Hydrous Titanium Dioxide로부터 H+/Na+의 이온교환에 의한 티탄산나트륨의 합성 및 상전이

이진식; 송연호; 이철태

Journal of the Korean Industrial and Engineering Chemistry, Vol.9, No.4, 585-590, August, 1998

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Hydrous Titanium Dioxide로부터 H+/Na+의 이온교환에 의한 티탄산나트륨의 합성 및 상전이

The Synthesis of Sodium Titanate by the Ion Exchange of H⁺/Na⁺ from Hydrous Titanium Dioxide and its Phase Ttansition

이진식, 송연호, 이철태

초록

섬유상의 Na_xTi_nO_2n+1는 층상구조의 H₂Ti₄O₉·_nH₂O 에대한 H⁺/Na⁺의 이온교환에 의해서 합성되었다. 이온교환 반응은 0.5-2.0 M NaOH 용액에서 이루어졌으며, 2.0 M NaOH의 용액에서 이온 교환할 때 73%가 치환되었다. 이 때 길이가 10∼20㎛이고 직경이 약 0.7㎛인 비교적 균일한 형태의 섬유상을 얻을 수 있었다. 그리고 층상구조의 티탄산나트륨에 대한 상전이는 열분석을 통해 확인하였으며, 이 결과 Na_xTi_nO_2n+1 섬유는 200∼600℃의 온도에서 Na₂Ti_{6_{O₁₃과 TiO₂로 분해되었다.}}

Fibrous Na_xTi_nO_2n+1 whisker was prepared by H⁺Na⁺ ion-exchange on layered hydrous titanium dioxide (H₂Ti₄O₉·nH₂O). The ion-exchange reaction was proceeded at 0.5∼2.0 M NaOH solution. In the ion-exchange at 2.0 M NaOH solution, 73% of sodium was exchanged and the prepared Na_xTi_nO_2n+1 whisker was a fibrous crystal of about 10∼20㎛ of length and about 0.7㎛ of diameter. The phase transition of the ion-exchange phases identified by the themal analysis. The result showed that the Na_xTi_nO_2n+1 whisker was decomposed into Na₂Ti₆O₁₃ and TiO₂ in the temperature of 200∼600 ℃.

Keywords:Sodium Titanate Whisker;Ion Exchange Reaction;Phase Transition

[References]

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[1] Lee CT, Kim SW, Lee JS, Kim YM, Kwon KT, J. Korean Ind. Eng. Chem., 5(3), 478 (1994)

[2] Lee CT, Lee JS, Lee SM, Park YS, J. Korean Ind. Eng. Chem., 6(6), 997 (1995)

[3] Lee CT, Lee JS, Kim HJ, J. Korean Ind. Eng. Chem., 7(3), 580 (1996)

[4] Kwon KT, Lee JS, Oh CH, Lee CT, J. Korean Ind. Eng. Chem., 8(3), 410 (1997)

[5] Lee CT, Lee JS, Ko DW, Kim HJ, J. Korean Ind. Eng. Chem., 8(3), 446 (1997)

[6] Sasaki T, Watanabe Y, Fujiki Y, Bull. Chem. Soc. Jpn., 58, 3500 (1985)

[7] Kikkaw S, Yasuda F, Koizumi M, Mater. Res. Bull., 20, 1221 (1985)

[8] Izawa H, Kikkawa S, Koizumi M, Polyhedron, 2, 741 (1983)

[9] Sasaki T, Komatsu Y, Fujiki Y, Inorg. Chem., 28, 2776 (1989)

[10] Heltterich F, "Ion Exchange," McGraw-Hill Corp., New York (1962)

[11] Nyquist RA, Kagel RO, "Infrared Spectra of Inorganic Compounds," Academic Press, Inc. (1995)