Thermostable nitrogen-doped HTiNbO5 nanosheets with a high visible-light photocatalytic activity
Thermostable nitrogen-doped HTiNbO5 nanosheets with a high visible-light photocatalytic activity
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具有高可见光光催化活性的耐热氮掺杂HTiNbO5纳米片
DOI：
10.1007/s12274-011-0119-8
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发表时间：
2011-03
期刊：
影响因子：
9.9
通讯作者：
侯文华
中科院分区：
文献类型：
--
作者：
侯文华
摘要通过在四丁基氢氧化铵（TBAOH）中剥离层状HTiNbO 5得到HTiNbO 5纳米片，然后用尿素加热，成功地合成了氮掺杂的HTiNbO 5纳米片。采用X射线衍射（XRD）、透射电子显微镜（TEM）、扫描电子显微镜（SEM）、能谱仪（EDX）、X射线光电子能谱仪（XPS）、紫外-可见吸收光谱仪（UV-vis）和N2吸附-脱附等测试手段对样品进行了表征。结果发现，N掺杂导致更高的热稳定性的层状结构，本征带隙变窄和可见光响应。掺杂的氮原子主要位于TiNbO 5 −晶体的间隙位置，并与氢离子化学键合。与N掺杂的HTiNbO 5相比，N掺杂的HTiNbO 5纳米片具有更大的比表面积和更丰富的介孔性，这是由于纳米片的排列较为松散和不规则。N掺杂的层状HTiNbO 5和HTiNbO 5纳米片对罗丹明B（RhB）水溶液的降解表现出很高的可见光催化活性。此外，由于更大的表面积，更丰富的介孔性和更强的酸性，N掺杂的HTiNbO 5纳米片具有更高的活性比N掺杂的HTiNbO 5，虽然后者在可见光区有更强的吸收。染料分子主要降解为脂肪族有机化合物，并部分矿化为CO2和/或CO，而不是简单地脱色。光敏化效果不明显，RhB主要通过典型的光催化反应途径降解。提出了两种不同的反应路线，RhB在可见光照射下的N掺杂的HTiNbO 5纳米片的光降解。本方法可扩展到大量具有插层和剥离特性的层状金属氧化物，从而为制备高效和潜在实用的可见光光催化剂提供了新的机会。
AbstractNitrogen-doped HTiNbO5 nanosheets have been successfully synthesized by first exfoliating layered HTiNbO5 in tetrabutylammonium hydroxide (TBAOH) to obtain HTiNbO5 nanosheets and then heating the nanosheets with urea. The resulting samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Energy-dispersive X-ray (EDX), X-ray photoelectron spectroscopy (XPS), UV-vis spectroscopy and N2 adsorption-desorption measurements. It was found that N-doping resulted in a much higher thermostability of the layered structure, intrinsic bandgap narrowing and a visible light response. The doped nitrogen atoms were mainly located in the interstitial sites of TiNbO5− lamellae and chemically bound to hydrogen ions. Compared with N-doped HTiNbO5, N-doped HTiNbO5 nanosheets had a much larger specific surface area and richer mesoporosity due to the rather loose and irregular arrangement of titanoniobate nanosheets. Both N-doped layered HTiNbO5 and HTiNbO5 nanosheets showed a very high visible-light photocatalytic activity for the degradation of rhodamine B (RhB) aqueous solution. Moreover, due to the considerably larger surface area, richer mesoporosity and stronger acidity, N-doped HTiNbO5 nanosheets had an even higher activity than N-doped HTiNbO5, although the latter had a stronger absorption in the visible region. The dye molecules were mainly degraded to aliphatic organic compounds and partially mineralized to CO2 and/or CO, rather than being simply decolorized. The effect of photosensitization was insignificant and RhB was degraded mainly via the typical photocatalytic reaction routes. Two different reaction routes for the photodegradation of RhB under visible light irradiation over N-doped HTiNbO5 nanosheets have been proposed. The present method can be extended to a large number of layered metal oxides that have the characteristics of intercalation and exfoliation, thus providing new opportunities for the fabrication of highly effective and potentially practical visible-light photocatalysts.
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DOI：
10.1002/chin.200430022
发表时间：
2004-07
期刊：
ChemInform
影响因子：
--
作者：
O. Diwald;T. Thompson;T. Zubkov;Edward G. Goralski;S. Walck;J. Yates
通讯作者：
O. Diwald;T. Thompson;T. Zubkov;Edward G. Goralski;S. Walck;J. Yates
TiO2 水分散体中磺基罗丹明 B 染料的可见光辅助光降解中中间体的形成和鉴定
DOI：
--
发表时间：
--
期刊：
Environ. Sci. Technol.
影响因子：
--
作者：
Chuncheng Chen;Wei Zhao;Jingyi Li;Jincai Zhao*
通讯作者：
Jincai Zhao*
影响因子：
7.3
作者：
Yan, Hongjian;Yang, Jinhui;Li, Can
通讯作者：
Li, Can
影响因子：
3.3
作者：
Diwald, O;Thompson, TL;Yates, JT
通讯作者：
Yates, JT
双功能N掺杂介孔TiO2光催化剂
影响因子：
3.7
作者：
Fang, Jun;Wang, Fang;Huang, Weixin
通讯作者：
Huang, Weixin