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以正硅酸乙酯(TEOS)为前驱体,以氨水为催化剂,制得含有SiO_2粒子的碱催化SiO_2溶胶;向碱催化SiO_2溶胶中加入前驱体钛酸丁酯(TBOT)和酸催化剂盐酸,得到以SiO_2粒子为核和以TiO_2为壳的“核—壳”SiO_2-TiO_2纳米材料.结果表明:SiO_2核的粒径约为13.5 nm;随着钛酸丁酯添加量的增加,SiO_2核表面不断有TiO_2壳形成,其粒径从13.5 nm增大至24.4 nm.XRD测定结果表明煅烧温度为500℃时,锐钛矿TiO_2的特征衍射峰明显增强.该温度下“核—壳”SiO_2-TiO_2复合粉末对罗丹明B的降解率从21.99%提高到94.86%.
The basic catalyzed SiO_2 sol containing SiO_2 particles was obtained by using TEOS as precursor and ammonia as catalyst. TBOT and HCl were added to the base-catalyzed SiO_2 sol, The “core-shell” SiO 2 -TiO 2 nano-materials with SiO 2 as core and TiO 2 as shell were obtained.The results showed that the particle size of SiO 2 core was about 13.5 nm. With the increase of the amount of Ti The surface of the core was continuously formed with TiO 2 shell and its particle size increased from 13.5 nm to 24.4 nm.The results of XRD showed that the characteristic diffraction peak of anatase TiO 2 was obviously enhanced at the calcination temperature of 500 ° C. The core- "The degradation rate of rhodamine B by SiO 2 -TiO 2 composite powder increased from 21.99% to 94.86%.