Bi_2W_xMo_(1-x)O_6固溶体制备及光催化降解有机废水

光催化剂可用于催化降解有机污染废水,在废水处理方面具有良好的发展前景。分别以乙二醇、去离子水为溶剂,采用水热法在较低温度下合成Bi_2W_xMo_(1-x)O_6固溶体,并用XRD、SEM等对产物的形貌和结构进行表征,通过对罗丹明B的降解测试固溶体光催化降解活性。结果表明,随着W与Mo原子比(R_((W/Mo)))的增加,Mo~(6+)离子逐步被W~(6+)替代,生成了无限互溶的固溶体,光催化性能也随之发生变化,其中,以去离子水为溶剂合成的固溶体在R_((W/Mo))=1.0时降解率最高,达到98%。

Preparation of Bi2WxMo1-xO6 solid solution and its photocatalytic activity for degradation of organic wastewater

Photocatalyst has been widely used for refractory organic wastewater treatment with some advantages.In this work,Bi₂W_xMo_1-xO₆ solid solution was prepared at low temperature by hydrothermal method using ethylene glycol and deionized water as solvent,respectively.Morphology and structure of the catalyst were characterized by SEM and XRD.The Rhodamine B solution was selected as simulated wastewater to evaluate photocatalytic degradation activity of the catalyst.The results show that,with the increase of R_(W/Mo),Mo⁶⁺ ions are gradually replaced by W⁶⁺.The samples exhibit different performance with the change of R_(W/Mo) atomic ratio.Highest degradation efficiency is achieved over solid solution prepared at R_(W/Mo)=1.0.