Cu掺杂BiVO4光催化剂的水热合成及其光催化性能研究

以硝酸铋、偏钒酸铵、硝酸铜、氢氧化钠、硝酸等为主要原料,采用水热法合成Cu掺杂BiVO₄光催化剂。主要研究了Cu的掺杂量对合成BiVO₄光催化剂性能的影响。采用XRD、SEM、BET、紫外-可见分光光度计等检测仪器对合成试样的物相组成、微观形貌、比表面积及光催化性能进行了表征。结果表明:Cu掺杂改变了合成产物的物相组成,产物中出现Bi₂O₃、V₂O₅等杂质,并且产物的形貌发生了较大变化。光催化降解亚甲蓝结果表明,随着Cu掺杂量的增加,合成光催化剂的光催化性能呈现先增加后减小趋势,当Cu掺杂量为5 wt%时,合成产物的光催化性能达到最佳,在高压汞灯照射240 min时,对亚甲蓝(10 mg/L)的降解率达87.8%,比同条件下纯BiVO4的光催化效率提高16.4%。

Research on Preparation of and Photocatalytic Properties Cu-Doped BiVO4 by Hydrothermal Synthesis

Cu-doped BiVO4 photocatalyst was synthesized by hydrothermal method with bismuth nitrate, ammonium metavanadate, copper nitrate, sodium hydroxide and nitric acid as main raw materials. The effect of Cu doping amount on the performances of BiVO4 photocatalyst was studied. Phase composition, micro-morphology, specific surface area and photocatalytic activity of the synthesized samples were characterized by XRD, SEM, BET and UV-Vis spectrophotometer. The results show that phase composition of the synthesized product is changed by the doping of Cu, and Bi2O3, V2O5 appear in the product, and morphology of the product is also changed considerably. The photocatalytic degradation of methylene blue shows that photocatalytic activity of the synthesized photocatalyst increases first and then decreases with the increase of Cu doping. Photocatalytic activity of the synthesized product was the best when the Cu doping is 5 wt%. The degradation rate of methylene blue(10 mg/L) was 87.8% under the mercury lamp irradiation for 240 minutes and 16.4% higher than that of pure BiVO4 under the same conditions.