制备方法对纳米TiO_2介孔柱撑蒙脱石结构和性能的影响

The effect of the preparation method on the structure and property of nano TiO_2-pillared montmorillonite

分别通过离子交换方法和离子交换-水热法制备纳米TiO2介孔柱撑蒙脱石,利用XRD、DSC-TG、N2吸附-脱附等方法对材料进行结构特征与性能的表征。实验结果表明,传统的离子交换方法可使制备的钛柱撑蒙脱石比表面积、孔体积增大;离子交换-水热法可使TiO2介孔柱撑蒙脱石中锐钛矿晶型更好,晶粒变大,柱撑蒙脱石结构更稳定,而且水热的温度越高,所需反应时间越短,锐钛矿的晶型更好,发育更完善。

Two different means were employed to prepare nanoparticle TiC）z-pillared montrnorillonite. One was the conventional ion exchange method and the other was post hydrothermal treatment after ion-exchange. The calcined clay was characterized by different physieochemical techniques such as XRD, DSC-TG and nitrogen adsorption-desorption. The results demonstrate that the conventional ion-exchange method causes the titania pillared montmorillonite clay to have relatively large surface area and pore volume. The post hydrothermal treatment method gives rise to better crystallographic form, bigger crystallite and more stable pillared montmorillonite clay. Higher temperature results in shorter reaction time and better crystallographic form of anatase.