囊泡状介孔二氧化硅的制备及吸附性能

Preparation and Adsorption Properties of Laccase of Vesicle like Mesoporous Silica

摘要:

分别采用磷酸（H3PO4）和硝酸（HNO3）为催化剂，以椰油基甘油酸钠（YCS）为模板，正硅酸乙酯（TEOS）为硅源，制备了三维六方相和囊泡相的介孔二氧化硅（SiO2）.并将样品分别在550℃、700℃和850℃下焙烧，利用X射线衍射（XRD）、高倍扫描电镜（HRSEM）、高倍透射电镜（HRTEM）、氮气吸附和微电泳法对所得样品进行表征，得出焙烧温度对样品的介孔孔径、比表面积的影响关系.还研究两种结构的介孔SiO2对漆酶的吸附等温线.讨论了介孔SiO2的等电点、表面积、孔体积等参数对漆酶在介孔SiO2表面的吸附等温线和吸附动力学的影响.

Abstract:

Three dimensional hexagonal mesoporous silica (YPS, P means H3PO4) and vesicle like mesoporous silica (YNS, N means HNO3) were synthesized by the sol gel method using H3PO4 or HNO3 as catalyst, sodium coco glycerol (YCS) as surfactant, tetraethyl orthosilicate (TEOS) as silicon source. The as prepared YPS and YNS samples were calcined at different temperatures including 550 ℃, 700 ℃ and 850℃. The prepared samples were characterized by X ray diffraction (XRD), high resolution scanning electron microscope (HRSEM), high power transmission electron microscopy (HRTEM), nitrogen adsorption and micro electrophoresis, the effects of the calcination temperature on pore size, surface area were discussed. Moreover, the influences of the adsorption isotherm and the kinetics model of laccase on YPS and YNS samples of the isoelectric point, surface area, pore volume and other parameters were also discussed.