【摘要】 以Fe(Ⅲ)离子交换改性膨润土,制得一种多相Fenton催化剂;以4-氯苯酚为模型污染物,研究不同反应条件的影响。结果表明,复合催化剂主要含SiO2及α-Fe2O3两种晶型,Fe是以高催化活性的α-Fe2O3形式存在。复合催化剂在H2O2及紫外光的协同作用下,经60 min反应后对4-氯苯酚的降解率约100%,TOC去除率约70%,且其循环使用性能较好。在实际操作过程中,控制溶液体系的pH值为6以及H2O2与4-氯苯酚浓度比约15较为适宜;在4-氯苯酚的降解过程中,C—Cl键持续断裂,Cl-被释放出来,降解过程生成了一些不含氯的中间产物。更多还原

【Abstract】 A heterogeneous Fenton catalyst Fe(Ⅲ)-bentonite was prepared.Influences of experimental parameters were studied using 4-chlorophenol as model pollutant.The XRD pattern of heterogeneous Fenton catalyst shows absorption peaks corresponding to α-Fe2O3 and SiO2 evidently,and iron element is in the form of α-Fe2O3 that has high catalytic activity.The degradation ratio of 4-chlorophenol and TOC with photo and H2O2 assisted can be as high as 100% and 70% after 60 min reaction,it is appropriate to control pH value and the ratio of [H2O2]/[4-CP] to be 6 and 15,respectively.The broken of C—Cl bond starts simultaneous as the degradation of 4-chlorophenol,and the degradation process forms some intermediate without chlorine element.更多还原