铁酸钴/壳聚糖核壳磁性微球吸附Cr~(6+)的研究

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。

Study on the Adsorption of Cr6+ by Co-ferrites/Chitosan Core-shell Magnetic Microspheres

Objective] The aim of the study was to develop the removal technique of Cr6 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 Cr6 from water.The diphenylcarbohydrazide spectrophotometry was used to determine Cr6 concn.in the solution,and then the removal rate on Cr6 was calculated out.Result] The removal rate on Cr6 increased along with the increment of pH value.When pH value was about 6,the removal effect on Cr6 was best,but when pH value went on increasing,the removal effect reduced.The removal rate on Cr6 increased along with the increment of time,after 140 min,the removal rate tended to be stable.The removal rate on Cr6 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 chitosan on Cr6 was lower than that of activated carbon,it had advantages such as magnetic separation,fast adsorption,no secondary pollution and convenient recycling.