球磨法制备钒酸铋及性能研究

球磨法制备钒酸铋及性能研究【摘要】采用球磨法，以 Bi(NO3)3·5H2O 和 NH4VO3为原料，通过控制不同的反应时间、pH 值、球磨机转速和球数，制备不同形貌和结构的 BiVO4。采用 X 射线衍射（XRD）、扫描电子显微镜（SEM）进行了结构表征，通过模型化合物亚甲基蓝的降解脱色实验研究了其光催化活性，考察了亚甲基蓝初始浓度、PH、球磨时间等因素对降解率的影响。结果表明，在可见光照射下，四方与单斜（单斜为主相）混合晶相钒酸铋的光催化活性比纯单斜晶相或纯四方晶相的催化活性更高。在室温条件下，通过控制一定的条件，可直接制备出结晶较好的 BiVO4类细胞体球形颗粒和类梭形体颗粒。球磨的时间和 pH 对钒酸铋的形貌的形成有很重要的作用。钒酸铋作为光催化材料可以很好的降解有机污染物，在环境水污染治理中有良好的应用前景该方法具有合成温度低，能耗少，工艺简单，环境友好等优点。【关键词】钒酸铋 球磨法 晶相 形貌Study on Preparation and properties of bismuth vanadate by ball milling 【Abstract】 BiVO4 with different morphology and structure was prepared by ball milling with Bi(NO3)3 5H2O and NH4VO3 as raw materials and by controlling different reaction time, pH value, ball milling speed and ball number. The structure was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The photocatalytic activity of the model compound methylene blue was studied by decolorization experiments. The effects of initial concentration of methylene blue, PH and milling time on the degradation rate were investigated. The results show that under visible light irradiation, the photocatalytic activity of bismuth vanadate in the mixed crystal phase of tetragonal and monoclinic (monoclinic as the main phase) is higher than that in the pure monoclinic or tetragonal phase. At room temperature, by controlling certain conditions, spherical and spindle-like particles of BiVO4 cells with good crystallinity can be prepared directly. The milling time and pH value...