摘要：在不同温度下, 以氢氧化钠作为沉淀剂, 采用共沉淀法合成纯的以及不同浓度钇掺杂亚稳相γ-Bi₂O₃。X射线衍射结构表征显示, 温度越高, 制备纯相γ-Bi₂O₃反应时间越短, 而钇引入并未改变样品的晶体结构。扫描电子显微镜对样品进行微观形貌表征, 发现所有颗粒样品呈现四面体形状, 且钇掺杂增加颗粒聚集度。随着掺杂浓度增加, 附着在四面体表面上的小颗粒尺寸逐渐增大。紫外可见漫反射光谱分析表明, 钇掺杂引起禁带宽度变窄。选择罗丹明B为典型污染物以及γ-Bi₂-xYxO₃为催化剂, 光催化降解性能随掺杂而提高。

关键词：γ-Bi₂O₃；Y 掺杂；光催化降解

Abstract：Precipitation method was used to synthesize pure phaseγ-Bi₂O₃ and different concentration yttrium doping samples with NaOH as precipitant at different temperatures. X-ray diffraction characterization of the samples shows that the required reaction time shortened along with temperature increase and crystal structure of all samples are unchanged by introducing yttrium into lattice. The microstructure of the sample is characterized by scanning electron microscopy. It is found that all samples exhibite tetrahedral particles and yttrium doping increases particle aggregation degree. The sizes of small particles attached to tetrahedral surface become larger gradually with increment of doping concentration. Ultraviolet visible diffuse reflectance spectroscopy analysis indicates the forbidden band width narrowed due to yttrium doping. Selecting Rhodamine B as model pollutant and γ-Bi₂-xYxO₃ as photocatalyst, the degradation performance is enhanced with doping.

Keywords：γ-Bi₂O₃；Y doping；photocatalytic degradation