Fe_2O_3/凹凸棒土吸附-光催化法处理间氯甲苯工业废水研究  

The study on treatment of m-chlorobenzene-containing waste water by adsorption-photocatalysis method with iron oxide/attapulgite

作　　者：张倩萍[1] 李广超[1] 朱亦仁[1] 

机构地区：[1]徐州师范大学化学化工学院,江苏徐州221116

出　　处：《精细与专用化学品》2011年第9期14-18,共5页Fine and Specialty Chemicals

基　　金：徐州师范大学大学生实践创新训练计划项目;徐州师范大学学生科研课题(XSKT2011134);徐州市科技计划项目(XJ08070)

摘　　要：采用酸化法对凹凸棒土进行改性,考察改性条件、投加量、吸附时间以及废水pH值等因素对吸附效果的影响。在盐酸浓度为4mol/L,煅烧温度为200℃时,在最佳吸附条件(改性凹凸棒土投加量0.500g/25mL,废水pH=4,吸附时间1h)下,吸附法处理染料中间体间氯甲苯废水,COD的去除率由改性前的2.2%提高到14.1%。采用浸渍法制备纳米Fe_2O_3/凹凸棒土复合催化剂并对其表征,XRD分析结果表明,该复合物中光催化剂主要由α-Fe_2O_3构成;用凹凸棒土吸附-光催化氧化联合法处理间氯甲苯工业废水,在催化剂加入量为1.0g/L,pH=2,紫外光或太阳光照6h条件下,废水COD去除率分别达到59.2%和52.3%。复合催化剂的光催化活性要远大于纯纳米α-Fe_2O_3的光催化活性。Attapulgite was modified by acidification,and main factors such as modification condition,dosage, solution pH value and time of adsorption were studied for adsorption efficiency of attapulgite.Under optimum adsorption conditions（dosage of modified attapulgite was 0.500g/25mL,waste water pH = 4,and time of adsorption was 4h）,with a HCl concentration of 4mol/L and a calcination temperature of 400℃,the removal rate of COD was improved from 2.2%to 14.1%.Nano-iron oxide/attapulgite was synthesized by maceration,and then characterized by X-ray diffraction（XRD）.Experiment results showed that the composite photocatalyst was mainly consisted ofα-Fe2O3.In addition,When treating m-chlorobenzne containing waste water by iron oxide /attapulgite adsorption-photocatalysis method,the removal rate of COD could reach 59.2%and 52.3%when the dosage of catalyst was 2.Og/L,pH = 2,and the time of ultraviolet radiation or sunlight was 6h.The results indicated that the photocatalytic activity of composite photocatalyst was much better than using nanoα-Fe2O alone.

关 键 词：复合型光催化剂 凹凸棒土 Α-FE2O3 吸附 光催化 

分 类 号：X703[环境科学与工程—环境工程]