Wan Ngah W S, Kamari A, Koay Y J
School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia.
Int J Biol Macromol. 2004 Jun;34(3):155-61. doi: 10.1016/j.ijbiomac.2004.03.001.
The adsorption of Cu(II) ions from aqueous solution by chitosan and chitosan/PVA beads was studied in a batch adsorption system. Chitosan solution was blended with poly(vinyl alcohol) (PVA) in order to obtain sorbents that are insoluble in aqueous acidic and basic solution. The adsorption capacities and rates of Cu(II) ions onto chitosan and chitosan/PVA beads were evaluated. The Langmuir, Freundlich and BET adsorption models were applied to describe the isotherms and isotherm constants. Adsorption isothermal data could be well interpreted by the Langmuir model. The kinetic experimental data properly correlated with the second-order kinetic model, which indicates that the chemical sorption is the rate-limiting step. The Cu(II) ions can be removed from the chitosan and chitosan/PVA beads rapidly by treatment with an aqueous EDTA solution. Results also showed that chitosan and chitosan/PVA beads are favourable adsorbers.
在间歇吸附系统中研究了壳聚糖和壳聚糖/聚乙烯醇（PVA）珠对水溶液中Cu(II)离子的吸附。将壳聚糖溶液与聚乙烯醇（PVA）混合，以获得在酸性和碱性水溶液中均不溶的吸附剂。评估了Cu(II)离子在壳聚糖和壳聚糖/PVA珠上的吸附容量和速率。应用朗缪尔、弗伦德利希和BET吸附模型来描述等温线和等温常数。吸附等温线数据可以用朗缪尔模型很好地解释。动力学实验数据与二级动力学模型具有良好的相关性，这表明化学吸附是限速步骤。通过用EDTA水溶液处理，可以快速从壳聚糖和壳聚糖/PVA珠中去除Cu(II)离子。结果还表明壳聚糖和壳聚糖/PVA珠是良好的吸附剂。
