溶胶-凝胶法制备Bi2MoO6纳米光催化剂的结构、形貌和光磁特性

摘要

Bismuth molybdate (Bi2MoO6) nano-particles (NPs) were synthesized using bismuth nitrate, ammonium molybdate, citric acid and ethyl cellulose by a simple sol−gel method. The structure, morphology, opto-magnetic and photocatalytic properties of the obtained powder were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectra, high resolution scanning electron microscopy (HRSEM), energy dispersive X-ray (EDX), ultraviolet−visible diffuse reflectance spectra (DRS), photoluminescence (PL) spectra and vibrating sample magnetometer (VSM) techniques. The XRD, FT-IR and EDX results indicate that the resultant powder is pure and single phase crystalline Bi2MoO6 with orthorhombic structure. The HRSEM image shows that the morphology of obtained powder consists with well defined nano-particles structure. The VSM results show superparamagnetic behavior of the obtained nano-particles. The photocatalytic activity of Bi2MoO6 nano-particles was performed. The addition of TiO2 catalyst enhances the photocatalytic activity of Bi2MoO6 nano-particles. The catalysts Bi2MoO6, TiO2 and mixed oxide catalyst Bi2MoO6−TiO2 nano-composites (NCs) were tested for the photocatalytic degradation (PCD) of 4-chlorophenol (4-CP). It is found that the PCD efficiency of Bi2MoO6−TiO2 NCs is higher than that of pure Bi2MoO6 and TiO2 catalysts.%采用硝酸铋、钼酸铵、柠檬酸和乙基纤维素为原料，通过溶胶−凝胶法制备钼酸铋(Bi2MoO6)纳米颗粒。通过 X 射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、高分辨扫描电镜(HRSEM)、能谱分析(EDX)、紫外−可见漫散射光谱(DRS)、光致发光光谱(PL)和振动样品磁强计(VSM)等手段对制备的粉末结构、形貌、光磁性和光催化性能进行表征。XRD、 FT-IR和EDX结果表明，制备的粉末是具有斜方晶结构的纯单相晶体Bi2MoO6。HRSEM图像显示，制备的粉末具有很好的纳米颗粒结构。VSM结果显示制备的纳米颗粒具有超顺磁性。Bi2MoO6纳米颗粒的光催化活性实验发现 TiO2催化剂的添加提高 Bi2MoO6纳米颗粒的光催化活性。催化剂 Bi2MoO6、TiO2和混合氧化物催化剂Bi2MoO6−TiO2纳米复合材料对4-氯酚的光催化降解(PCD)，发现Bi2MoO6−TiO2纳米复合材料的PCD效率比纯Bi2MoO6和TiO2催化剂的PCD效率高。