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无机材料学报

• 研究论文 • 上一篇    

阴离子粘土LiAl2(OH)6X·2H2O(X=OH-,1/2CO32-)的离子交换特性

温兆银; 林祖纕; 江东亮   

  1. 中国科学院上海硅酸盐研究所; 上海200050
  • 收稿日期:1997-08-14 修回日期:1997-09-09 出版日期:1998-08-10 网络出版日期:1998-08-10

Ion Exchange Property of Anionic Clays LiAl2(OH)6X·2H2O(X=OH-,1/2CO32-)

WEN Zhao-Yin; LIN Zu-Xiang; JIANG Dong-Liang   

  1. Shanghai Institute of Ceramics; Chinese Academy of Sciences Shanghai 200050 China
  • Received:1997-08-14 Revised:1997-09-09 Published:1998-08-10 Online:1998-08-10

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摘要： 本文研究了阴离子粘土LiAl2（OH）6X·2H2O（X＝OH-，1／2CO2-3）的离子交换特性．结构分析表明，LiAl2-LDH含水分隔层内的OH-和CO2-3离子容易与酸性溶液中的Cl-、NO-3等离子进行交换，且保持LIAL2-LDH的水滑石型层状结构不变，其中Cl-离子表现出较高的离子交换速率．在阴离子交换的同时，氢氧化物层内的Li＋离子也被H＋离子部分取代，但交换率较低．进一步的讨论说明，虽然LiAl2-LDH具有层状基体结构特征，但其离子传导的各向异性较弱．

关键词: 阴离子粘土, 层状双氢氧化物, 离子交换, 离子传导

Abstract: This paper described the ion exchange phenomena in the layered double hydroxide compounds LiAl2(OH)6 X·2H2O where X=OH- or 1/2CO32-. The
hydrotalcite-type structure of LiAl2-LDH was remained after the anionic exchange between X- and Cl- or NO3-. Simultaneous cation exchange
was also indicated by both a strong lattice OH infrared vibration at about 940cm-1 and the intensity decrease of the Li-O vibration. It was shown that the anion
exchange rate was much higher than the cation exchange rate, moreover, anionic exchange with Cl- was much easier than with NO3-, implying a larger
transfer coefficient of Cl- ion in the conductive interlayer of hydrotalcite structure.

Key words: anionic clays, layered double hydroxide, ion exchange, ionic conduction

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