以蚕丝丝胶(SS)为基材,通过接枝2,5-二硫二脲制备了改性丝胶生物吸附剂(SO),探讨了影响生物吸附的因素,并对比研究了不同体系中生物吸附剂对Ag+的吸附行为.结果表明,在pH 1.0-6.0范围,吸附率随着pH升高而增大.相同条件下,SO吸附容量和吸附率明显优于SS,在单组分Ag+溶液中,pH5.0时,SO和SS对Ag+的吸附率分别为96.2％和57.8％,吸附容量分别为20.8 mg·g.和12.5 mg·g-1.在三组分(Ag+-Cu2+-Zn2+)及五组分(Ag+-Cu2+-Zn2+-Ni2+-pb2+)溶液中,SO对Ag+显示出良好的吸附选择性.pH5.0时,SO对其它金属离子很少吸附,而对Ag+的吸附率分别高达95.8％和93.7％;SS尽管对其它贱金属离子吸附率也较低,但其对Ag+的吸附率仅为25.4％和23.7％.吸附动力学表明,吸附剂对Ag+的吸附符合准二级动力学模型,吸附过程为化学吸附,吸附过程活化能Ea(SO)=43.23 kJ·mol-1,Ea(SS)=59.32 kJ· mol-1.吸附热力学表明吸附过程为放热的自发过程.25℃吸附平衡时,Ag+在固液两相的分配系数为KDθ (SO)=5111.KDθ (SS)=273.SO对Ag+吸附机理主要为配位作用,粒子内扩散为吸附过程的速控步骤.
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