Preparation and visible light photocatalytic activity of mesoporous N, S-codoped TiO2(B) nanobelts
Preparation and visible light photocatalytic activity of mesoporous N, S-codoped TiO2(B) nanobelts
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DOI：
10.1016/j.apsusc.2010.11.098
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发表时间：
2011-02
影响因子：
6.7
通讯作者：
Q. Xiao;Linli Ouyang;Lan Gao;Chi Yao
中科院分区：
文献类型：
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作者：
Q. Xiao;Linli Ouyang;Lan Gao;Chi Yao
采用水热法和后处理法制备了N，S共掺杂的TiO 2（B）纳米带，并通过X射线衍射（XRD）、透射电镜（TEM）、N2吸附-脱附（BET）、X射线光电子能谱（XPS）和紫外可见漫反射光谱（DRS）等手段对样品进行了表征。结果表明，所制备的样品具有介孔结构，在可见光区有较强的吸收，吸收边红移。以乙基黄原酸钾（KEX）为目标化合物，研究了N，S共掺杂介孔TiO 2（B）纳米带的可见光催化降解性能。结果表明，随着硫脲与Ti（R）摩尔比的增加，样品的光催化活性提高。当R=3时，N，S共掺杂TiO 2（B）样品TBLTS-3的光催化活性达到最大值。随着R的进一步增大，样品的光催化活性降低。N，S共掺杂TiO 2（B）纳米带的高光催化活性归因于可见光区的强吸收和电子/空穴对的低复合率之间的平衡。
The mesoporous N, S-codoped TiO2(B) nanobelts are synthesized via hydrothermal synthesis and post-treatment, and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), N2adsorption–desorption measurements (BET), X-ray photoelectron spectra (XPS), and UV–vis diffuse reflectance spectra (DRS). The results show that the prepared samples are mesoporous structured and exhibit stronger absorption in the visible light region with red shift in the absorption edge. The photocatalytic activity of N, S-codoped mesoporous TiO2(B) nanobelts is evaluated by the photocatalytic photodegradation of potassium ethyl xanthate (KEX) under visible light irradiation. It is found that the photocatalytic activity of the prepared samples increases with increasing the molar ratio of thiourea to Ti (R). At R=3, the photocatalytic activity of the N, S-codoped TiO2(B) sample TBLTS-3 reaches a maximum value. With further increasing R, the photocatalytic activity of the sample decreases. The high photocatalytic activity of N, S-codoped TiO2(B) nanobelts can be attributed to the balance between strong absorption in visible light region and low recombination rate of electron/hole pairs.