One-step synthesis of Zn doped titania nanotubes and investigation of their visible photocatalytic activity
One-step synthesis of Zn doped titania nanotubes and investigation of their visible photocatalytic activity
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DOI：
10.1016/j.matchemphys.2015.04.038
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发表时间：
2015-06-15
影响因子：
4.6
通讯作者：
Kar, Kamal K.
中科院分区：
文献类型：
--
作者：
Benjwal, Poonam;Kar, Kamal K.
在新制备的氟化锌（ZnF2）和乙二醇（EG）水溶液中，通过一步阳极氧化法制备了高取向未掺杂和掺锌二氧化钛（TiO2）纳米管。XRD和拉曼光谱揭示了TiO2纳米管的锐钛矿相特征，没有明显的掺杂相关峰。SEM和AFM观察证实了纳米管的形成，并发现掺杂Zn并未使TiO2的管状形貌发生扭曲。用能量色散x射线和x射线光谱学证实了锌的掺杂。由于一步阳极氧化过程，Zn2+离子被掺入到TiO2纳米管的主体中，而不是表面掺杂。随着纳米管中Zn掺杂量的增加，TiO2 （2.84 eV）的带隙逐渐减小。光致发光测试表明，掺杂Zn增加了载流子的数量，最终提高了TiO2纳米管的光催化活性。与未掺杂的纳米管相比，所制备的掺杂锌纳米管在可见光下对亚甲基蓝的降解表现出优异的光催化活性（反应速率常数k = 0.19 min(-1)）。(C) 2015 Elsevier B.V.版权所有
Highly oriented undoped and Zn-doped titania (TiO2) nanotubes were electrochemically fabricated by one-step anodization of titanium foil in a freshly prepared aqueous solution of zinc fluoride (ZnF2) and ethylene glycol (EG). XRD and Raman spectroscopy unveiled the typical characteristic of anatase phase of TiO2 nanotube without any distinct dopant related peaks. SEM and AFM observation confirmed the formation of nanotubes and revealed that the Zn doping did not distort the tube morphology of TiO2. The doping of Zn was confirmed by energy dispersive X-ray as well as X-ray photospectroscopy. Due to one-step anodization process, instead of surface doping, the Zn2+ ions were incorporated into the bulk of TiO2 nanotubes. With increasing Zn doping in nanotubes, a gradual decrease in the band gap of TiO2 (2.84 eV) was observed. Photoluminescence measurements revealed that the doping of Zn enhanced the number of charge carriers, which eventually boosted the photocatalytic activity of TiO2 nanotubes. Compared to undoped nanotubes, the as prepared Zn-doped TiO2-nanotubes showed excellent photocatalytic activity for methylene blue degradation (reaction rate constant k = 0.19 min(-1)) under visible light irradiation. (C) 2015 Elsevier B.V. All rights reserved.