铁酸钴/壳聚糖核壳磁性微球吸附Cr^(6+)的研究  

Study on the Adsorption of Cr^(6+) by Co-ferrites/Chitosan Core-shell Magnetic Microspheres

作　　者：李鹏[1] 李晓飞[2] 黄绍洁[2] 

机构地区：[1]重庆市环境监测中心,重庆401147 [2]四川大学建筑与环境学院,四川成都610061

出　　处：《安徽农业科学》2008年第9期3846-3847,共2页Journal of Anhui Agricultural Sciences

摘　　要：[目的]利用壳聚糖的吸附性开发废水溶液中Cr6+的去除技术。[方法]采用戊二醛交联壳聚糖制备包覆铁酸钴磁性微球,并用其吸附废水中的Cr6+。用二苯碳酰二肼分光光度法测定溶液中的Cr6+浓度,进而计算Cr6+的去除率。[结果]Cr6+去除率先随pH值的增加而增加,当pH值约为6时,对Cr6+的去除效果最好,pH值继续增加时,去除效果降低。Cr6+去除率随着时间的增加而增加,140 min以后,去除率趋于平稳。Cr6+去除率随吸附剂用量的增加而增加,而且效果明显,超过0.7 g,去除率不再显著提高。[结论]虽然交联后的磁性壳聚糖对Cr6+的吸附性能低于活性碳,但它具有磁分离效果好、吸附快、无二次污染、便于回收利用等优点。[ Objective] The aim of the study was to develop the removal technique of Cr^6＋ in waste water by utilizing the adsorption of chitosan. [ Method] The coated Co-ferrite magnetic microspheres were prepared by cross linkage of glutaraldehyde and chitosan and used to adsorbing Cr^6＋ from water. The diphenylcarbohydrazide spectrophotometry was used to determine Cr^6＋concn. in the solution, and then the removal rate on Cr^6＋ was calculated out. [ Result] The removal rate on Cr^6＋ increased along with the increment of pH value. When pH value was about 6, the removal effect on Cr^6＋ was best, but when pH value went on increasing, the removal effect reduced.The removal rate on Cr^6＋ increased along with the increment of time, after 140 min, the removal rate tended to be stable. The removal rate on Cr^6＋ increased along with the increment of absorbent dose and the effect was significant, but since the dose exceeded 0.7 g, the removal rate no longer increased significantly. [ Conclusion] Though the adsorption performance of cross-linked magnetic chitesan on Cr^6＋ was lower than that of activated carbon, it had advantages such as magnetic separation, fast adsorption, no secondary pollution and convenient recycling.

关 键 词：壳聚糖/铁酸钴 六价铬 吸附 

分 类 号：X824[环境科学与工程—环境工程]