摘要:
以低浓度工业钛液为原料,通过自生晶种热水解硫酸法工艺制备偏钛酸,研究了水解过程中偏钛酸结构的变化,并采用粒度测试、XRD、BET及Raman对所制偏钛酸样品进行表征。结果表明:水解前期,偏钛酸粒子的D50和DAV几近相同,随粒子生长、团聚,粒子变大、分布变宽。偏钛酸中锐钛相TiO2结构由晶核决定,后续水解对锐钛相结构无明显影响。偏钛酸为TiO2短链结构,具有较多中孔,孔隙结构不规整。随水解时间的增加,晶胞参数c增大,锐钛型TiO2结构有向斜方晶畸变趋势。偏钛酸Raman峰强度增加,特征峰位对应波数减小,导致TiO2含量增加,晶化程度升高。
Abstract:
Using low concentration industrial titanyl sulfate solution as raw material,metatitanic acid was prepared via the self seeded thermal hydrolysis sulfate process.The structural changes of metatitanic acid during hydrolysis of industrial titanyl sulfate solution were investigated.The as-prepared samples were characterized by particle size distribution test,XRD,BET and Raman.The results show that the D50 and DAV of the metatitanic acid particles were almost the same at the early stage of hydrolysis.The metatitanic acid particles became larger and distributed wider with the crystal growth and agglomeration,and.The TiO2 structure of anatase phase in meta titanic acid was determined by the crystal nucleus,and subsequent hydrolysis has no obvious effect on the structure of anatase phase.The metatitanic acid was TiO2 short chain structure with many mesopores and irregular pore structure.The cell parameter c increases with the increase of hydrolysis time,and the anatase TiO2 structure had trend of distorted to the syncline square crystal.The intensity of Raman peak increases and the corresponding wavenumber of characteristic peak decreases,which results in the increase of the content of TiO2 and the increase of the degree of crystallization.
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