g-C_(3)N_(4)/TiO_(2)纳米棒阵列薄膜的制备及光催化性能研究

Preparation and photocatalytic performance of g-C_(3)N_(4)/TiO_(2) NRAs

为了提高经典光催化剂TiO_(2)的可见光催化活性,以水热法和真空浸渍煅烧法制备了具有优异催化性能的石墨相氮化碳/TiO_(2)纳米棒阵列薄膜(g-C_(3)N_(4)/TiO_(2) NRAs)。通过X射线衍射、扫描电镜、X射线光电子能谱技术、紫外-可见光和光电化学等测试对样品进行表征。结果表明:g-C_(3)N_(4)包裹在TiO_(2)纳米棒表面,复合薄膜具有良好的可见光响应能力。在可见光照射180min后,g-C_(3)N_(4)/TiO_(2)NRAs降解偏二甲肼(UDMH)废水的效率是单纯TiO_(2)的2倍,其光催化性能的提高一方面是因为催化剂对可见光响应能力的提高,另一方面是因为异质结的形成有效地促进了光生电子和空穴的分离。此外,g-C_(3)N_(4)与TiO_(2)NRAs的复合研究也为光催化降解UDMH废水提供了一种易回收且不易引起二次污染的新思路。

In order to enhance the photocatalytic activity under visible light of the classic photocatalyst TiO_(2),g-C_(3)N_(4)/TiO_(2) nanoarray films(g-C_(3)N_(4)/TiO_(2) NRAs)with excellent catalytic properties were prepared by hydrothermal method and vacuum impregnation calcination method.The samples were characterized by XRD,SEM,XPS,UV-Vis and photoelectrochemical tests.The results showed that g-C_(3)N_(4) was successfully coated on the surface of TiO_(2) nanorods with good photocatalytic performance under visible light.After 180min of visible light irradiation,the efficiency of g-C_(3)N_(4)/TiO_(2) NRAs to degrade unsymmetrical dimethylhydrazine(UDMH)wastewater was twice that of TiO_(2).The improved photocatalytic performance was due to the improved response of the catalyst to visible light on the one hand,and the formation of heterojunction on the other hand,which effectively promoted the separation of photogenerated electrons and holes.In addition,the composite study of g-C_(3)N_(4) and TiO_(2) NRAs also provided a new way for the photocatalytic degradation of UDMH wastewater that was easy to recover and did not easily cause secondary pollution.