以壳聚糖为原料,戊二醛为交联剂制备交联壳聚糖凝胶,并对凝胶的溶胀性能及Ni2+吸附效果进行研究.实验结果表明,交联剂用量越大,交联密度越高,但是凝胶网络弹性降低,溶胀性变差;弱酸至中性条件有利于凝胶的溶胀,交联改性能降低壳聚糖的溶胀热敏温度,降低后期吸附Ni2+的能耗.用1％的戊二醛交联壳聚糖处理20、40 mg/L Ni2+电镀废水,投加60 mg交联改性壳聚糖,在30℃、pH =7条件下吸附3h,吸附率分别达96.9％和92.4％,吸附过程可用一级动力学模型进行模拟.废水经过二次吸附后出水水质均能达到0.01 mg/L Ni2+的《污水综合排放标准》(GB3838)标准,交联改性壳聚糖的重复使用性好,多次循环使用后依然具有很好的吸附效果.
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