有机物存在下Cr^(6+)离子的光催化还原

Photocatalytic Reduction of Cr^(6+) ion in the Presence of Organics

选择多种有机物，对Cr(6+)离子与有机物共存污染体系的光催化氧化还原协同作用研究，得出了光催化应用于消除有毒金属离子与有机污染物共存实际体系的有关信息．在酸性条件下，TiO2对Cr6+离子污染具有显著的光催化还原消除效果，还原气氛对反应影响不大，Cr6+离子的光催化还原符合L-H动力学规律．不同有机物存在表明，醇、酸及某些芳香有机物对Cr6+的光但化还原具有明显的促进作用，而一些烷烃及氯代烷烃则表现出一定的阻抑作用．这种不同影响与有机物结构紧密相关，而与其所含碳数关系不大．

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 fartors in synergism.