Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Characteristics of Ag ions Photoadsorption Using Photocatalytic TiO2 Nanocrystalline Powder

광촉매용 TiO2 나노분말을 이용한 Ag이온의 흡착 특성

  • 이종국 (조선대학교 금속·재료공학부) ;
  • 유해근 (조선대학교 금속·재료공학부) ;
  • 황규홍 (경상대학교 재료공학부) ;
  • 서동석 (서울대학교 재료공학부) ;
  • 강희석 (한국원자력연구소 원자력재료기술개발팀) ;
  • 배현숙 (한국원자력연구소 원자력재료기술개발팀) ;
  • 김흥회 (한국원자력연구소 원자력재료기술개발팀)
  • Published : 2002.06.01
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Abstract

In this study photoadsorption propreties of Ag ion in AgNO$_3$ solution by TiO$_2$nanopowder synthesized by homogeneous precipitation process at low temperature were investigated. It was found that the photocatalytic redliction in AgNO$_3$solution was occurred by TiO$_2$nanopowder even under th sun light irradiation, although the reduction of Ag ions was slow with th small adsorption of 9.32 ppm. Notably the Ag adsorption was promoted in th dark condition probably owing to the chestnut bur shape of TiO$_2$ nanopowder itself. In the application of UV the Ag ions were completely adsorbed within 120 min, showing more significant photocatalytic reaction. The measured adsorption reaction rate and adsorption equilibrium rate constants were 0.0004 g/min and 1494.20(120 $m^2$/g), respectively.

이 연구는 저온균일침전법으로 제조한 루타일 상의 TiO$_2$ 나노분말을 이용하여 AgNO$_3$ 수용액 중에서 광반응 조건에 따른 Ag 이온의 광흡차 특성을 고찰하였다. 자연광을 조사하였을 경우 흡척되는 Ag의 양이 9.32ppm이며 Ag 이온의 환원 속도는 느리지만 루타일 TiO$_2$ 나노분말이 자연광에서도 광촉매 반응을 일으킨다는 것을 확인하였다. 암반응 하에서도 TiO$_2$ 나노분말 자체의 밤송이 형태 때문에 Ag흡착 반응이 진행되었으며, UV를 적용할 때에는 120분 이내에 Ag 이온이 전부 흡착되었다. 광촉매 반응이 더 중요시 됨을 알수 있었다. 흡착 반응속도상수와 흡착 평형속도상수를 계산한 결과, 각각 0.0004g/min와 1494.20(120 $m^2$/g)를 나타내었다.

Keywords

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