(1. 深圳職業(yè)技術(shù)學(xué)院 建筑與環(huán)境工程學(xué)院，深圳 518055；2. 深圳清華大學(xué)研究院，深圳 518057)
摘 要: 以Fe(Ⅲ)離子交換改性膨潤土，制得一種多相Fenton催化劑；以4-氯苯酚為模型污染物，研究不同反應(yīng)條件的影響。結(jié)果表明，復(fù)合催化劑主要含SiO2及α-Fe2O3兩種晶型，Fe是以高催化活性的α-Fe2O3形式存在。復(fù)合催化劑在H2O2及紫外光的協(xié)同作用下，經(jīng)60 min反應(yīng)后對4-氯苯酚的降解率約100%，TOC去除率約70%，且其循環(huán)使用性能較好。在實際操作過程中，控制溶液體系的pH值為6以及H2O2與4-氯苯酚濃度比約15較為適宜；在4-氯苯酚的降解過程中，C?/FONT>Cl鍵持續(xù)斷裂，Cl?被釋放出來，降解過程生成了一些不含氯的中間產(chǎn)物。
關(guān)鍵字: 膨潤土；多相光催化劑；4-氯苯酚；降解
（1. School of Construction and Environmental Engineering, Shenzhen Polytechnic, Shenzhen 518055, China;2. Research Institute of Tsinghua University in Shenzhen,Shenzhen 518057, China）
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.
Key words: bentonite; heterogeneous photocatalyst; 4-chloropheno; degradation
