磁性壳聚糖凝胶微球对水中Pb(Ⅱ)的吸附性能

以壳聚糖为原材料，通过原位共沉淀法和柠檬酸钠交联法制备了一种新型多孔磁性壳聚糖凝胶微球吸附剂CS-citrate/Fe₃O₄.利用扫描电镜（SEM）、透射电镜（TEM）、傅里叶红外光谱（FTIR）、热重分析（TG）对吸附剂进行了表征.结果表明，吸附剂内部具有发达的孔隙结构，并均匀分布有平均直径为（4.79±1.09）nm的Fe₃O₄纳米颗粒；吸附剂中引入Fe₃O₄后，仍存在羟基、氨基和羧基等功能基团，且吸附剂磁性良好可用于磁场分离；吸附剂对Pb（Ⅱ）的吸附等温线和动力学研究表明，吸附过程以化学吸附为主，最大吸附容量可达178.25mg/g.

Adsorption properties ofmagnetic chitosan hydrogelmicrospheres to Pb(II) from aqueous solutions

In this study, the magnetic porous chitosan hydrogel microsphere was fabricated by a combination of in situ-coprecipitation and sodium citrate crosslinking technique using chitosan as raw material. The scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TG) were conducted for the characterization of this novel adsorbent. The hydrogel microsphere present a well developed porous inner structure and the Fe₃O₄nanoparticles with an average diameter of (4.79±1.09) nm dispersed uniformly. The functional group of chitosan, the hydroxyl, amino and carboxyl groups, remained after the introduction of the Fe₃O₄, and the magnetic adsorbent could be separated by the addition of external magnetic field. The adsorption isotherm and kinetic study for the Pb (Ⅱ) removal from the aquatic environment indicating that the adsorption process was dominated by the chemical adsorption and the maximum adsorption capacity was calculated as 178.25mg/g.