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首页> 外文期刊>Environmental Science & Technology >Enhanced Photocatalytic Degradation of Dye Pollutants under Visible Irradiation on Al(Ⅲ)-Modified TiO_2: Structure, Interaction, and Interfacial Electron Transfer
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Enhanced Photocatalytic Degradation of Dye Pollutants under Visible Irradiation on Al(Ⅲ)-Modified TiO_2: Structure, Interaction, and Interfacial Electron Transfer

机译：Al（Ⅲ）修饰的TiO_2在可见光下增强的染料污染物的光催化降解：结构，相互作用和界面电子转移

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Aluminum(Ⅲ)-modified TiO_2 was prepared by sol-gel process via a sudden gelating method. The structure of the modified material and the local environment of aluminum were investigated using X-ray diffraction, HRTEM, XPS, ~(27)AI MAS NMR, and ξ-potential measurements. The effect of the aluminum modification on interaction between the dye and photocatalyst, the interfacial electron transfer process, and thereby the degradation of dye pollutants under visible irradiation were also examined by FTIR spectra and UV-vis diffuse reflectance spectra. It was found that, rather than incorporating into the crystal lattice of TiO_2, the aluminum forms an overlayer of Al_2O_3 on the surface of TiO_2 interfaced with Ti-O-Al bonds. It is interesting that the carboxylate-containing dyes such as Rhodamine B (RhB) adsorb preferentially on the Al_2O_3, rather than the Ti(Ⅳ) sites on the surface of TiO_2. The photodegradation rate observed for RhB is nearly 5-fold faster than that obtained in the pristine TiO_2 system. The photodegradation of dyes on the aluminum(Ⅲ)-modified photocatalyst is of great dependence on the structure and anchoring group of the dyes. Structure with carboxylate as anchoring group and amino group as electron donor is favorable for degradation. The mechanistic details are discussed on the basis of experimental results.
机译：采用突然凝胶法，通过溶胶-凝胶法制备了铝（Ⅲ）改性的TiO_2。使用X射线衍射，HRTEM，XPS，〜（27）AI MAS NMR和ξ电位测量研究了改性材料的结构和铝的局部环境。还通过FTIR光谱和UV-vis漫反射光谱检查了铝改性对染料与光催化剂之间相互作用，界面电子转移过程以及由此可见光照射下染料污染物降解的影响。发现铝并没有掺入TiO_2的晶格中，而是在与Ti-O-Al键结合的TiO_2表面上形成了Al_2O_3的覆盖层。有趣的是，含羧酸盐的染料如罗丹明B（RhB）优先吸附在Al_2O_3上，而不是TiO_2表面的Ti（Ⅳ）位置上。 RhB的光降解速率比原始TiO_2系统快将近5倍。染料在铝（Ⅲ）改性的光催化剂上的光降解与染料的结构和锚定基团有很大的关系。以羧酸盐为锚定基团和氨基为电子给体的结构有利于降解。在实验结果的基础上讨论了机械细节。

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