进入环境的纳米材料对共存化学污染物的环境行为有重要影响.本文选择3种多壁碳纳米管,分别为石墨化多壁碳纳米管(G-MWCNT)、羟基化多壁碳纳米管(O-MWCNT)和氨基化多壁碳纳米管(N-MWCNT),通过批次实验研究其对林丹的吸附行为和催化转化作用.林丹在3种多壁碳纳米管上的吸附动力学符合准二级动力学模型(R2＞0.997),吸附速率常数(k2)分别为0.73(G-MWCNT)、0.60(N-MWCNT)和0.28(O-MWCNT)g·mg-1·h-1.林丹在3种多壁碳纳米管上吸附的等温线符合Freundlich经验模型(R2＞0.979),不同pH条件下,吸附系数(KF)分别为28.0-30.0(G-MWCNT)、21.3-24.6 (N-MWCNT)和9.1-10.2(O-MWCNT) mg1-n·Ln·g-1.平衡浓度为8.5 mg·L-1,在不同pH条件下林丹在3种多壁碳纳米管上的分配常数(Kd)分别为12.7-14.4(G-MWCNT)、8.7-9.8(N-MWCNT)和3.9-4.2(O-MWCNT)L·g-1.林丹是非离子型有机化合物,疏水作用在吸附过程中起主导作用,表面引入亲水性强的氨基和羟基后,N-MWCNT和O-MWCNT的吸附作用相比具有疏水性表面的G-MWCNT明显减弱.溶液的pH值(5.0-9.0)对同种多壁碳纳米管的吸附作用影响不显著.均相溶液中,林丹发生β-消去反应的准一级动力学表观速率常数kobs(0.017-10.2 d-1)随溶液pH值(7.0-12.0)升高而增大.N-MWCNT对林丹发生β-消去反应起催化作用,这种催化作用随pH值(7.0-9.0)升高而增强.当N-MWCNT存在时,林丹的去除率分别增加了7.5％(pH=7.0)、29.3％(pH=8.0)和30.1％(pH=9.0).在均相溶液和N-MWCNT体系中都检测到γ-1,3,4,5,6-五氯环己烯、1,2,4-三氯苯和1,2,3-三氯苯转化产物.
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