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采用溶胶-凝胶法制备了锌掺杂钛酸锶粉体(Zn-SrTiO_3),通过X射线衍射(XRD)、扫面电子显微镜(SEM)和激光粒度仪对样品进行表征和分析,以亚甲基蓝(MB)作为目标降解物,考察了不同掺杂浓度样品对MB的光催化降解效果。结果表明,钛酸锶经锌掺杂后仍然保持了钙钛矿结构,Zn~(2+)进入晶格对Sr~(2+)进行了替位掺杂,晶格常数变小;样品形貌为有序多孔疏松结构,粒度分布均匀,热处理温度升高,样品发生热团聚;锌掺杂明显提高了SrTiO_3粉体的光催化活性,当掺杂量n(Zn)∶n(Ti)=0.015、热处理温度900℃时,Zn-SrTiO_3样品的光催化活性最高,其一级表观速率常数较相同条件下纯SrTiO_3提高了约3.6倍,样品光催化性能稳定。
Zinc-doped strontium titanate (Zn-SrTiO_3) powders were prepared by sol-gel method. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and laser particle size analyzer. (MB) as the target degradation products, the effect of different doping concentration on MB photocatalytic degradation was investigated. The results show that the strontium titanate still retains the perovskite structure after doping with Zn, and the substitution of Sr2 + into the lattice of Zn2 + The ordered porous structure showed uniform particle size distribution and heat treatment temperature. The sample was thermally agglomerated. The doping of Zn (superscript 3+) significantly increased the photocatalytic activity of SrTiO 3 powder. 0.015 and the heat treatment temperature is 900 ℃, the photocatalytic activity of Zn-SrTiO 3 sample is the highest, the first order apparent rate constant is about 3.6 times higher than pure SrTiO 3 under the same condition, and the photocatalytic activity of the sample is stable.