Photocatalytic activity of SnO2–α-Fe2O3 composite mixtures: exploration of number of active sites, turnover number and turnover frequency

2018 ◽  
Vol 2 (4) ◽  
pp. 796-806 ◽  
Author(s):  
L. Gomathi Devi ◽  
R. Shyamala
Keyword(s):  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Active Sites ◽  
Separation Process ◽  
Schematic Diagram ◽  
Charge Transfer Process ◽  
Turnover Frequency ◽  
Turnover Number ◽  
Electron Hole ◽  
Uv Visible

Schematic diagram showing energy band edge positions, vectorial charge transfer process and electron hole separation process in the SnO2–α-Fe2O3 composite under UV/visible light irradiation.

Improved photocatalytic activity of RGO/MoS2 nanosheets decorated on TiO2 nanoparticles

RSC Advances ◽  
2016 ◽  
Vol 6 (38) ◽  
pp. 31661-31667 ◽  
Author(s):  
Dipak Bapurao Nimbalkar ◽  
Hsin-Hsi Lo ◽  
P. V. R. K. Ramacharyulu ◽  
Shyue-Chu Ke
Keyword(s):  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Tio2 Nanoparticles ◽  
Recombination Rate ◽  
Active Sites ◽  
Mos2 Nanosheets ◽  
Electron Hole ◽  
Interfacial Charge Transfer ◽  
Surface Active ◽  
Interfacial Charge

Interfacial charge transfer from TiO2 nanoparticles to layered MoS2 surface active sites via RGO nanosheets by suppressing the recombination rate of electron–hole pairs for enhanced photocatalytic activity.

scholarly journals Decolorization of Methylene Blue by Ag/SrSnO3 Composites under Ultraviolet Radiation

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Patcharanan Junploy ◽  
Titipun Thongtem ◽  
Somchai Thongtem ◽  
Anukorn Phuruangrat
Keyword(s):  
Electron Microscopy ◽  
Methylene Blue ◽  
Uv Radiation ◽  
Photoelectron Spectroscopy ◽  
Separation Process ◽  
X Ray Diffraction ◽  
Electron Hole ◽  
X Ray ◽  
Negative Effect ◽  
Uv Visible

SrSn(OH)6 precursors synthesized by a cyclic microwave radiation (CMR) process were calcined at 900°C for 3 h to form rod-like SrSnO3. Further, the rod-like SrSnO3 and AgNO3 in ethylene glycol (EG) were ultrasonically vibrated to form rod-like Ag/SrSnO3 composites, characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), electron microscopy (EM), Fourier transform infrared (FTIR) spectroscopy, and UV-visible analysis. The photocatalyses of rod-like SrSnO3, 1 wt%, 5 wt%, and 10 wt% Ag/SrSnO3 composites were studied for degradation of methylene blue (MB, C16H18N3SCl) dye under ultraviolet (UV) radiation. In this research, the 5 wt% Ag/SrSnO3 composites showed the highest activity, enhanced by the electron-hole separation process. The photoactivity became lower by the excessive Ag nanoparticles due to the negative effect caused by reduction in the absorption of UV radiation.

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.

scholarly journals Annealing Effect of ZnO Seed Layer on Enhancing Photocatalytic Activity of ZnO/TiO2Nanostructure

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Woo-Young Kim ◽  
Soon-Wook Kim ◽  
Dae-Hwang Yoo ◽  
Eui Jung Kim ◽  
Sung Hong Hahn
Keyword(s):  
Photocatalytic Activity ◽  
Seed Layer ◽  
Zno Nanorods ◽  
X Ray Diffraction ◽  
Flower Structure ◽  
Electron Recombination ◽  
Electron Hole ◽  
Oxygen Defects ◽  
Uv Visible ◽  
Beam Deposition

Zinc oxide (ZnO)/titanium dioxide (TiO2) nanorods have been synthesized via a hydrothermal method for ZnO nanorods and an electron-beam deposition for TiO2nanorods. This work examined the effect of annealing ZnO seed layer on the photocatalytic activity of the ZnO/TiO2nanorods which was determined from photodecomposition of methylene blue under UV irradiation. The photocatalytic activity of the ZnO/TiO2nanorods was improved with increasing annealing temperature of the seed layer from 300°C to 500°C. Annealing the seed layer at 500°C showed the best photocatalytic activity resulting from high UV absorption ability, a large surface area with flower structure and copious oxygen defects which promote separation of electron-hole pairs reducing electron recombination. The prepared nanorods were characterized by field emission-scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), photoluminescence (PL), and UV-visible spectroscopy.

Facile synthesis of meso-porous ZnO nano-triangular prisms with enhanced photocatalytic activity

RSC Advances ◽  
2015 ◽  
Vol 5 (38) ◽  
pp. 30120-30124 ◽  
Author(s):  
K. Vignesh ◽  
Sora Kang ◽  
Byeong Sub Kwak ◽  
Misook Kang
Keyword(s):  
Photocatalytic Activity ◽  
Transfer Process ◽  
Light Irradiation ◽  
Solar Light ◽  
Schematic Diagram ◽  
Facile Synthesis ◽  
Electron Hole ◽  
Hole Transfer ◽  
Simulated Solar Light ◽  
Solar Light Irradiation

A schematic diagram of the electron–hole transfer process in ZnO-nt under simulated solar light irradiation.

Uniform decoration of UiO-66-NH2 nanooctahedra onto TiO2 electrospun nanofibers for enhancing photocatalytic H2 production based on multi-step interfacial charge transfer

2021 ◽  
Author(s):  
Jie Wang ◽  
Zhen-Gang Sun ◽  
Xiaoyi Jiang ◽  
Qing Yuan ◽  
Da-Peng Dong ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Metal Organic Frameworks ◽  
Electrospun Nanofibers ◽  
H2 Production ◽  
Charge Transfer Process ◽  
Efficient Charge ◽  
Metal Organic ◽  
Inorganic Semiconductor ◽  
Interfacial Charge

Metal-organic frameworks (MOFs) materials have been extensively incorporated with inorganic semiconductor photocatalysts to improve the photocatalytic activity through an efficient charge transfer process across their hetero-interface. In this work, octahedral...

Enhanced visible light photocatalytic activity of AgI/TiO2 composite fabricated by a grinding method

2019 ◽  
Vol 54 (3) ◽  
pp. 257-264
Author(s):  
Jin Xu ◽  
Dasheng Gao ◽  
Shuang Cui ◽  
Xiaohua Wang ◽  
Ningning Liu
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Active Sites ◽  
Photocatalytic Performance ◽  
Photogenerated Electron ◽  
Active Species ◽  
Electron Hole ◽  
Grinding Method ◽  
The Stability ◽  
Visible Light Photocatalytic

Abstract Through a simple grinding method, AgI/TiO2 composites were successfully synthesized. The as-prepared AgI/TiO2 composites were used as photocatalysts for Rhodamine B (RhB) degradation under visible light irradiation and exhibited excellent photocatalytic performance. In the presence of composites, almost 100% RhB was decomposed after 60 min. The photocatalytic activity of AgI/TiO2-0.5 composite was optimal, which was 9.5 times higher than that of pristine TiO2, and 15.6 times higher than that of AgI. Moreover, experimental results revealed that the improved photocatalytic activity was not only ascribed to the loading AgI but also resulted from the method that enabled the exposure of more active sites in the composites. In addition, the intimate interfacial contact obtained by this method could also promote the efficient separation of photogenerated electron-hole pairs. Moreover, the possible photocatalytic active species and the stability of the photocatalyst were investigated in detail.

scholarly journals Fabrication of a novel BiOI/KTaO3 p–n heterostructure with enhanced photocatalytic performance under visible-light irradiation

RSC Advances ◽  
2020 ◽  
Vol 10 (18) ◽  
pp. 10921-10931 ◽  
Author(s):  
Xiaoxiao Lu ◽  
Qiang Li ◽  
Shihao Liu ◽  
Rui Luo ◽  
Hong Li ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Photocatalytic Performance ◽  
Separation Process ◽  
Light Irradiation ◽  
Schematic Diagram

Schematic diagram of the formation of p–n junction and the charge transfer and separation process under visible light irradiation.

A new strategy for the controllable growth of MOF@PBA architectures

2019 ◽  
Vol 7 (29) ◽  
pp. 17266-17271 ◽  
Author(s):  
Xiao Xiao ◽  
Guangxun Zhang ◽  
Yuxia Xu ◽  
Hualin Zhang ◽  
Xiaotian Guo ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Composite Materials ◽  
Synergistic Effect ◽  
Transfer Process ◽  
Active Sites ◽  
Charge Transfer Process ◽  
New Strategy ◽  
Controllable Growth

Multilevel nanostructures can expose more active sites and promote the charge transfer process, and different composite materials can promote the synergistic effect.

Fabrication and characterization of Ag2CO3/SnS2 composites with enhanced visible-light photocatalytic activity for the degradation of organic pollutants

RSC Advances ◽  
2015 ◽  
Vol 5 (105) ◽  
pp. 86705-86712 ◽  
Author(s):  
Jin Luo ◽  
Xiaosong Zhou ◽  
Jinquan Zhang ◽  
Zhihua Du
Keyword(s):  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Organic Pollutants ◽  
Photogenerated Electron ◽  
Electron Hole ◽  
Efficient Charge ◽  
Fabrication And Characterization ◽  
Interfacial Charge ◽  
Visible Light Photocatalytic

The efficient charge transfer at the interfaces of the Ag2CO3/SnS2 composite due to the inner established electric field (E), which effectively facilitated interfacial charge transfer and improved photogenerated electron–hole pairs separation.

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