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TiO2 hydrosols with high activity for photocatalytic degradation of formaldehyde in a gaseous phase

文献类型： 外文期刊

作者： Liu, Tong-xu 4 ; 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, Peoples R China

2.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China

3.Hong Kong Polytech Univ, Dept Civil & Struct Engn, Hong Kong, Hong Kong, Peoples R China

4.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

关键词： air purification;formaldehyde;TiO2 hydrosol;photocatalytic activity

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 152 卷 1 期

页码：

收录情况： SCI

摘要： Two types of TiO2 hydrosols (TOSO and HTO) were prepared from titanium sulfate (TiOSO4) and metatitanic acid (H2TiO3) by a chemical precipitation-peptization method, respectively. The prepared hydrosols were characterized by means of X-ray diffraction, particle size distribution, scanning electron microscopy, UV-vis spectroscopy, Fourier transform infrared spectroscopy, Brunauer-Emmett-Teller and Barret-Joyner-Halender methods. The results showed that the TiO2 hydrosols with an anatase crystal structure had smaller particle sizes, higher surface areas, larger pore volume, and higher transparence than Degussa P-25 suspension. The photocatalytic activity of the TiO2 hydrosols was evaluated for formaldehyde degradation under UVA illumination in a gaseous phase. The results demonstrated that the photocatalytic activity with the catalyst loading of 2 mg cm(-2) was ranked as an order of HTO > TOSO > P-25. The photocatalytic activity was further studied using the HTO catalyst under different experimental conditions. The results showed that catalyst loading, relative humidity, and initial concentration could influence the efficiency of HCHO photocatalytic degradation. It was found that a catalyst loading of more than 2 mg cm(-2) and a relative humidity of 55% were two essential conditions for achieving the best performance under these experimental conditions. The repeated experiments indicated that the HTO catalyst was reasonably stable and could be repeatedly used for the HCHO oxidation under UVA irradiation. This investigation would be helpful to promote the application of TiO2 photocatalytic technique for indoor air purification. (c) 2007 Elsevier B.V. All rights reserved.

  • 相关文献

[1]Effects of peptizing conditions on nanometer properties and photocatalytic activity of TiO2 hydrosols prepared by H2TiO3. Liu, Tong-xu,Li, Fang-bai,Liu, Tong-xu,Li, Xiang-zhong,Liu, Tong-xu. 2008

[2]Enhanced photocatalytic activity of Ce3+-TiO2 hydrosols in aqueous and gaseous phases. Liu, Tong-xu,Li, Xiang-zhong,Liu, Tong-xu,Li, Fang-bai. 2010

[3]The effect of iron oxides and oxalate on the photodegradation of 2-mercaptobenzothiazole. Liu, CS,Li, FB,Li, XM,Zhang, G,Kuang, YQ.

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