A Facile Microwaving Method to Turn Titanium Oxide Into Highly Active Ti3+ Self-Doped Structure.
A Facile Microwaving Method to Turn Titanium Oxide Into Highly Active Ti3+ Self-Doped Structure.
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一种简便的微波方法将二氧化钛转化为高活性 Ti3 自掺杂结构。
DOI：
10.1166/jnn.2016.12364
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发表时间：
2016
影响因子：
--
通讯作者：
Aoneng Cao
中科院分区：
文献类型：
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作者：
Kai Han;Xin Zhang;Haifang Wang;Yuanfang Liu;Aoneng Cao
二氧化钛是研究最多的光催化剂之一，其应用受限于对紫外线的吸收区域。自掺杂是迈向可见光区域的一种有前景的方法。在此，我们报道了一种简便的制备Ti³⁺自掺杂二氧化钛的方法。通过简单地将商用晶体二氧化钛P25的水悬浮液微波处理几分钟，然后进行离心和干燥处理，我们能够将P25转化为Ti³⁺自掺杂材料。经微波处理的二氧化钛的紫外 - 可见光谱在可见光区域显示出良好的吸收范围。通过电子顺磁共振（EPR）检测到了Ti³⁺的存在，并且如高分辨率透射电子显微镜（HRTEM）图像所示，掺杂甚至导致了部分无定形结构。这种Ti³⁺自掺杂二氧化钛在可见光照射下对罗丹明B的降解表现出高的光催化活性，一级速率常数为0.0957 min⁻¹，比P25高出90多倍。在碱性条件下微波处理显示出比酸性条件下更好的光催化活性。研究了经微波处理的二氧化钛的形成机制，并提出了一种合理的机制。
The application of titanium oxide, one of the most studied photocatalysts, is imprisoned in UVabsorbing.areas. Self-doping is a promising way towards the visible light zone. Herein, we report.a facile method to produce a Ti3+ self-doped titanium oxide. By simply microwaving the aqueous.suspension of the commercial crystalline titanium oxide, P25, for a few minutes with follow-up centrifugation.and drying processes we are able to turn P25 into a Ti3+ self-doped material. UV-vis.spectrum of the microwave-treated titanium oxide shows a good absorbing extension in visible light.region. The existence of Ti3+ was detected by Electron Paramagnetic Resonance (EPR), and doping.even caused partial amorphous structure as shown in High Resolution Transmission Electron.Microscopy (HRTEM) image. This Ti3+ self-doped titanium oxide shows a high photocatalytic activity.for degradation of rhodamine B under visible light irradiation with a first-order rate constant of.0.0957 min−1, which is more than 90-fold higher than that of P25. Microwaving at alkaline condition.showed better photocatalytic activity than at acid condition. The formation mechanism of the.microwave-treated titanium oxide was studied and a plausible mechanism was proposed.