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采用溶胶-凝胶法合成钼酸镍(NiMoO_4)纳米颗粒。以水作为溶剂使所得产品具有纳米晶结构。使用X射线衍射、能量分散X射线分析(EDX)和傅里叶转换红外光谱等手段对纳米晶进行结构表征。使用扫描电镜和透射电镜对纳米晶颗粒的尺寸大小和形貌进行观察。结果表明,所得纳米颗粒和纯度较高,为单相单斜结构。采用紫外-可见漫反射光谱(UV-Vis-DRS)和光致发光测量法研究室温下产品的光学性能。采用振动样品磁强计(VSM)研究样品的磁性能。结果显示,所得样品具有超顺磁行为。考察了NiMnO_4样品的光催化活性。结果显示,添加TiO_2能提高NiMnO_4的光催化活性。测定了催化剂NiMnO_4、TiO_2和NiMoO_4-TiO_2纳米颗粒对4-氯酚(4-CP)的光催化降解行为。光催化降解结果显示,NiMoO_4-TiO_2纳米颗粒的光催化降解效率高于NiMnO_4和TiO_2的。
Synthesis of Nickel Molybdate (NiMoO_4) Nanoparticles by Sol - Gel Method. The resulting product has a nanocrystalline structure using water as a solvent. Nanocrystals were characterized by X-ray diffraction, energy dispersive X-ray analysis (EDX) and Fourier transform infrared spectroscopy. The size and morphology of nanocrystalline particles were observed by scanning electron microscopy and transmission electron microscopy. The results show that the resulting nanoparticles with high purity, single-phase monoclinic structure. The optical properties of the products at room temperature were studied by UV-Vis-DRS and photoluminescence measurements. The magnetic properties of the samples were investigated using a vibrating sample magnetometer (VSM). The results show that the resulting sample has superparamagnetic behavior. The photocatalytic activity of NiMnO_4 samples was investigated. The results show that addition of TiO_2 can increase the photocatalytic activity of NiMnO_4. The photocatalytic degradation of 4-chlorophenol (4-CP) by NiMnO 4, TiO 2 and NiMoO 4 -TiO 2 nanoparticles was measured. The results of photocatalytic degradation showed that the photocatalytic degradation efficiency of NiMoO_4-TiO_2 nanoparticles was higher than that of NiMnO_4 and TiO_2.