活性白土/壳聚糖复合物对多成分污染物的吸附行为研究  

Study on the adsorption behaviors of activated clay/chitosan composite on the multi-component pollutant

作　　者：徐启杰[1] 赵梦溪[1] 潘庆才[1] 张昕[1] 吴俊鹏[1] 

机构地区：[1]黄淮学院化学化工系,河南驻马店463000

出　　处：《应用化工》2016年第10期1908-1912,共5页Applied Chemical Industry

基　　金：河南省科技攻关项目(132102110183;142102310217);驻马店市科技攻关项目(15025;13140;14324)

摘　　要：用十六烷基三甲基溴化铵(CTAB)作为修饰剂对活性白土进行修饰,将改性后的活性白土与壳聚糖混合并加入定量硅烷偶联剂,通过溶液插层技术制备活性白土/壳聚糖复合材料。通过红外光谱(FTIR)、热重分析(TG)、X-射线衍射分析(XRD)和透射电子显微镜分析(TEM)对所制备的活性白土/壳聚糖复合物进行表征。结果表明,硅烷偶联剂与活性白土形成了稳定的结构,十六烷基三甲基溴化铵和壳聚糖显著提高了活性白土的片层间距,有利于提高复合物的吸附性能。将制得的复合物对Fe^(3+)、Cu^(2+)以及NO_2^-溶液进行吸附研究,探讨了吸附温度、吸附时间、吸附pH、吸附剂用量以及被吸附物质浓度对吸附性能的影响。研究结果显示,活性白土/壳聚糖复合物对3种物质均有较好的吸附效果,其中对NO_2^-的吸附率达79.20%,对Cu^(2+)的吸附率达99.98%,对Fe^(3+)的吸附率达92.59%。The activated clay was modified by using surfactant cetyl trimethyl ammonium bromide（ CTAB）as modifier. Furthermore,the activated clay / chitosan composite was prepared by using the modified activated clay and chitosan as intial materials where the quantitative silane coupling agent was added into the reaction system to modify the activated clay. As-obtained composite was characterized by infrared spectrometer（ FTIR）,thermogravimetric analyzer（ TG）,X-ray diffraction（ XRD） and transmission electron microscopy（ TEM）. The results showed that silane coupling agent and active clay formed a stable structure,moreover,cetyl trimethyl ammonium bromide and chitosan significantly increased the lamellar spacing of activated clay,thereby improving the adsorption properties of activated clay / chitosan composite. The activated clay / chitosan composite used as adsorbent pocessed perfect adsorption properties to Fe^3＋,Cu^2＋and NO2-solution were studied,with which the effects of the adsorption conditions cluding the adsorption temperature,adsorption time,p H value of the solution,the adsorbent dosage were researched on the adsorption rate of activated clay / chitosan composite. The results showed that the activated clay / chitosan composite possessed perfect adsorption properties to three kinds of ions of Fe^3＋,Cu^2＋and NO2-thereby the adsorption rate of NO2-was 79. 20%; the adsorption rate of Cu^2＋ was 99. 98%; the adsorption rate of Fe^3＋was 92. 59%.

关 键 词：活性白土 壳聚糖 复合吸附剂 废水 吸附性能 

分 类 号：TQ171.9[化学工程—玻璃工业]