采用水热法合成了纯单斜晶系的可见光催化剂BiVO4,考察了水热温度、水热时间和体系的pH值对BiVO4结构和光催化性能的影响。利用XRD、SEM、BET和UV-VIS对样品进行了表征,结果表明：获得的BiVO4具有中空棒状结构,升高水热温度、提高反应溶液的pH值、延长水热时间有利于单斜晶系BiVO4的生成。确定了BiVO4的最优合成条件为：水热温度140℃,水热时间6h,反应体系pH=9。选择亚甲基蓝溶液作为光催化降解物质,研究BiVO4的可见光催化性能和催化机理。结果表明,最优条件下制备的BiVO4具有较好的可见光催化性能;同时,增加降解体系的pH值提高了催化剂对亚甲基蓝的吸附能力和活化电子的利用效率,有利于提高BiVO4的光催化性能。
Visible light photocatalyst BiVO4 with a monoclinic microstructure was synthesized by hydrothermal method at 140℃. Effects of hydrothermal temperature, hydrothermal time and pH value of synthetic solution on the microstructure and photocatalytic property of BiVO4 were studied. The products were characterized by X-ray diffractometry （XRD）, scanning electron microscopy （SEM）, BET specific surface area and ultraviolet-visible （UV-Vis） absorption measurements. Results show that the obtained BiVO~ presents hollow-microtube framework. It was favourable to form monoclinic BiVO4 by increasing the hydrothermal temperature, raising the pH value of the solution and prolonging the reaction time. So the optimum reaction conditions for fabricating monoclinic BiVO4 was determined as following： adjusting the pH value of synthetic solution to 9, controlling hydrothermal temperature at 140~C and fixing the hydrothermal time to 6 h. The photocatalytic activity and reaction mechanism of BiVO4 was tested by photodecompostion of methylene blue under visible light illumination. Results indicate that the BiVO4 synthesized under the optimal conditions possesses quite good visible light photocatalytic activity. Meanwhile, increasing the pH value of the degradation systems is beneficial to improve photocatalytic capability of BiVO4 because of its enhancing absorption capacity and using efficiency of activated electron.
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