Hydrothermal Synthesis and Photocatalytic Hydrogen Generation of Cr3+ Doped Porous ZnIn2S4 Photocatalysts

2013 ◽  
Vol 651 ◽  
pp. 54-59 ◽  
Author(s):  
Wei Wu ◽  
Xue Feng Bai
Keyword(s):  
Crystal Structure ◽  
Photocatalytic Activity ◽  
Hydrothermal Synthesis ◽  
Hydrothermal Method ◽  
Doping Concentration ◽  
Hydrogen Generation ◽  
Electron Hole ◽  
Facile Hydrothermal Method ◽  
Photocatalytic Hydrogen Generation ◽  
Hole Recombination

A series of Cr3+doped porous ZnIn2S4photocatalysts were synthesized via a facile hydrothermal method using cetylpyridiniumbromide (CPBr) as template. The above-prepared photocatalysts were characterized by XRD, FESEM, DRS and XPS. The effects of different Cr3+doping concentration on the morphology and photocatalytic activity of ZnIn2S4photocatalysts were investigated. It is demonstrated from the experimental results that Cr3+doping in the ZnIn2S4photocatalyst had significantly influence on the crystal structure, electron-hole recombination and photocatalytic activity. The highest rate of hydrogen evolution of 3115.2 μmol/(h•g) over Cr3+(0.5%)- ZnIn2S4photocatalyst was observed.

Boosting charge separation of Sr2Ta2O7 by Cr doping for enhanced visible light-driven photocatalytic hydrogen generation

2019 ◽  
Vol 6 (11) ◽  
pp. 3057-3062 ◽  
Author(s):  
Weixuan Zeng ◽  
Sheng Cao ◽  
Lulu Qiao ◽  
Anquan Zhu ◽  
Quanyin Ma ◽  
...  
Keyword(s):  
Visible Light ◽  
Hydrothermal Method ◽  
Charge Separation ◽  
Photocatalytic Performance ◽  
Hydrogen Generation ◽  
Facile Hydrothermal Method ◽  
Photocatalytic Hydrogen Generation ◽  
Visible Light Driven ◽  
Cr Doping

Visible-light driven Cr-doped Sr2Ta2O7 nanosheets with enhanced photocatalytic performance were prepared by a facile hydrothermal method.

RGO/BiVO4 with Photocatalytic Activity by a Hydrothermal Method

2014 ◽  
Vol 809-810 ◽  
pp. 912-915
Author(s):  
Dan Li ◽  
Lian Wei Shan ◽  
Li Min Dong ◽  
Gui Lin Wang ◽  
Ze Wu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Photocatalytic Activity ◽  
Electron Microscope ◽  
Hydrothermal Method ◽  
Photogenerated Electron ◽  
X Ray Diffraction ◽  
Electron Hole ◽  
X Ray ◽  
Micro Morphology ◽  
Scanning Electron

RGO/BiVO4powders were prepared by a hydrothermal method. The crystal structure of RGO/BiVO4was investigated by X-ray diffraction (XRD). Scanning electron microscope (SEM) was used to characterize the micro-morphology of RGO/BiVO4. The recombination rate of photogenerated electron-hole pairs were investigated by fluorescence spectrophotometer. Photocatalytic properties of the prepared samples were examined by studying the degradation of model dyes magenta.

Enhanced visible-active photocatalytic behaviors observed in Mn-doped BiFeO3

2018 ◽  
Vol 32 (17) ◽  
pp. 1850185 ◽  
Author(s):  
Yun-Hui Si ◽  
Yu Xia ◽  
Ya-Yun Li ◽  
Shao-Ke Shang ◽  
Xin-Bo Xiong ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Band Gap ◽  
Diffuse Reflectance Spectroscopy ◽  
X Ray Diffraction ◽  
Electron Hole ◽  
X Ray ◽  
Mn Doped ◽  
Hole Recombination ◽  
Narrow Band Gap Semiconductors

A series of BiFeO3 and BiFe[Formula: see text]Mn[Formula: see text]O3 (x = 0, 0.02, 0.04, 0.06, 0.08, 0.10) were synthesized by a hydrothermal method. The samples were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy (EDS) and UV–Vis diffuse reflectance spectroscopy, and their photocatalytic activity was studied by photocatalytic degradation of methylene blue in aqueous solution under visible light irradiation. The band gap of BiFeO3 was significantly decreased from 2.26 eV to 1.90 eV with the doping of Mn. Furthermore, the 6% Mn-doped BiFeO3 photocatalyst exhibited the best activity with a degradation rate of 94% after irradiation for 100 min. The enhanced photocatalytic activity with Mn doping could be attributed to the enhanced optical absorption, increment of surface reactive sites and reduction of electron–hole recombination. Our results may be conducive to design more efficient photocatalysts responsive to visible light among narrow band gap semiconductors.

Facile preparation of C, N co-modified Nb2O5 nanoneedles with enhanced visible light photocatalytic activity

2016 ◽  
Vol 45 (41) ◽  
pp. 16519-16525 ◽  
Author(s):  
Jiao Xue ◽  
Runwei Wang ◽  
Zongtao Zhang ◽  
Shilun Qiu
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Nitrogen Source ◽  
Hydrothermal Method ◽  
Niobium Pentoxide ◽  
Facile Hydrothermal Method ◽  
Carbon And Nitrogen ◽  
Niobium Chloride ◽  
Facile Preparation ◽  
Visible Light Photocatalytic

C, N co-modified niobium pentoxide (Nb2O5) nanoneedles have been successfully synthesized via a facile hydrothermal method with Niobium Chloride (NbCl5) as a precursor and triethylamine as both the carbon and nitrogen source.

The Effect of Chromium on the Optical Properties and Photoactivity of Nano-Particulate Rutile

2012 ◽  
Vol 554-556 ◽  
pp. 502-506 ◽  
Author(s):  
Li Wei Wang ◽  
Terry A. Egerton
Keyword(s):  
Optical Properties ◽  
Photocatalytic Activity ◽  
Reflectance Spectroscopy ◽  
Electron Trapping ◽  
Electron Hole ◽  
High Chromium ◽  
Chromium Doping ◽  
Chromium Addition ◽  
Co Precipitation ◽  
Hole Recombination

Chromium doped rutile TiO2was synthesized by either co-precipitation or impregnation (surface-doping) and characterized by XRD and reflectance spectroscopy. Chromium addition did not change the TiO2structure nor did the structure of the co-precipitated products differ from that of the impregnated samples. However, chromium doping moved the absorption of both sets of products into the visible and significantly affected the TiO2photocatalytic activity for isopropanol (IPA) oxidation. At high chromium concentrations the photoactivity of the co-precipitated samples was reduced by a larger amount than that of the impregnated samples; this was attributed to a higher concentration of Cr3+ions in the rutile lattice. Unexpectedly, increased photoactivity was measured for low Cr levels of surface-doped rutile. This may be caused by increased electron-trapping, at surface Cr6+ions, and correspondingly reduced, electron-hole recombination.

Dynamic charge transfer through Fermi level equilibration in the p-CuFe2O4/n-NiAl LDH interface towards photocatalytic application

2020 ◽  
Vol 10 (18) ◽  
pp. 6285-6298 ◽  
Author(s):  
Snehaprava Das ◽  
Sulagna Patnaik ◽  
Kulamani Parida
Keyword(s):  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Energy Level ◽  
Fermi Level ◽  
Vacuum Energy ◽  
Electron Hole ◽  
Photocatalytic Application ◽  
Dynamic Charge ◽  
Hole Recombination

The Ni Al LDH–CuFe2O4 p–n heterojunction, through vacuum energy level bending, inhibits electron hole recombination and enhances photocatalytic activity.

One-step solvothermal fabrication of Cu@PANI core–shell nanospheres for hydrogen evolution

Nanoscale ◽  
2018 ◽  
Vol 10 (46) ◽  
pp. 22055-22064 ◽  
Author(s):  
Ting Wang ◽  
Dan Wu ◽  
Youliang Wang ◽  
Tingbo Huang ◽  
Gary Histand ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Hydrogen Evolution ◽  
Light Absorption ◽  
Good Stability ◽  
Core Shell ◽  
Electron Hole ◽  
Facile Hydrothermal Method ◽  
Strong Light ◽  
Efficient Separation ◽  
One Step

Cu@PANI core–shell nanospheres synthesized by a facile hydrothermal method exhibit strong light absorption, good stability and efficient separation of photo-generated electron–hole pairs.

Unraveling the quantum dynamics origin of high photocatalytic activity in nitrogen-doped anatase TiO2: time-domain ab initio analysis

2020 ◽  
Vol 8 (47) ◽  
pp. 25235-25244
Author(s):  
Yating Yang ◽  
Zhaosheng Zhang ◽  
Wei-Hai Fang ◽  
Sebastian Fernandez-Alberti ◽  
Run Long
Keyword(s):  
Photocatalytic Activity ◽  
Ab Initio ◽  
Time Domain ◽  
Quantum Dynamics ◽  
High Photocatalytic Activity ◽  
Anatase Tio2 ◽  
Electron Hole ◽  
Nitrogen Doped ◽  
Hole Recombination

TiO2 doping with nitrogen greatly suppresses nonradiative electron-hole recombination and enhances photocatalytic activity.

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