壳聚糖交联树脂的制备及对Cu(Ⅱ)吸附性能的研究

Preparation of chitosan crosslinked resin and its adsorption of Cu (Ⅱ)

摘要: 为有效去除饮用水中重金属离子的污染,以戊二醛作为交联剂,采用壳聚糖制备新型交联树脂,并对其结构进行表征。以Cu(II)作为重金属离子模板,研究了交联树脂在不同铜离子浓度、pH和温度条件下对铜离子的吸附量的变化,并通过红外光谱表征交联树脂吸附铜离子前后的结构变化。研究结果表明,交联树脂在铜离子浓度为20g/L,pH为3.5,温度为70℃时吸附量最大,达到510mg/g。红外光谱表明戊二醛交联剂的羰基基团与壳聚糖的胺基基团发生了Schiff碱反应,交联树脂与铜离子发生了螯合反应。

Abstract: The novel crosslinked chitosan resin was synthesized and characterized using glutaraldehyde as crosslinking agen for pollutant removal of heavy metal ions in drinking water. Effects of adsorption conditions, such as the concentration of copper, pH value and the temperature on the adsorption quantity of Cu (II) were studied. The crosslinked chitosan resin, and after adsorption with Cu (II) by crosslinked resin were characterized by FTIR. The result showed that the adsorption of Cu (II) reached the maximum 510mg/g at the concentration of copper 20g/L, pH3.5 and 70℃. IR ananlysis showed that Schiff base reaction occurred between the carbonyl group of glutaraldehyde and amine group of chitosan and the chelate reaction occurred between the chitosan and copper (II) .