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以Bi(NO3)3.5H2O和NH4VO3为原料,采用水热法制备了新型可见光BiVO4催化剂,并用X-射线衍射(XRD)、扫描电子显微镜(SEM)、红外光谱(IR)和紫外-可见光漫反射光谱(UV-vis DRS)对产品进行了结构表征,并将其应用于光催化降解中成药制药废水降解反应中,通过正交实验和单因素分析,考察了催化剂用量、空气流量、溶液pH值和助氧化剂H2O2对制药废水COD去除率、脱色率的影响。实验结果表明,水热产品属于单斜晶系BiVO4,其带隙能为2.41 eV,并具有良好的可见光催化活性。对于经10倍稀释的制药废水,BiVO4添加量为2 g/L,通氧量为120 L/h,助氧化剂H2O2添加量为1 mL,不改变废水pH值,在400 W金属卤化物灯离液面11 cm照射反应180 min的条件下,制药废水的COD去除率为94.3%,脱色率为95.6%,得到了较好的降解。
A new type of visible light BiVO4 catalyst was prepared by hydrothermal method using Bi (NO3) 3.5H2O and NH4VO3 as raw materials and characterized by XRD, SEM, IR and UV-Vis diffuse reflectance The structure of the product was characterized by UV-vis DRS and applied to the photocatalytic degradation of the Chinese traditional medicine pharmaceutical wastewater. Through orthogonal experiment and single factor analysis, the effects of catalyst dosage, air flow rate, solution pH value And auxiliary oxidant H2O2 on the COD removal efficiency and decolorization rate of pharmaceutical wastewater. The experimental results show that the hydrothermal product belongs to the monoclinic BiVO4 with a bandgap energy of 2.41 eV and good visible light catalytic activity. For 10-fold diluted pharmaceutical wastewater, BiVO4 was added at a rate of 2 g / L, oxygen flow rate was 120 L / h and oxidant H2O2 was added at 1 mL. The pH value of wastewater was not changed. Under the conditions of liquid 11 cm irradiation reaction for 180 min, the COD removal efficiency of the pharmaceutical wastewater was 94.3%, and the decolorization rate was 95.6%.