降解水中有机毒物的新型反应体系研究

利用空气中的氧电化学合成H₂O₂,制备具有较高电流效率的空气电极.将空气电极用于构成降解有机毒物的新型反应体系电化学氧化体系、光激发氧化剂氧化体系和光电-Fenton氧化体系.实验测量了H₂O₂在不同体系不同条件下的分解速率,并与相应的传统式体系作了比较.实验测量了苯胺在新型体系中的矿化反应速率,发现H₂O₂的分解速率与苯胺的矿化速率有良好的平行关系,其中H₂O₂分解速率最快的光电-Fenton体系是氧化降解有机分子的最佳体系.通过光电-Fenton体系和光-Fenton体系的比较,揭示了空气电极/溶液界面在光电-Fenton体系中所起的重要作用.初步讨论了苯胺分子在光电-Fenton体系中矿化反应的机制.

A Novel Reaction System to Degradation of Organic Toxicants in Water

The carbon-PTFE O 2(air)-Fed cathode with a high current efficiency was prepared on which H 2O 2 was electro-generated by using O 2 in air. It was used to degrade the organic toxic contaminants in the new type reaction system-electrochemical oxidation system, photo-excitation oxidant system and the photoelectro-Fenton system. The decomposition rate of H 2O 2 was measured in different systems under different conditions and was compared with the traditional system. The reaction rate of aniline to mineral was measured in the new type systems, and the results indicated the decomposition rate of H 2O 2 has an excellent parallel relation with the degradation rate of aniline, when the carbon-PTFE O 2 (air)-Fed worked in suit successively. Besides, the best system to degrade the organic molecule was the photoelectro-Fenton system, in which H 2O 2 was decomposed fastest. By comparing with photoelectro-Fenton system and photo-Fenton system, it reveals the important role of interface between the carbon-PTFE O 2(air)-Fed cathode and solution in photoelectro-Fenton system. In this paper, we also discuss the mechanism of aniline to mineral in photoelectro-Fenton system.