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首页> 外文期刊>Materials Science and Engineering. B, Solid-State Materials for Advanced Technology >Sol-gel auto-combustion synthesis of samarium-doped TiO_2 nanoparticles and their photocatalytic activity under visible light irradiation
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Sol-gel auto-combustion synthesis of samarium-doped TiO_2 nanoparticles and their photocatalytic activity under visible light irradiation

机译：mar掺杂TiO_2纳米粒子的溶胶-凝胶自燃烧合成及其在可见光下的光催化活性

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摘要

High photocatalytic activity of Sm~(3+)-doped TiO_2 nanocrystalline under visible light has been successfully prepared by sol-gel auto-combustion technique. The samples were characterized by X-ray diffraction, UV-vis diffuse reflectance spectroscopy and photoluminescence (PL) spectra. UV-vis diffuse reflectance spectra showed a slight shift to longer wavelengths and an extension of the absorption in the visible region for almost all the samarium-doped samples, compared to the non-doped sample. The results of photocatalytic decomposition of methylene blue (MB) over 0.5 mol% Sm~(3+)-TiO_2 prepared at various calcinations temperatures show that the sample calcinated at 600℃ consists of mixed phases with 51.61% rutile shows the highest photocatalytic activity, which suggests the existence of a synergistic effect between anatase and rutile powders under visible light. Doping with the samarium ions significantly enhanced the overall photocatalytic activity for MB degradation under visible light irradiation because the larger specific surface area and the higher separation efficiency of electron-hole pairs were obtained simultaneously for Sm~(3+)-doped TiO_2 nanocrystalline. It was found that there were certain relationships between PL spectra and photocatalytic activity, namely, the stronger the PL intensity, the larger the content of oxygen vacancies and defects, the higher the photocatalytic activity. Therefore, in this study, 0.5 mol% may be the most suitable content of Sm~(3+) in the titania, at which the recombination of photoinduced electrons and holes could be effectively inhibited and thereby the highest photocatalytic activity is formed.
机译：通过溶胶-凝胶自燃技术成功制备了Sm〜（3+）掺杂的TiO_2纳米晶在可见光下的高光催化活性。通过X射线衍射，紫外可见漫反射光谱和光致发光（PL）光谱对样品进行表征。与未掺杂样品相比，几乎所有all掺杂样品的紫外可见漫反射光谱均显示出向较长波长的轻微偏移，并且可见区吸收范围有所扩展。 0.5 mol％Sm〜（3 +）-TiO_2在不同的煅烧温度下对亚甲基蓝（MB）的光催化分解结果表明，在600℃煅烧的样品由混合相组成，金红石占51.61％，具有最高的光催化活性。这表明在可见光下锐钛矿和金红石粉之间存在协同作用。掺S离子可显着提高可见光照射下MB降解的总体光催化活性，因为同时掺杂Sm〜（3+）的TiO_2纳米晶具有较大的比表面积和较高的电子-空穴对分离效率。发现PL光谱与光催化活性之间存在一定的关系，即PL强度越强，氧空位和缺陷的含量越大，光催化活性越高。因此，在本研究中，二氧化钛中Sm〜（3+）的最合适含量为0.5 mol％，可以有效抑制光致电子和空穴的复合，从而形成最高的光催化活性。

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