中文摘要：

结合固相反应与水热法制得一种新型的光催化剂Na2Ta2O6,通过XRD、SEM对样品进行表征,并且研究了时间、温度及pH值等制备因素对样品形貌的影响.研究发现Na2Ta2O6样品为一种特殊的棒状结构.内部是由颗粒组成的絮状物.延长水热处理时间或升高温度,样品表面会变得越来越光滑.前驱体在150℃于不同pH值下水热处理24 h后,其形貌将发生很大的变化.当pH=13时Na2Ta2O6样品仍保持特殊的棒状结构.pH=9时,则棒完全由立方小颗粒组成.而pH=7时,棒状结构遭到破坏,变为不规则的颗粒.

英文摘要：

A novel Na_2Ta_2O_6 photocatalyst was preparaed by a combined solid-state reaction and hydrothermal approach.The samples were characterized by powder XRD and SEM,and the morphology were studied at different time,temperature and pH.The results showed that Na_2Ta_2O_6 were clava with floccule in the middle of it.The surface of Na_2Ta_2O_6 would become more slippy if we prolong the hy hydrothermal time or heat up the precursor at higher temperature.The shape of Na_2Ta_2O_6 would change with the various pH valu...