Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Synthesis and Photocatalytic Activity of Ag Spot-coated TiO2-SrO Composite Powders

나노 Ag spot-coated TiO2-SrO 복합분체의 합성과 광촉매 활성 평가

  • Han, Jae-Kil (Department of Surface & Nano Technology, Songdo Techno Park) ;
  • Kim, Hyeong-Chul (Department of Computer Aided Mechanical Design, Incheon City College) ;
  • Hong, Won-Seok (Environmental System Center, Korea Institute of Machinery and Materials) ;
  • Choi, Sung-Chang (Department of Surface & Nano Technology, Songdo Techno Park)
  • 한재길 (송도테크노파크 나노표면기술실) ;
  • 김형철 (인천전문대학 컴퓨터응용 기계설계과) ;
  • 홍원석 (한국기계연구원 청정환경기계연구센터) ;
  • 최성창 (송도테크노파크 나노표면기술실)
  • Published : 2008.07.27
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Abstract

Nano-sized $TiO_2$-60 wt% SrO composite powders were synthesized by a sol-gel method using titanium isopropoxide and $Sr(OH)_2\;{\cdot}\;8H_2O$ as precursors. 3, -5, -7 wt%Ag spot-coated $TiO_2$-60 wt% SrO composite powders were synthesized by a Ag electroless deposition method using $TiO_2$-60 wt% SrO composite powders calcined at $1050^{\circ}C$, which mainly exhibited the $SrTiO_3$phase. However, a small number of rutile $TiO_2$, $Sr_2TiO_4$ and $SrO_2$ phases were also detected. In the Ag spot-coated powders synthesized by electroless deposition, nano-sized particles about 5-25 nm in diameter adhered to the $TiO_2$-60 wt% SrO composite powders. The photocatalytic activity of Ag spot-coated $TiO_2$-SrO and $TiO_2$-SrO composite powders for degradation of phenol showed that all of $TiO_2$-SrO composite powders were highly active under UV light irradiation. 7 wt%Ag spot-coated $TiO_2$-60wt.%SrO composite powders had a relatively higher photocatalytic activity than did $TiO_2$-SrO composite powders under visible light.

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References

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