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Yuelin Wei

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Organization: Huaqiao University
Department: Engineering Research Center of Environment-Friendly Functional Materials, Ministry of Education
Title:
Controllable fabrication of Bi2O3/TiO2 heterojunction with excellent visible-light responsive photocatalytic performance
Co-reporter:Yunfang Huang, Yuelin Wei, Jing Wang, Dan Luo, Leqing Fan, Jihuai Wu
Applied Surface Science 2017 Volume 423(Volume 423) pp:
Publication Date(Web):30 November 2017
DOI:10.1016/j.apsusc.2017.06.158
•TiO2-Bi2O3 with hierarchical morphology is achieved on FTO electrodes.•Combined hydrothermal, sol-gel hydrolysis and calcination step is followed.•Morphological evolution and heterojunction formation is critically discussed.•Composites were active for dye degradation under visible light.Three-dimensional Bi2O3/TiO2 hierarchical composites have been successfully prepared by a two-step hydrothermal method and subsequent calcination. The samples were characterized using XRD, SEM, TEM, EDS, BET and DRS. The measurement results signified that heterojunctions of various morphologies β-Bi2O3 growing on the three-dimensional hierarchical anatase TiO2 nanorods arrays on FTO glass were apparently formed. The morphology of Bi2O3 changed from three-dimension flower-like microstructures to the sphere-like nanoparticles as the Li(OH) dosage increased. The photocatalytic results showed that all samples exhibited much higher photocatalytic activities than that of pure Bi2O3 and TiO2 (P25) in photocatalytic degradation of methyl blue (MB) under visible-light irradiation. Whereas BTL4 sample exhibited the highest photoactivity with increasing the dosage of Li(OH) to 2 mmol. Furthermore, the absorption edge of the Bi2O3/TiO2 series composites displayed a broad-spectrum photoabsorption from UV to visible-light compared with the individual component. The as-synthesized Bi2O3/TiO2 composites possessed excellent photocatalytic activity and outstanding recyclability. The enhanced photocatalytic efficiency was mainly attributed to the Bi2O3/TiO2 p-n heterojunctions and hierarchical nanostructure. The recombination of photogenerated electron–hole pairs was efficiently suppressed by the Bi2O3/TiO2 p-n heterojunctions.Download high-res image (174KB)Download full-size image
Erbium and nitrogen co-doped SrTiO3 with highly visible light photocatalytic activity and stability by solvothermal synthesis
Co-reporter:Jing Xu, Yuelin Wei, Yunfang Huang, Jing Wang, Xuanqing Zheng, Zhixian Sun, Ying Wu, Xinling Tao, Leqing fan, Jihuai Wu
Materials Research Bulletin 2015 70() pp: 114-121
Publication Date(Web):
DOI:10.1016/j.materresbull.2015.04.027
Solvothermal synthesis nitrogen doped SrTiO3 with high visible light photocatalytic activity
Co-reporter:Jing Xu, Yuelin Wei, Yunfang Huang, Jing Wang, Xuanqing Zheng, Zhixian Sun, Leqing Fan, Jihuai Wu
Ceramics International 2014 Volume 40(Issue 7) pp:10583-10591
Publication Date(Web):August 2014
DOI:10.1016/j.ceramint.2014.03.037

Abstract

Nitrogen (N)-doped SrTiO3 (SrTiO3−xNy) photocatalysts were synthesized by a solvothermal method using Sr(NO3)2·4H2O and Ti(OC3H7)4 as starting materials in KOH solution, hexamethylenetetramine as a source of nitrogen. The physicochemical properties of the photocatalysts were analyzed by Field-Emission Scanning Electron Microscopy (FE-SEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) surface area and ultraviolet–visible spectroscopy (UV–vis). The photocatalytic activity of the SrTiO3−xNy was evaluated by degrading methyl orange (MO) dye under a mercury lamp xenon lamp irradiation, respectively. The results proved that the N doping amount had an important effect on the photocatalytic activity of the catalysts. The pH effects on the photocatalytic degradation were also investigated. The prepared SrTiO3−xNy photocatalyst showed excellent photocatalytic activity for the decomposition of MO under visible-light irradiation, being superior to that of pure SrTiO3 or commercial TiO2 (P25) powders. After five cycles, the photocatalytic activity of the SrTiO3−xNy showed no significant decrease, which indicated that the photocatalysts were stable under visible light irradiation.

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