Acta Phys. -Chim. Sin. ›› 1997, Vol. 13 ›› Issue (02): 106-112.doi: 10.3866/PKU.WHXB19970203

• ARTICLE • Previous Articles     Next Articles

Photocatalytic Reduction of Cr6+ ion in the Presence of Organics

Fu Hong-Xiang,Lv Gong-Xuan,Li Shu-Ben   

  1. State Key Laboratory for Oxo Synthesis and Selective Oxidation,Lanzhou Institute of Chemical Physics,Chinese Academy of Science,Lanzhou 730000
  • Received:1996-03-19 Revised:1996-11-05 Published:1997-02-15
  • Contact: Lv Gong-Xuan

Abstract:

Photocatalytic reduction detoxification of Cr6+ ion in TiO2 dispersion, photocatalytic redox synergism in the presence of Cr6+ and some different organics have been studied. The implication for the application of photocatalytic redox decontamination in the real pollution system of co-existed toxic metal ions and organics are presented. The results indicate that Cr6+ can be reduced and detoxified remarkably with TiO2 as catalyst. The reaction atmosphere has negligible ef fect on Cr6+ reduction. Cr6+ reduction is in accord with L-H kinetic equation. Some alcohols, acids and aromatic organics exhibit promotion effects on Cr6+ reduction, but some alkanes and chloro substituted organics exhibit inhibition eff ects. These different effects are mainly dependent on their structure but not number of the carbon atoms, this means that electronic and structural characteristics of different organics are important factors in synergism.

Key words: Cr6+ ion, Photocatalysis, Synergism