改性壳聚糖对水中镉的吸附影响因素的研究

Study on Effects of Modified Chitosan on Adsorption of Cadmium in Aqueous Solution

以戊二醛为交联剂,将β-环糊精交联到壳聚糖大分子链上,制备出新型环境功能吸附材料壳聚糖交联β-环糊精(CTS-CD),并研究了CTS-CD对水中镉的吸附研究。实验结果表明,CTS-CD对镉的吸附受溶液pH的影响较大,吸附效果在pH=5左右时最佳,当含镉水溶液初始浓度小于10 mg/L时,2. 5 h吸附趋于平衡;当初始浓度大于20 mg/L时,4. 5 h吸附趋于平衡,平衡吸附容量趋于定值,其数值为121 mg/g。

Chitosan-β-cyclodextrinpolymer（ CTS-CD）,a kind of new environmental functional adsorption material,was synthesized by immobilizing-β-cyclodextrin（ β-CD） onto the molecular structure of chitosan with the crosslinking function of glutar-aldehyde. The adsorption properties of cadmium on CTS-CD in water were investigated. The experiments showed that the solution pH significantly influenced the adsorption capacity. The optimum pH value of the adsorption condition was about 5. When the initial concentration of cadmium aqueous solution was less than 10 mg/L,adsorption tended to equilibrium after 2. 5 h,when the initial concentration of cadmium aqueous solution was more than20 mg/L,adsorption tended to equilibrium after 4. 5 h,and the saturated adsorption capacity of cadmium on CST-CD was121 mg/g.