以Bi（NO3）3、NH4VO3为原料,NaOH为pH调节剂,采用微波水热法在180℃制备了BiVO4微球,分析了不同煅烧温度对晶型、形貌的影响,并进一步探讨了BiVO4晶型与其光催化性能的关系。采用XRD、SEM和UV-Vis吸收光谱对产品进行了分析表征,并以光催化降解亚甲基蓝为模型反应研究BiVO4的光催化性能。结果表明所制备的BiVO4微球是四方相结构,球的直径在1～3μm之间,将其在500℃煅烧后发生晶型转变,600℃煅烧可得到纯单斜相BiVO4微球,且具有良好的可见光催化活性。而且,不同晶型的BiVO4影响亚甲基蓝的降解效果。
Bismuth vanadate（BiVO4） microspheres were prepared with Bi（NO3）3 and NH4VO3 as starting materials and with NaOH to adjust pH through the microwave hydrothermal method at 180℃.The effect of different calcination temperatures on the crystalline phase and morphology was investigated,and the relationship between crystalline phase of BiVO4 and its photocatalytic performance was further studied.The as-prepared BiVO4 samples were characterized by XRD,SEM and UV-Vis.The photocatalytic activity of the BiVO4 microspheres was determined by degradation of methylene blue molecules under visible light irradiation.The results indicated that the crystalline phase of as-prepared BiVO4 microspheres was tetragonal phase,and the diameter of microspheres was 1-3μm.It is found that the phase transition had undergone after being calcined at 500℃,and monoclinic scheelite BiVO4 microspheres obtained by being calcined at 600℃ had the excellent visible-light photocatalysis.Besides,BiVO4 with different crystalline forms can affect the degradation of methylene blue molecules.
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