Direct formation of new, phase-stable, and photoactive anatase-type Ti1−2XNbXScXO2 solid solution nanoparticles by hydrothermal method
Direct formation of new, phase-stable, and photoactive anatase-type Ti1−2XNbXScXO2 solid solution nanoparticles by hydrothermal method
复制标题
DOI：
10.1016/j.materresbull.2007.08.027
复制
发表时间：
2008-08
影响因子：
5.4
通讯作者：
M. Hirano;T. Ito
中科院分区：
文献类型：
--
作者：
M. Hirano;T. Ito
在温和的水热条件下，在180 ° C下，使用尿素水解，由TiOSO4，NbCl5和Sc（NO3）3的前体溶液直接形成新的光活性Ti1 - 2XNbXScXO2（X = 0 - 0.2）固溶体的纳米颗粒。随着铌和钪含量从X = 0增加到0.2，晶体的晶格常数a0和c0、晶粒尺寸和光学带隙逐渐增大。通过测定溶液中亚甲基蓝（MB）的浓度，分别评价了它们的光催化活性和吸附性能。锐钛矿型Ti1 − 2XNbXScXO2（X = 0.05）的光催化活性分别是水热锐钛矿型纯TiO 2和市售参比纯TiO 2（ST-01）的约2倍和3倍。Ti1 − 2XNbXScXO2（X = 0 - 0.2）的α相在空气中热处理时可稳定存在至900 ° C。通过相变形成了新的金红石型Ti1 − 2XNbXScXO2固溶体。Ti1 - 2XNbXScXO2（X = 0 - 0.2）固溶体锐钛矿-金红石相转变的起始温度推迟，完成温度加快。
A new anatase phase of photoactive Ti1−2XNbXScXO2(X=0–0.2) solid solutions was directly formed as nanoparticles from precursor solutions of TiOSO4, NbCl5, and Sc(NO3)3under mild hydrothermal conditions at 180°C for 5h using the hydrolysis of urea. With the increase of the content of niobium and scandium from X=0 to 0.2, the lattice parameters a0and c0, the crystallite size, and the optical band gap of anatase gradually increased. Their photocatalytic activity and adsorptivity were evaluated separately by the measurement of the concentration of methylene blue (MB) remained in the solution in the dark or under UV-light irradiation. The anatase-type Ti1−2XNbXScXO2(X=0.05) showed approximately two times and three times as high photocatalytic activity as those of the hydrothermal anatase-type pure TiO2and commercially available reference pure TiO2(ST-01), respectively. The anatase phase of Ti1−2XNbXScXO2(X=0–0.2) existed stably up to 900°C during heat treatment in air. New rutile-type Ti1−2XNbXScXO2solid solutions are formed through the phase transformation. The starting temperature of anatase-to-rutile phase transformation for Ti1−2XNbXScXO2(X=0–0.2) solid solutions was delayed but its completing temperature was accelerated.