Photocatalytic reaction kinetics model based on electrical double layer theory¢ó.Surface complexation model of methyl orange adsorption on TiO₂ surface

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ÎÄÕÂÒ³Â룺448 - 451

Key words£ºadsorption; methyl orange; TiO₂; surface complexation; photocatalysis

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.