聚乙烯醇/壳聚糖共混膜的制备及对Cu^(2+)的吸附研究

Preparation of PVA/Chitosan Blend Membrane and Study on Adsorption Behavior of Cu^(2+)

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CuSO_4溶液中的Cu^(2+)。探讨了吸附温度、CuSO_4溶液的浓度、CuSO_4溶液的pH值和吸附时间对共混膜吸附Cu^(2+)量的影响,并讨论了该膜吸附Cu^(2+)的机理。结果表明,在一定范围内,较高的吸附温度、较高的CuSO_4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Cu^(2+)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Cu^(2+)的吸附行为时,它们具有较好的相关性。

A PVA/Chitosan blend membrane was prepared from ehitosan（CS） and polyvinyl alcohol （PVA）, and it adsorbed Cu^2＋ 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 Cu^2＋ and also the mechanism of adsorbing Cu^2＋ 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 Cu^2＋ in a certain range. The Freundlich isotherm could describe the adsorption behavior of Cu^2＋ and the pseudo-second-order kinetic model might provide better correlation for the experimental results.