论文部分内容阅读
采用水热法合成90%以上高暴露单晶面TiO_2(001)、(101)和(010),并通过光沉积方法负载贵金属Ag,光照20 min后,由于不同晶面具有不同的原子排布和电子结构,其负载的Ag的粒径不同,TiO_2-101晶面上Ag的粒径为(12.5±5)nm,TiO_2-010晶面上Ag的粒径为(17.5±5)nm,而TiO_2-001晶面上Ag的粒径为(25±15)nm。可见光催化降解罗丹明B(Rh B)实验表明,不同晶面负载Ag后降解能力不同;荧光及瞬态荧光表明,Ag/TiO_2-010的电子空穴复合弱于Ag/TiO_2-001及Ag/TiO_2-101,故其光催化降解速率为1.032 h-1,强于后两者;固体紫外分析显示,Ag的粒径越小,表面等离子体共振(SPR)效应越强,Ag/TiO_2-101的光催化活性强于Ag/TiO_2-001;自由基捕获结果表明,Ag/TiO_2-001、Ag/TiO_2-101和Ag/TiO_2-010降解Rh B的主要活性自由基是空穴(h+)和羟基自由基(·OH)。
Hydrothermal synthesis of more than 90% of the highly exposed single crystal TiO 2 (001), (101) and (010), and the noble metal Ag by light deposition method, light 20 min, due to different crystal planes have different atomic arrangement And the electron structure, the particle size of Ag loaded on the TiO_2-101 was different from that on the TiO_2-101 (12.5 ± 5) nm and that of Ag on TiO_2-010 was (17.5 ± 5) nm The particle size of Ag on TiO_2-001 is (25 ± 15) nm. Visible photocatalytic degradation of rhodamine B (Rh B) experiments show that the different crystal face loaded Ag after the degradation capacity; Fluorescence and transient fluorescence show that the electron / hole recombination of Ag / TiO 2-010 is weaker than Ag / TiO_2-001 and Ag / TiO_2-101, the photocatalytic degradation rate was 1.032 h-1, which was stronger than the latter two. The solid-state UV analysis showed that the smaller the particle size of Ag was, the stronger the surface plasmon resonance (SPR) effect was and the lower the Ag / TiO_2-101 The photocatalytic activity of RhB was stronger than that of Ag / TiO_2-001. The results of free radical trapping showed that the main active free radicals of RhB degraded by Ag / TiO_2-001, Ag / TiO_2-101 and Ag / TiO_2-010 were H (h +) and Hydroxyl radical (· OH).