One-pot solvothermal syntheses of ternary heterostructured TiO2-Bi2MoO6/Bi3.64Mo0.36O6.55 controllable in terms of composition, morphology and structure: Materials of high visible-light driven photocatalytic activity
One-pot solvothermal syntheses of ternary heterostructured TiO2-Bi2MoO6/Bi3.64Mo0.36O6.55 controllable in terms of composition, morphology and structure: Materials of high visible-light driven photocatalytic activity
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DOI：
10.1016/j.apcatb.2013.04.057
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发表时间：
2013-08-01
影响因子：
22.1
通讯作者：
Au, Chak-Tong
中科院分区：
文献类型：
--
作者：
Zou, Jian-Ping;Luo, Sheng-Lian;Au, Chak-Tong
采用一锅法无模板溶剂热法合成了新型三元异质结构TiO 2-Bi 2 MoO 6/Bi3.64Mo0.36O6.55。为了进行比较研究，同样合成了Bi 2 MoO 6、Bi3.64Mo0.36O6.55、Bi 2 MoO 6/Bi3.64Mo0.36O6.55、TiO 2-Bi 2 MoO 6和TiO2-Bi3.64Mo0.36O6.55。采用粉末X射线衍射、紫外-可见漫反射光谱、扫描电子显微镜、透射电子显微镜和拉曼光谱对催化剂进行了表征。实验结果表明，通过调节pH值、醇水比和TiO 2含量，可以很好地控制光催化剂的组成、形貌和结构。根据研究结果，我们提出了一个机制的材料。对罗丹明B（RhB）和邻硝基苯酚的光催化降解结果表明，光催化效率与材料的组成、形貌和结构密切相关。在可见光驱动下，5%TiO2-Bi 2 MoO 6/Bi3.64Mo0.36O6.55对RhB和邻硝基苯酚的光催化降解活性远高于TiO 2、Bi 2 MoO 6、Bi3.64Mo0.36O6.55及其任意组合.最后，提出了异质结构材料光催化作用的新机理。总的来说，该研究提供了一种新的反应模式来解释有效的界面电荷转移和显着提高光催化效率的三元异质结构复合材料。(C)2013年由Elsevier B. V.出版
Novel ternary heterostructured TiO2-Bi2MoO6/Bi3.64Mo0.36O6.55 were synthesized by a one-pot template-free solvothermal method. For comparison studies, Bi2MoO6, Bi3.64Mo0.36O6.55, Bi2MoO6/Bi3.64Mo0.36O6.55, TiO2-Bi2MoO6, and TiO2-Bi3.64Mo0.36O6.55 were also synthesized likewise. The photocatalysts were characterized by powder X-ray diffraction, UV-vis diffuse reflectance spectroscopy, scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. The experimental results showed that the composition, morphology and structure of the photocatalysts can be well controlled by adjusting the pH value, alcohol/water ratio, and TiO2 content. Based on the findings, we put forward a mechanism for the formation of the materials. Furthermore, the results of photocatalytic degradation of Rhodamine B (RhB) and o-nitrophenol over the as-prepared materials indicate that photocatalytic efficiency can be closely related to the composition, morphology and structure of the materials. The ternary heterostructured 5%TiO2-Bi2MoO6/Bi3.64Mo0.36O6.55 exhibits good visible-light driven photocatalytic activity in the degradation of RhB and o-nitrophenol, much higher than those of TiO2, Bi2MoO6, Bi3.64Mo0.36O6.55, and any combination of the three. Finally, a new mechanism for the photocatalytic action of the heterostructured materials was put forward. Overall, the investigation provides a new reaction mode to explain the effective interfacial charge transfer and the significant improvement in photocatalytic efficiency of the ternary heterostructured composites. (C) 2013 Published by Elsevier B.V.