中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 13 No. 2 April 2003 |
Ⅲ.Surface complexation model of methyl orange
adsorption on TiO2 surface
（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
