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采用蒸发诱导自组装法合成了介孔TiO2,并将表面含有Si-OH基团的钨磷酸盐衍生物(Bu4N)3PW11O39-[O(SiOH)2](TBAPW11Si2)嫁接到乙醇回流脱模的介孔TiO2上,合成了TBAPW11Si2/TiO2介孔杂化材料.采用IR、XRD、N2吸附-脱附、TEM、ICP-AES对样品的结构和组成进行了表征.结果表明,TBAPW11Si2与TiO2之间的共价键联是通过表面Si-OH和Ti-OH间的缩合进行的;TiO2表面足够的Ti-OH基团和一定温度的焙烧是这一缩合的必要条件.与TiO2载体相比,嫁接了TBAPW11Si2的杂化样品,锐钛矿相的结晶度略有增加;但表面积、孔容和孔径均有所减小,且随TBAPW11Si2负载量的增加而降低.光催化降解甲基橙的结果显示,杂化样品表现出比载体TiO2高得多的催化活性,甚至与高结晶度的商品光催化剂P25相当,显示出多金属氧酸盐-TiO2协同作用的优越性.
The mesoporous TiO2 was synthesized by evaporation-induced self-assembly method and the tungstophosphate derivative (Bu4N) 3PW11O39- [O (SiOH) 2] (TBAPW11Si2) The structure and composition of the samples were characterized by IR, XRD, N2 adsorption-desorption, TEM and ICP-AES. The results show that TBAPW11Si2 / TiO2 mesoporous hybrid materials The covalent bonding is carried out through the condensation of Si-OH and Ti-OH on the surface. The Ti-OH group on the surface of TiO2 is calcined at a certain temperature and is the necessary condition for this condensation. Compared with TiO2, TBAPW11Si2 hybrid samples, the crystallinity of the anatase phase increased slightly, but the surface area, pore volume and pore size decreased and decreased with the increase of TBAPW11Si2 loading.The results of photocatalytic degradation of methyl orange showed that, The hybrid samples showed a much higher catalytic activity than the supported TiO2, even comparable to the high crystallinity commercial P25 catalyst, demonstrating the synergistic effect of the polyoxometalate-TiO2.