基于吸附质-分子探针的阴离子聚合物微球吸附性能研究

Study on adsorption properties of anion polymer microspheres based on adsorbate-molecular probe

制备了SO42-、NO3-、ClO4-和F-、Cl-、Br-、I-两种新型阴离子苯乙烯-二乙烯苯聚合物微球,基于吸附质-分子探针电导法,研究了阴离子聚合物吸附低浓度游离酸的性能,考察了阴离子类型和温度对吸附行为的影响。实验结果表明,在30℃时,吸附游离酸的过程,遵循单分子层机理进行吸附。吸附剂-吸附质相互作用能U制约表观吸附速率常数K,两者存在线性相关性,K、U均随阴离子的离子势增大呈逐渐减小的趋势。吸附过程为吸热的,吸附焓变ΔH为10.87 kJ.mol-1。吸附过程谱维数ds增大,导致表观吸附速率常数降低。吸附质对吸附剂的亲和能Ua随吸附质-吸附剂相互作用参数K2增大而减小。

Two types of novel anion polymer microspheres with SO 4 2、NO 3 、ClO 4 and F 、Cl 、Br 、I anions had been prepared.With the help of adsorbate-molecular probe electric conductance method,the adsorption properties of low concentration free acid and adsorption behavior with two types of anions and temperature were studied.The results showed that the adsorption of low concentration free acid with novel anion polymer microspheres followed the monomolecular adsorption mechanism at 30℃.The apparent adsorption rate constant K restricted the interaction energy U between adsorbent-adsorbate.And there existed some linear correlation between the K and U,they were gradually decreased along with the ionic potential increases.The adsorption process was endothermic,and the enthalpy ΔH of adsorption was 10.87 kJ.mol-1.The fractal dimension d s decrease,resulting in lower apparent adsorption rate constant.When the affinity energy U a from adsorbate to adsorbent decreased,as the increase of adsorbent-adsorbate interaction parameter K 2.