Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Preparation of Wall Paper Coated with Modified TiO2 and Their Photocatalytic Effects for Removal of NO in Air

변조된 TiO2 광촉매를 이용한 벽지제조와 대기 중의 NO 제거 효과

  • Kwon, Tae-Ri (Department of Chemical Engineering, Hanbat National University, RCECT) ;
  • Roo, Wan-Ho (Department of Chemical Engineering, Hanbat National University, RCECT) ;
  • Lee, Chul-Woo (Department of Chemical Engineering, Hanbat National University, RCECT) ;
  • Lee, Won-Mook (Department of Chemical Engineering, Hanbat National University, RCECT)
  • 권태리 (한밭대학교 화학공학과, 에너지청정기술연구소) ;
  • 류완호 (한밭대학교 화학공학과, 에너지청정기술연구소) ;
  • 이철우 (한밭대학교 화학공학과, 에너지청정기술연구소) ;
  • 이원묵 (한밭대학교 화학공학과, 에너지청정기술연구소)
  • Received : 2004.04.22
  • Accepted : 2004.10.12
  • Published : 2005.02.28
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Abstract

In this study, $TiO_2$ powders were prepared by hydro-thermal synthesis with titanium tetra isopropoxide. The prepared $TiO_2$ and the commercial $TiO_2$(P-25, Degussa) were by impregnating $H_2PtCl_6$ solution or the leached solution from the waste catalytic converter of automobile. Modified photocatalysts were analyzed by ICP-AES, UV-DRS, XRD, SEM. And band-gap energy of modified photo-catalyst was found to decreased to 1.76eV and basic structure was changed upon modification by leached solution. Modified photocatalysts were coated on the wallpaper after using mixed solution with adhesive materials(PVC). And then to know the modified photo catalysts tested the reactivity and quantum efficiency in the mixed gas with NO as reactants in the photo catalytic reactor. In the gas phase, photo-catalytic activity of NO was the highest for modified P-25 catalysts(P-25(w)) that P-25(w) was impregnated by leached solution of wasted catalytic converter.

본 연구에서는 광촉매의 광자효율을 증가시키고, 물성을 변화시켜 광촉매 성능을 향상시키기 위하여, 자동차 폐 촉매에서 추출된 귀금속 용액 또는 $H_2PtCl_6$ 용액을 수열합성법에 의해 제조된 $TiO_2$와 상업용 $TiO_2$인 P-25(Degussa Co.)를 함침시켜 변조된 광촉매를 제조하였다. 그리고 변조된 광촉매는 ICP-AES, EDS, UV-DRS, XRD, XANES, SEM에 이용하여 물성분석 하였다. 그리고 폐 자동차 촉매전환기의 추출용액을 함침시킨 광촉매를 변조하여 band-gap energy를 1.76eV(705 nm)의 가시광 영역까지 조절하였다. 변조된 광촉매는 PVC가 주성분인 벽지 코팅제와 농도별로 혼합하여 광화학반응을 위한 기능성 도료를 제조하였다. 이 도료를 사용하여 광촉매가 코팅된 기능성 벽지를 제조하였으며, 제조된 벽지의 광촉매 성능을 평가하였다. 반응모델 물질로 NO를 이용하여 촉매 조성, 반응물 농도, 벽지의 촉매 담지량, 반응시간에 따른 광 화학반응속도를 측정하였다. 그 결과 폐 자동차 촉매전환기의 추출용액으로 변조된 $TiO_2$의 광촉매 활성이 크게 증가하였음을 알 수 있었고 그 중에서도 P-25에 추출용액을 함침시킨 P-25(w)의 광촉매가 가장 우수한 광촉매활성도를 나타내었다.

Keywords

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