Effect of dye-metal complexation on photocatalytic decomposition of the dyes
on TiO2 under visible irradiation |
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| Authors: | MAHMOOD Tariq CHEN Chuncheng LIU Lili ZHAO Dan MA Wanghong LIN Jun and ZHAO Jincai |
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| Institution: | 1. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
2. Department of Chemistry, Renmin University of China, Beijing 100872, China |
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| Abstract: | 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 dye-metal ratios.The relative chemical inert Zn2+ tended to enhance the photodegradation of both anionic dyes.The mechanism underlying the different effect of Cu2+ is discussed from the different roles of surface-adsorbed and dye-coordinated Cu2+ in the photodegradation of dyes. |
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| Keywords: | photocatalysis degradation of dye pollutants metal ions TiO2 |
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