凹凸棒石负载壳聚糖吸附废水中Cd_2_的研究_李增新.pdf

第 卷第 期 31 4 Vol.31 No.4 非金属矿 年 月 2008 7 Non-Metallic Mines July, 2008 凹凸棒石负载壳聚糖吸附废水中Cd2+ 的研究 李增新  薛淑云  王 彤  孟 韵 （青岛大学 师范学院化学系，青岛 266071） 摘  要  根据凹凸棒石的离子交换特性和壳聚糖在酸性溶液中带有正电荷，以90% 脱乙酰度壳聚糖为原料，对不同温度活化的凹土作 表面改性，按壳聚糖溶胶与凹土质量比2 ∶1 的比例，制备了凹土负载壳聚糖复合吸附剂。通过对壳聚糖包覆率的测定，确定凹土活化温度在 700 ℃时，其负载率最大为32.6%。吸附废水中Cd2+ 最佳工艺条件是：凹凸棒石- 壳聚糖颗粒吸附剂用量为15g/L ，废水中Cd2+ 质量浓度不大 于200mg/L ，pH 值为6~8，吸附平衡时间为5min ，废水中Cd2+ 去除率为97%。 凹凸棒石黏土 壳聚糖 吸附剂 Cd2+ 关键词        X703 A 1000-8098(2008)04-0057-03 中图分类号： 文献标识码： 文章编号： Adsorption of Cd2+ in Wastewater with Modified Attapulgite-Chitosan Adsorbent Li Zengxin Xue Shuyun Wang Tong Meng Yun (Department of Chemistry, Teachers College of Qingdao University, Qingdao 266071) Abstract In order to offering theory for treatment of Cd2+ pollution wastewater, a compound adsorbent was prepared with the combination of chitosan and attapulgite. Attapulgite was added in chitosan slurry of 90% the degree of deacetylation to prepare adsorbent.The mass ratio of chitosan gel and attapulgite was 2 1. Chitosan loading rate on attapulgite was 32.6% at 700 . Its adsorptivity toward Cd2+ was studied and results show that ∶ ℃ 2+ when the dosage of the adsorbent is 15g/L, the mass concentration of Cd in wastewater does not exceed 200mg/L, the pH value is 6~8, the adsorption equilibrium time is about 5min and Cd2+ removal efficiency is 97