Zn2＋离子印迹Fe3 O4-壳聚糖纳米粒子的制备及对Zn2＋吸附性能的研究

摘要

采用一步共沉淀法，以Zn2＋为模板，戊二醛为交联剂制备了磁性Fe3 O4-壳聚糖纳米印迹粒子，分别用X-射线衍射、傅里叶红外光谱、热重分析等手段对该纳米印迹粒子进行结构和性能表征，利用原子吸收光谱研究pH，Zn2＋初始浓度，温度等对其吸附性能的影响，并探讨了其对不同重金属离子的吸附选择性．实验结果表明：壳聚糖很好地包覆在纳米粒子表面，且未改变Fe3 O4的尖晶石结构；纳米粒子中壳聚糖的含量约为10．2％；pH ＝6为较理想的吸附条件，当 Zn2＋初始浓度为200 mg/L 时，单位吸附量最大，约为28．9 mg/g；降低温度有利于吸附的进行．印迹粒子能够较好地选择性吸附锌离子．%Fe3 O4-chitosan (CTS)imprinted nanoparticles were prepared by one-step coprecipitation using Zn2+as template and glutaraldehyde as a crosslinking agent.The nanoparticles were characterized by X-ray diffraction (XRD),Fourier transform infrared spectroscopy (FTIR)and thermo gravimetric analysis (TG) respectively.The effect of pH,initial concentration of Zn2+and temperature on adsorption of Zn2+was also studied by atom adsorption spectroscopy (AAS)and finally the adsorption of various heavy metal ions was discussed.The results showed that the nanaoparticles were successfully covered with chitosan,and their original spinel structure hadn’t changed.The amount of chitosan was about 10.2%(wt).The suitable pH was 6.When the initial concentration of Zn2+was 200 mg/L,the adsorption capacity reached its maximum value which was about 28.9 mg/g.Decreasing temperature benefited the adsorption process and the nanop-articles showed selective adsorption of zinc ions.