高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (3): 497.

• 研究论文 • 上一篇    下一篇

四硼酸根阴离子对氯型水滑石前体插层组装的动力学研究

苟国敬1,2, 马培华1, 褚敏雄1   

  1. 1. 中国科学院青海盐湖研究所,西宁 810008;
    2. 中国科学院研究生院,北京 100039
  • 收稿日期:2004-04-26 出版日期:2005-03-10 发布日期:2005-03-10
  • 通讯作者: 苟国敬(1964年出生),男,博士,副教授,从事无机合成与制备化学研究.E-mail:ggj64@yahoo.com.cn E-mail:ggj64@yahoo.com.cn
  • 基金资助:

    国家重点科技攻关“十五”计划(批准号:2001BA602B-03)资助.

Dynamics of Intercalation of B4O5(OH)42- Anion into Layered Double Hydroxides Intercalated by Cl- Anion

GOU Guo-Jing1,2, MA Pei-Hua1, CHU Min-Xiong1   

  1. 1. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810003, China;
    2. Graduate School, Chinese Academy of Sciences, Beijing 100039, China
  • Received:2004-04-26 Online:2005-03-10 Published:2005-03-10

摘要: 根据四硼酸根对氯型水滑石(LDH-Cl)前体插层组装时溶液浓度的变化和不同反应进程产物的EDS,IR,XRD,TEM和TG-DTA表征研究了四硼酸根插层组装的动力学.结果表明,氯离子的交换溶出符合Stumm模型,四硼酸根的插入受控于扩散过程模型;插层产物保留了前驱体的层状结构及微孔结构,但插入大体积复杂离子B4O5(OH)2-4引起晶胞c轴向体积和粒子尺寸的变化较大,晶胞参数c由2.399nm增大到2.558nm,通道高度h由0.3228nm增大到0.3756nm,粒子面向直径Da由15.16nm减小到8.92nm,径向尺寸Dc由10.93nm减小到4.55nm;比表面积由92.63m2/g增大到111.20m2/g;LDH热分解特征亦有较大变化.

关键词: 前驱体LDH-Cl, 离子交换, 插层组装, 反应进程

Abstract: The dynamics feature of intercalation and assembly of B4O5(OH)2-4 into layered double hydroxides intercalated by Cl-was investigated in this paper, based on the result of monitoring for viriation of solution concentration during the reaction course, and the results of EDS, IR, XRD, TEM and TG-DTA characterization for the samples produced from different reaction course. The results testified that the displacement of Cl-accorded with Stumm's kinetics pattern, the intercalation of B4O5(OH)2-4 was controlled by diffusion course pattern. The investigation proved that the brucite layer structure and micropore structure feature of the precursor remained intact after ionic exchange, but the intercalation of bulky complicated B4O5(OH)2-4 resulted in volume expansion of unit cell in c axial, increasing of micropore specific surface area, decreasing of grain size, and varying of thermodynamic action. The lattice parameter c aggrandized from 2.399 nm to 2.558 nm, the gallery height h aggrandized from 0.322 8 nm to 0.375 6 nm, with grain size decreasing of Da from 15.16 nm to 8.92 nm, Dc from 10.93 nm to 4.55 nm, while specific surface area increased from 92.63 m2/g to 111.20 m2/g, and the thermodynamic action and TG-DTA characteristic was altered.

Key words: Precursor LDH-Cl, Ionic exchange, Intercalation and assembly, Reaction course

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