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Synthesis and characterization of mesoporous Bi/TiO2 nanoparticles with high photocatalytic activity under visible light

Published online by Cambridge University Press:  10 May 2013

Ximiao Zhu ,
Zhang Liu ,
Jianzhang Fang ,
Shuxing Wu  and
WeiCheng Xu
Ximiao Zhu
Affiliation:
School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China
Zhang Liu
Affiliation:
School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China
Jianzhang Fang*
Affiliation:
School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China
Shuxing Wu
Affiliation:
School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China
WeiCheng Xu
Affiliation:
School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China
*
a)Address all correspondence to this author. e-mail: fangjzh@scnu.edu.cn
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Abstract

Under the strategies of doping to extend the absorptive response region of a semiconductor and fabricating a mesoporous structure with large specific surface area to enhance the photocatalytic property, an efficient visible-light-driven photocatalyst of bismuth-doped titanium dioxide (Bi/TiO2) was prepared via a facile sol-gel route. The resulting materials were characterized by powder x-ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric analysis (TG), UV–vis diffuse reflectance spectrum (DRS), and N2 adsorption–desorption measurements (BET). The photocatalytic performances of as-synthesized particles were monitored by degradation of 2,4-dichlorophenol (2,4-DCP) in transparent aqueous solutions under visible light illumination. The results revealed that mesoporous PEG-modified Bi-doped TiO2 exhibited much higher photocatalytic activities than Bi-doped TiO2 without modification, and noticeably the optimized doping level was increased from 2 to 4 mol%. The visible-light photocatalytic activity enhancement of PEG-modified Bi-doped TiO2 could be attributed to appropriate proportional mixed crystal phase, large surface area, porosity, mesoporous network with interconnected small nanocrystals, and its strong absorption in the visible region.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 10 , 28 May 2013 , pp. 1334 - 1342
Copyright
Copyright © Materials Research Society 2013 

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