离子交换法可控合成四钛酸钾衍生物  

Controllable synthesis of the derivatives of K_2Ti_4O_9 fibers by ion-exchange method

作　　者：何明[1] 冯新[1] 陆小华[1] 吉晓燕[1] 暴宁钟[1] 谢敬伟[1] 

机构地区：[1]南京工业大学化学化工学院,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2003年第2期27-31,共5页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家杰出青年科学基金(29925616);国家自然科学基金(20246002);江苏省科委应用基础研究基金(BJ98060);江苏省科技厅社会发展基金(BS2000013)

摘　　要：利用四钛酸钾(K2Ti4O9)离子交换平衡热力学模型预测了获得K2Ti4O9纯相衍生物的最优条件,并以K2Ti4O9晶须为前驱体,以目标产物的固相Ti与K摩尔比为控制目标,通过调节离子交换过程中溶液平衡pH值和用K+选择性电极控制液相K+浓度,成功合成出纯相的水合四钛酸H2Ti4O9·1 2H2O、TiO2晶须、K2Ti8O17晶须、K2Ti6O13晶须,用实验验证了预测的准确性。同时实验结果表明,只要控制了离子交换中间产物的固相化学组成,就可以控制最后产物的形式,初步探索了反应过程中组成和结构的关系。An ionexchange thermodynamic model was used to predict the optimal hydrate conditions for the synthesis of derivatives of potassium tetratitanate fiber(K2Ti4O9),including H2Ti4O9·12 H2O,TiO2 fiber,K2Ti8O17 fiber and K2Ti6O13 fiber. A novel viewpoint is proposed that Ti/K mole ratio of the final products in solid phase is taken as the controlling aim in the hydration process. The composition of intermediate solid products can be actually synthesized by controlling pH value of solution in ionexchange process and potassium ion concentration with ion selective electrodes (ISEs). After heat treatment of intermediates,the phasepure products were obtained and verified by xray diffraction analysis. These results showed that final products are determined by the composition of the hydrate intermediates and the prediction from the thermodynamic model is reliable.

关 键 词：四钛酸钾 衍生物 离子交换 水合 热力学平衡模型 

分 类 号：O643[理学—物理化学]