光谱法分析晶须表面离子印迹对镉的吸附行为

以Cd(Ⅱ)离子为模板分子，壳聚糖为功能单体，3-缩水甘油醚氧丙基三甲氧基硅烷(KH-560)作为交联剂同时加入一定量的三钛酸钠晶须合成了新型的三钛酸钠晶须表面Cd(Ⅱ) 离子印迹聚合物吸附剂，通过电感耦合等离子体原子发射光谱法(ICP-AES)研究了此离子印迹聚合物对Cd(Ⅱ)的吸附行为; 探讨了酸度、吸附剂用量，静置时间对吸附行为的影响，同时研究了印迹聚合物对Cd(Ⅱ)的吸附动力学和吸附等温线，得出此吸附属Langmuir吸附模型。根据吸附效率系数(K_d)和选择性系数(K)的大小，考察了离子印迹聚合物的吸附选择性。试验结果表明：在最佳优化条件下，离子印迹聚合物对Cd(Ⅱ)的吸附率可达99%以上，最大吸附容量为52.34 mg·g-1，选择性优于空白印迹聚合物，此方法的检出限为0.024 μg·mL-1，相对标准偏差为1.74%(c=1.0 μg·mL-1, n=13)说明此离子印迹聚合物适用于环境中水样的Cd(Ⅱ)的选择性吸附。

Analysis of Properties of Cadmium Adsorption onto Whisker Surface Ion-Imprinted Polymer by Inductively Coupled Plasma Atomic Emission Spectrometry

A new type of surface ion-imprinted polymer was synthesized in aqueous media with sodium trititanate whisker in the presence of CA(Ⅱ),chitosan and γ-glycidoxypropyl trimethoxysilane (KH-560).A batch of adsorption experiments were performed to evaluate its adsorption of Cd(Ⅱ) using inductively coupled plasma atomic emission spectrometry (ICP-AES).The factors affecting adsorption capacity,including pH and sorbent amount,were discussed.The adsorption kinetics and adsorption isothermals were also obtained.The Langmuir isotherm can fit in the experimental equilibrium data.Under the optimum conditiona,the value of the adsorption was above 99%,and the maximum adsorption capacity was 52.34 mg·g~(-1).In accordance with the parameters distribution coefficient (K_d) and selectivity coefficient (K),the selectivity for Cd(Ⅱ) of the prepared imprinted polymer was estimated.Finally,the adsorption mechanism was discussed and the detection limit of 0.024 μg·mL~(-1) with the relative standard deviation (RSD) of 1.74% (c=1.0 μg·mL~(-1),n=13) for CA(Ⅱ) was obtained.Results showed that the surface Cd(Ⅱ)-imprinted polymer was a solid sorbent with high efficiency,low-cost,convenient separation/enrichment for environmental trace Cd(Ⅱ).