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Chinese Science Bulletin

, Volume 46, Issue 13, pp 1112–1115 | Cite as

1H MAS NMR spectra of hydroxyl species on diatomite surface

  • Yuan Peng
  • Wu Daqing
  • Chen Zhong
  • Chen Zhiwei
  • Lin Zhongyu
  • Diao Guiyi
  • Peng Jinlian
Notes

Abstract

High spinning speed1H magic-angle spinning nuclear magnetic resonance (1H MAS NMR) was used to detect surface hydroxyl groups of diatomite, which include isolated hydroxyl groups and hydrogen-bonded hydroxyl groups, and water adsorbed on diatomite surface that include pore water and hydrogen-bonded water. The corresponding proton chemical shifts of above species are ca. 2.0, 6.0–7.1, 4.9 and 3.0 respectively. Accompanied by thermal treatment temperature ascending, the pore water and hydrogen-bonded water are desorbed successively. As a result, the relative intensities of the peaks assigned to protons of isolated hydroxyl groups and hydrogen-bonded hydroxyl groups increase gradually and reach their maxima at 1000°C. After 1100°C calcination, the hydroxyl groups that classified to strongly hydrogen-bonded ones and the isolated hydroxyl groups condense basically. But some weakly hydrogen-bonded hydroxyl groups may still persist in the micropores.

Keywords

diatomite surface hydroxyl groups 1H MAS NMR thermal treatment 

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References

  1. 1.
    Yuan, P., Wu, D. Q., Present situation in applications of diatomite in fields of some products with high additional value and related fundamental research, Journal of Mineral and Petrology (in Chinese), 2000, 20(1): 101.Google Scholar
  2. 2.
    Calacal, E. L., Whittemore, O. J., The sintering of diatomite, American Ceramic Society Bulletin, 1987(2): 1.Google Scholar
  3. 3.
    Wang, F. Y., Zhang H. F., Feng, H. et al., A mineralogical study of diatomite in Leizhou Peninsula, Chinese Journal of Geochemistry, 1995, 14(2): 140.CrossRefGoogle Scholar
  4. 4.
    Feng, H., Zhang, H. F., Guo, J, G. et al.,29Si MAS NMR spectroscopic study of diatomite, Acta Mineralogica Sinca (in Chinese), 1999, 19(2): 210.Google Scholar
  5. 5.
    Yang, Y. X., Wang, J. X., Yang, Z. et al., A study on the mechanism of the adsorption of urokinase on the local diatomite, Acta Chimica Sinica (in Chinese), 1994, 52: 670.Google Scholar
  6. 6.
    Chen, R. S., Yang, Y. X., Hou, Q. T., Progress of study on local diatomites and their new application, Chemical Industry Times (in Chinese), 1997, 11(5): 54.Google Scholar
  7. 7.
    Wang, X. Q., Gao, S., Yu, L. X. et al., Synthesis of porphyrin nanometer material by a new method, Journal of Chinese Universities (in Chinese), 1998, 19(6): 854.Google Scholar
  8. 8.
    Wu, D. Q., Diao, G. Y., Wei, J. F. et al., Surface function groups and surface reactions of minerals, Geological Journal of China Universities (in Chinese), 2000, 6(2): 225.Google Scholar
  9. 9.
    Yuan, P., Wu, D. Q., Ling, Z. Y. et al., Study on surface hydroxyl species on diatomite using drift spectroscopy, Spectroscopy and Spectral Analysis (in Chinese) (in press).Google Scholar
  10. 10.
    Morrow, B. A., Mcfarian, A. J., Surface vibrational modes of hydroxyl groups on silica, Journal of American Chemical Society, 1992, 96: 1395.Google Scholar
  11. 11.
    Koretsky, C. W., Sverjensky, D. A., Salisbury, J. W. et al., Detection of surface hydroxyl species on quartz, γ-alumina, and feldspars using diffuse reflectance infrared spectroscopy, Geochimi. Cosmochim. Acta, 1997, 61: 2193.CrossRefGoogle Scholar
  12. 12.
    Bronnimann, C. E., Zeigler, R. C., Maciel, G. E., Proton NMR study of dehydration of the silica gel surface, Journal of American Chemical Society, 1988, 110(7): 2023.CrossRefGoogle Scholar
  13. 13.
    Liu, C. C., Maciel, G. E., The fumed silica surface: a study by NMR, Journal of American Chemical Society, 1996, 118: 5103.CrossRefGoogle Scholar
  14. 14.
    Bogdan, A., Kulmala, M., Gorbunov, B. et al., NMR study of phase transitions in pure water and binary H2O/HNO3 films adsorbed on surface of pyrogenic silica, Journal of Colloid and Interface Science, 1996, 177: 79.PubMedCrossRefGoogle Scholar
  15. 15.
    Caillerie, J. B., Aimeur, M. R., Kortobi, Y. E., Water adsorption on pyrogenic silica followed by1H MAS NMR, Journal of Colloid and Interface Science, 1997, 194:434.CrossRefGoogle Scholar
  16. 16.
    Hamdan, H., Muhid, M., Endud, S. et al.,29Si MAS NMR, XRD and FESEM studies of rice husk silica for the synthesis of zeolites, Journal of Non-crystalline Solids, 1997, 211: 126.CrossRefGoogle Scholar
  17. 17.
    Li, X. A., Feng, H., Zhang H. F. et al., NMR study of water in diatomite, Acta Mineralogica Sinica (in Chinese), 1999, 19(2): 154.Google Scholar

Copyright information

© Science in China Press 2001

Authors and Affiliations

  • Yuan Peng
    • 1
    • 2
  • Wu Daqing
    • 1
  • Chen Zhong
    • 3
  • Chen Zhiwei
    • 3
  • Lin Zhongyu
    • 3
  • Diao Guiyi
    • 1
  • Peng Jinlian
    • 1
  1. 1.Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhouChina
  2. 2.State Key Laboratory for Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical EngineeringXiamen UniversityXiamenChina
  3. 3.College of Chemistry and Chemical EngineeringXiamen UniversityXiamenChina

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