交联淀粉微球吸附Pb~(2+)的研究

以可溶性淀粉为原料,N,N′-亚甲基双丙烯酰胺为交联剂,采用反相悬浮聚合制备了交联淀粉微球。用原子吸收分光光度计测吸附后的Pb2+质量浓度,计算得到吸附量。研究交联淀粉微球对Pb2+的吸附行为,得出吸附量与吸附时间、酸碱度、吸附剂用量、初始溶液质量浓度之间的关系。结果表明,同样条件下,交联淀粉对Pb2+的吸附性能优于未交联淀粉,交联淀粉微球对Pb2+吸附行为同时符合Langmiur和Freundlich吸附等温方程,也符合一级动力学模型和二级动力学模型。

Adsorption of Pb2+ to Cross-linked Starch Microspheres

Cross-linked starch microspheres were prepared by the inverse suspension and polymerization of soluble starch, and the cross-linking agent was N,N′-Methylenebisacrylamide. Absorbance was measured by atomic absorption spectrophotometer, the concentration of Pb^2＋ could be got and the adsorption capacity could be calculated. The performance of cross-linked starch microspheres in adsorbing lead （ Ⅱ ） ion was studied, and the relationship between time, pH, adsorbent dosage, initial concentration and adsorption capacity was determined. Results show that the adsorption performance of cross-linked starch is better than non cross-linked one under the same condition. And the performance of cross-linked starch microspheres adsorbing lead （Ⅱ ） ion suits not only with the Langmiur and Freundlich isotherm equation, but also with the first and second order dynamic model.