Effect of dye-metal complexation on photocatalytic decomposition of the dyes on TiO_2 under visible irradiation  

作　　者：MAHMOOD Tariq CHEN Chuncheng LIU Lili ZHAO Dan MA Wanghong LIN Jun ZHAO Jincai 

机构地区：[1]Beijing National Laboratory for Molecular Sciences, Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China [2]Department of Chemistry, Renmin University of China, Beijing 100872, China

出　　处：《Journal of Environmental Sciences》2009年第2期263-267,共5页环境科学学报（英文版）

基　　金：supported by the Ministry of Science and Technology of China (No. 2007AA061402);the National Natural Science Foundation of China (No. 20537010,20772129);the Chinese Academy of Sciences.

摘　　要：The photocatalytic degradation of dyes （Acid Chrome Blue K （ACBK） and Alizarin Red （AR）） with strong complexation ability was investigated in the presence of metal ions under visible light irradiation. It was found that, at low dye-metal ratio, the photodegradation of ACBK was markedly inhibited by the addition of high oxidative potential Cu2＋. However, at high dye-metal ratio, the presence of Cu2＋ enhanced the photodegradation of ACBK. The negtive effect of Cu2＋ on the photodegradation of AR was observed for all dyemetal ratios. The relative chemical inert Zn2＋ tended to enhance the photodegradation of both anionic dyes. The mechanism underlying the different effect of Cu2＋ was discussed from the different roles of surface-adsorbed and dye-coordinated Cu2＋ in the photodegradation of dyes.The photocatalytic degradation of dyes （Acid Chrome Blue K （ACBK） and Alizarin Red （AR）） with strong complexation ability was investigated in the presence of metal ions under visible light irradiation. It was found that, at low dye-metal ratio, the photodegradation of ACBK was markedly inhibited by the addition of high oxidative potential Cu2＋. However, at high dye-metal ratio, the presence of Cu2＋ enhanced the photodegradation of ACBK. The negtive effect of Cu2＋ on the photodegradation of AR was observed for all dyemetal ratios. The relative chemical inert Zn2＋ tended to enhance the photodegradation of both anionic dyes. The mechanism underlying the different effect of Cu2＋ was discussed from the different roles of surface-adsorbed and dye-coordinated Cu2＋ in the photodegradation of dyes.

关 键 词：PHOTOCATALYSIS degradation of dye pollutants  metal ions TiO2 

分 类 号：X703[环境科学与工程—环境工程]