Thermodynamic modeling and experimental verification for ion-exchange synthesis of K2O•6TiO2 and TiO2 fibers from K2O•4TiO2

被引:43
作者
Bao, NZ [1 ]
Lu, XH [1 ]
Ji, XY [1 ]
Feng, X [1 ]
Xie, JW [1 ]
机构
[1] Nanjing Univ Chem Technol, Nanjing 210009, Peoples R China
基金
中国国家自然科学基金;
关键词
ion-exchange; solid-fluid (potassium titania fiber-aqueous solution) equilibria; model; potassium titanate; titanium dioxide; fiber;
D O I
10.1016/S0378-3812(01)00733-6
中图分类号
O414.1 [热力学];
学科分类号
摘要
A thermodynamic model was established to determine ion-exchange conditions for the synthesis of potassium hexatitanate (K(2)O(.)6TiO(2)) and titanium dioxide (TiO2) from potassium tetratitanate (K(2)O(.)4TiO(2)) fiber. In the proposed model equilibrium species in the solid phase and corresponding ion-exchange equilibrium constants at 298.15 K were determined from the experimental data of Sasaki et al. [Inorg. Chem. 24 (1985) 2265]. In order to verify the proposed model, prediction results were compared with experimental data determined in literature and those measured in this work. The comparison shows a good agreement. Based on this, the proposed model was also used to predict more extensive suitable conditions for the synthesis of K(2)O(.)6TiO(2) and TiO2. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:229 / 243
页数:15
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