수식 졸-겔법에 의한 TiO<sub>2</sub>-SiO<sub>2</sub>분체합성 및 광촉매활성

김병관; Mizuno N; Yasui I

Journal of the Korean Industrial and Engineering Chemistry, Vol.7, No.6, 1034-1042, December, 1996

Export Citation

수식 졸-겔법에 의한 TiO₂-SiO₂분체합성 및 광촉매활성

Preparation of TiO₂-SiO₂ Powder by Modified Sol-Gel Method and their Photocatalytic Activities

김병관, Mizuno N, Yasui I

초록

DCCA로 1-도데카놀을 이용한 수식 졸-겔법에 의한 TiO₂-SiO₂계분체를 합성하였으며, 이들 합성분체에 대한 characterization과 광활성촉매에 대해 검토하였다. 500℃까지의 감량변화는 TiO₂단독분체가 33.0wt%, TiO₂/SiO₂의 몰 비가 75/25, 50/50 및 25/75인 분체는 각각 67.0wt%, 70.0wt% 및 73.0wt%, 그리고 SiO₂단독분체는 42.5wt%이였다. 이들 탈리는 거의 대부분이 유기물질이였다. 합성직후의 분체는 TiO₂단독분체를 제외하고는 무정형화합물이였고, 아나타아제의 루틸로의 상전이는 SiO₂에 의해 억제되었다. 합성직후의 분체는 입자의 형태가 관찰되지 않았으나, 600℃, 1시간 가열에 의한 TiO₂단독분체, TiO₂/SiO₂의 몰비가 75/25 및 50/50인 분체는 모두 서브미크론의 입자를 보였으며, 몰비가 25/75의 분체 및 SiO₂단독분체는 여전히 벌크상태였다. 비표면적 역시 SiO₂의 증가와 함께 증가하였으며, 세공크기 역시 SiO₂성분에 의존하였다. 그리고 이들 가열물의 광촉매활성은, TiO₂/SiO₂의 몰비가 75/25인 분체의 경우, 수소발생량으로 0.240 μmol/h.g-cat.을 나타내었으며, TiO₂단독분체의 그것보다는 약 2.6배, 표준광촉매물질인 P-25(Degussa P-25)보다는 약 2.0배 가량 큰 값을 나타냈다.

Various TiO₂-SiO₂ composite powders were prepared by the modified sol-gel method using 1-dodecanol as DCCA (Dryng Control Chemical Additive ). Their characterizations were carried out and their photocatalytic catalysis was examined on the evolution reaction of hydrogen. The weight losses at 500℃ of only TiO₂ and SiO₂ powders were 33. 0wt% and 42.5wt%, respectively, and those of the TiO₂/SiO₂ powders (TiO₂/SiO₂= 25/75, 50/50 and 75/25) were about 70.0 ± 3.0wt%. The released substances from the powders were almost organic matters. The as-prepared powders except only TiO₂ powder were amorphous. Transformation of anatase to rutil was hindered by SiO₂ component and the crystallinity of anatase was decreased with increasing SiO₂ contents. The as-prepared powders were bulky states. By heating at 600℃ for 1 hr TiO₂-SiO₂ powders (TiO₂=100%, TiO₂/SiO₂= 75/25, 50/50) showed agglomerates consisted of particles in submicron, but those of TiO₂/SiO₂= 25/75 and SiO₂= 100% were still bulky states. Specific surface area of the powders heat-treated at 600℃ for 1hr was increased with SiO₂ concents and their pore sizes were also depended on SiO₂ contents. The photocatalytic activity of TiO₂/SiO₂ = 75/25 heat-treated at 600℃ for 1hr was 0.240mo1/h.g-cat as H₂ evolution rate. This value was about 2.0 times that of P-25(Degussa P-25) as a standard photocatalyst.

[References]

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Nelson RL, Ramsay JDF, Woodhead JL, Cairns JA, Crassley JAA, Thin Solid Films, 81, 329 (1981)
Partlow DP, O'Keeffe TW, Appl. Opt., 29, 1526 (1990)
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[Referenced By]

[1] Kim BK, Kim JH, J. Korean Ind. Eng. Chem., 6(6), 1077 (1995)

[2] 양종규, 김종향, 김병관, 대한환경공학회지, 17, 1279 (1995)

[3] Low GKC, McEvoy SR, Mathews RW, Environ. Sci. Technol., 25, 460 (1991)

[4] Pelzzetti E, Maurino V, Minero C, Zerbinati O, Borgarello E, Chemosphere, 18, 1437 (1989)

[5] Pichat P, Oliverira JCD, Maffre JF, Mas D, "The First International Conference on TiO₂ Photocatalytic Purification and Treatment of Water and Air," (1992)

[6] Pelizzetti E, Carlin C, Minero C, Tratzel M, New J. Chem., 15, 351 (1991)

[7] Pelizzetti E, Borgarello M, Minero C, Pramauro E, Borgarello E, Serpone N, Chemosphere, 17, 499 (1988)

[8] Kudo A, Tanaka A, Domen K, Maruya K, Aika K, Onishi T, J. Catal., 102, 92 (1988)

[9] Kawai T, Sakada T, J. Chem. Soc.-Chem. Commun., 694 (1980)

[10] Kawai T, Sakada T, Nature, 286, 474 (1980)

[11] Borgarello E, Kiwi J, Pelizzetti E, Gratzel M, J. Am. Chem. Soc., 103, 6324 (1981)

[12] Moser J, Gratzel M, J. Am. Chem. Soc., 105, 6547 (1981)

[13] Orcel G, Hench LL, Artaki I, Jonas J, Zerda TW, J. Non-Cryst. Solids, 105, 223 (1988)

[14] Boonstra AH, Bernards TNM, Smits JJT, J. Non-Cryst. Solids, 109, 141 (1989)

[15] Adachi T, Sakka S, J. Non-Cryst. Solids, 99, 118 (1988)

[16] Yoldas BE, Am. Ceram. Soc. Bull., 54, 286 (1975)

[17] VanderWoude JHA, DeBruyn PO, Colloids Surf., 12, 79 (1984)

[18] Nelson RL, Ramsay JDF, Woodhead JL, Cairns JA, Crassley JAA, Thin Solid Films, 81, 329 (1981)

[19] Partlow DP, O'Keeffe TW, Appl. Opt., 29, 1526 (1990)

[20] Floch HG, Priotton JJ, Thomas IM, Thin Solid Films, 175, 173 (1989)

[21] Yoldas BE, Appl. Opt., 19, 1425 (1980)