Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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The Effect of Additives on the Preparation of Nanosized TiO2 Particles

나노크기 TiO2의 제조에 미치는 첨가제 영향

  • Kim, Seok-Hyeon (Department of Chemical Engineering, Pukyoung National University) ;
  • Na, Seok-En (Department of Chemical Engineering, Pukyoung National University) ;
  • Kim, Si-Young (Department of Mechanical System Engineering, Pukyoung National University) ;
  • Kim, Seong-Soo (Department of Environmental Administration, Catholic University of Busan) ;
  • Ju, Chang-Sik (Department of Chemical Engineering, Pukyoung National University)
  • 김석현 (부경대학교 화학공학과) ;
  • 나석은 (부경대학교 화학공학과) ;
  • 김시영 (부경대학교 기계시스템공학과) ;
  • 김성수 (부산 가톨릭대학교 환경행정학과) ;
  • 주창식 (부경대학교 화학공학과)
  • Received : 2013.04.16
  • Accepted : 2013.06.15
  • Published : 2013.08.01
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Abstract

Nanosized $TiO_2$ particles were prepared from titanium (IV) sulfate solution using base solutions at low reaction temperature ($95^{\circ}C$) and atmospheric pressure by hydrothermal precipitation method without calcination. The effects of preparation conditions, such as kind of base solutions (NaOH, $NH_4OH$, Monoethanolamine, Diethanolamine, Triethanolamine) and surfactants (CTAB, Span 20, SDBS), concentration of surfactants, temperature and pH, on the physical properties of $TiO_2$ particles have been investigated by XRD, SEM and Zeta-potential meter. Absorption area was also investigated by DRS in order to confirm the photocatalytic activity of the nanosized $TiO_2$ particles. It was turned out that, among base solutions, NaOH provides the smallest $TiO_2$ particles with excellent crystallinity. And cationic surfactant (CTAB) prepared smaller $TiO_2$ particles than any other surfactants. When CTAB is added in the concentration ratio of $Ti(SO_4)_2$:CTAB=10:1, $TiO_2$ particles with particle diameter of 5.8 nm were prepared. This is approximately 1/10 of that prepared without CTAB.

비교적 낮은 온도와 상압에서 전구체 Titanium(IV) sulfate와 염기성 용액을 반응시키는 수열합성법을 이용하여 소성과정을 거치지 않고 $TiO_2$ 나노입자를 제조하였다. 염기성 용액의 종류(NaOH, $NH_4OH$, Monoethanolamine, Diethanolamine, Triethanolamine), 첨가되는 계면활성제의 종류(CTAB, Span 20, SDBS)와 농도, 제조 온도, pH 등을 변화시켜 $TiO_2$를 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 $TiO_2$를 제조하는데 가장 효과적임을 확인할 수 있었다. 계면활성제는 양이온성 계면활성제인 CTAB를 첨가한 경우 다른 계면활성제보다 작은 크기의 $TiO_2$를 제조할 수 있었다. 그리고 동일한 조건에서 전구체인 $Ti(SO_4)_2$와 CTAB의 농도비를 10 : 1로 조절한 경우 CTAB를 첨가하지 않은 경우보다 제조되는 $TiO_2$ 입자의 크기는 약 1/10인 5.8 nm로 감소하였다.

Keywords

References

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