Environmental catalysis and materials

Effect of dye-metal complexation on photocatalytic decomposition of the dyeson TiO2 under visible irradiation

MAHMOOD Tariq , CHEN Chuncheng , LIU Lili , ZHAO Dan , MA Wanghong , LIN Jun , ZHAO Jincai


Received March 05, 2008,Revised April 16, 2008, Accepted , Available online

Volume 21,2009,Pages 263-267

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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 e ect 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 di erent e ect of Cu2+ was discussed from the di erent roles of surface-adsorbed and dye-coordinated Cu2+ in the photodegradation of dyes.

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