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以金红石相二氧化钛(Ti O2)粉体为原料,采用水热法合成了二氧化钛纳米管(Titania nanotubes,简写为TNTs),然后把H2PtCl6的无水乙醇溶液引入到TNTs中,得到镶嵌Pt的二氧化钛纳米管(Pt/TNTs)。利用透射电镜(TEM)、X射线衍射(XRD)和紫外-可见光谱(UV-Vis)对产物进行了表征,并重点研究了Pt/TNTs的光催化性能。结果表明,有直径约为3 nm的Pt纳米粒子插入到了TNTs中,且Pt粒子以Pt单质的形式存在。Pt/TNTs在可见光区域表现出较强的吸收,并且其起始吸收带边发生明显红移。紫外光催化降解甲基橙实验结果表明,金红石相Ti O2,TNTs和Pt/TNTs对甲基橙溶液的降解率分别达到46.8%,57.2%和84.6%,Pt/TNTs的光催化活性较金红石相二氧化钛粉体和纯TNTs有显著的提高。
Titania nanotubes (abbreviated as TNTs) were synthesized by hydrothermal method using rutile titanium dioxide (Ti O2) powder as raw material, and then introduced into TNTs with anhydrous ethanol solution of H2PtCl6 to obtain titania nano-particles Tube (Pt / TNTs). The products were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and UV-Vis spectroscopy. The photocatalytic properties of Pt / TNTs were also studied. The results showed that Pt nanoparticles with a diameter of about 3 nm were inserted into the TNTs and the Pt particles were in the form of Pt. Pt / TNTs showed a strong absorption in the visible region and a significant red shift of the initial absorption band edge. The photocatalytic degradation of methyl orange by ultraviolet light showed that the degradation rates of methyl orange solution of rutile phase Ti O2, TNTs and Pt / TNTs were 46.8%, 57.2% and 84.6%, respectively. The photocatalytic activity of Pt / TNTs was lower than that of rutile phase Titanium dioxide powder and pure TNTs significantly improved.