کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6589667 | 456847 | 2015 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Mechanism and kinetics of titanium hydrolysis in concentrated titanyl sulfate solution based on infrared and Raman spectra
ترجمه فارسی عنوان
مکانیسم و سینتیک هیدرولیز تیتانیوم در محلول تیتانیل سولفات متمرکز بر روی طیف های مادون قرمز و رامان
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
The titanium hydrolysis in the concentrated titanyl sulfate solution is essential to the TiO2 production by using the new NaOH roasting method proposed by authors, which is undergoing to scale up. The experimental titanium hydrolysis was detected by the infrared and Raman spectra for the first time to reveal the significant role of SO42â ions. The bridging bidentate SO42â ligands arrange the Ti-O octahedra of hydrated titanium dioxide (HTD) in zigzag chains along the crystal face (221) to form anatase structure and are changed into unidentate SO42â ligands and free bisulfate ions step by step with increasing hydrolysis time. This proposed mechanism of titanium hydrolysis in titanyl sulfate solution was applied to establish a new kinetic model x=1âkneâkn(12kmCTi0+t)2kmCTi0[Ei(knt+kn2kmCTi0)âEi(kn2kmCTi0)]âeâknt, which indicates the important effect of initial concentrations of titanium, sulfuric acid, and water on the titanium hydrolysis. The hydrolysis kinetic model is capable of describing the behavior of the system and can provide basic knowledge for scale-up of TiO2 production.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Science - Volume 134, 29 September 2015, Pages 196-204
Journal: Chemical Engineering Science - Volume 134, 29 September 2015, Pages 196-204
نویسندگان
Weijing Wang, Yahui Liu, Tianyan Xue, Jie Li, Desheng Chen, Tao Qi,