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P García-Muñoz, G Pliego, J A Zazo, A Bahamonde, J A Casas
This work assesses the feasibility of several advanced oxidation processes (CWPO Catalytic Wet Peroxide Oxidation), Photocatalysis and their combination (CWPO-Photoassisted process) for sulfonamide antibiotic degradation. Raw ilmenite was used as catalyst in both processes, because of the presence of iron and titanium in its structure. Despite both treatments allowed reaching a total starting antibiotic depletion working at pH0 = 3 and T0 = 30 °C within 30 min reaction time, significant differences were observed in terms of mineralization...
April 18, 2017: Chemosphere
Swetha S M Bhat, Diptikanta Swain, Mikhail Feygenson, Joerg C Neuefeind, Abhishek K Mishra, Janardhan L Hodala, Chandrabhas Narayana, Ganapati V Shanbhag, Nalini G Sundaram
The average structure, local structure, and band structure of nanoparticles of photocatalyst Bi4TaO8Cl, an Aurivillius-Sillen layered material, has been studied by powder neutron Rietveld refinement, neutron pair distribution function technique, Raman scattering, and density functional theory calculations. A significant local structural deviation of nano-Bi4TaO8Cl was established in contrast to the local structure of bulk-Bi4TaO8Cl. Local structure was further supported by Raman scattering measurements. Through DFT calculations, we identify specific features in the electronic band structure that correlate lower secondary structural distortions in nano-Bi4TaO8Cl...
April 21, 2017: Inorganic Chemistry
B Dong, A Oyelade, J A Kelber
Semiconducting boron carbides based on cross-linked carborane (B10C2H12) icosahedra, developed several decades ago, are of significant interest in a variety of emerging areas, including photocatalysis, spintronics, and especially neutron detection. These materials, however, display generally poor charge carrier mobility, high defect levels and other properties that pose significant drawbacks. A class of nanocomposite carborane-based materials has recently been developed, that addresses many of these issues...
April 21, 2017: Physical Chemistry Chemical Physics: PCCP
Andrea E Schlather, Alejandro Manjavacas, Adam Lauchner, Valeria Spolon Marangoni, Christopher J DeSantis, Peter Nordlander, Naomi J Halas
There is currently a worldwide need to develop efficient photocatalytic materials that can reduce the high energy cost of common industrial chemical processes. One possible solution focuses on metallic nanoparticles (NPs) that can act as efficient absorbers of light due to their surface plasmon resonance. Recent work indicates that small NPs, when photoexcited, may allow for efficient electron or hole transfer necessary for photocatalysis. Here we investigate the mechanisms behind hot hole carrier dynamics by studying the photo-driven oxidation of citrate ions on Au@SiO2@Au core-shell nanoparticles...
April 20, 2017: Journal of Physical Chemistry Letters
M Jahurul Islam, Hyun Kook Kim, D Amaranatha Reddy, Yujin Kim, Rory Ma, Heehyun Baek, Joonghan Kim, Tae Kyu Kim
Semiconductor-based photocatalysis is a green method for the removal of toxic organic pollutants by decomposition into harmless products. However, traditional single-component semiconductors are unable to reach high degradation efficiencies due to excessive photo charge carrier recombination. The use of hybrid nanocomposite photocatalysts is a promising strategy for overcoming this problem by reducing recombination as well as ensuring that large amounts of solar energy are harvested. Herein, a novel visible-light-active hybrid nanocomposite, BiOI/MIL-88B(Fe), was successfully synthesized through a simple precipitation method...
April 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Xiang-Yi Chen, Ning-Ning Zhang, Li-Zhen Cai, Pei-Xin Li, Ming-Sheng Wang, Guo-Cong Guo
N,N'-disubstituted bipyridinium (viologen) and N-monosubstituted bipyridinium compounds are well known for their electron-transfer (ET) photochromic behavior. The modification of them was exclusively focused on the N-substituents. For the first time, we studied the photochromic behavior when one pyridyl ring of the bipyridinium was substituted with a multi-functional azole group, and revealed that two new coordination compounds based on N-methyl-4-pyridinium tetrazolate (mptz) zwitterion, [Zn(mptz)2Br2] (1) and [Cd3(mptz)2Cl6]n∙4nH2O (2), exhibit typical ET photochromic behavior owing to photoinduced ET from halogen anion to the mptz ligand...
April 20, 2017: Chemistry: a European Journal
Zhaohui Wang, Hongqi Sun
April 17, 2017: Nanomaterials
Zongnan Zhang, Haijiao Zhang
Porous nanomaterials have attracted extensive interests in adsorption, catalysis, biosensors, and biomedicine due to their high surface area, well-defined pore structure and tunable pore size. However, how to obtain porous nanomaterials of desirable component and unique structure with multifunctionalities and synergetic properties is still a great challenge. In this work, a novel nest-like Ag@mTiO2 hierarchical nanostructure with Ag nanoparticle as the core and a mesoporous crystalline TiO2 as the protective shell was successfully prepared by layer-by-layer assembly technique and alkali-etching hydrothermal route...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Mohammad A Behnajady, Hojjat Dadkhah, Hamed Eskandarloo
In this study, a horizontally rotating disc recirculated (HRDR) photoreactor equipped with two UV lamps (6 W) was designed and fabricated for photocatalytic removal of p-Nitrophenol (PNP). Photocatalyst (TiO2) nanoparticles were immobilized onto a polyethylene disc, and PNP containing solution was allowed to flow (flow rate of 310 mL min(-1)) in radial direction along the surface of the rotating disc illuminated with UV light. The efficiency of direct photolysis and photocatalysis and the effect of rotating speed on the removal of PNP were studied in the HRDR photoreactor...
April 17, 2017: Environmental Technology
Yi-Wen Zheng, Pan Ye, Bin Chen, Qing-Yuan Meng, Ke Feng, Wenguang Wang, Li-Zhu Wu, Chen-Ho Tung
Aryl ethers can be constructed from the direct coupling between the benzene C-H bond and the alcohol O-H bond with the evolution of hydrogen via the synergistic merger of photocatalysis and cobalt catalysis. Utilizing the dual catalyst system consisting of 3-cyano-1-methylquinolinum photocatalyst and cobaloxime, intermolecular etherification of arenes with various alcohols and intramolecular alkoxylation of 3-phenylpropanols with formation of chromanes are accomplished. These reactions proceed at remarkably mild conditions, and the sole byproduct is equivalent hydrogen gas...
April 14, 2017: Organic Letters
Peng Zhang, Yang Chen, Xiaoyan Yang, Jianzhou Gui, Yi Li, Hailong Peng, Dan Liu, Jieshan Qiu
To improve the photocatalytic activity and photostability of ZnO, the novel cable-like Pt/ZnO@C composite is successfully fabricated by coating a 3-5 nm hydrothermal carbon (HTC) layer on the surface of Pt nanoparticle-modified ZnO nanowire. After investigating the optical and photoelectrochemical performance in detail, it is found that the Pt/ZnO@C nanocable shows a dual-enhancing migration efficiency for the photoinduced surface electrons, distributing to the modified Pt nanoparticles and the coated HTC layer...
April 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Angel T Garcia-Esparza, Tatsuya Shinagawa, Samy Ould-Chikh, Muhammad Qureshi, Xuyuan Peng, Nini Wei, Dalaver H Anjum, Alain Clo, Tsu-Chien Weng, Dennis Nordlund, Dimosthenis Sokaras, Jun Kubota, Kazunari Domen, Kazuhiro Takanabe
For overall water-splitting systems, it is essential to establish O2 -insensitive cathodes that allow cogeneration of H2 and O2 . An acid-tolerant electrocatalyst is described, which employs a Mo-coating on a metal surface to achieve selective H2 evolution in the presence of O2 . In operando X-ray absorption spectroscopy identified reduced Pt covered with an amorphous molybdenum oxyhydroxide hydrate with a local structural order composed of polyanionic trimeric units of molybdenum(IV). The Mo layer likely hinders O2 gas permeation, impeding contact with active Pt...
April 13, 2017: Angewandte Chemie
Molin Zhou, Xin Jiang, Xingxing Jiang, Ke Xiao, Yangwu Guo, Hongwei Huang, Zheshuai Lin, Jiyong Yao, Chen-Ho Tung, Li-Zhu Wu, Yicheng Wu
A new Au-based sulfide BaAu2S2 was obtained through solid-state reaction. It crystallizes in the tetragonal space group I41/amd with unit cell parameters of a = 6.389 72(2) Å, b = 6.389 72(2) Å, c = 12.7872(1) Å, and Z = 4. Its structure features [AuS2/2]∞ zigzag chains composed of corner-sharing AuS2 linear units. With a direct band gap of 2.49 eV, BaAu2S2 is suitable for the visible-light harvesting. Moreover, it exhibits excellent visible-light photocatalytic activity, which is 1.3 times that of graphitic carbon nitride (g-C3N4) and also demonstrates excellent circulating stability...
April 12, 2017: Inorganic Chemistry
Hongfeng Zhang, Xiu He, Weiwei Zhao, Yu Peng, Donglan Sun, Hao Li, Xiaocong Wang
Fe3O4/TiO2 magnetic mesoporous composites were synthesized through a sol-gel method with tetra-n-butyl titanate as precursor and surfactant P123 as template. The as-prepared Fe3O4/TiO2 composites were characterized by X-ray diffraction, diffuse reflectance spectroscopy, nitrogen adsorption-desorption isotherm and pore size distribution. The as-synthesized products were applied as photocatalysis for the degradation of Acid Black ATT and tannery wastewater under UV lamp irradiation. Fe3O4/TiO2-8 composites containing Fe3O4 of 8 wt% were selected as model catalysts...
April 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
M Abdullah Dar, Kowsar Majid, Mohd Hanief Najar, R K Kotnala, Jyoti Shah, S K Dhawan, M Farukh
This work reports the exploitation of nanocrystalline Ni0.5Zn0.5Fe2-xCexO4 ferrite for potential application by designing quasi-spherical shaped polythiophene (PTH) composites via in situ emulsion polymerization. The structural, electronic, dielectric, magnetic, and electromagnetic interference (EMI) shielding properties of PTH/Ni0.5Zn0.5Fe2-xCexO4 composites were investigated. Our results suggest that these properties could be optimized by modulating the concentration of x (composition) in the polymer matrix...
April 19, 2017: Physical Chemistry Chemical Physics: PCCP
Xiao-Yuan Liu, Hao Chen, Ruili Wang, Yuequn Shang, Qiong Zhang, Wei Li, Guozhen Zhang, Juan Su, Cao Thang Dinh, F Pelayo García de Arquer, Jie Li, Jun Jiang, Qixi Mi, Rui Si, Xiaopeng Li, Yuhan Sun, Yi-Tao Long, He Tian, Edward H Sargent, Zhijun Ning
Hydrogen generation via photocatalysis-driven water splitting provides a convenient approach to turn solar energy into chemical fuel. The development of photocatalysis system that can effectively harvest visible light for hydrogen generation is an essential task in order to utilize this technology. Herein, a kind of cadmium free Zn-Ag-In-S (ZAIS) colloidal quantum dots (CQDs) that shows remarkably photocatalytic efficiency in the visible region is developed. More importantly, a nanocomposite based on the combination of 0D ZAIS CQDs and 2D MoS2 nanosheet is developed...
April 11, 2017: Advanced Materials
Claudia Coughlan, Maria Ibáñez, Oleksandr Dobrozhan, Ajay Singh, Andreu Cabot, Kevin M Ryan
This review captures the synthesis, assembly, properties, and applications of copper chalcogenide NCs, which have achieved significant research interest in the last decade due to their compositional and structural versatility. The outstanding functional properties of these materials stems from the relationship between their band structure and defect concentration, including charge carrier concentration and electronic conductivity character, which consequently affects their optoelectronic, optical, and plasmonic properties...
April 10, 2017: Chemical Reviews
Mahabubur Chowdhury, Sipiwe Shoko, Fransciuos Cummings, Veruscha Fester, Tunde Victor Ojumu
In this work, we have shown that mining waste derived Fe(3+) can be used to enhance the photocatalytic activity of TiO2. This will allow us to harness a waste product from the mines, and utilize it to enhance TiO2 photocatalytic waste water treatment efficiency. An organic linker mediated route was utilized to create a composite of TiO2 and biogenic jarosite. Evidence of FeOTi bonding in the TiO2/jarosite composite was apparent from the FTIR, EFTEM, EELS and ELNEFS analysis. The as prepared material showed enhanced photocatalytic activity compared to pristine TiO2, biogenic jarosite and mechanically mixed sample of jarosite and TiO2 under both simulated and natural solar irradiation...
April 2017: Journal of Environmental Sciences (China)
Xianfeng Zheng, Guofang Shen, Chao Wang, Yu Li, Darren Dunphy, Tawfique Hasan, C Jeffrey Brinker, Bao-Lian Su
Both plants and animals possess analogous tissues containing hierarchical networks of pores, with pore size ratios that have evolved to maximize mass transport and rates of reactions. The underlying physical principles of this optimized hierarchical design are embodied in Murray's law. However, we are yet to realize the benefit of mimicking nature's Murray networks in synthetic materials due to the challenges in fabricating vascularized structures. Here we emulate optimum natural systems following Murray's law using a bottom-up approach...
April 6, 2017: Nature Communications
Peng Zhang, Tomoya Ochi, Mamoru Fujitsuka, Yasuhiro Kobori, Tetsuro Majima, Takashi Tachikawa
The higher-order structures of semiconductor-based photocatalysts play crucial roles in their physicochemical properties for efficient light-to-energy conversion. A novel perovskite SrTiO3 mesocrystal superstructure with well-defined orientation of assembled cubic nanocrystals was synthesized by topotactic epitaxy from TiO2 mesocrystals through a facile hydrothermal treatment. The SrTiO3 mesocrystal exhibits three times the efficiency for the hydrogen evolution of conventional disordered systems in alkaline aqueous solution...
April 6, 2017: Angewandte Chemie
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