关键词: 整体型;大孔SiO2;Silicalite-1纳米颗粒;多级孔;苯酚吸附

Abstract: The monolithic macroporous SiO2 with three-dimensional (3D) interconnected channel structure constructed by SiO2 nano-film was prepared by pillared monolithic macroporous polymer as template.Then, the various regular shaped monolithic Silicalite-1 @ SiO2 was prepared under hydrothermal condition by immersing the macroporous SiO 2 in the Silicalite-1 precursor solution.All materials were characterized by SEM, XRD, MIP (mercury intrusion porosimetry) and BET.The results show that the macropore size of Silicalite-1@SiO2 is 0.5-1 μm, and the Silicalite-1 nanoparticles with a diameter between 100 and 200 nm are in situ grown on the wall of the macroporous SiO 2 .Silicalite-1 nanoparticles are combined with the wall of macroporous SiO 2 through chemical bonds.Silicalite-1@SiO2 shows highest crystallinity when the hydrothermal crystallization time is 10 h and the Silicalite-1@SiO2 sample maintains the structure stability of macroporous SiO 2.Compared with monolithic macroporous SiO2 , the specific surface area (352 m2 /g) and micropore volume (0.088 cm3 /g) of Silicalite-1@SiO2 are significantly increased.Meanwhile, Silicalite-1@SiO2 exhibits excellent phenol adsorption property .

Key words: monolithic;macroporous SiO2;Silicalite-1 nanoparticle;hierarchical porous;phenol adsorption