Fe_3O_4-膨润土作为电Fenton催化剂用于降解橙黄G

Research on Fe_3O_4-bentonite as electric Fenton catalyst applied to the degradation of orange G

采用聚四氟乙烯(PTFE)-炭黑(CB)修饰的石墨毡(GF)为阴极,铂片为阳极,500 mL 0.05 mol/L的Na_2SO_4溶液为电解液组成的电Fenton体系降解橙黄G。考察了3种催化剂支撑材料(硅藻土、高岭土和膨润土)的特性,并利用表面生长Fe_3O_4法制备了催化剂。对20 mg/L橙黄G的降解结果表明,Fe_3O_4-膨润土为最佳催化剂;在最佳催化剂作用下,当pH为3,电流密度为50 A/m^2,催化剂投加量为1.0 g/L,通电时间为40 min时,电Fenton体系对橙黄G的去除率达到95.34%。

The degradation process of orange G has been researched,using the electric Fenton system which consisted of polytetrafluoroethylene（PTFE）-carbon black（CB） modified graphite felt（GF） as cathode,platinum plate as anode,and 500 m L 0.05 mol/L of Na2SO4 solution as electrolyte. The characteristics of three kinds of catalyst supporting materials（diatomaceous,kaolin and bentonite）,are investigated. The catalysts have been prepared by surface growing Fe3O4 method. The result from the degradation of 20 mg/L of organic G shows that Fe3O4-bentonite is con-firmed to be the best catalyst. Under the effect of optimal catalyst,when pH is 3,current density 50 A/m2,catalyst dosage 1.0 g/L,and conduction time 40 min,the removing rate of orange G by the electro-Fenton system reaches 95.34%.