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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 2    April 2003

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Photocatalytic reaction kinetics model based on electrical double layer theory
Ⅲ.Surface complexation model of methyl orange 
adsorption on TiO2 surface
LI Xin-jun(李新军)1, LI Fang-bai(李芳柏)2
GU Guo-bang(古国榜)3, LIU Song(柳 松)3
WANG Liang-yan(王良焱)1

1. Guangzhou Institute of Energy Conversion, 
Chinese Academy of Sciences, Guangzhou 510070, China;
(2. Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of EcoEnvironment and Soil Science, 
Guangzhou 510650, China;
3. Department of Applied Chemistry, 
South China University of Technology, Guangzhou 510640, China

Abstract:Based on the infrared characterization of methyl orange adsorption on TiO2 surface and the titration of TiO2, the triple layer model of methyl orange adsorption on TiO2 was established according to electric double theory. The software FITEQL3.1 was applied to calculate the distribution of organic adsorption on TiO2 surface by introducing dummy components to help to overcome mathematical difficulties. It is shown that the chem. -adsorption species of methyl orange have a great adsorption amount. The adsorption constants of three kinds of surface complexation expressed as SOH+org-,SOH2org2 and SOHorg- are 5.98, 17.57 and -4.2, respectively.

 

Key words:  adsorption; methyl orange; TiO2; surface complexation; photocatalysis

ISSN 1672-7029
CN 43-1423/U

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