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首页> 外文期刊>Journal of nano research >Synthesis, Structure, Optic and Photocatalytic Properties of Anatase/Brookite Nanocomposites
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Synthesis, Structure, Optic and Photocatalytic Properties of Anatase/Brookite Nanocomposites

机译：锐钛矿/ Broughite纳米复合材料的合成，结构，光学性和光催化性能

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Anatase/brookite nanocomposites were fabricated by the classical method of hydrolysis, additionally using hydrothermal treatment of preformed titanium dioxide sol with tetrabutyl orthotitanate. The influence of hydrothermal processing the buffer solution of TiO2 synthesis on the average particle sizes, specific surface area, pore sizes distributions, optical and photocatalytic properties investigated by X-ray diffraction, low-temperature nitrogen adsorption and UV-Vis spectroscopy. It has been determined that the hydrothermal treatment of pre-prepared titania sol as hydrolysis product leads to formation of rutile after annealing at 400 degrees C. Respective model of forming anatase/brookite/rutile nanocomposites was proposed. The changes of bang gap energy of TiO2 were observed and explained by effect of change phase composition and particles size of nanocomposite particles. Methylene blue (MB) photo-oxidation reactions using titanium dioxide nanocomposite were analyzed. Maximal photocatalytic activity of MB oxidation was detected for material with the ratio of the titania phases (anatase: brookite: rutile - 2 : 2 : 1). Synergistic effect between crystallinity, phase ratio, morphology of oxide material, band gap and photocatalytic activity in the anatase/brookite nanocomposites was established.
机译：通过经典的水解方法制造锐钛矿/布鲁克钛矿纳米复合材料，另外使用用四丁基二丁酯的预成型二氧化钛溶胶的水热处理。水热处理TiO2合成缓冲溶液对X射线衍射，低温氮吸附和UV-Vis光谱研究的平均粒径，比表面积，孔隙尺寸分布，光催化性能，光催化性能。已经确定预制备的二氧化钛溶胶作为水解产物的水热处理导致金红石的形成，在400℃下退火后。提出了形成锐钛矿/布鲁克钛矿/金红石纳米复合材料的各种模型。观察到TiO 2的爆炸间隙能量的变化，并通过变化相组合物和纳米复合粒子的颗粒尺寸的效果解释。分析了使用二氧化钛纳米复合材料的亚甲基蓝（MB）光氧化反应。为具有二氧化钛相（Anatase：Broughite：Brookite：金红石 - 2：2：1）的材料检测MB氧化的最大光催化活性。建立了结晶度，相比，氧化物材料的形态，氧化钛矿纳米复合材料中的氧化物材料，带隙和光催化活性的协同作用。

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