Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Synthesis of Titanium Dioxides by Microemulsion Method and Their Photocatalytic Degradation of p-Nitrophenol

마이크로에멀젼법에 의한 이산화티탄의 합성 및 p-Nitrophenol의 광촉매 분해반응

  • Jung, Won Young (Division of Applied Chemical Engineering, Pukyong National University) ;
  • Han, Yeon Hee (Division of Applied Chemical Engineering, Pukyong National University) ;
  • Lee, Gun-Dae (Division of Applied Chemical Engineering, Pukyong National University) ;
  • Park, Seong Soo (Division of Applied Chemical Engineering, Pukyong National University) ;
  • Hong, Seong-Soo (Division of Applied Chemical Engineering, Pukyong National University)
  • 정원영 (부경대학교 응용화학공학부) ;
  • 한연희 (부경대학교 응용화학공학부) ;
  • 이근대 (부경대학교 응용화학공학부) ;
  • 박성수 (부경대학교 응용화학공학부) ;
  • 홍성수 (부경대학교 응용화학공학부)
  • Received : 2008.05.02
  • Accepted : 2008.05.19
  • Published : 2008.06.10
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Abstract

Titania nanoparticles were prepared by controlled hydrolysis of titanium tetraisopropoxide (TTIP) in water-in-oil (W/O) and microemulsion stabilized with a nonionic surfactant, N P-10 (Polyoxyethylene Nonylphenol Ether: $C_9H_{19}C_6H_4(OCH_2CH_2)_{10}OH$)). The nanosized particles prepared in W/O microemulsion were characterized by FT-IR, TEM, XRD, TGA, and DTA. In addition, the photocatalytic degradation of p-nitrophenol has been studied by using a batch reactor in the presence of UV light in order to compare the photocatalytic activity of prepared nanosized titania. The nanaosized titania particles calcined at $300{\sim}600^{\circ}C$ showed an anatase structure, but it transformed to a rutile phase above $700^{\circ}C$ of calacination temperature. With an increase of $W_o$ ratio, the crystallite size increased but photocalytic activity decreased. The titania synthesized at $W_o=5$, R = 2, and calcined at $400{\sim}500^{\circ}C$ showed the highest activity on the photocatalytic degradation of p-nitrophenol.

비이온성의 N P-10 (Polyoxyethylene Nonylphenol Ether: $C_9H_{19}C_6H_4(OCH_2CH_2)_{10}OH$) 계면활성제를 사용하여 나노크기의 $TiO_2$를 제조하였으며, TGA-DTA TEM, XRD, FT-IR 등을 사용하여 마이크로에멀젼을 이용한 나노입자 제조시 $W_o$ ($H_2O/AOT$)비에 따른 입자의 크기 및 결정성 등 물리적 성질을 조사하였다. 또한 제조된 $TiO_2$ 나노입자의 광촉매적 특성을 알아보기 위해 회분식 반응장치를 이용하여 p-nitrophenol의 광분해반응의 활성을 조사하였다. 제조된 $TiO_2$ 나노입자는 $300{\sim}600^{\circ}C$의 소성온도 범위에서 anatase 구조가 형성되었으며, 소성온도 $700^{\circ}C$에서 anatase 구조에서 rutile 구조로 전이되기 시작하였다. 입자크기는 $W_o$ 비가 증가함에 따라 증가하였고, 반면에 p-nitrophenol의 광분해반응에서 반응성은 감소하였다. 또한 $400{\sim}500^{\circ}C$에서 소성된 $TiO_2$ 촉매가 순수한 anatase 구조를 가지며 가장 높은 p-nitrophenol 분해활성을 보여주었다.

Keywords

Acknowledgement

Supported by : 산업자원부

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