聚乙烯醇/壳聚糖共混膜的制备及对Cu2+的吸附研究

摘要

A PVA/Chitosan blend membrane was prepared from chitosan(CS) and polyvinyl alcohol(PVA), and it adsorbed Cu2+ in CuSO4 solution.The paper discussed about the influence of adsorption temperature,initial concentration of CuSO4 solution,pH value of concentration of CuSO4 solution and adsorbing time on the adsorption capacity of Cu2+ and also the mechanism of adsorbing Cu2+ was illustrated.Results showed that high adsorption temperature, initial concentration and pH value of CuSO4 solution and long adsorption time were favorable for the adsorption of Cu2+ in a certain range.The Freundlich isotherm could describe the adsorption behavior of Cu2+ and the pseudo-second-order kinetic model might provide better correlation for the experimental results.%以聚乙烯醇(Polyvinyl Alcohol,PVA) 和壳聚糖(Chitosan,CS)为原料制备了一种共混膜,用该共混膜吸附CuSO4溶液中的Cu2+.探讨了吸附温度、CuSO4溶液的浓度、CuSO4溶液的pH值和吸附时间对共混膜吸附Cu2+量的影响,并讨论了该膜吸附Cu2+的机理.结果表明,在一定范围内,较高的吸附温度、较高的CuSO4溶液浓度和pH值以及较长的吸附时间均有利于PVA/CS共混膜对Cu2+的吸附.用Langmuir吸附等温模型和准二级动力学模型描述该共混膜对Cu2+的吸附行为时,它们具有较好的相关性.