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利用滴加法合成了球形含Ni2+交联壳聚糖,并通过胺化引入大量活性氨基,再经除镍制成对重金属镍离子具有较好吸附能力的新型吸附剂[P-C-CTS(Ni)].通过Ni2+吸附容量的测定,IR及XPS分析,验证了合成技术路线的正确性.通过研究pH值对吸附量的影响,初步讨论了无柠檬酸根(Cit)配位体存在时,吸附剂对Ni(II)的吸附为螯合作用.通过Cit存在条件下(cNi=cCit=0.852mmol·L-1),吸附剂对Ni(II)离子和Cit的吸附量随pH值的变化,结合相应pH值下金属镍的形态分布,探讨了其对Ni(II)的吸附机理,研究认为不仅仅是简单的螯合作用,其吸附机理和吸附量与溶液中金属离子的存在形式有关,引入静电吸附原理解释了吸附剂对Ni(II)的吸附现象.
A new absorbent [PC-CTS (Ni)] with spherical Ni2 + -containing cross-linked chitosan and a large amount of active amino groups was introduced by the addition of nickel and then adsorbed to nickel (Ⅱ) .According to the determination of the adsorption capacity of Ni2 +, IR and XPS analysis, the correctness of the synthetic route was verified.By investigating the effect of pH value on the adsorption capacity, the effect of adsorbent pair on the presence of citrate- The adsorption of Ni (II) was chelated by the presence of Cit (cNi = cCit = 0.852mmol·L-1), the adsorption capacity of Ni (II) pH value of nickel metal form distribution, to explore its Ni (II) adsorption mechanism, the study considered not only a simple chelating effect, the adsorption mechanism and the amount of adsorption and the presence of metal ions in solution, the introduction of static electricity Adsorption principle explains the adsorption of Ni (II) on the sorbent.