Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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Characteristics of Al-Pillared Clay Synthesized from Bentonite and the Adsorption Properties for Phosphate Ion

벤토나이트로부터 합성한 Al-층간가교점토의 특성과 인산이온의 흡착성

  • Published : 2002.12.01
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Abstract

Al-pillared clay was synthesized by constructing pillars of aluminum oxides at the interlayer of montmorillonite in bentonite. XRD, DTA and chemical analyses of Al-pillared clay were performed to examine mineralogical properties. Batch adsorption experiments were also conducted to determine the adsorption properties of this synthesized clay for phosphate ions. XRD analyses showed that the interlayer space of Al-pillared clay expanded to 18.03 $\AA$ at room temperature and shifted to $17 \AA$ after heating to $550^{\circ}C$. A small change in interlayer space after heating indicates high thermal stability. The interlayer expansion by glycerol was also very small. From DTA analyses, pillared clay showed the characteristic endothermic peaks at 270 and $420^{\circ}C$ , which might be caused by dehydration in framework of pillars between interlayers. Adsorption experiment revealed that Al-pillared clay had an excellent adsorption capacity to the phosphate ions, whereas montmorillonite had very low adsorption capacity to phosphate ions. In phosphate solution concentration up to 300 mg/L, 2 g of pillared clay could uptake almost 100% of phosphate ions from 20 mL of solution. After heat treatment of the phosphate adsorbed pillared clay at 50$0^{\circ}C$ to remove phosphate, the calcined pillared clay could adsorb phosphate ions with a little decreased adsorption efficiency. This fact indicates that Al-pillared clay can be recycled for the adsorption of phosphate ions.

벤토나이트에 포함된 몬모릴로나이트의 층간에 Al산화물의 기둥(pillar)을 만든 Al-층간가교 점토를 합성하였다. 이 Al-층간가교점토에 대해 XRD, DTA, 화학분석 등을 실시하여 광물학적 특성을 검토하였으며, 그리고 이 가교점토에 대하여 Batch법의 흡착실험을 통하여 인산이온의 흡착성을 검토하였다. X-선 회절분석의 결과, Al-층간가교점토는 상온에서 층간격이 $18.03 \AA$으로 증가되어 나타났고, $550\AA$가열에서도 약 $17\AA$을 나타내어 열적 안정성이 크며, 글리세롤에 의한 층간격의 팽윤은 매우 미약한 것으로 나타났다. 열분석 결과, 이 점토에는 pillar부분에 관련된 물의 탈수에 의한 것으로 보이는 $270^{\circ}C$와 $420^{\circ}C$의 특징적인 흡열반응이 나타났다. Al-층간가교 점토의 인산 이온에 대한 흡착실험의 결과, 몬모릴로나이트는 거의 흡착능력을 보이지 않는데 비하여 월등히 우수한 인산이온($PO_{4}^{3－}$ /)성을 나타냈다. 시료 2 g에 용액 20 mL의 실험에서 300 mg/L 이하의 인산 농도에서는 거의 100%의 흡착효율을 나타냈다. 그리고 인산 이온에 흡착된 시료를 $500^{\circ}C$로 가열한 후 재차 흡착실험을 행한 결과, 역시 매우 높은 흡착효율을 나타냈다. 따라서 Al-층간가교 점토의 인산 이온 흡착에 대한 재활용의 가능성이 큰 것으로 나타났다

Keywords

References

  1. Andres, A.M., Merino, J., Calvan, J.C., and Ruiz-Hitzky, E. (1999) Synthesis of pillared clays assisted by microwaves, Mater ial Research Bulletin. 34, 641-651. https://doi.org/10.1016/S0025-5408(99)00053-7
  2. Bahranowski, M., Gasior , M., Kielski, A., Podobinski, J., Serwicka, E.M. Vartikian , L.A., and Wodnicka, K. (1999) Copper-doped alumina-pillared montmorillonites as catalysts for oxidation of toluene and xylenes with hydrogen peroxide. Clay Minera ls, 43, 1, 79-87.
  3. Bergaya, F. and Barrault , J. (1990) Mixed AI-Fe pillared laponites : Preparation, characterization and their catalytic properties in syngas conversion. in Pillared Layer ed Structures: Current Trends and Applications, Mitchell, I. V. edt ., London and New York, Elsevier Applied Science, 167- 184.
  4. Chrom, M. and Rengasamy , P. (1996) Effect of heat ing on swelling and dispersion of different cat ionic form s of a smectite. Clays and Clay Miner., 44, p. 784-789.
  5. Galvan, J.C., Jimenez-Morales, A., Jimenez, R.,Merino, J., Villanueva, A., Crespin, M., Crespin, M., Aranda, P., and Ruiz-Hitzky , E. (1998) Application of the electrochemical impedance technique to study of pillared clays. Chern . Mater., 10,3385-3381.
  6. Gonzalez , F., Pesquera, C., Benito, I., Hereo , E., Poncio, C., and Casuscelli, S. (1999) Pillared clay: catalytic evaluation in oil cracking using a microactivity test. Applied Catalysis A : General, 181, 72. https://doi.org/10.1016/S0926-860X(98)00391-3
  7. Gutierrez, E. and Ruiz-Hitzky, E. (1990) Molecular rearrangement react ions on pillared clays. Pillared Layered Structure: Current Trend s and Applications , Mitchell, IV. edt ., London and New York,Elsevier Applied Science, 199-201.
  8. Long, R.Q., Chang, M.T., and Yang, R.T. (2001)Enhancement of activities by sulfation on Fe-exchanged, TiO$^2$-pillared clay for selective catalytic reduction of NO by ammonia. Applied Catalysis B: Environmental. 33. 97-107.
  9. Macs, N., Hcy1cn, I., Cool, P., and Vansant (1997) The relation between the synthesis or pillared clays and their resulting porosity. Applied Clay Science. 12, 43-60.
  10. Occelli, M.L., AuRoux, A., and Ray, G.T. (2000) Physicochemical characterization of a Taxas montmorillonitc pillared with polyoxocations or alluminum. II NMR and microcalorirnctry results,Microporous and Mcsoporous Material, 39, 43-56.
  11. Ogawa, M. (2000) Recent progress on the applications of organically modified smectites. Jour. Clay Sci. Soc. Japan, 39, 4, 207-220.
  12. Olphcna, H.V. and Fripiat, J.J. (1979) Data handbook for clay minerals and other non-metallic minerals. Pergamon Press.
  13. Ooka, C, Osaki, T., Horio, M.. and Suzuki. K.(1997) Adsorption of molecules with different shapes on alumina-pillared montmorillonite with different amount or pillar. Jour. Clay Sci. Soc.Japan, 36, 4, 175-179.
  14. Palink6, I., Lazar, K., and Kiricsi, I. (1997) Cationic mixed pillared layered clays : infrared and Mo ssbauer characteristics of the pillaring agents and pillared structures in Fe, Al and Cr, Al pillared montmorillonites. Jour. Molecular Structure.411.p.547-550.
  15. Pires, J,. Brotas, C.M., and Carvalho, A.P. (1997)Aluminum-pillared clays : dcpcomposition of the intercalating species and textual properties. Zcolitc, 19. 107-113.
  16. Schoonheydt, R.A., Leeman, H., Scorpion, A, Lenotte,I., and Grobet, P. (1994) The pillaring of clay, Part IIIl. Clays and Clay Miner., 42, 518-525.
  17. Sou Kou, M.R., Mcndioroz, S., and Guijarro, M.I.(1998) A thermal study or Zr-pillarcd montmorillonitc.Thcrmochimica Acta, 323, 145-157.
  18. Tichit, D. and Figueras, F. (1990) Preparation and modification of the thermal stabilities of Al, Zr and Si pillared smectites. Pillared Layered Structurcs: Current Trends and Applications, Mitchell. I.V. edt., London and New York, Elsevier Applied Science, 149-158.
  19. Vieira C.A. and Poncelet, G. (1990) Preparation,characterization and some catalytic properties of different smectites pillared with hydroxy-gallium solutions, Pillared layered structures: current trends and applications, Mitchell, I. V. edt., London and New York, Elsevier Applied Science, 185-193.