磺化酞箐铁-分子筛-二氧化钛复合光催化降解氯苯酚的研究

Iron complex of phthalocyaninesulfonate (FePcS) has been reported to be an efficient catalysis for trichlorophenol degradation by H2O2. The present project aims to combine FePcS catalysis with TiO2 photocatalysis for chlorophenol oxidation by O2. It was found that under visible light irradiation, the target pollutants of phenol, p-chlorophenol, 2,4-dichlorophenol and 2,4,6-trichlorophenol could be degraded effectively in an aerated aqueous solution of FePcS. However, the catalyst was also photobleached gradually in situ. By further studies, other MPcS could also function as such a catalyst. The reaction efficiency and the photostability of MPcS were observed to be affected strongly by the central metal and the aggregation properties of the complex, and were also of temperature dependence. The reactions above are mainly initiated by singlet oxygen, that is formed from O2 reaction with excited MPcS, leading to complete oxidation of chlorophenols into CO2 and chloride ions. In TiO2 photocatalysis, we propose an adsorption model and have observed firstly the effect of light intensity on the apparent adsorption constant. The comparison with POM(polyoxometalate) photocatalysis and the reverse effect of ferric ions are also made in this report. The reaction mechanisms are discussed including the structure importance of organic substrate in Fe (III) photolysis and POM photocatalysis.

磺化酞菁铁配合物能显著催化过氧化氢氧化水中氯苯酚，本项目将以二氧化钛光催化取代过氧化氢，研究设计复合型催化体系。使二氧化钛负载与分子筛外表面光催化产生过氧化氢等物质，使配合物处于分子筛孔内催化过氧化氢氧化氯苯酚，协同加速和提高其去除效率。该项目对于寻求一体系多方法处理难降解有机物的环保新技术，也会具有重要的应用价值。