Synthesis of visible-light-active nanosize rutile titania photocatalyst by low temperature dissolution-reprecipitation process
Synthesis of visible-light-active nanosize rutile titania photocatalyst by low temperature dissolution-reprecipitation process
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DOI：
10.1016/s1010-6030(03)00289-2
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发表时间：
2004-04-15
影响因子：
4.3
通讯作者：
Sato, T
中科院分区：
文献类型：
--
作者：
Yin, S;Hasegawa, H;Sato, T
采用低温溶解-再沉淀工艺（LTDRP）在液体介质中制备了二氧化钛纳米晶体。非晶前驱体的结晶可以在室温左右的低温下进行，远低于传统的煅烧和水热反应。热力学稳定的金红石在低于70℃的低温下形成，而亚稳锐钛矿在较高温度下形成。钛的相组成、显微组织、形貌和比表面积随再析出温度的变化而发生显著变化。制备了具有高比表面积的针状金红石型二氧化钛和球形锐钛型二氧化钛晶体。在波长>400和/或>510 nm的可见光照射下，结晶良好的针状纳米金红石晶体比锐钛矿晶体具有更高的光催化活性。(C) 2004 Elsevier B.V.版权所有
Titania nanocrystals were prepared by a "low temperature dissolution-reprecipitation process" (LTDRP) in liquid media. The crystallization of amorphous precursor could proceed at low temperature around room temperature, which was much lower than those of conventional calcination and hydrothermal reactions. The thermodynamically stable rutile formed at low temperature below 70degreesC, while the metastable anatase formed at higher temperature. The phase composition, microstructure, morphology, and specific surface area of titania changed significantly depending on the reprecipitation temperatures. Needle-like rutile titania and spherical anatase titania crystals with high specific surface areas were prepared. Well-crystallized needle-like nanosize rutile crystals possessed higher photocatalytic activities than those of anatase crystals under visible light irradiation of wavelength >400 and/or >510 nm. (C) 2004 Elsevier B.V. All rights reserved.