The bismuth vanadium oxide photocatalysts with different phases and morphologies were facilely synthesized by the alkali-treatment synthesis method. BiVO₄ polyhedrons as the raw materials were firstly prepared by a facile hydrothermal method. With the change of the concentrations of NaOH, the surfaces of the raw BiVO₄ polyhedrons became rough and then other phases appeared, such as Bi₂O₃ regular tetrahedrons, Bi₇VO₁₃ sheets and rods, and Bi₂₅VO₄₀ triangle-blocks and cuboids. When the concentration of NaOH was 0.1 M, the obtained samples were the composites of the polyhedral BiVO₄ and regular tetrahedral Bi₂O₃, which exhibited the best photocatalytic activity in the degradation of several organic pollutants. From the exploration of the degradation mechanism, it showed that the transfer rate of photogenerated electron–hole pairs on the composites of BiVO₄ and Bi₂O₃ was promoted. The h⁺, •OH and O₂•- played key effect in the degradation process. Furthermore, the bismuth vanadium oxide photocatalysts also showed antibacterial activities towards E. coli.

采用碱处理法合成了具有不同相和形貌的铋钒氧化物光催化剂。首先以简便的水热法制备了以BiVO ₄为原料的多面体。随着NaOH浓度的变化，原始BiVO ₄多面体的表面变得粗糙，然后出现其他相，如Bi ₂ O ₃正四面体，Bi ₇ VO ₁₃片和棒，Bi ₂₅ VO ₄₀三角形块和长方体。当NaOH的浓度为0.1 M时，所得样品为多面体BiVO ₄与规则四面体Bi的复合物。₂ O ₃，在降解几种有机污染物中表现出最好的光催化活性。从降解机理的探索中可以看出，BiVO ₄和Bi ₂ O ₃复合材料上光生电子-空穴对的转移速率得到了提高。h ⁺，•OH和O ₂ •-在降解过程中起关键作用。此外，铋钒氧化物光催化剂也显示出对大肠杆菌的抗菌活性。