Abstract Using lutetium oxide, nitric acid, ammonium vanadate and citric acid as main materials, LuVO4 was prepared by a facile sol-gel method. The gel of LuVO4 was kept at 100 °C for 24 h to get the xerogel. Then, the xerogel was, respectively, calcined in muffle furnace at 500 °C, 600 °C, 700 °C and 800 °C to make single phase nanoparticulate LuVO4. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared (FT-IR) spectroscopy and diffuse reflectance spectroscopy (DRS). The results showed that the pure LuVO4 can be obtained through calcination at 700–800 °C. LuVO4 had an average particle size of 100 nm and the band gap was 2.25 eV. The photocatalytic activities of LuVO4 were investigated by methylene blue which was used as simulated sewage. Under visible light, LuVO4 showed good photocatalytic degradation activity for degradation of methylene blue. This indicated that LuVO4 has broad practical application prospects in the field of photocatalytic degradation of organic pollutants.

中文翻译：

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溶胶-凝胶法制备纳米LuVO4的表征和光催化活性

摘要 以氧化镥、硝酸、钒酸铵和柠檬酸为主要原料，采用简便的溶胶-凝胶法制备了LuVO4。LuVO4 的凝胶在 100°C 下保持 24 小时以获得干凝胶。然后，将干凝胶分别在马弗炉中在 500°C、600°C、700°C 和 800°C 下煅烧以制备单相纳米颗粒 LuVO4。制备的样品通过X射线衍射（XRD）、扫描电子显微镜（SEM）、傅里叶变换红外（FT-IR）光谱和漫反射光谱（DRS）进行表征。结果表明，通过在 700-800 ℃下煅烧可以得到纯的 LuVO4。LuVO4 的平均粒径为 100 nm，带隙为 2.25 eV。以亚甲基蓝为模拟污水,研究了LuVO4的光催化活性。在可见光下，LuVO4对亚甲基蓝的降解表现出良好的光催化降解活性。这表明LuVO4在光催化降解有机污染物领域具有广阔的实际应用前景。