摘要：以KOH、Nb₂O₅和Sm(NO₃)_3为原料,采用水热合成法制备掺杂不同物质的量的Sm的片层状K₄Nb₆O₁₇光催化剂;采用X射线衍射、扫描电子显微镜、能量色散X射线光谱,高分辨率透射电子显微镜和X射线光电子能谱等测试技术对其结构和形貌进行表征,考察Sm掺杂K₄Nb₆O₁₇复合材料对有机染料罗丹明的降解性能。结果表明,Sm的掺杂提高了K₄Nb₆O₁₇的结晶度,Sm以Sm₂O₃的形式高度分散在K₄Nb₆O₁₇中;当Sm与Nb的物质的量比为0.01时,K₄Nb₆O₁₇具有最佳的光催化活性,在80 min内能使质量浓度为20 mg/L的罗丹明染料溶液100 mL完全脱色。

关键词：铌酸盐；水热合成；光催化

Abstract：Sm doped K₄Nb₆O₁₇ photocatalysts were prepared by using KOH, Nb₂O₅ and Sm(NO₃)_3as starting materials through hydrothermal route. The crystalline and micro-structure of the prepared nanoparticles were characterized by X-ray powder diffraction(XRD), scanning electron Microscopy combined with Energy Dispersive X-ray analysis(SEM-EDX), high resolution transmission electron microscope(HRTEM) and X-ray photoelectron spectroscopy(XPS) techniques. The results show that the crystallinity of K₄Nb₆O₁₇ increases with the introduction of Sm content. The Sm presents in the K₄Nb₆O₁₇ crystalline in the form of Sm₂O₃. The catalyst with a Sm/Nb molar ratio of 1% has the best performance for rhodamine degradation. The organic dye rhodamine(100 mL) with a concentration of 20 mg/L can be effectively degraded by 30 mg of catalyst in 80 min.

Keywords: potassium niobate；hydrothermal synthesis；photocatalytic activity