Effects of peptizing conditions on nanometer properties and photocatalytic activity of TiO2 hydrosols prepared by H2TiO3
文献类型： 外文期刊
作者： Liu, Tong-xu 1 ; Li, Fang-bai 1 ; Li, Xiang-zhong 3 ;
作者机构： 1.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Guangdong, Peoples R China
2.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China
3.Hong Kong Polytech Univ, Dept Civil & Struct Engn, Kowloon, Hong Kong, Peoples R China
4.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
关键词： formaldehyde;metatitanic acid;methyl mercaptan;peptizing conditions;TiO2 hydrosol
期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：10.588； 五年影响因子：10.129 ）
ISSN： 0304-3894
年卷期： 2008 年 155 卷 1-2 期
页码：
收录情况： SCI
摘要： TiO2 hydrosols were prepared from metatitanic acid (H2TiO3) by chemical precipitation-peptization method under various peptizing conditions. The effects of peptizing conditions on nanosized properties and photocatalytic activity of TiO2 hydrosols were investigated. The crystal structure, crystallinity, particle size distribution, and transparency (T%) of as-obtained hydrosols were characterized by means of X-ray diffraction, transmission electron microscopy, light-scattering size analyzer, and UV-vis transmittance spectra. The results showed that the properties of hydrosols depended on peptizing conditions including a molar ratio of H+/Ti, temperature, and solid content. The photoactivity of TiO2 hydrosols was evaluated in terms of the degradation of rhodamine B (RhB) in aqueous solution, and formaldehyde (HCHO) and methyl mercaptan (CH3SH) in gaseous phase. The results showed that increase in H+/Ti ranging 0.19-0.75 led to the decrease in particle size and the increase in transparency. With increasing of temperature, particle sizes increased while the transparency and photoactivity decreased steadily when the temperature was higher than 65 C. The particle size, transparency and photoactivity of the hydrosols hardly depended on solid content when it was not less than 2%. It should be confirmed that the hydrosols with higher crystallinity, smaller particle size and higher transparency could have the higher photoactivity for the degradation of RhB, CH3SH, and HCHO. In this study, the optimal peptizing conditions were determined to be H+/Ti=0.75, temperature =65 degrees C and solid content =2-6%. (c) 2007 Elsevier B.V. All rights reserved.
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