Abstract

Using Pr(NO₃)₃·6H₂O, NH₄VO₃ and C₆H₈O₇·H₂O as main raw materials, PrVO₄ was successfully prepared by sol-gel method. The structure and morphology of samples were characterized by thermogravimetry and differential scanning calorimetry (TG-DSC), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and UV-visible diffuse reflectance spectroscopy (DRS). The effects of different synthesis temperature and light time on the photocatalytic activity of PrVO₄ samples were investigated using methyl orange solution as simulated sewage. The results show that PrVO₄ of pure tetragonal zircon structure can be prepared at calcination temperature of 600 °C ∼900 °C. PrVO₄ particles were relatively uniform with average grain size of 1 ∼ 3 μm. The photocatalytic activity of sample prepared at 800 °C was the best. After UV irradiation for 150 min, the degradation rate of 10 mg/L methyl orange is nearly 100% in presence of PrVO₄ sample prepared at 800 °C. The PrVO₄ showed excellent photocatalytic activity for degradation of methyl orange.

摘要

以Pr(NO ₃ ) ₃ ·6H ₂ O、NH ₄ VO ₃和C ₆ H ₈ O ₇ ·H ₂ O为主要原料，采用溶胶-凝胶法成功制备了PrVO ₄。通过热重和差示扫描量热法(TG-DSC)、粉末X射线衍射(XRD)、扫描电子显微镜(SEM)、傅里叶变换红外光谱(FT-IR)和紫外-可见漫射光谱对样品的结构和形貌进行表征。反射光谱 (DRS)。不同合成温度和光照时间对PrVO ₄光催化活性的影响使用甲基橙溶液作为模拟污水对样品进行研究。结果表明，在600℃～900℃的煅烧温度下可以制备纯四方锆石结构的PrVO ₄。PrVO ₄颗粒相对均匀，平均粒径为1 ∼ 3 μm。800℃制备的样品光催化活性最好。UV照射150分钟后，在800°C制备的PrVO ₄样品存在下，10 mg/L甲基橙的降解率接近100% 。PrVO ₄对甲基橙的降解表现出优异的光催化活性。