pH Effect on Titania-Phase Transformation of Precipitates from Titanium Tetrachloride Solutions
pH Effect on Titania-Phase Transformation of Precipitates from Titanium Tetrachloride Solutions
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DOI：
10.1111/j.1151-2916.2002.tb00467.x
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发表时间：
2002-09
影响因子：
3.9
通讯作者：
Jing Sun;Lian Gao
中科院分区：
文献类型：
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作者：
Jing Sun;Lian Gao
以TiCl4溶液为原料，在室温和70℃的条件下，用水解法制备了不同结构的TiCl4沉淀物，考察了pH值对二氧化钛相变的影响。在pH值为4时，加入NH4OH，四氯化钛的原始沉淀形成凝胶状结构，在600℃时可转变为基本上100%的金红石相；在70℃时，金红石沉淀在pH为0.50时可转变为混合相产物，在pH为3.13和5.15时可转变为全锐钛矿相。在700℃时，三种样品都发生了从锐钛矿到金红石的完全相变。
Precipitates in different structures were prepared by the hydrolysis of a TiCl4 solution at room temperature and 70°C. The pH effect on titania-phase transformation was investigated. The original precipitate formed by the hydrolysis of titanium tetrachloride formed a gel-like structure at pH 4 with the addition of NH4OH, which could be changed to essentially 100% rutile phase at 600°C. The rutile precipitates prepared at 70°C could be changed to mixed-phase product at pH 0.50 and total anatase phase at pH 3.13 and 5.15. Complete phase transformation from anatase to rutile occurred in the three samples at 700°C.