TY - JOUR ID - TI - Effect of dye-metal complexation on photocatalytic decomposition of the dyes on TiO2 under visible irradiation AU - MAHMOOD Tariq AU - CHEN Chuncheng AU - LIU Lili AU - ZHAO Dan AU - MA Wanghong AU - LIN Jun and ZHAO Jincai VL - 21 IS - 2 PB - SP - 263 EP - 267 PY - JF - Journal of Environmental Sciences JA - J. Environ. Sci. UR - http://www.jesc.ac.cn/jesc_en/ch/reader/view_abstract.aspx?file_no=2009210221&flag=1 KW - photocatalysis; degradation of dye pollutants KW - metal ions; TiO2 AB - 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. ER -