纳米Fe_3O_4@壳聚糖材料的制备及吸附性能的研究

Preparation and Adsorption Properties of Nano-Fe_3O_4@ Chitosan

以废弃的虾壳为原料制备壳聚糖,以壳聚糖为壳、磁性Fe_3O_4为核、液体石蜡为分散剂、T-80为乳化剂、戊二醛为交联剂制备了纳米Fe_3O_4@壳聚糖材料。利用扫描电镜、热重分析仪、红外光谱仪、X射线衍射仪对其进行了表征。结果显示,纳米Fe_3O_4@壳聚糖材料为表面光滑的球形结构,直径约75.82nm,壳聚糖和Fe_3O_4的质量比为2∶1。吸附动力学实验研究表明,纳米Fe_3O_4@壳聚糖材料对Cu^(2+)吸附符合准二级动力学,以化学吸附为主,平衡吸附容量为17.32mg/g。吸附等温线实验研究表明,吸附符合Freundlic模型,纳米Fe_3O_4@壳聚糖材料与Cu^(2+)之间的交互作用强烈,最大吸附容量为213.68mg/g。

Chitosan was prepared from waste shrimp shell,and then nano-Fe3O4@ chitosan material was prepared by using chitosan as shell,magnetic Fe3O4 as core,liquid paraffin as dispersant,T-80 as emulsifier and glutaraldehyde as crosslinking agent. The prepared nano material was characterized by IR,SEM,TG,and XRD. The results showed that the surface of nano-Fe3O4@ chitosan are smooth and spherical,the mass ratio of chitosan to Fe3O4 is 2∶ 1 and the diameter is about 75. 82 nm. Adsorption kinetic experiment showed that the Cu^2＋ adsorption of nanoFe3O4@ chitosan corresponds to pseudo-second-order kinetic,which implies a dominant chemical adsorption. The equilibrium adsorption capacity was 17. 32 mg/g. Adsorption isotherm experiment showed that the adsorption conforms to the Freundlic adsorption isotherm model,and there is strong interaction between nano-Fe3O4@ chitosan and Cu^2＋. The maximum adsorption capacity was 213. 68 mg/g.