中华医学超声杂志

应用化学 ›› 1998, Vol. 0 ›› Issue (3): 103-105.

• 研究论文 • 上一篇    下一篇

偏钛酸型锂离子交换剂固相合成反应动力学

钟辉1, 郭灵虹2   

  1. 1. 成都理工学院应用化学系 成都610059;
    2. 四川联合大学分析测试中心 成都
  • 收稿日期:1997-08-25 修回日期:1997-12-10 出版日期:1998-06-10 发布日期:1998-06-10
  • 基金资助:
    四川省应用基础研究基金

Synthetic Kinetics of Solid State Reaction of H2TiO2 Type Ion exchangers

Zhong Hui1, Guo Linghong2   

  1. 1. Department of Applied Chemistry, Chengdu Institute of Technology, Chengdu 610059;
    2. The Center of Test and Analysis, Sichuan Union University, Chengdu
  • Received:1997-08-25 Revised:1997-12-10 Published:1998-06-10 Online:1998-06-10

PDF

455

被引次数

17 | 5

摘要： 用Li2CO3和TiO2为原料,通过高温焙烧合成Li2T iO3,经酸换型后形成对Li+具有特殊记忆功能的无机离子交换剂,为从低浓度Li+的海水和盐湖水中直接提锂提供了有效方法[1]. Li2TiO3型锂离子交换剂的合成-结构-性能之间有强烈的相关性,在固相合成反应中,通过热力学重结晶(焙烧),使Li+渗入到TiO2八面体结构中,从而形成只能容纳Li+的特殊“孔穴”,使之对Li+具有特殊的记忆功能.因此,合理的焙烧过程是人工合成这类无机离子记忆材料的关键[2].Li2TiO3固相合成反应动力学的研究,为确立合理的焙烧制度和其结构变化提供依据.但有关方面研究,至今尚未见报道.

关键词: 偏钛酸锂, 离子交换剂, 合成, 固相反应动力学

Abstract: The solid-state reaction mechanism between Li2CO3 and TiO2 forming Li2TiO3 has been studied by XRD. The relationship between reaction rate and temperature and the dependence of the reactant fraction (a) on the heating time were investigated. The activation energy of the reaction has been calculated to be 166.2 kJ/mol. The reaction mechanism conformed to the Ginstling-Brounstein model. It is proposed that Li+ ions diffuse into TiO2 particles during the reaction.

Key words: metatitanate lithium, ion exchanger, synthesis, solid state reaction kinetics

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