페복제 적하법에 의한 나노 결정 TiO 2 피복 석탄회의 제조와 광촉매 특성

유연태; 최영윤; 김병규; Yeon-tae Yu; Young-yoon Choi; Byoung-gyu Kim

Korean Journal of Materials Research, Vol.12, No.5, 334-340, May, 2002

DOI10.3740/MRSK.2002.12.5.334 Export Citation

페복제 적하법에 의한 나노 결정 TiO 2 피복 석탄회의 제조와 광촉매 특성

Preparation of Nanocrystalline TiO 2 Coated Coal Fly Ash by Dropping Method of Coating Agent and Photocatalytic Characterization

유연태^†, 최영윤, 김병규

한국지질자원연구원 자원활용연구부

Yeon-tae Yu^†, Young-yoon Choi, and Byoung-gyu Kim

Mineral & Materials Processing Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Korea

E-mail:

TiO 2 -coated fly ash was synthesized by dropping method of coating agent in order to get TiO 2 coating layer with high photocatalytic activity on the surface of coal fly ash. The properties of the TiO 2 coating layer such as morphology, crystal structure, crystal size and photocatalytic activity were compared with those of the TiO 2 -coated fly ash prepared by the traditional method of precipitation. TiCl 4 aqueous solution was used as a titanium stock solution and NH 4 HCO 3 was used as a precipitant. The TiO 2 coating layer obtained by dropping method of coating agent was more uniform than that coated by precipitation. However, the crystal of TiO 2 coated by dropping method of coating agent was easy to grow by heat treatment because of the small primary particle size and bulky morphology, and its photocatalytic activity was consequently lower than that of the TiO 2 coated by precipitation. The TiO 2 coating layer obtained by both methods had a crystal structure of anatase, and the temperature of phase transformation into rutile was 90 0 ? C . The minimum crystal size of TiO 2 for the highest photocatalytic activity was found to be about 10nm.

Keywords:photocatalyst;titania;coal fly ash

[References]

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[1] Tanaka K, Capule MFV, Hisanaga T, Chemistry Letters, 187(1-2), 73 (1991)

[2] Torimoto T, Okawa Y, Takeda N, Yoneyama H, Journal of Photochemistry and Photobiology A ; Chemistry, 103, 153 (1997)

[3] Matsubara H, Takada M, Koyama S, Hashimoto K, Fujishima A, Chem. Lett.(767) (1995)

[4] Beydoun D, Amal R, Low GKC, McEvoy S, J. Phys. Chem. B, 104(18), 4387 (2000)

[5] Pozzo RL, Baltanas MA, Cassano AE, Catal. Today, 39(3), 219 (1997)

[6] Sampath S, Uchida H, Yoneyama H, J. Catal., 149(1), 189 (1994)

[7] Hsien YH, Chang CF, Chen YH, Cheng SF, Appl. Catal. B: Environ., 31(4), 241 (2001)

[8] Yamashita H, Honda M, Ichihashi Y, Anpo M, Hirao T, Itoh N, J. Phys. Chem. B, 102(52), 10707 (2000)

[9] Yu YT, Choi YY, Kim BG, Lee HJ, Korean J. Mater. Res., 11(8), 690 (2001)

[10] Nakamura H, Chen Y, Kimura K, Takeyama H, Hirosue H, J. Ceram. Soc. Jpn., 105(11), 1037 (1997)

[11] Zaitsev VS, Filimonov DS, Presnyakov IA, Gambino RJ, Chu B, J. Colloid Interface Sci., 212(1), 49 (1999)

[12] Langford JA, Wilson AJC, J. Appl. Cryst., 11, 102 (1978)

[13] Edelson LH, Glaeser AM, J. Am. Ceram. Soc., 71(4), 225 (1988)

[14] Anpo M, Shima T, Kodama S, Kubokawa Y, J. Phys. Chem., 91, 4305 (1987)

[15] Harada H, Ueda T, Chem. Phys. Lett,, 106, 229 (1984)

[16] Cao LX, Gao Z, Suib SL, Obee TN, Hay SO, Freihaut JD, J. Catal., 196(2), 253 (2000)

[17] Sopyan I, Watanabe M, Murasawa S, Hashimoto K, Fujishima A, Chem. Lett., 69 (1996)

[18] Kominami H, Kato J, Kohmo M, Kera Y, Ohtani B, Chem. Lett., 1051 (1996)

[19] Banfield JF, Bischoff BL, Anderson MA, Chem. Geol., 110, 211 (1993)