WO_(3)/g-C_(3)N_(4)复合光催化剂的制备及性能研究

Preparation and Properties of WO_(3)/g-C_(3)N_(4) Composite Photocatalyst

采用溶剂热法合成具有Z型异质结构的WO_(3)/g-C_(3)N_(4)复合光催化材料,采用XRD、XPS、SEM等表征测试了材料的组成、形貌等,考察其光催化性能及对盐酸四环素(TC)的降解能力,并研究了WO_(3)/g-C_(3)N_(4)的降解机理.与WO_(3)、g-C_(3)N_(4)相比,WO_(3)/g-C_(3)N_(4)复合材料降解效果明显提高,其中WCN-3(WO_(3)/g-C_(3)N_(4)-3)的催化能力最优.复合材料光催化活性增强可归因于其较大的比表面积为光催化反应提供了更多的活性位点.PL测试结果显示复合材料中光生电子-空穴复合被显著抑制,自由基捕获实验证实参与光催化降解的主要活性成分是超氧基自由基(·O^(-)_(2))和空穴(h^(+)).

In this paper,WO_(3)/g-C_(3)N_(4) Z-scheme heterojunction is successfully synthesized by solvothermal method.XRD,XPS and SEM are used to characterize the composition and morphology of the materials,whereas the photocatalytic performance and their ability to degrade tetracycline hydrochloride(TC)are tested.Compared with WO_(3) and g-C_(3)N_(4),the degradation effect of WO_(3)/g-C_(3)N_(4) are significantly improved and WCN-3(WO_(3)/g-C_(3)N_(4)-3)have the best ability.The enhanced photocatalytic activity of composite material can be attributed to its larger specific surface area,which provides more active sites.PL also shows that electron-hole pair recombination is obvious restrained.In addition,radicals capture experiments confirm that the main active components of photocatalytic degradation are superoxide ion radicals(·O^(-)_(2))and holes(h^(+)).