K2Ta2O6光催化剂的水热法制备及其光催化性能

以Ta2O5和KOH为原料采用水热法系统地制备了钽酸钾光催化剂。通过XRD、SEM、UV-Vis漫反射等测试手段对样品进行表征,探讨了反应时间、温度、KOH浓度等实验条件对结晶性能和形貌的影响。实验结果表明,水热温度为180℃,反应时间为24h,KOH浓度0.5mol/L条件下合成了结晶完善、粒径200nm左右的焦绿石相K2Ta2O6,其形貌是正八面体形;这种结构能有效地提高K2Ta2O6对藏红T溶液的光催化降解效率。

Hydrothermal synthesis of K2Ta2O6 and its photocatalysis property

A series of K2Ta2O6 photocatalysts were prepared by a hydrothermal method using Ta2O5 and KOH as raw materials.The as-obtained samples were characterized by XRD,SEM,UV-Vis and so on.The effect of reaction parameters on the crystallization and morphology of samples was investigated such as reaction time,temperature,as well as KOH concentration.The SEM result showed that the particle size was of about 200nm with octahedral shape.That the optimum reaction conditions are as follows: reaction temperature is 180℃,reaction time is 24h,KOH concentration 0.5mol/L.And the performance of K2Ta2O6 photocatalytic on degradation of safranine T was studied.The result shows K2Ta2O6 prepared has a high photocatalytic activity under ultraviolet irradiation.