钒酸铋的制备及可见光降解罗丹明B的研究

以偏钒酸铵和碳酸铋为原料，用NaOH调节体系pH，水热法合成钒酸铋（BiVO₄）光催化剂。利用XRD和UV-Vis漫反射对样品的晶型结构和光吸收特性进行表征分析。以罗丹明B为目标降解物，卤素灯（λ＞400 nm）为光源，探讨水热温度、水热时间对合成BiVO₄催化剂的可见光催化活性影响。结果表明，在水热温度为200 ℃、水热时间为8 h的条件下合成的钒酸铋光解效率最高。实验还研究了罗丹明B水溶液pH、催化剂投加量对光催化罗丹明B降解率的影响。结果表明，在罗丹明B水溶液pH为3、初始质量浓度为10 mg/L、每60 mL溶液催化剂投加量为0.4 g时能达到较好的光催化效果，反应2 h后降解率可达97%。

Preparation of BiVO4 and photocatalytic degradation of RhB under visible light

BiVO₄ was synthesized via hydrothermal method，with Bi（NO₃）₃ and NH₄VO₃ as raw materials and with NaOH to adjust pH of the system.Crystal structure and optical absorption properties of the as-prepared material were characterized by XRD and UV-Vis.Taking rhodamine B as degradation objective，halogen lamp（λ＞400 nm）as light source，the influences of hydrothermal temperature and time on the visible photocatalytic activity of BiVO₄ were investigated.Results showed that the best preparation conditions were 200 ℃ and 8 h.Influences of pH of rhodamine B solution and dosage of catalyst on degradation rate of rhodamine B were also investigated，and results showed that when pH was 3 and catalyst′s dosage was 0.4 g（per 60 mL solution），the photocatalytic effect was the best， and the photocatalytic degradation rate could reach 97% after reaction for 2 h.