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以壳聚糖为包覆材料,采用花状Y2O3颗粒作为内核,制备有机-无机复合材料壳聚糖-氧化钇复合吸附剂。并通过扫描电镜(SEM)、透射电镜(TEM)、红外光谱(IR)的方法对复合材料进行表征。考察了pH值对吸附行为的影响并对吸附机理进行了分析。相关系数表明,拟二级模型可以更准确地模拟吸附动力学,说明该吸附过程主要由化学吸附控制。Langmuir等温线与实验数据拟合度较高。通过对吸附热力学参数进行分析,发现该吸附过程可以自发进行,是吸热反应。
Using chitosan as coating material and flower-like Y2O3 particles as inner core, an organic-inorganic composite chitosan-yttrium oxide composite adsorbent was prepared. The composites were characterized by SEM, TEM and IR. The effect of pH on the adsorption behavior was investigated and the adsorption mechanism was analyzed. The correlation coefficient shows that quasi-second-order model can more accurately simulate the adsorption kinetics, indicating that the adsorption process is mainly controlled by chemisorption. The Langmuir isotherm fitted well with the experimental data. By analyzing the adsorption thermodynamic parameters, we found that the adsorption process can spontaneously be an endothermic reaction.