Photodegradation mechanism of two dyes:the influence of adsorption behavior on the novel TiO2 particles

Abstract： The relationship between adsorption behavior and photocatalytic mechanism of the two dyes wasinvestigated. Adsorption isotherms showed that the adsorption of cationic pink FG was Langmuir type behavior,while the reactive brilliant red k-2G was Freundlich type behavior. The increasing pH favored the adsorption of FGbut have little effect on the photodegradation. The increasing pH favored the adsorption and the photodegradation ofradicals scavenger tetranitromethane inhibited the photodegradation of FG. These results indicated that thephotodegradation of FG mainly via free radicals in solution, and the photodegradation of k-2G was mainly on theeffect of SO2-4 , HCO-3 on the adsorption and photodegradation of two dyes confirmed these results. 作 者： LI Wei    Wang Yi-zhong   作者單位： State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China  期 刊： 環(huán)境科學(xué)學(xué)報(英文版)  ISTICSCI   Journal： JOURNAL OF ENVIRONMENTAL SCIENCES  年，卷(期)： 2004, 16(2)  分類號： X79 X13  Keywords： photodegradation mechanism    adsorption behavior    dye   

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