Effect of Alumina on the Ion-Exchange Capacity of Porous Glasses

다공질유리의 이온교환성에 미치는 알루미나의 영향

  • 김병호 (고려대학교 재료공학과) ;
  • 이덕열 (고려대학교 재료공학과) ;
  • 김성길 (고려대학교 재료공학과)
  • Published : 1988.03.01

Abstract

Ion-exchange porous glasses were prepared by heat treatment and subsequently hydro thermalor acid leaching treatment $10Li_2O$.$(90-x)B_2O_3$.$xSiO_2$ base glasses containing various amount of $Al_2O_3$ or $MoO_3$. It was investigated how the phase separation and the cation exchange capacity(CEC) were affected by the addition of $Al_2O_3$ or $MoO_3$. The optimum condition of phase separation in these glasses was about 48$0^{\circ}C$ for 10 hrs. The degree of phase separation was rapidly suppressed by the addition of $Al_2O_3$ up to 10 mol% and thereafter suppression effect was decreased. The maximum value of CEC, about 252meq/100g, was observed with the $1OLi_2O$.$45B_2O_3$.$45SiO_2+7.5Al_2O_3$ porous glass prepared by hydrothermal treatment and its mean pore radius was about 16.3A. The addition of $MoO_3$ accelerated phase separation and leaching rate. Looking at the remakable increment of pore diameter and pore volume of these porous glasses by the addition of $MoO_3$, the effect of $MoO_3$ may be ascribed to the lowering of silica concentration in the borate phase and to the forming of water-soluble complex with silica during the leaching treatment.

Keywords

References

  1. U.S. Pat. 2,286,275 Method of Treating Borosilicate Glasses H.P. Hood;M.E. Nordberg
  2. J. Am. Ceram. Soc. v.27 Properties of Some Vycor-Brand Glasses H.P. Hood;M.E. Nordberg
  3. Silikat Tech. v.9 no.2 Phase Separation and Boron Anomaly in Simple Sodium Borate and Technical Alkali-Borosilicate Glasses W. Skatulla;W. Vogel;H. Wessel
  4. J. Am. Chem. Soc. v.65 no.7 The Low Temperature Adsorption of Nitrogen, Oxygen, Argon, Hydrogen, n-Butane and Carbon Dioxide on Porous Glass and on Partially Dehydrated Chabazite P.H. Emmett;T. Dewitt
  5. The Sci. and Tech. of Korea Univ. v.23 A Study on the Manufacturing of Ion-Exchange Porous Glasses B.H. Kim;M.J. Park;J.S. Park
  6. J. Kor. Ceram. Soc. v.21 no.1 Ion Exchange Capacity and Phase Separation of Alkali Borosilicate Glass by Substituting Al₂O₃ B.H. Kim;Y.M. Yu
  7. Yogyo-Kyokai-Shi v.92 no.9 Effects of Sample Size and Concentration of Leaching Acid on Formation of Colloidal Silica in Porous Glass T. Yazawa;K. Eguchi;T. Yamaguro
  8. J. Am. Ceram. Soc. v.61 Structural Anisotropt and Birefringence in Microporous Glasses T. Takamori
  9. The Chemistry of Silica R.H. Her
  10. J. Chem. Phys. v.46 no.6 Experimental Evidence for Spinodal Decomposition in Glasses of the Na₂O-SiO₂System J.J. Hammel
  11. KSL 2303
  12. Soil Sci. v.59 Determination of Exchange Capacity and Exchangeable Basis in Soil Ammonium Acetate Method C.J. Schollenberger;R.H. Simmon
  13. J. Am. Chem. Soc. v.66 The Adsorption of Gases in Multimolecular Layers S. Brunauer;P.H. Emmett;E. Teller
  14. Catalysis v.Ⅱ Reaction Rates and Selectivity in Catalyst Pores A. Wheeler;P.H. Emmett(ed.)
  15. Adsorption, Surface Area and Porosity S.J. Greg;K.S.W. Sing
  16. Advances in Catalysis and Related Subjects v.9 The Determination of Pore Structures from Nitrogen Adsoption Isotherms R.W. Cranston;F.A. Inkley;A. Farkas(ed.)
  17. J. Non-Cryst. Solids. v.31 The Leaching of Phase-Separated Sodium Borosilicate Glass A. Makishima;J.D. Mackenzie;J.J. Hammel
  18. Yogyo-Kyokai-Shi v.93 no.3 Effect of Molybdenum Oxide on Pore Characteristics of Porous Glass H. Tanaka;T. Yazawa;K. Eguchi
  19. 본학회지 v.21 no.63 다공질유리의 이온교환능과 미세구조 김병호