Z壳聚糖交联印迹材料对稀土中Cu(Ⅱ)的选择吸附性能

Selective Adsorption Property of Chitosan Crosslinked Imprinted Materials towards Cu(Ⅱ) in Rare Earth

以羧甲基壳聚糖(CMC)为原料,Cu(Ⅱ)为模板离子,环氧氯丙烷(ECH)为交联剂,制得交联印迹材料Cu-ECMC。研究了该材料对模板离子的结合性能与识别选择性。探讨了溶液的pH值、吸附时间等因素对该材料吸附性能的影响。结果表明,材料Cu-ECMC对Cu(Ⅱ)可产生吸附作用,最大吸附量达到44.3mg·g^(-1);pH=3.0时,相对于La(Ⅲ),对Cu(Ⅱ)的选择性系数可达到15.57。印迹材料对铜离子的吸附符合准二级动力学模型。

In this work, the cross-linked imprinted materials Cu-ECMC with Cu （lI） ions in sulfate solution as template was prepared by using carboxymethyl chitosan as raw material and epichlorohydrin as cross-linking agent. The binding properties and recognition selectivity of the template ion were studied, and various adsorption factors were further studied, including initial pH value and adsorption time. The results show that the Cu-ECMC towards Cu（Ⅱ ） ions can produce strong adsorption, the maximum adsorption capacity is 44.3mg·g-l; pH= 3. 0, with respect to the La（Ⅲ）, selectivity coefficient of Cu（Ⅱ） is 15.57. The adsorption behavior of Cu2＋ on Cu-ECMC can be well described by the Pseudo-second order model.