壳聚糖/埃洛石纳米管复合多孔颗粒制备

Preparation of Chitosan/Halloysite Nanotube Hybrid Porous Beads

以天然材料埃洛石纳米管(HNTs)和壳聚糖(CTS)为原料,戊二醛为交联剂,吐温-80为乳化剂,采用反相交联法和冷冻干燥技术成功制备了CTS/HNT复合多孔颗粒.利用扫描电子显微镜(SEM)对复合颗粒的形貌和结构进行了表征,结果表明CTS/HNT复合颗粒是由大量HNTs和CTS搭接而形成的多孔结构.进一步研究了CTS/HNT复合颗粒对甲基橙(MO)的吸附性能,考察了pH值、MO初始浓度和反应时间对吸附过程的影响,复合多孔颗粒在吸附过程中表现出很好的稳定性,较高的吸附容量,而且循环再生性能良好,重复使用十次后对MO的去除率仍能保持在88%以上.

Natural resources of halloysite nanotubes and chitosan were used to prepare CTS/HNT hybrid porous beads with reversed-phase cross-linking and freeze drying technique, using glutaradehyde as a cross-linker and Tween-80 as the emulsifier. The hybrid beads were characterized by scanning electron microscope （SEM）. The SEM image shows that hybrid bead is a porous structure comprised of chitosan and accumulated halloysite nanotubes. The CTS/HNT porous beads were used as adsorbent to remove anionic dye of methyl or- ange （MO） from aqueous solution. The effect of pH, MO initial concentration and contact time were investigated. The adsorbent exhibited good stability, relatively high adsorption capacity and could maintain high remov- al efficiency of above 88% after 10 times of cyclic utilization.