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First-principles study of the electronic and optical properties of the (Y,N)-codoped anatase TiO_2 photocatalyst

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Chinese Physics B 2012年第3期21卷 164-170页

作者：林彦明姜振益胡晓云张小东樊君苗慧商毅博 Institute of Modern Physics Northwest University Department of Physics Northwest University School of Chemical Engineering Northwest University

First-principles plane-wave pseudopotential calculations are performed to study the geometrical structures, for- mation energies, and electronic and optical properties of Y-doped, N-doped, and （Y, N）-codoped Ti02. The calculated results show that Y and N codoping leads to lattice distortion, easier separation of photogenerated electron-hole pairs and band gap narrowing. The optical absorption spectra indicate that an obvious red-shift occurs upon Y and N codoping, which enhances visible-light photocatalytic activity.

关键词： TiO2 codoping visible-light photocatalyst first-principles calculation

Novel ternary g-C_3N_4/Fe_3O_4/MnWO_4 nanocomposites: Synthesis,characterization, and visible-light photocatalytic performance for environmental purposes

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Journal of Materials Science & Technology 2018年第9期34卷 1638-1651页

作者： Mitra Mousavi Aziz Habibi-Yangjeh Davod Seifzadeh Department of Chemistry Faculty of Science University of Mohaghegh Ardabili

The g-C3 N4/Fe3 O4/MnWO4 nanocomposites were prepared by a refluxing-calcination procedure. visiblelight-induced photocatalytic experiments showed that the g-C3 N4/Fe3 O4/MnWO4（10%） nanocomposite has excellent ability to degrade a range of contaminants including rhodamine B, methylene blue, methyl orange, and fuchsine, which is about 7, 10, 25, and 31 times of the g-C3 N4 photocatalyst, *** species trapping experiments revealed that superoxide anion radicals play major role in the photodegradation reaction of rhodamine B（RhB）. After the treatment process, the utilized photocatalyst was magnetically recovered and reused with negligible loss in the photocatalytic activity, which is vital in the photocatalytic processes. Finally, a mechanism was proposed for the enhanced interfacial carrier separation and transfer and the improved photocatalytic performance.

关键词： g-C3N4/Fe3O4/MnWO4 Magnetically recoverable photocatalyst visible-light photocatalyst Wastewater

Gamma Ray Radiation Effect on Bi2WO6 photocatalyst

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Chinese Journal of Chemical Physics 2018年第5期31卷 701-706,736页

作者： Qiang Zhang Zhi-wen Jiang Mo-zhen Wang Xue-wu Ge CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China

The development of Bi2WO6-based materials has become one of research hotspots due to the increasing demands on high-efficient photocatalyst responding to visible *** this work,the effect of high energy radiation(γ-ray)on the structure and the photocatalytic activity of Bi2WO6 nanocrystals was first *** morphological change of Bi2WO6 nanocrystals was observed by SEM underγ-ray ***,the XRD spectra of the irradiated Bi2WO6 nanocrystals showed the characteristic 2θof(113)plane shifts slightly from 28.37o to 28.45o with the increase of the absorbed dose,confirming the change in the crystal structure of *** XPS results proved the crystal structure change was originated from the generation of oxygen vacancy defects under high-dose *** photocatalytic activity of Bi2WO6 on the decomposition of methylene blue(MB)in water under visible light increases gradually with the increase of absorbed ***,the improved photocatalytic performance of the irradiated Bi2WO6 nanocrystals remained after three cycles of photocatalysis,indicating a good stability of the created oxygen vacancy *** work gives a new simple way to improve photocatalytic performance of Bi2WO6 through creating oxygen vacancy defects in the crystal structure by-ray radiation.

关键词： Bi2WO6 Gamma ray Oxygen vacancy visible-light photocatalyst

Recent developments in visible-light photocatalytic degradation of antibiotics

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Chinese Journal of Catalysis 2016年第6期37卷 792-799页

作者：李娣施伟东江苏大学能源研究院江苏镇江212013 江苏大学化学化工学院江苏镇江212013

With the significant discharge of antibiotic wastewater into the aquatic and terrestrial ecosystems, antibiotic pollution has become a serious problem and presents a hazardous risk to the environment. To address such issues, various investigations on the removal of antibiotics have been undertaken. Photocatalysis has received tremendous attention owing to its great potential in removing antibiotics from aqueous solutions via a green, economic, and effective process. However, such a technology employing traditional photocatalysts suffers from major drawbacks such as light absorption being restricted to the UV spectrum only and fast charge recombination. To overcome these issues, considerable effort has been directed towards the development of advanced visible light-driven photocatalysts. This mini review summarises recent research progress in the state-of-the-art design and fabrication of photocatalysts with visible-light response for photocatalytic degradation of antibiotic wastewater. Such design strategies involve the doping of metal and non-metal into ultraviolet light-driven photocatalysts, development of new semiconductor photocatalysts, construction of heterojunction photocatalysts, and fabrication of surface plasmon resonance-enhanced photocatalytic systems. Additionally, some perspectives on the challenges and future developments in the area of photocatalytic degradation of antibiotics are provided.

关键词： Antibiotic visible-light photocatalyst Photocatalytic degradation Doping Heterojunction Surface plasmon resonance-enhanced photocatalysis

CdS-modified one-dimensional g-C_3N_4 porous nanotubes for efficient visible-light photocatalytic conversion

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Chinese Journal of Catalysis 2019年第6期40卷 959-968页

作者： Ben Chong Lei Chen Dezhi Han Liang Wang Lijuan Feng Qin Li Chunhu Li Wentai Wang Key Laboratory of Marine Chemistry Theory and Technology Ministry of EducationCollege of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100ShandongChina College of Chemical Engineering Qingdao University of Science and TechnologyQingdao 266042ShandongChina Queensland Micro-and Nanotechnology Centre Griffith University Nathan CampusBrisbaneQLD 4111Australia

A heterojunction photocatalyst based on porous tubular g-C3N4 decorated with CdS nanoparticles was fabricated by a facile hydrothermal co-deposition *** one-dimensional porous structure of g-C3N4 provides a higher specific surface area,enhanced light absorption,and better separation and transport performance of charge carriers along the longitudinal direction,all of which synergistically contribute to the superior photocatalytic activity *** significantly enhanced catalytic efficiency is also a benefit originating from the fast transfer of photogenerated electrons and holes between g-C3N4 and CdS through a built-in electric field,which was confirmed by investigating the morphology,structure,optical properties,electrochemical properties,and photocatalytic *** degradation of rhodamine B(RhB)and photocatalytic hydrogen evolution reaction were also carried out to investigate its photocatalytic *** can be degraded completely within 60 min,and the optimum H2 evolution rate of tubular g-C3N4/CdS composite is as high as 71.6μmol h^–1,which is about 16.3 times higher than that of pure bulk *** as-prepared nanostructure would be suitable for treating environmental pollutants as well as for water splitting.

关键词： Tubular g-C3N4 CdS visible-light photocatalyst Hydrogen evolution Photocatalytic dye degradation