超声波辅助磷酸铝镁有序介孔材料低热固相合成及其形貌自组装

Morphology Self-assembly of Ordered Mesoporous MgAlPO Synthesized by Ultrasound-assisted Solid State Chemical Reaction at Low Temperature

在超声波的辅助下,以十六烷基三甲基溴化铵为模板,通过六水氯化铝、十二水磷酸氢二钠与六水氯化镁的低热固相反应合成了磷酸铝镁(MgAlPO)有序介孔材料,对材料进行了性能表征,探讨了磷酸铝镁介孔材料的自组装机理.结果表明,镁以同晶取代的方式进入磷酸铝骨架,并形成有序的介孔材料;有序介孔孔道呈平行四边形排列,其微观形貌为球形,球体曲面由不同粒径的纳米粒子自组装而成,其BET比表面积为502.7m2/g,孔容为0.3378cm3/g,孔半径分布中心为1.21nm.

With the ultrasonic-assisted approach, ordered mesoporous magnesium aluminophosphate （MgAlPO） crystalline powder was prepared by a solid-state reaction of maganesium chloride hexahydrate （MgCl2-6H2O）, aluminium chloride hexahydrate （AlCl3.6H2O） and disodium hydrogen phosphate dodehydrate （Na2HPO4.12H2O） with cetyltrimethylammonium bromide as a template. Its properties were characterized by SEM, XRD, HRTEM, N2-physisorption at 77 K, FT-IR and EDS. The self-assembly mechanism of MgAlPO ordered mesoporous material was also investigated. The results show that magnesium was doped into the framework of aluminophosphate by isomorphous substitution of metal magnesium and then the ordered mesoporous material MgAlPO formed. The mesoporous channels in the material were arrayed by paralleogram. Its morphology was spherical from the self-assembly of nanoparticles with various sizes. Meanwhile, the specific surface area of 502.7 m^2/g, pore radius size distribution centre of 1.21 nm and pore volume of 0.3378 cm^3/g in the obtained material were measured.