Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (06): 867-872.doi: 10.1016/S1872-1508(07)60049-7

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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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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