有机蒙脱石负载纳米铁去除4-氯酚的研究  

Investigation on the removal of 4-chlorophenol using nanoscale zero-valent iron supported on organomontmorillonite

作　　者：刘凯[1,2] 庞志华[3] 李小明[1,2,4] 谌建宇[3] 罗隽[3] 

机构地区：[1]湖南大学环境科学与工程学院,长沙410082 [2]环境生物与控制教育部重点实验室(湖南大学),长沙410082 [3]环境保护部华南环境科学研究所,广州510655 [4]广西大学环境学院,南宁530004

出　　处：《环境科学学报》2011年第12期2616-2623,共8页Acta Scientiae Circumstantiae

基　　金：水体污染控制与治理国家重大科技专项(No.2008ZX07211-004)~~

摘　　要：采用离子交换法制备了有机改性蒙脱石(CMt),以此为载体和分散剂,通过液相还原过程成功制备出负载型纳米零价铁颗粒(NZVI-CMt),并对其结构利用XRD、SEM等手段进行表征.同时,借助高效液相色谱法(HPLC)分析研究了不同条件下合成材料对4-氯酚(4-CP)的去除情况,并对降解机理进行了探讨.结果表明:制备出的负载型纳米零价铁颗粒分散性良好,粒径在1～100nm范围内;25℃条件下,30min内NZVI-CMt对初始浓度为10mg·L-1的4-CP可达到90%的去除效果,合成材料能应对不同浓度4-CP的冲击并保持优良的去除率;NZVI-CMt对4-氯酚的去除作用包括吸附和降解两种途径,温度对去除途径的选择有明显影响;NZVI-CMt对4-CP的优良吸附性有利于Fe0的传质,进而增强了4-CP的降解效果.Organomontmorillonite（CMt） prepared by ion exchange method was used as carrier and dispering agent for synthesizing Nanoscale zero-valent iron（NZVI）,by adopting aqueous reducing technique.The NZVI（NZVI-CMt） was characterized by XRD and SEM.The removal rate of 4-chlorophenol by NZVI-CMt was investigated under different conditions.In addition,the degradation mechanism of 4-chlorophenol was discussed.The experimental results demonstrated that the supported NZVI was well-dispersed,with a particle size range of 1~100 nm.When the initial concentration of 4-chlorophenol was 10 mg · L^-1,the removal rate by NZVI-CMt reached 90% after 30 min under 25 ℃.In addition,the NZVI-CMt performed good removal efficiency as the 4-CPs concentration varied.In this process 4-CPs were removed by two pathways,adsorption and degradation.Temperature was an important factor influencing the removal pathway.With excellent absorbability,NZVI-CMt enhanced the effect of 4-CPs degradation by raising the efficiency of mass transmission of Fe0.

关 键 词：有机蒙脱石 负载型纳米铁 4-氯酚 吸附 还原 

分 类 号：X703.1[环境科学与工程—环境工程]