壳聚糖季铵盐磁性颗粒的制备及其对甲基橙的吸附效果

Preparation of Magnetic Quaternary Chitosan Salt and Its Adsorption of Methyl Orange from Water

首先在甘氨酸盐酸盐离子液体([Gly]Cl)水溶液中制备了不同取代度的壳聚糖季铵盐,采用共沉淀法制备了纳米Fe3O4.进而以Fe3O4为核,戊二醛作交联剂,通过反相悬浮法制备交联壳聚糖季铵盐磁性颗粒,考察了反应条件对吸附效果的影响.并采用静态吸附法研究了磁性颗粒对甲基橙(MO)的吸附效果.结果表明,在25℃,pH=3的条件下,甲基橙初始浓度从20 mg.L-1增加到150 mg.L-1时,平衡吸附量从37.45 mg.g-1增加到277.5 mg.g-1.运用相关数学模型拟合实验数据得出,该吸附符合Freundlich模型,吸附动力学符合拟二级动力学模型.经4次重复使用后磁性颗粒对甲基橙的吸附率仍高于90%.

First,quaternary chitosan salts with different substitution degrees were prepared in glycine hydrochloride（Cl） ionic liquid.Nano-sized Fe3 O4 powder was obtained through chemical co-precipitation method.And then,magnetic quaternary chitosan particles were prepared through inverse suspension cross-linking using Fe3 O4 as the nucleus and glutaraldehyde as the cross-linking agent.The influence of different reaction conditions on adsorption was discussed.Adsorption of methyl orange（MO） by magnetic quaternary chitosan particles was studied through the static adsorption method.The results showed that at pH 3.0 and 25℃ the adsorption capacity varied from 37.45 mg·g^-1 to 277.5 mg·g^-1 with the MO concentration ranging from 20 mg·L^-1 to 150 mg·L^-1.The adsorption isotherm was fitted to the Freundlich model and the adsorption kinetics was fitted to the pseudo-second order kinetic isotherms capacity experiment.It was found that after the adsorbent was used for four times,its removal rate still exceeded 90%.