Facile synthesis of TiO2/trititanate heterostructure with enhanced photoelectric efficiency for an improved photocatalysis
Facile synthesis of TiO2/trititanate heterostructure with enhanced photoelectric efficiency for an improved photocatalysis
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轻松合成 TiO2/三钛酸酯异质结构，提高光电效率，改善光催化性能
DOI：
10.1016/j.apsusc.2015.02.182
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发表时间：
2015-06
影响因子：
6.7
通讯作者：
Pengfei Fang
中科院分区：
文献类型：
--
作者：
Feitai Chen;Youji Li;Zhi Liu;Pengfei Fang
采用碱水热法制备了TiO 2/三钛酸盐光催化剂，并通过透射电镜、X射线衍射、拉曼等手段对其进行了表征，以罗丹明B（RhB）为目标染料，评价了催化剂的光催化降解活性。结果表明，通过表面TiO 2转化为三钛酸盐，可以直接形成异质结构。由于在制备的催化剂表面上形成了大量的羟基，与原始TiO 2相比，偶联纳米结构具有增强的对RhB的吸附能力。此外，生成的三钛酸盐可以成功地在耦合复合物中引入浅能级，从而提高光生电子-空穴对的分离效率。在降解实验中，TiO 2/trititanate表现出比裸TiO 2更高的光催化活性。这种耦合纳米结构在吸附能力和光电效率方面的优势使其在有机污染物的去除方面有着更广泛的应用。
TiO2/trititanate photocatalyst was prepared by alkaline hydrothermal treatment of TiO2, and characterized by transmission electron microscopy, X-ray diffraction, and Raman etc. The photocatalytic activities of catalysts were evaluated by the photocatalytic degradation of rhodamine B (RhB). It is found that the heterostructure can be directly formed via the conversion of surface TiO2into trititanate. The coupled nanostructure possesses enhanced adsorption ability for RhB as compared with the raw TiO2, owing to the formation of an increased amount of hydroxyl groups on the prepared catalyst surface. Besides, the generated trititanate can successfully introduce a shallow energy level in the coupled composite, which results in the improvement of separation efficiency of photoinduced electron–hole pairs. In the degradation experiments, TiO2/trititanate exhibits much higher photocatalytic activity than the bare TiO2. These advantages of the coupled nanostructure in adsorption capacity and photoelectric efficiency may make it a wider application for the removal of organic pollutants.
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