物理化学学报 >> 2007, Vol. 23 >> Issue (06): 867-872.doi: 10.1016/S1872-1508(07)60049-7

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多核固体NMR研究层状二硅酸钠SKS-6的钙离子脱除过程

文晓艳; 邓风   

  1. 中国科学院武汉物理与数学研究所, 波谱与原子分子物理国家重点实验室, 武汉 430071; 武汉理工大学, 光纤传感技术与信息处理教育部重点实验室, 武汉 430070
  • 收稿日期:2006-12-12 修回日期:2007-02-06 发布日期:2007-06-04
  • 通讯作者: 文晓艳 E-mail:wen_xiaoyan@126.com

Multinuclear Solid-state NMR Study on the CalciumIons Extracting Process of Layered Sodium Disilicate SKS-6

WEN Xiao-Yan; DENG Feng   

  1. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China; Key Laboratory of Fiber Optic Sensing Technology and Information Processing, Ministry of Education, Wuhan University of Technology, Wuhan 430070, P. R. China
  • Received:2006-12-12 Revised:2007-02-06 Published:2007-06-04
  • Contact: WEN Xiao-Yan E-mail:wen_xiaoyan@126.com

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摘要： 利用1H、29Si、23Na多核固体核磁共振(NMR)以及X射线衍射技术研究了层状二硅酸钠SKS-6与同一浓度氯化钙溶液反应不同时间的产物, 探讨了SKS-6的钙离子脱除过程. 实验揭示出SKS-6是通过钙离子与钠离子之间的快速置换来脱除钙离子, 钙离子快速取代钠离子与SKS-6中的硅氧四面体结合, 使得硅氧四面体层发生扭曲, 骨架有序度降低, 但是原有的层状结构仍然保持. 延长反应时间对该过程没有明显的促进作用, 说明钙离子对钠离子的取代在很短的时间(1 min)内就已经完成. 延长反应时间只是促进了SKS-6中桥式和非桥式氧原子的水解, 并使得产物中kanemite相的钠离子与水分子的配合发生变化.

关键词: 层状二硅酸钠, 离子脱除过程, NMR

Abstract: The reactions of layered sodium disilicate SKS-6 and calcium chloride solution with invariant concentration reacted for different reaction times were studied using solid-state 1H, 29Si, and 23Na nuclear magnetic resonance (NMR) spectroscopy as well as X-ray powder diffraction technique. On the basis of the experimental results the calcium ions extracting process of SKS-6 was shown to be rapid ions substitution of sodium ions by calcium ions. After substitution, calcium ions combined with the SiO4 tetrahedrons in SKS-6, and the ordering of the silicate layer was decreased to a certain extent, with the survival of original layered structure. Ion substitution rapidly proceeded and almost was completed within 1 min because prolonging the reaction time introduced no obvious variation in it. Prolonging the reaction time just prompted the hydrolysis of bridging as well as nonbridging oxygen atoms in SKS-6, and simultaneously changed the chemical circumstance of sodiumions in the newly formed kanemite phase.

Key words: Layered sodiumdisilicate, Ion extracting process, NMR