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Received April 16, 2013
Accepted June 15, 2013
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나노크기 TiO2의 제조에 미치는 첨가제 영향
The Effect of Additives on the Preparation of Nanosized TiO2 Particles
부경대학교 화학공학과, 608-739 부산시 남구 용당동 산 100 1부경대학교 기계시스템공학과, 608-739 부산시 남구 용당동 산 100 2부산가톨릭대학교 환경행정학과, 609-757 부산시 금정구 부곡3동 9
Department of Chemical Engineering, Pukyoung National University, San 100 Yongdang-dong, Nam-gu, Busan 608-739, Korea 1Department of Mechanical System Engineering, Pukyoung National University, San 100 Yongdang-dong, Nam-gu, Busan 608-739, Korea 2Department of Environmental Administration, Catholic University of Busan, 9 Boogok-3dong, Geumjeong-gu, Busan 609-757, Korea
csju@pknu.ac.kr
Korean Chemical Engineering Research, August 2013, 51(4), 426-431(6), 10.9713/kcer.2013.51.4.426 Epub 23 July 2013
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Abstract
비교적 낮은 온도와 상압에서 전구체 Titanium(IV) sulfate와 염기성 용액을 반응시키는 수열합성법을 이용하여 소성과정을 거치지 않고 TiO2 나노입자를 제조하였다. 염기성 용액의 종류(NaOH, NH4OH, Monoethanolamine, Diethanolamine, Triethanolamine), 첨가되는 계면활성제의 종류(CTAB, Span 20, SDBS)와 농도, 제조 온도, pH 등을 변화시켜 TiO2를 제조하였고, 생성되는 입자의 결정성, 입자크기 등과 같은 물리적 특성은 XRD, SEM, Zeta-potential 등을 사용하여 분석하였다. 또한, 광촉매적 특성을 확인하기 위하여 DRS를 통해 흡광면적을 측정, 비교하였다. 침전제로 사용된 염기성 물질 중 NaOH가 결정성이 우수하고 입자크기가 작은 TiO2를 제조하는데 가장 효과적임을 확인할 수 있었다. 계면활성제는 양이온성 계면활성제인 CTAB를 첨가한 경우 다른 계면활성제보다 작은 크기의 TiO2를 제조할 수 있었다. 그리고 동일한 조건에서 전구체인 Ti(SO4)2와 CTAB의 농도비를 10 : 1로 조절한 경우 CTAB를 첨가하지 않은 경우보다 제조되는 TiO2 입자의 크기는 약 1/10인 5.8 nm로 감소하였다.
Nanosized TiO2 particles were prepared from titanium (IV) sulfate solution using base solutions at low reaction temperature (95 ℃) and atmospheric pressure by hydrothermal precipitation method without calcination. The effects of preparation conditions, such as kind of base solutions (NaOH, NH4OH, Monoethanolamine, Diethanolamine, Triethanolamine) and surfactants (CTAB, Span 20, SDBS), concentration of surfactants, temperature and pH, on the physical properties of TiO2 particles have been investigated by XRD, SEM and Zeta-potential meter. Absorption area_x000D_
was also investigated by DRS in order to confirm the photocatalytic activity of the nanosized TiO2 particles. It was turned out that, among base solutions, NaOH provides the smallest TiO2 particles with excellent crystallinity. And cationic surfactant (CTAB) prepared smaller TiO2 particles than any other surfactants. When CTAB is added in the concentration ratio of Ti(SO4)2:CTAB=10:1, TiO2 particles with particle diameter of 5.8 nm were prepared. This is approximately 1/10 of that prepared without CTAB.
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