A fast and effective method for N-doping TiO2 by post treatment with liquid ammonia: visible light photocatalysis
A fast and effective method for N-doping TiO2 by post treatment with liquid ammonia: visible light photocatalysis
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DOI：
10.1016/j.tsf.2014.04.067
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发表时间：
2014-07-01
期刊：
影响因子：
2.1
通讯作者：
Parkin, Ivan P.
中科院分区：
文献类型：
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作者：
Powell, Michael J.;Palgrave, Robert G.;Parkin, Ivan P.
用溶胶凝胶法制备的二氧化钛薄膜经液氨后处理和500℃热处理后进行了氮掺杂，X射线衍射和拉曼光谱表征表明，所有样品中都保留并存在锐钛矿晶型。扫描电子显微镜显示，液氨处理对薄膜的形貌没有明显影响。在滤光条件下的功能测试包括水接触角，以及对重天青和硬脂酸的光破坏，结果表明氨处理的样品与纯的二氧化钛和空白对照相比是活性的可见光催化剂。X射线光电子能谱研究表明，间隙氮的存在(N-1s=400 eV)表明，光催化活性增强的原因很可能是由于间隙氮的掺入产生了氧空位。这种合成方法利用一种简单、廉价和高效的后处理路线来制备N-掺杂二氧化钛，并产生可见光催化剂，在自清洁和医疗保健环境中具有潜在的应用前景。(C)2014爱思唯尔B.V.保留所有权利。
TiO2 thin films prepared by sol-gel synthesis were N-doped by post treating with liquid ammonia and annealing at 500 degrees C. Characterisation by X-ray diffraction and Raman spectroscopy confirmed that the anatase crystal type was retained and present in all samples. Scanning electron microscopy showed that treatment with liquid ammonia had no significant effect on the film morphology. Functional testing under filtered while light conditions involving water contact angle, and the photo destruction of both Resazurin and Stearic acid showed the ammonia treated samples to be active visible light photocatalysts in contrast to the pure TiO2 and the blank controls. X-ray Photoelectron Spectroscopy studies indicate the presence of interstitial nitrogen (N-1s= 400 eV) suggesting that the origin of the enhanced photocatalytic activity is most likely due to oxygen vacancies created by the interstitial nitrogen incorporation. This synthesis method utilises a simple, inexpensive and highly effective post treatment route to N-dope TiO2 and produces visible light photocatalysts with potential applications in self-cleaning and healthcare environments. (C) 2014 Elsevier B.V. All rights reserved.