中文摘要：

以乙二醇为溶剂,通过加热回流法合成了高分散性的磷酸铋光催化剂,揭示了回流温度、回流时间对形貌结构与光催化性能的影响规律。研究表明六方相磷酸铋可以通过溶剂回流过程,实现从六方相到单斜相的可控相变。该高分散磷酸铋光催化剂对亚甲基蓝溶液的降解能力随回流温度和时间增加呈先增大后减小的规律变化,在130°C回流2 h所制备的磷酸铋光催化剂拥有最好的活性,表观动力学常数k为0.161 min^（-1）。通过乙二醇回流,能在磷酸铋表面引入了羟基基团,使磷酸铋在水中分散稳定性大幅提高。

英文摘要：

BiPO_4 photocatalysts were synthesized by refluxing in ethylene glycol,and the effects of reaction temperature and reaction time on the BiPO_4 crystal structure,morphology,and properties were investigated.The crystal form of BiPO_4 changed from hexagonal to monoclinic on refluxing in the solvent.The produced BiPO_4 photocatalysts showed good activities in photodegradation of methylene blue,and the activity could be adjusted by changing the refluxing temperature and time.BiPO_4 showed the best catalytic properties when the refluxing time was 2 h at 130 °C;the kinetic constant was 0.161 min~（-1）.The BiPO_4 dispersibility was still high after standing for 2 d,because of the introduction of surface hydroxy groups by refluxing in ethylene glycol.