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以NH4VO3和Bi(NO3)3 5H2O为起始原料,在无模板剂的条件下,采用微波水热法可控制备BiVO4微晶。利用X射线衍射仪、扫描电子显微镜和紫外–可见吸收光谱研究了合成溶液的pH值对微波水热合成BiVO4微晶的物相、形貌和光学性能的影响。结果表明:在微波水热条件下,pH值为0.1～10.0,温度为160℃时反应1h,均可制备出单斜相BiVO4微晶,并且随着pH值的增加,产物形貌由片状向棒状转变。pH值越接近中性,(040)晶面衍射峰强度越强,吸收边界越向低波长范围偏移,禁带宽度随之增大。
Using NH4VO3 and Bi (NO3) 3 5H2O as raw materials, the prepared BiVO4 crystallites can be controlled by microwave hydrothermal method without template agent. The effects of pH value of synthetic solution on the phase, morphology and optical properties of BiVO4 microcrystals were investigated by X-ray diffraction, scanning electron microscopy and UV-Vis absorption spectroscopy. The results show that the monoclinic BiVO4 crystallites can be prepared under the conditions of microwave hydrothermal treatment at pH value of 0.1-10.0 and reaction temperature of 160 ℃ for 1 h, and with the increase of pH value, the product morphology is flaky Change to stick. The closer the pH value is to the neutrality, the stronger the diffraction peak intensity of the (040) crystal plane is, the more the absorption boundary shifts to the lower wavelength range, and the forbidden band width increases accordingly.