偏锡酸锌纳米微粒的水热法制备及其对甲基橙降解的光催化性能

摘要

Zinc stannate (ZnSnO3) nanoparticles were synthesized by hydrothermal method with zinc acetate and stannic chloride as the reactants and sodium polymethacrylate as the surfactant. The phase structure, surface composition and morphology of as-prepared ZnSnO3 nanoparticles were characterized by X-ray powder diffraction, Fourier transform infrared spec-trometry and scanning electron microscope. The catalytic performance of ZnSnO3 nanoparticles for photocatalytic degradation of methyl orange was evaluated. Results show that as-prepared ZnSnO3 nanoparticles have a size of about 20 nm and contain abundant carboxyl groups on surface. Besides, as-prepared ZnSnO3 nanoparticles have good catalytic perfortnace for the photocatalytic degradation of methyl orange solution with a pH of 2. Lowering initial concentration of the methyl orange solution corresponds to better degradation efficiency, and the degradation efficiency rises with increasing dosage of the catalyst. Moreover, recycling catalytic test results indicate that as-prepared ZnSnO3 nanoparticles as a catalyst for photocatalytic degradation of methyl orange is stable and can be well reused.%以醋酸锌和氯化锡为原料,以聚甲基丙烯酸钠(PMA)为表面活性剂,利用水热法合成了偏锡酸锌(ZnSnO3)纳米微粒；采用X射线衍射仪、傅立叶变换红外光谱仪、扫描电镜等分析了ZnSnO3纳米微粒的晶相、表面组成、形貌；并测定了ZnSnO3纳米微粒对甲基橙溶液的光催化降解性能.结果表明,所得ZnSnO3纳米微粒粒径约为20 nm,表面存在羧基；其对pH＝2的甲基橙溶液的光催化降解效果较好,甲基橙的初始浓度越低,降解效果越明显；随着催化剂用量的增加,降解效率逐渐增大.此外,循环催化试验结果表明ZnSnO3纳米微粒具有较好的催化稳定性.