壳聚糖改性凹凸棒土对重金属离子的吸附  

Adsorption of Heavy Metal Ions on Attapulgite Modified by Chitosan

作　　者：殷竟洲[1] 杨文澜[1] 夏士朋[1] 

机构地区：[1]淮阴师范学院化学系

出　　处：《化工环保》2007年第3期276-279,共4页Environmental Protection of Chemical Industry

摘　　要：采用浸渍法将壳聚糖负载在凹凸棒土上,制备了改性的凹凸棒土。用该吸附剂吸附溶液中Pb2+,Cd2+的实验结果表明:未负载壳聚糖时,凹凸棒土对Cd2+的吸附率为55%;当负载壳聚糖的质量分数为0.04时,凹凸棒土对Cd2+的吸附率达最大值(为91%),对Pb2+的吸附率也达最大值(为75%)。其吸附行为符合Langm u ir等温吸附方程和Freund lich等温吸附方程。该吸附剂可重复使用。The modified attapulgite was prepared by charging chitosan on attapulgite using impregnation method. The experimental results of adsorbing Pb^2＋ and Cd2＋ in solution are as follows： The adsorption efficiency of Cd^2＋ on attapulgite without chitosan is 55% ; When the mass fraction of chitosan is 0.04, the adsorption efficiencies of Cd^2＋ and Pb^2＋ on modified attapulgite are the maximums （91% and 75% respectively ）. The adsorption behaviors of modified attapulgite accord with Langmuir and Freundlich isothermal adsorption equations. The adsorbent is reusable.

关 键 词：壳聚糖 凹凸棒土 铅离子 镉离子 吸附 

分 类 号：O636.1[理学—高分子化学] X730[理学—化学]