介孔氧化硅交联壳聚糖复合材料的制备及其对重金属吸附性能研究

发布时间：2018-05-07 06:43

  本文选题：介孔氧化硅 + 硅烷化　； 参考：《化学研究与应用》2016年10期

【摘要】：利用γ-氨基丙基-三乙氧基硅烷偶联剂与活化的介孔氧化硅表面的羟基反应制备硅烷化介孔氧化硅,然后以乙二醛为活化剂与壳聚糖反应,制备一种新型的介孔氧化硅交联壳聚糖复合材料。采用小角度X射线衍射仪(SAXRD)、红外光谱(IR)、透射电子显微镜(TEM)和比表面测试仪(BET)等表征产物的结构、形貌和孔径分布等,并使用原子吸收分光光度计(AAS)评价该复合物对Pb~(2+)的吸附去除性能。研究结果表明:介孔氧化硅交联壳聚糖复合材料对Pb~(2+)的去除率比单一的介孔氧化硅或壳聚糖有明显的提高,它对Pb~(2+)的等温吸附线符合Langmuir模型,在温度25℃和p H=4.5时,它对Pb~(2+)的饱和吸附量为97.8 mg·g~(-1),高于纯壳聚糖的饱和吸附量(87.6 mg·g~(-1))。
[Abstract]:Silanized mesoporous silica was prepared by the reaction of 纬 -aminopropyl-triethoxy silane coupling agent with hydroxyl group on activated mesoporous silica surface, and then reacted with chitosan with Glyoxal as activator. A novel mesoporous silica crosslinked chitosan composite was prepared. The structure, morphology and pore size distribution of the products were characterized by small angle X-ray diffractometer (SAXR), infrared spectroscopy (IR), transmission electron microscope (TEM) and specific surface tester (BET). The adsorption and removal properties of Pb~(2 were evaluated by atomic absorption spectrophotometer (AAS). The results show that the removal rate of Pb~(2 by mesoporous silica cross-linked chitosan composite is significantly higher than that of single mesoporous silica or chitosan. The isothermal adsorption line of Pb~(2 is in accordance with the Langmuir model. At 25 鈩，

本文编号：1855819