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以硫酸氧钛为钛源、水和乙二醇为溶剂、甲酰胺(FA)为凝胶促进剂、聚乙烯吡咯烷酮(PVP)为相分离诱导剂,通过溶胶-凝胶伴随相分离法结合后续热处理得到具有共连续多孔结构的锐钛矿相TiO_2块体材料。采用扫描电子显微镜(SEM)、压汞测试、热重-差热分析法(TG-DTA)、X射线衍射(XRD)仪和透射电子显微镜(TEM)等测试技术研究了PVP添加量与材料孔结构的之间的关系。结果表明,当PVP添加量为1.76g时,产物具有三维共连续的多级孔结构,其孔隙率为60%,大孔孔径分布在1~3μm;骨架由尺寸分布在20~40nm的纳米晶组成。经过600℃热处理后,块体物相为锐钛矿。
Using titanium oxysulfate as titanium source, water and ethylene glycol as solvent, formamide (FA) as the gel accelerator and polyvinylpyrrolidone (PVP) as the phase separation inducer, the sol- The anatase phase TiO 2 bulk material with co-continuous porous structure was obtained by heat treatment. The effects of the amount of PVP added and the pore size of material hole were investigated by SEM, Hg, TG-DTA, XRD and TEM. The relationship between structure. The results show that the product has a three-dimensional co-continuous multi-stage pore structure with a porosity of 60% and a large pore size distribution of 1 ~ 3 μm when the amount of PVP is 1.76 g. The framework is composed of nano-crystals with a size distribution of 20-40 nm composition. After 600 ℃ heat treatment, the bulk phase is anatase.