, H Sobral, H Martínez-Gutiérrez, C Torres-Torres
Removal of hexavalent chromium was accomplished by using photocatalyst materials of TiO2 doped with tungsten oxide, environmental air as oxygen supply and white light as irradiation source. Dichromate anions in concentration ranges of 50 to 1000 μg/L were removed by means of aqueous dispersions of TiO2 doped with tungsten. The aqueous chromium analyses were performed by Differential Pulse Voltammetry technique. Additionally, mineralization of CO2 gas was promoted by the photocatalysis process, as was clearly shown by Raman spectroscopy and X-ray Photoelectron Spectroscopy (XPS) analyses obtained from the TiO2 samples recovered after photocatalytic experiments...
May 15, 2018: Journal of Hazardous Materials
Jiafeng Ding, Gaoyuan Long, Yang Luo, Runze Sun, Mengxia Chen, Yajun Li, Yanfang Zhou, Xinhua Xu, Weirong Zhao
Polychlorinated dibenzo-p-dioxins (PCDDs), as a group of notorious anthropogenic environmental toxicants, are arguably ubiquitous in nature. In this study, we investigated the photocatalytic reductive dechlorination of 2-chlorodibenzo-p-dioxin (2-CDD) over Pd/g-C3 N4 catalysts under UV-vis irradiation. The g-C3 N4 and a series of Pd/g-C3 N4 catalysts were prepared by thermal polymerization and mechanical mixing-illumination method and characterized by XRD, TEM, BET, SEM and UV-vis DRS analyses. Among all the samples, the Pd/g-C3 N4 (5 wt%) yielded the optimal dechlorination activity with a total 2-CDD conversion of 54% within 4 h, and 76% of those converted 2-CDD were evolved to dibenzo-p-dioxin (DD)...
May 9, 2018: Journal of Hazardous Materials
Alka Tiwari, Alok Shukla, Lalliansanga, Diwakar Tiwari, Seung Mok Lee
The aim of this communication is to synthesize novel Nanocomposite thin film materials (Ag0 (NP)/TiO2 ) using the template process. Surface morphology of materials was obtained by the Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) analyses. The presence of doped Ag-nanoparticles was confirmed by the TEM images along with the SEM-EDX analyses. The Atomic Force Microscopic images were demonstrated the surface roughness and thickness of Nanocomposite thin films. X-ray diffraction analysis confirmed that TiO2 was predominantly present to its anatase mineral phase...
May 15, 2018: Journal of Environmental Management
Guifang Ge, Xinwen Guo, Chunshan Song, Zhongkui Zhao
Developing a facile method to overcome the intrinsic shortcomings of g-C3N4 photocatalyst concerning its insufficient visible-light absorption and dissatisfactory separation efficiency of charge carriers is of great significance but remains a challenge. In this work, we report, for the first time, a sapiential strategy for preparing highly-efficient nitrogen deficient g-C3N4 featuring bunchy microtubes (R-TCN) via a KOH-assisted hydrothermal treatment of rodlike melamine-cyanuric acid supramolecular aggregates (RMCA) followed by heating the reconstructed RMCA, in which KOH serves as an all-rounder for breaking hydrogen bonds, accelerating hydrolysis of melamine and nitrogen defects forming...
May 18, 2018: ACS Applied Materials & Interfaces
Zengyu You, Chenyan Wu, Qianhong Shen, Yang Yu, Hao Chen, Yuxuan Su, Hui Wang, Chunchun Wu, Fang Zhang, Hui Yang
An efficient and facile method to fabricate a surficial dispersive heterojunction based on the assembly of g-C3N4 nanoparticles was proposed. A p-n nano heterojunction composed of BiOI and g-C3N4 was constructed by simply loading g-C3N4 nanoparticles on flower-like BiOI nanosheets. The structure-dependent optical, electronic and photoelectric properties were investigated, and the structure-property relationship was discussed. The results show that the g-C3N4 nanoparticles are uniformly loaded on the surface of BiOI nanosheets and thus form a p-n heterojunction with an intimate interface...
May 18, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Taiping Xie, Hui Li, Chenglun Liu, Longjun Xu
Ag/BiVO₄/Mn1-x Znx Fe₂O₄ was synthesized with a dip-calcination in situ synthesis method. This work was hoped to provide a simple method to synthesis three-phase composite. The phase structure, optical properties and magnetic feature were confirmed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectrometer (XPS), transmission electron microscopy (TEM), ultraviolet-visible diffuse reflectance spectrophotometer (UV-vis DRS), and vibrating sample magnetometer (VSM)...
May 16, 2018: Materials
Xiangying Liu, Yu Li, Xuguo Zhou, Kun Luo, Lifeng Hu, Kailin Liu, Lianyang Bai
Dimethoate, a systemic insecticide, has been used extensively in vegetable production. Insecticide residues in treated vegetables, however, pose a potential risk to consumers. Photocatalytic degradation is a new alternative to managing pesticide residues. In this study, the degradation of dimethoate in Bok choy was investigated under the field conditions using cerium-doped nano titanium dioxide (TiO2/Ce) hydrosol as a photocatalyst. The results show that TiO2/Ce hydrosol can accelerate the degradation of dimethoate in Bok choy...
2018: PloS One
Jing Fang, Jiajun Gu, Qinglei Liu, Wang Zhang, Huilan Su, Di Zhang
Localized surface plasmon resonance (LSPR) of plasmonic metals (e.g. Au) can help semiconductors improve their photocatalytic hydrogen (H2) production performance. However, artificial synthesis of hierarchical plasmonic structures down to nanoscales is usually difficult. Here, we adopt butterfly wing scales from Morpho didius to fabricate three dimensional (3D) CdS/Au butterfly wing scales for plasmonic photocatalysis. The as-prepared materials well inherit the pristine hierarchical bio-structures. The 3D CdS/Au butterfly wing scales exhibit high H2 production rate (221...
May 17, 2018: ACS Applied Materials & Interfaces
Swarnava Nandy, Takashi Hisatomi, Song Sun, Masao Katayama, Tsutomu Minegishi, Kazunari Domen
Oxysulfoselenide semiconductor photocatalysts absorb light at longer wavelengths than the corresponding oxysulfides. However, the synthesis of oxysulfoselenides is challenging due to excessive particle growth and the limited availability of metal selenide precursors. In this study, a La5 Ti2 CuS5 O7 (LTCSO) oxysulfide was annealed with Se powder in sealed, evacuated quartz tubes to obtain LTCSO:Se photocatalysts, and the properties of these materials were investigated. Se was found to be incorporated into the LTCSO upon heating at 973 K or higher, and the Se/(S + Se) ratio was increased to a maximum of 0...
May 17, 2018: ACS Applied Materials & Interfaces
Akif Zeb, Shafaq Sahar, Umair Yaqub Qazi, Atheer Hameid Odda, Naseeb Ullah, Ya-Nan Liu, Ishtiaq A Qazi, An-Wu Xu
Heteropolyacids (HPAs) are a class of polyoxometallates (POMs) with oxygen-rich surfaces. Herein, we have developed an Fe-containing heteropolyacid by cation-exchange and employed KFePW12O40 nanostructures for Fenton, photo-Fenton and enzyme-mimetic reactions. The as-prepared KFePW12O40 catalyst exhibits efficient degradation of Rhodamine B (RhB) via the photo-Fenton reaction. As an enzyme-mimetic, this material can effectively oxidize TMB and dopamine. The obtained nanomaterials were characterized via SEM, TEM, XPS, BET surface area, TGA, UV-Vis spectroscopy, FT-IR, and XRD techniques...
May 17, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Yujie Bai, Gaixia Luo, Lijuan Meng, Qinfang Zhang, Ning Xu, Haiyang Zhang, Xiuqiang Wu, Fanjie Kong, Baolin Wang
Searching for two-dimensional semiconductor materials that are suitable for visible-light photocatalytic water splitting provides a sustainable solution to deal with the future energy crisis and environmental problems. Herein, based on first-principles calculations, single-layer ZnMN2 (M = Si, Ge, Sn) zinc nitrides are proposed as efficient photocatalysts for water splitting. Stability analyses show that the single-layer ZnMN2 zinc nitrides exhibit energetic and dynamical stability. The electronic properties reveal that all of the single-layer ZnMN2 zinc nitrides are semiconductors...
May 17, 2018: Physical Chemistry Chemical Physics: PCCP
M Akkari, P Aranda, A Ben Haj Amara, E Ruiz-Hitzky
ZnO-clay nanoarchitectures have been prepared by In Situ generation of ZnO nanoparticles from zinc acetylacetonate in isopropanol under reflux in the presence of organoclays. Two layered clays, a commercial Wyoming montmorillonite and a smectite from Gafsa (Tunisia), and a fibrous clay, sepiolite from Vallecas-Vicalvaro (Spain), modified with cetyltrimethylammonium ions were the organoclay substrates for assembling the formed nanoparticles. After a convenient thermal treatment, the organic matter is eliminated and the ZnO/clay nanoarchitectures consolidated...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Kuppulingam Thirumalai, Manohar Shanthi, Meenakshisundaram Swaminathan
In this article we report preparation of 5 wt% HoVO4 doped ZnO via template-free hydrothermal process and investigated its photocatalytic activity against azo dyes Rhodamine-B (Rh-B), Trypan Blue (TB) and Acid Black 1 (AB 1) in solar light irradiation. The as prepared HoVO4 doped ZnO was characterised by X-ray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM), Field emission Transmission electron microscopy (FE-TEM), Brunauer-Emmett-Teller (BET) surface area measurements, X-ray photoelectron spectroscopy (XPS), Diffused reflectance (DRS) and Photoluminescence (PL) spectroscopy...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Rama Gaur, P Jeevanandam
The present study reports the synthesis of SnS2 nanoparticles with different morphologies via a facile thermal decomposition approach. The SnS2 nanoparticles were synthesized using tin chloride and thiourea (or thioacetamide) in two different solvents (diphenyl ether and 1-octadecene). The SnS2 nanoparticles were extensively characterized using different analytical techniques. The crystallite size of SnS2 varies from 6.1 nm to 19.0 nm. Electron microscopy studies indicate that the SnS2 samples consist of flakes which assemble into different hierarchical structures such as ball dahlia, peony dahlia-like nanoflowers, nanoyarns and linear structures under different synthetic conditions...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Tzong-Horng Liou, Li-Wai Hung, Hao-Siang Syu, Liang Chu
This paper reports the preparation of TiO2 based photocatalysts from two different types of silica materials, silica gel and SBA-15. This study examines the factors that affect the photocatalytic activity of catalyst composite, such as types of silica support, TiO2 loading, and pH value of dye solution. The samples were characterized by XRD, UV-vis, FTIR, FE-SEM, TEM, TGA, and surface area analyzer. Experimental results show that TiO2 supported on silica gel or SBA-15 materials can effectively enhance photocatalytic reaction than unsupported catalysts...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Magdalena Staniszewska, Stephan Kupfer, Julien Guthmuller
Time-dependent density functional theory calculations combined with the Marcus theory of electron transfer (ET) were applied on the molecular photocatalyst [(tbbpy)2Ru(tpphz)PdCl2]2+ in order to elucidate the light-induced relaxation pathways populated upon excitation in the longer wavelength range of its absorption spectrum. The computational results show that after the initial excitation, metal (Ru) to ligand (tpphz) charge transfer (MLCT) triplet states are energetically accessible, but that an ET toward the catalytic center (PdCl2) from these states is a slow process, with estimated time constants above 1 ns...
May 16, 2018: Chemistry: a European Journal
Julien Genovino, Yajing Lian, Yuan Zhang, Taylor O Hope, Antoine Juneau, Yohann Gagné, Gajendra Ingle, Mathieu Frenette
A metal-free photoredox C-H alkylation of heteroaromatics from readily available carboxylic acids using an organic photocatalyst and hypervalent iodine reagents under blue LED light is reported. The developed methodology tolerates a broad range of functional groups and can be applied to the late-stage functionalization of drugs and drug-like molecules. The reaction mechanism was investigated with control experiments and photophysical experiments as well as DFT calculations.
May 16, 2018: Organic Letters
Sumin Cho, Changui Ahn, Junyong Park, Seokwoo Jeon
Considering the environmental issues, it is essential to develop highly efficient and recyclable photocatalysts in purification systems. Conventional TiO2 nanoparticles have strong intrinsic oxidizing power and high surface area, but are difficult to collect after use and rarely absorb visible light, resulting in low photocatalytic efficiency under sunlight. Here we develop a new type of highly efficient and recyclable photocatalyst made of a three-dimensional (3D) nanostructured N-doped TiO2 monolith with enhanced visible light absorption...
May 16, 2018: Nanoscale
Fabio Lima, Lars Grunenberg, Husaini B A Rahman, Ricardo Labes, Joerg Sedelmeier, Steven V Ley
We report an acridium-based organic photocatalyst as an efficient replacement for iridium-based photocatalysts to oxidise boronic acid derivatives by a single electron process. Furthermore, we applied the developed catalytic system to the synthesis of four active pharmaceutical ingredients (APIs). A straightforward scale up approach using continuous flow photoreactors is also reported affording gram an hour throughput.
May 16, 2018: Chemical Communications: Chem Comm
Shintaro Ida, Kenta Sato, Tetsuya Nagata, Hidehisa Hagiwara, Motonori Watanabe, Kim Namhoon, Yoshihito Shiota, Michio Koinuma, Sakae Takenaka, Elif Ertekin, Tatsumi Ishiihara
The hydrogen evolution reaction using semiconductor photocatalysts has been significantly improved by cocatalyst loading. However, there are still many speculations regarding the actual role of the cocatalyst. Here we report a photocatalytic hydrogen evolution reaction pathway on a cocatalyst site using TiO2 nanosheets doped with Rh at Ti sites as one-atom cocatalysts. A hydride species adsorbed on the one-atom Rh dopant cocatalyst site was confirmed experimentally as the intermediate state for hydrogen evolution, which was consistent with the results of density functional theory (DFT) calculations...
May 15, 2018: Angewandte Chemie
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