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在锐钛矿相TiO2纳米晶基础上,通过溶胶-凝胶法,以聚甲基丙烯酸甲酯(PMMA)微球为模板合成了三维(3D)多孔SiO2-TiO2异质结复合材料,采用XRD、ESEM等技术对产物进行表征,并研究了其光催化特性.结果表明:复合SiO2提高了纳米锐钛矿相TiO2的亲水性,经550℃热处理后的TiO2仍具有以锐钛矿相为主的相组成;在光催化降解甲基橙实验过程中,经去模板后形成的三维多孔SiO2-TiO2异质结复合材料表现出较纯锐钛型TiO2更为优异的光催化活性,其降解速率较TiO2提高了3倍,较SiO2提高了30倍,这主要与复合SiO2后其锐钛矿相结晶度提高和三维多孔结构具有更大的比表面积等因素有关.
Based on anatase TiO2 nanocrystals, three-dimensional (3D) porous SiO2-TiO2 heterojunction composites were synthesized by sol-gel method using polymethylmethacrylate (PMMA) microspheres as template. , ESEM and other techniques to characterize the product and study its photocatalytic properties.The results show that the composite SiO2 increases the hydrophilicity of nano-anatase phase TiO2, the TiO2 after heat treatment at 550 ℃ still has the characteristics of anatase phase In the photocatalytic degradation of methyl orange, three-dimensional porous SiO2-TiO2 heterostructure composite formed after de-templateing showed more excellent photocatalytic activity than pure anatase TiO2, and its degradation Compared with TiO2, the rate of silica particles increased by 3 times, which is 30 times higher than that of SiO2, which is mainly related to the increase of crystallinity of anatase phase and the larger specific surface area of three-dimensional porous structure.