scholarly journals Visible light activity of Bi2WO6@TCNQ with core–shell structure in phenol degradation

RSC Advances ◽  
2018 ◽  
Vol 8 (62) ◽  
pp. 35367-35373
Author(s):  
Yunxia Wei ◽  
Wenlu Li ◽  
Hong Miao ◽  
Hanjie Zhang ◽  
Mingguang Ma
Keyword(s):  
Visible Light ◽  
Shell Structure ◽  
Organic Pollutant ◽  
Phenol Degradation ◽  
Core Shell ◽  
Light Activity ◽  
Visible Irradiation ◽  
Core Shell Structure

Under visible irradiation, the photogenerated holes on the HOMO orbit of TCNQ can be injected into the VB of Bi2WO6 resulting in the oxidation of organic pollutant directly.

Visible Light Activity in Phenol Degradation of C60@P25 Photocatalyst with Core–Shell Structure

2020 ◽  
Vol 15 (2) ◽  
pp. 189-196
Author(s):  
Ming-Guang Ma ◽  
Yun-Xia Wei ◽  
Sheng-Ying Li ◽  
Fang Liu ◽  
Guo-Hu Zhao
Keyword(s):  
Visible Light ◽  
Conduction Band ◽  
Hydroxyl Radicals ◽  
Shell Structure ◽  
Apparent Rate Constant ◽  
Phenol Degradation ◽  
Core Shell ◽  
Photogenerated Electrons ◽  
Light Activity ◽  
Core Shell Structure

C60@P25 photocatalyst with core–shell structure was synthesized by adsorption methods. Under visible light irradiation, the electrons of the excited C60 (C*60) adsorbed on the surface of P25can be injected into the conduction band of the P25. The electrons could combine with O2 easily, which promotes the formation of hydroxyl radicals which contributes to the dramatic visible light activity of C60@P25 photocatalyst in phenol degradation. The apparent rate constant of C60@P25 photocatalyst in phenol degradation is almost 3.3 times of which of P25. At the same time, the phenol can be mineralized completely. Under UV irradiation, the photogenerated electrons on the conduction band of P25 can be injected into the LUMO orbit of C60, which is too low that electrons could not combine with O2 easily, interdicting the formation of hydroxyl radicals, resulting in the decrease of photoactivity and weakening in the mineralization of phenol.

Synthesis of urchin-like Fe3O4@SiO2@ZnO/CdS core–shell microspheres for the repeated photocatalytic degradation of rhodamine B under visible light

2016 ◽  
Vol 6 (12) ◽  
pp. 4525-4534 ◽  
Author(s):  
Jinghai Yang ◽  
Jian Wang ◽  
Xiuyan Li ◽  
Dandan Wang ◽  
Hang Song
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
Shell Structure ◽  
Photocatalytic Performance ◽  
Core Shell ◽  
Visible Irradiation ◽  
Core Shell Structure

Magnetically retrievable Fe3O4@SiO2@ZnO/CdS microspheres with a well-designed core–shell structure and excellent visible-irradiation photocatalytic performance were successfully synthesized.

Preparation, Characterization and Visible-Light Catalytic Activity of Core-Shell Structure NiFe2O4@TiO2 Ferrite Nanoparticles

2016 ◽  
Vol 680 ◽  
pp. 272-277
Author(s):  
Zhou Li Lu ◽  
Peng Zhao Gao ◽  
Rui Xue Ma ◽  
Yu Kun Sun ◽  
Dong Yun Li
Keyword(s):  
Catalytic Activity ◽  
Visible Light ◽  
Shell Structure ◽  
Shell Thickness ◽  
Spinel Ferrite ◽  
Sol Gel ◽  
Magnetic Core ◽  
Core Shell ◽  
Calcination Temperatures ◽  
Core Shell Structure

The core-shell structure NiFe2O4@TiO2 nanoparticles was successfully prepared using a sol-gel method, the influence of shell thickness and calcination temperatures on the composition, microstructure, magnetic properties and visible-light catalytic activity of the nanoparticles was studied by XRD, TEM, Uv–vis, vibrating sample magnetometer, etc. Results showed the main composition of core in NiFe2O4@TiO2 was spinel ferrite, and the shell was anatase TiO2, and theshell thickness increased significantly with the increase of TiO2 content, ranging from 10nm to 50nm. The Ms and Mr of nanoparticles decreased with the increase of TiO2 content, and no obvious reaction between the magnetic core and shell occurred; visible-light degradation percent of NiFe2O4@TiO2 nanoparticles increased along with the increase of TiO2 content, whereas the recovery rate of it decreased. Degradation percent and the recovery percent of NiFe2O4@TiO2-50 still reached 93.7% and 90.5%, even after 10 cycle times, respectively, possessing the excellent long-term stability.

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