Carbon coating of anatase-type TiO2 through their precipitation in PVA aqueous solution
Carbon coating of anatase-type TiO2 through their precipitation in PVA aqueous solution
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DOI：
10.1016/s0008-6223(03)00340-3
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发表时间：
2003-01-01
期刊：
影响因子：
10.9
通讯作者：
Toyoda, M
中科院分区：
文献类型：
--
作者：
Inagaki, M;Hirose, Y;Toyoda, M
通过水解四异丙醇钛制备的光催化锐钛矿型TiO 2的细颗粒通过在聚乙烯醇（PVA）水溶液中沉淀而被碳包覆，随后在400-1000 ℃的高温下在高纯度Ar流中热处理。在没有碳涂层的情况下，从金红石到金红石的相变在600 ℃以上开始，但在有碳涂层的情况下，它被抑制到800 ℃。相变的抑制取决于碳涂层的量，当碳含量高于5质量%时观察到明显的抑制。通过改变溶液中PVA的浓度来控制碳包覆在涂层上的量。为了具有约5质量%的碳含量，必须使用大于2质量%的PVA溶液。(C)2003爱思唯尔有限公司。保留所有权利。
Fine particles of photocatalytic anatase-type TiO2 prepared through hydrolysis of titanium-tetraisopropoxide were coated by carbon through their precipitation in poly(vinyl alcohol) (PVA) aqueous solution, followed by heat treatment at high temperatures of 400-1000 degreesC in a flow of high purity Ar. Without carbon coating, the phase transformation from anatase to rutile started above 600 degreesC, but it was suppressed up to 800 degreesC with carbon coating. Suppression of the phase transformation depended on the amount of carbon coated, apparent suppression being observed with carbon content above 5 mass%. The amount of carbon coated on anatase was controlled by changing the concentration of PVA in the solution. In order to have a carbon content of about 5 mass%, a PVA solution with more than 2 mass% had to be used. (C) 2003 Elsevier Ltd. All rights reserved.