Visible light photochemical activity of heterostructured PbTiO3-TiO2 core-shell particles

Li Li; Yiling Zhang; Andrew M. Schultz

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Visible light photochemical activity of heterostructured PbTiO3-TiO2 core-shell particles

机译：异质化PBTIO3-TIO2核心壳颗粒的可见光光化学活性

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Heterostructured powders composed of microcrystalline PbTiO3 cores coated with nanostructured TiO2 shells were prepared by a sol-gel method. When exposed to visible light (λ >420 nm), the heterostructured powder degrades methylene blue at a rate 4.8 times greater than PbTiO3, TiO2, or mechanical mixtures of the phases. The rate at which the heterostructured powder degrades methylene blue depends on the processing temperature; samples annealed at 500 °C are the most reactive, even though they do not have the highest surface area. Enhanced degradation rates were not observed for Pb-doped TiO2, indicating that it is the core-shell architecture and not contamination by lead that increases the reactivity. The improved reactivity of microcrystalline-PbTiO3/nanostructured-TiO2 heterostructures in visible light is attributed to visible light absorption in the PbTiO3 core, charge separation at the buried interface between the ferroelectric PbTiO3 and the dielectric TiO2, and dye degradation on the nanostructured TiO2 shell.

机译：通过SOL-GEL方法制备了由带有纳米结构TiO2壳涂层的微晶PBTIO3核心组成的异质粉。当暴露于可见光（λ> 420 nm）时，异质化粉末以比PBTIO3，TIO2或机械混合物大4.8倍的速率降解甲基蓝。异质化粉末降解甲基蓝的速率取决于加工温度;在500°C下退火的样品是最具反应性的，即使它们没有最高的表面积。对于掺杂PB的TIO2，未观察到增强的降解速率，表明它是核心壳结构，而不是铅污染的降解率会增加反应性。在可见光下，微晶PBTIO3/纳米结构的TIO2异质结构的反应性提高归因于PBTIO3核心中可见光吸收，在铁电PBTIO3和介电性TIO2和DIEE DEE DENGRADADATION之间埋入的界面上的电荷分离，以及Nananostrust in nananostruction nananostruction tio2 tio2 tio2 tio2 tio2。

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《Catalysis science & technology》 |2012年第9期|1945-1952|共8页
作者
Li Li; Yiling Zhang; Andrew M. Schultz;
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作者单位

Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA, USA.;

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原文格式 PDF
正文语种英语
中图分类汉语教学;
关键词
Sol-gel process; Photochemicals; mechanical mixturesCore-shell particlesVisible Lightsurface areaMethylene Bluecontainment structure;

机译：溶胶 - 凝胶工艺;光化学;机械混合孔壳颗粒可浏览的光明面芳二基蓝色固定结构;

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Visible light photochemical activity of heterostructured PbTiO3-TiO2 core-shell particles

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