壳聚糖改性膨润土修复土壤镉污染的研究  

Adsorption of Cadmium (Ⅱ) in Soil with Modified Bentonite-Chitosan Adsorbent

作　　者：李增新[1] 王彤[1] 黄海兰[1] 张道来[2] 孟韵[1] 

机构地区：[1]青岛大学师范学院化学系,山东青岛266071 [2]国家海洋局第一海洋研究所,山东青岛266071

出　　处：《土壤通报》2009年第1期176-178,共3页Chinese Journal of Soil Science

基　　金：山东省中青年科学家科研奖励基金(2008BS09001)

摘　　要：为利用膨润土原位修复镉污染土壤提供理论依据,根据膨润土离子交换特性和壳聚糖在酸性溶液中带有正电荷,将膨润土与90%脱乙酰度壳聚糖的0.5%醋酸溶液混合,使壳聚糖负载在膨润土上,制成颗粒吸附剂,用于吸附溶液中Cd2+。最佳工艺条件是:壳聚糖与膨润土质量比为1:20,颗粒吸附剂用量为15gL-1,溶液中Cd2+质量浓度不大于200mgL-1,pH值为6～8,吸附平衡时间为8min,Cd2+去除率为99%。In order to offering a theory for treatment of cadmium （ Ⅱ ） pollution soil, a compound adsorbent was prepared with the combination of chitosan and bentonite. Bentonite was added in chitosan slurry of 90% of deacetylation to prepare adsorbent. The mass ratio is 1 ： 1.2. Its adorability towards Cd^2＋ was studied and results showed that the dosage of the adsorbent was 15g L^-1, the mass concentration of Cd （Ⅱ） in wastewater did not exceed 200mg L^-1, the pH value was 6-8, the adsorption equilibrium time was about 8 min and Cd （Ⅱ） removal efficiency was 99%.

关 键 词：土壤污染治理 膨润土 壳聚糖 吸附剂 镉离子 

分 类 号：X53[环境科学与工程—环境工程]