Photocatalytic degradation of methyl orange in water by samarium-doped TiO2

被引：26

作者：

Shi, Jianwen ^{[1
,2
]}

Zheng, Jingtang ^{[1
]}

Hu, Yan ^{[1
]}

Zhao, Yucui ^{[1
]}

机构：

[1] China Univ Petr, State Key Lab Heavy Oil, Dongying 257061, Shandong, Peoples R China

[2] Chinese Acad Sci, Inst Urban Environm, Xiamen 361003, Fujian, Peoples R China

来源：

ENVIRONMENTAL ENGINEERING SCIENCE | 2008年 / 25卷 / 04期

关键词：

titanium dioxide; sol-gel preparation; photocatalytic activity; degradation;

D O I：

10.1089/ees.2007.0048

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A series of Sm-doped TiO2 nanoparticles were prepared by the sol-gel method and characterized with X-ray diffraction (XRD), transmission electron microscope (TEM), and ultraviolet-visible diffuse reflectance spectra (DRS). Their photacatalytic activities were studied by photodegradation methyl orange in water under UV and simulant solar light irradiation, respectively. The results showed that Sm doping led to the crystal expansion and matrices distortion. Sm doping restrained a crystal size increase, which was beneficial for transportation and exchanges of organic and productions; furthermore, redounds to photogenerated carriers shifting to the surface of photocatalyst and preventing the recombination of the carriers, and then improving the photocatalytic activity. Appropriate concentration Sm doping induced the absorption profile red-shift of TiO2, which made Sm-doped TiO2 possess high catalyst activity under simulant solar light irradiation whose major emission was the focus on the visible light region. Sm doping was an effective means to improve the photocatalystic activity of TiO2 for degradation methyl orange in water whether under UV or solar light irradiation.

引用

页码：489 / 496

页数：8

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