K2FeO4协同TiO2光催化降解水中邻苯二甲酸二甲酯

Dimethyl phthalate degradation by TiO2-UV photo-catalysis process combined with K2FeO4

针对邻苯二甲酸二甲酯(DMP)难降解的特性,采用高铁酸盐-光催化的协同工艺降解水中的DMP;研究了不同参数对DMP降解效能的影响;探讨了光催化降解DMP的机理。结果表明,Fe(Ⅵ)-TiO2-UV体系对DMP的降解率明显优于其他2种体系(高铁酸盐体系和TiO2-UV降解体系),说明光催化与高铁酸盐的组合产生明显的协同效应;当DMP初始浓度为5 mg·L-1、pH=9、高铁酸盐和二氧化钛投加浓度分别为31.7 mg·L-1和40mg·L-1时,DMP降解率较高(75%);在Fe(Ⅵ)-TiO2-UV体系光降解DMP过程中,TiO2催化剂表面产生的Fe—O—(有机)络合物会抑制DMP降解,用1%HCl溶液洗涤TiO2,可恢复其活性;用Fe(VI)-TiO2-UV体系降解实际生产废水和模拟废水中DMP,DMP降解率分别为67%和78.2%。高铁酸盐-光催化联合工艺的协同作用极大地提高了DMP的降解率。

Due to the refractory characteristics of dimethyl phthalate(DMP),a combined ferrate-photocatalysis process was used to degrade the DMP in aqueous solution.The effects of different parameters on DMP degradation were studied and the corresponding photo-catalytic degradation mechanism was also investigated.The results shows that the DMP degradation rate by Fe(VI)-TiO2-UV system was significantly better than those of the other two systems(ferrate alone and TiO2-UV),which indicated that the remarkable synergistic effects occurred in the combination of photocatalysis and ferrate.Specifically,when DMP initial concentration was 5 mg·L-1 and pH was 9,the doses of ferrate and titanium dioxide were 31.7 mg·L-1 and 40 mg·L-1,respectively,the DMP degradation rate DMP could reach 75%.During the DMP photodegradation by Fe(Ⅵ)-TiO2-UV system,the Fe—O—(organic)complexes produced on the surface of TiO2 could inhibit its degradation,but the TiO2 activity can be regenerated by washing with 1%HCl solution.For the actual production wastewater and simulated wastewater,the DMP degradation rates with Fe(Ⅵ)-TiO2-UV system were 67%and 78.2%,respectively.The synergistic effect of the combined ferrate-photocatalysis process greatly improved the DMP degradation rate.