β-环糊精微球对染料分子吸附作用研究

Study on the adsorbability of microspheres containing β-CD onto dyes

以环氧氯丙烷为交联剂,采取反相乳液聚合得到β-环糊精微球(EPI-β-CD),经丁二酸酐酰化后得到微球表面具有羧基的β-环糊精微球(SUC-EPI-β-CD),分别采用红外光谱、扫描电镜和激光粒度分析仪表征了其结构及形貌特征。选择染料亚甲基蓝(MB)和甲基橙(MO)作为模型分子,考察了所合成微球的吸附性能。结果表明:由于β-CD与两种染料分子的相互作用力不同,微球EPI-β-CD吸附亚甲基兰染料的能力强于甲基橙;两种微球对MB的吸附等温数据与Freundlich方程拟合较好,且均为优惠吸附;羧丁基酰化β-环糊精微球(SUC-EPI-β-CD)表现出较明显的pH敏感性。

Microspheres containing β-CD （EPI-β-CD） were prepared by inverse emulsion polymerization using epiehlorohydrin （EPI） as crosslinker,and then ,the butanedioyl mierospheres containing β-CD （SUC-EPI-β-CD） were synthesized by acylation using suceinic anhydride as aeylating agent. The structure and morphology of the mierospheres were characterized using infrared spec- troscopy, scanning electron microscopy and laser particle size analyzer. The adsorption of the mierospheres was studied using methylene blue （MB） and methyl orange dye as model moleculars. The results indicated that adsorption capacity of （EPI-β-CD） microspheres to MB were higher than MO due to the difference of interaction force between β-CD and two dyes;The adsorption isotherm data for MB were well correlated with Freundlich adsorption isotherm equations and possessed higher adsorption capacity. In addition,the adsorption capacity of microspheres （SUC-EPI-β-CD） showed obviously pH sensitivity.