Abstract

$ZrO_2$ Powder was Prepared by sol-gel process and the adsorption characteristic of cobalt($Co^{2+}$) by $ZrO_2$ adsorbent in high-temperature water was investigated using batch adsorption experiment with a stirred autoclave. The prepared $ZrO_2$ was calcined at $600{\sim}1400^{\circ}C$ and analyzed by X-ray diffractometry, SEM, BET surface area, FT-IR and TG-DTA measurement. The tetragonal Phase of $ZrO_2$ is produced $480^{\circ}C$ from amorphous gel at temperature $480^{\circ}C$. Both tetragonal and monoclinic phase of $ZrO_2$ exist at temperature between $600^{\circ}C$ and $1000^{\circ}C$. At temperature $1200^{\circ}C$, tetragonal to monoclinic phase trasition is occurred. The $Co^{2+}$ adsorption capacity of $ZrO_2$ calcined at $600^{\circ}C$ for 4 hours is 0.16 meq $Co^{2+}/g$ adsorbent in the high temperature at $250^{\circ}C$. The adsorption of $Co^{2+}$ on the $ZrO_2$ adsorbent is irreversible endothermic in the temperature range ($125-175^{\circ}C$). The standard enthalpy change (${\Delta}H^{\circ}$) of $ZrO_2$ calcined at $600^{\circ}C$ for 4 hours is 18 kJ/gmol.

Keywords

File

Download PDF

References

1. Inorganic Ion Exchangers C. B. Amphlett
2. J. Colloid Interface Sci. v.52 P. H. Twari;W. Lee
3. Proceedings of symposium on oxide-electrolyte interfaces;J. Electronchem. Soc. Specific Adsorption Co(II) by ZrO₂ and Fe₃O₄ P. H. Tewari;R. H. Tuxworth;W. Lee
4. Nucl. Tech. v.65 F. Kawamura;K. Funabashi;M. Kikuchi;K. Ohsumi
5. J. apple Chem. Biotechnol v.23 B. E. Yoldas
6. J. Inorg. Nucl. Chem. v.43 K. Fujita;H. Yamashita;S. Takeuchi;F. Nakajima
7. J. Mater. Sci. v.25 A. Benedetti(et al.)
8. J. Am. Ceram. Sci. v.73 S. D. Ramamurthi (et al.)
9. J. Mater. Sci. v.21 B. E. Yoldas
10. J. Am. Ceram. Soc. v.55 R. C. Garvie;P. S. Nicholson
11. Sience and Technology of Zirconia v.3 Effect of Inclusion Size on the Retention of Tetragonal ZrO₂: Theory and Experiments F. F. Lange;D. J. Green
12. Ion Exchange F. Helfferich
13. AICHE Symposium Series v.71 P. H. Tewari;N. S. McIntyre