β-环糊精-纤维素基超交联微球吸附分离苯乙酮和1-苯乙醇

Adsorptive separation of acetophenone and 1-phenylethanol byβ-cyclodextrin-cellulose based hypercrosslinked microspheres

将苄基化β-环糊精引入到纤维素接枝聚苯乙烯复合微球上,制备了一种β-环糊精-纤维素基超交联微球(HCCM),并用于吸附分离苯乙酮(AP)和1-苯乙醇(PE)。通过FTIR、N_(2)吸附-脱附、SEM和TEM对其进行了表征。结果表明,HCCM是由大量的糖单元和富苯基单元交织形成的具有多级孔结构的生物质基聚合微球,比表面积为471.20 m^(2)/g。在25℃,初始质量浓度为2000 mg/L的单组分溶液中对HCCM吸附分离AP/PE的性能进行了测试。间歇式吸附很快达到吸附平衡,HCCM对AP的吸附量为291.7 mg/g,明显高于对PE的吸附量(138.2 mg/g)。准二级动力学模型和Freundlich模型能更好地描述吸附过程,吸附过程存在化学吸附。双组分连续式吸附实验中,PE较AP提前穿透,穿透间隔时间较长,且HCCM对两者的吸附具有较高的分离因子(3.93),说明HCCM能有效分离AP/PE。HCCM经重复使用5次仍保持吸附量不变,说明其具有良好的循环使用性。

β-Cyclodextrin-cellulose based hypercrosslinked microspheres(HCCM)was prepared by introducing benzylationβ-cyclodextrin onto cellulose grafted polystyrene composite microspheres and used for acetophenone(AP)and 1-phenylethanol(PE)adsorption and separation.The structure of HCCM was characterized by FTIR,N_(2) adsorption desorption,SEM and TEM.The results showed that HCCM was a biomass-based polymer microsphere with hierarchically porous structure composed of a large number of sugar units and phenyl rich units,and displayed a specific surface area of 471.20 m^(2)/g.The performance of HCCM for the adsorption and separation of AP/PE was analyzed firstly in a single component solution with an initial concentration of 2000 mg/L at 25°C.The adsorption could quickly reach equilibrium,with an adsorption capacity for AP of 291.7 mg/g much higher than that for PE(138.2 mg/g).The absorption process could be well described by Freundlich equation and pseudo-second-order kinetic equation,and chemical adsorption played a role in the adsorption process.Furthermore,in the two-component continuous adsorption experiment,PE exhibited much faster penetration rate,with a long breakthrough interval and a high separation factor(3.93),indicating that HCCM could separate AP and PE effectively.After recycled for 5 times,HCCM still retained similar adsorption capacity,indicating good recyclability.