Effect of dye-metal complexation on photocatalytic decomposition of the dyes on TiO2 under visible irradiation.
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+ was discussed from the different roles of surface-adsorbed and dye-coordinated Cu2+ in the photodegradation of dyes.
Mahmood
Tariq
T
Beijing National Laboratory for Molecular Sciences, Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Chen
Chuncheng
C
Liu
Lili
L
Zhao
Dan
D
Ma
Wanghong
W
Lin
Jun
J
Zhao
Jincai
J
D000880:Anthraquinones / Q000737:chemistry*; D001391:Azo Compounds / Q000737:chemistry*; D002384:Catalysis / Q000528:radiation effects; D003300:Copper / Q000737:chemistry*; D008027:Light; D009282:Naphthalenesulfonates / Q000737:chemistry*; D010782:Photolysis / Q000528:radiation effects*; D013057:Spectrum Analysis; D014025:Titanium / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
D000880:Anthraquinones; D001391:Azo Compounds; D009282:Naphthalenesulfonates; C508261:acid chrome blue K; C009495:titanium dioxide; C010078:alizarin; D003300:Copper; D014025:Titanium; D015032:Zinc