고온수중에서 ZrO2의 코발트흡착 특성에 대한 연구

김유환; 배성렬

Journal of the Korean Industrial and Engineering Chemistry, Vol.8, No.2, 267-275, April, 1997

Export Citation

고온수중에서 ZrO2의 코발트흡착 특성에 대한 연구

A Study on the Adsorption Characteristic of Cobalt on ZrO₂ in High-Temperature Water

김유환, 배성렬

초록

본 연구는 졸-겔법을 이용하여 제조한 ZrO₂의 하소 온도에 따른 분말특성을 조사하고, 고온수에서 ZrO₂의 Co²⁺ 흡착특성을 교반기가 달린 압력용기를 이용한 회분식 흡착 실험으로 알아보았다. 졸-겔법을 이용하여 ZrO₂ 분말을 제조하고, 600℃∼1400℃로 하소한 후, X-선 회절법, SEM, BET 방법, Fourier transform 적외선 (FT-IR), 열중량 및 열시차분석법(TG-DTA)등을 이용하여 특성 변화를 조사하였다. 비정질의 질코니아는 480℃부터 tetragonal 질코니아가 생성되고 600℃∼1000℃ 온도범위에서는 tetragonal 질코니아와 monoclinic 질코니아가 공존하며, 1200℃에서는 tetragonal 질코니아에서 monoclinic 질코니아로의 상변태가 나타났으며, 고온수에서 하소온도가 600℃인 ZrO₂의 흡착제의 코발트 평형흡착용량은 0.16 meq/9 이었다. 125℃ 이상의 고온에서의 흡착반응은 비가역 흡열반응이며, 600℃에서 하소한 ZrO₂의 표준엔탈피 변화값(△H^○)은 약 18 kJ/gmol 이였다.

ZrO₂ Powder was Prepared by sol-gel process and the adsorption characteristic of cobalt(Co²⁺) by ZrO₂ adsorbent in high-temperature water was investigated using batch adsorption experiment with a stirred autoclave. The prepared ZrO₂ was calcined at 600℃∼1400℃ and analyzed by X-ray diffractometry, SEM, BET surface area, FT-IR and TG-DTA measurement. The tetragonal Phase of ZrO₂ is produced 480℃ from amorphous gel at temperature 480℃. Both tetragonal and monoclinic phase of ZrO₂ exist at temperature between 600℃ and 1000℃. At temperature 1200℃, tetragonal to monoclinic phase trasition is occurred. The Co²⁺ adsorption capacity of ZrO₂ calcined at 600℃ for 4 hours is 0.16 meq Co²⁺/g adsorbent in the high temperature at 250℃. The adsorption of Co²⁺ on the ZrO₂ adsorbent is irreversible endothermic in the temperature range (125-175℃). The standard enthalpy change (△H^○) of ZrO₂ calcined at 600℃ for 4 hours is 18 kJ/gmol.

[References]

Amphlett CB, "Inorganic Ion Exchangers," Elsevier Publishing, Co., Amsterdam (1964)
Tewari PH, Lee W, J. Colloid Interface Sci., 52, 77 (1975)
Tewari PH, Tuxworth RH, Lee W, "Specific Adsorption Co(Ⅱ) by ZrO₂ and Fe₃O₄," Proceedings of Symposium on Oxide-Electrolyte Interfaces. J. Electrochem. Soc. (1973)
Kawamura F, Funabashi K, Kikuchi M, Ohsumi K, Nucl. Tech., 65, 332 (1984)
Yoldas BE, J. Appl. Chem. Biotechnol., 23, 803 (1973)
Fujita K, Yamashita H, Takeuchi S, Nakajima F, J. Inorg. Nucl. Chem., 43, 188 (1980)
Benedetti A, J. Mater. Sci., 25, 1473 (1990)
Ramamurthi SD, J. Am. Ceram. Soc., 73, 2760 (1990)
Yoldas BE, J. Mater. Sci., 21, 1080 (1986)
Garvie RC, Nicholson PS, J. Am. Ceram. Soc., 55, 303 (1972)
Lange FF, Green DJ, "Effect of Inclusion Size on the Retention of Tetragonal ZrO₂: Theory and Experiments," 3, "Science and Technology of Zirconia," The Am. Ceram. Soc. Inc., 217 (1981)
Helfferich F, "Ion Exchange," McGraw-Hill, New York (1962)
Tewari PH, McIntyre NS, AIChE Symp. Ser., 71, 134 (1975)

[Referenced By]

[1] Amphlett CB, "Inorganic Ion Exchangers," Elsevier Publishing, Co., Amsterdam (1964)

[2] Tewari PH, Lee W, J. Colloid Interface Sci., 52, 77 (1975)

[3] Tewari PH, Tuxworth RH, Lee W, "Specific Adsorption Co(Ⅱ) by ZrO₂ and Fe₃O₄," Proceedings of Symposium on Oxide-Electrolyte Interfaces. J. Electrochem. Soc. (1973)

[4] Kawamura F, Funabashi K, Kikuchi M, Ohsumi K, Nucl. Tech., 65, 332 (1984)

[5] Yoldas BE, J. Appl. Chem. Biotechnol., 23, 803 (1973)

[6] Fujita K, Yamashita H, Takeuchi S, Nakajima F, J. Inorg. Nucl. Chem., 43, 188 (1980)

[7] Benedetti A, J. Mater. Sci., 25, 1473 (1990)

[8] Ramamurthi SD, J. Am. Ceram. Soc., 73, 2760 (1990)

[9] Yoldas BE, J. Mater. Sci., 21, 1080 (1986)

[10] Garvie RC, Nicholson PS, J. Am. Ceram. Soc., 55, 303 (1972)

[11] Lange FF, Green DJ, "Effect of Inclusion Size on the Retention of Tetragonal ZrO₂: Theory and Experiments," 3, "Science and Technology of Zirconia," The Am. Ceram. Soc. Inc., 217 (1981)

[12] Helfferich F, "Ion Exchange," McGraw-Hill, New York (1962)

[13] Tewari PH, McIntyre NS, AIChE Symp. Ser., 71, 134 (1975)