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首页> 外文期刊>Inorganic materials >Heat Treatment of Nanometer Anatase Powder and Its Photocatalytic Activity for Degradation of Acid Red B Dye under Visible Light Irradiation
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Heat Treatment of Nanometer Anatase Powder and Its Photocatalytic Activity for Degradation of Acid Red B Dye under Visible Light Irradiation

机译：纳米锐钛矿粉的热处理及其在可见光下降解酸性红B染料的光催化活性

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摘要

The phase transformation of nanometer TiO_2 powder from anatase to rutile was realized by heat treatment, and a new nanometer TiO_2 photocatalyst that could be excited by visible light was obtained. The heat-treated TiO_2 powder at different transition stage was characterized by powder x-ray diffraction, transmission electron microscopy, and Fourier transform infrared spectroscopy. The test of photocatalytic activity of the heat-treated TiO_2 powder was carried out by the photocatalytic degradation of acid red B dye in aqueous solution under visible light irradiation. The nanometer anatase TiO_2 heat-treated at 500℃ for 30 min exhibited much higher activity than those of pure anatase and mechanically mixed (anatase and rutile) TiO_2. The remarkable improvement of photocatalytic activity was mainly illustrated by the special interphase between rutile and anatase, which not only restrains the recombination of photogenerated electron-hole pairs but also reduces the adsorbability of nanometer anatase TiO_2 powder to a certain extent. More significantly, the anticipatory interlaced energy level of heat-treated TiO_2 particles is convenient for capturing photons of low energy and thus achieves the intention of using visible light.
机译：通过热处理实现了纳米TiO_2粉末从锐钛矿到金红石的相变，得到了一种新型的可被可见光激发的纳米TiO_2光催化剂。通过粉末X射线衍射，透射电子显微镜和傅里叶变换红外光谱对不同阶段的热处理后的TiO_2粉末进行了表征。通过在可见光照射下水溶液中酸性红B染料的光催化降解来进行热处理的TiO_2粉末的光催化活性测试。在500℃下热处理30min的纳米锐钛矿TiO_2的活性明显高于纯锐钛矿和机械混合（锐钛矿和金红石）TiO_2的活性。金红石与锐钛矿之间特殊的相变说明了光催化活性的显着提高，这不仅抑制了光生电子-空穴对的重组，而且在一定程度上降低了纳米锐钛矿TiO_2粉末的吸附性。更重要的是，经过热处理的TiO_2颗粒的预期隔行扫描能级便于捕获低能光子，从而达到使用可见光的目的。

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