Enhanced visible photocatalytic activity of titania-silica photocatalysts: effect of carbon and silver doping

doi:10.1039/c2cy00545j

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	Enhanced visible photocatalytic activity of titania-silica photocatalysts: effect of carbon and silver doping
	Chen, Qifeng 1,3; Shi, Huijuan 1,2; Shi, Weimei 1,2; Xu, Yao 1; Wu, Dong 1
刊名	CATALYSIS SCIENCE & TECHNOLOGY
	2012
卷号	2 期号:6 页码:1213-1220
ISSN号	2044-4753
DOI	10.1039/c2cy00545j
英文摘要	To utilize efficiently visible light in photocatalytic reactions, a series of doped TiO2 photocatalysts were synthesized via a facile solvothermal method. The photocatalysts were characterized with various techniques. The results indicated that all the photocatalysts were of an anatase phase, the Ag0.010C2.0-TS0.20 sample possessed the largest surface area (306.0 m(2) g(-1)) and pore volume (2.05 cm(3) g(-1)). The carbon dopant existed in the surface layer of the TiO2-SiO2 composite and narrowed the energy band gap, which induced visible light absorption. Silver existed on the particle surface and in two forms, Ag+ and Ag-0, which acted together to inhibit the recombination of photogenerated electrons and holes. The photoactivities were evaluated by decomposition of RhB under visible irradiation. It was found that the Ag-C/TS photocatalyst exhibited the highest visible photoactivity, with the molar ratios of Ag-Ti, and C-Ti of 0.005, and 2.0, respectively, corresponding to the reaction rate constant 2.09 h(-1). The reaction rate was 52.3, 11.2 and 2.33 times higher than that of TiO2 (0.04 h(-1)), Ag-0.005-TiO2 (0.186 h(-1)) and C-2.0-TiO2 (0.897 h(-1)), respectively. The enhanced visible photocatalytic activity can be attributed to the synergetic effects of silver and carbon doping, as well as silicon introduction. The photocatalytic reaction mechanism was verified with ESR technique; furthermore, both the hydroxyl radical and superoxide radical played a critical role on the photocatalytic reaction, in addition, DMPO-H-center dot was found in the ESR experiments.
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000304106900018
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/49071]
专题	中国科学院化学研究所
通讯作者	Chen, Qifeng
作者单位	1.Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Key Lab Photochem, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Chen, Qifeng,Shi, Huijuan,Shi, Weimei,et al. Enhanced visible photocatalytic activity of titania-silica photocatalysts: effect of carbon and silver doping[J]. CATALYSIS SCIENCE & TECHNOLOGY,2012,2(6):1213-1220.
APA	Chen, Qifeng,Shi, Huijuan,Shi, Weimei,Xu, Yao,&Wu, Dong.(2012).Enhanced visible photocatalytic activity of titania-silica photocatalysts: effect of carbon and silver doping.CATALYSIS SCIENCE & TECHNOLOGY,2(6),1213-1220.
MLA	Chen, Qifeng,et al."Enhanced visible photocatalytic activity of titania-silica photocatalysts: effect of carbon and silver doping".CATALYSIS SCIENCE & TECHNOLOGY 2.6(2012):1213-1220.