대한환경공학회지 (Journal of Korean Society of Environmental Engineers)

  • 제33권12호
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  • Pages.907-912
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  • 2011
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  • 1225-5025(pISSN)
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  • 2383-7810(eISSN)
대한환경공학회 (Korean Society of Environmental Engineers)
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수소 생산을 위한 가시광선 감응 질소 도핑 $TiO_2$와 $Nb_2O_5$ 광촉매의 개발

Development of Visible Light Responsive Nitrogen Doped Photocatalysts ($TiO_2$, $Nb_2O_5$) for hydrogen Evolution

  • 최미진 (광주과학기술원 환경공학부) ;
  • 채규정 (코오롱건설(주) 기술연구소) ;
  • 유혜원 (광주과학기술원 환경공학부) ;
  • 김경열 (광주과학기술원 환경공학부) ;
  • 장암 (성균관대학교 사회환경시스템공학과) ;
  • 김인수 (광주과학기술원 환경공학부)
  • Choi, Mi-Jin (School of Environmental Science and Engineering, Gwangju Institute of Science and Technology) ;
  • Chae, Kyu-Jung (R&D Institute, Kolon Engineering and Construction) ;
  • Yu, Hye-Weon (School of Environmental Science and Engineering, Gwangju Institute of Science and Technology) ;
  • Kim, Kyoung-Yeol (School of Environmental Science and Engineering, Gwangju Institute of Science and Technology) ;
  • Jang, Am (Civil & Environmental Engineering, Sungkyunkwan University) ;
  • Kim, In-S. (School of Environmental Science and Engineering, Gwangju Institute of Science and Technology)
  • 투고 : 2010.11.10
  • 심사 : 2011.12.30
  • 발행 : 2011.12.30
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초록

물의 광분해에 의한 수소생산을 위하여 이산화티타늄($TiO_2$)과 산화니오븀($Nb_2O_5$)을 이용하여 가시광선 감응 광촉매 개발을 본 연구의 목적으로 하고 있다. 이를 위하여 요소를 이용한 질소 도핑한 $TiO_2$, $Nb_2O_5$, $HNb_3O_8$ ($TiO_2-N$, $Nb_2O_5-N$와 $HNb_3O_8-N$)을 제조하였다. 그 결과 질소 도핑이 광촉매의 띠간격 에너지를 감소시킴으로써 excitation파장이 자외선 영역에서 가시광선 영역으로 이동한 것을 reflectance 관찰을 통해 알 수 있었다. 특히 $TiO_2-N$의 경우 띠 간격 에너지가 3.3 eV ($TiO_2$)에서 2.72 eV로 가장 큰 감소를 보였다. 또한, 가시광선 영역에서 로다민 B 광분해 반응을 통하여 광촉매의 활성도를 평가하였을 때, 질소 도핑한 경우($Nb_2O_5-N$와 $HNb_3O_8-N$)는 모두 80% 이상의 분해 효율을 나타내었으며 특히 $TiO_2-N$이 약 99.8%의 높은 분해율을 보여주었다. 그러나 질소 도핑을 하지 않은 $TiO_2$와 $Nb_2O_5$의 경우, 약 10% 의 로다민 B가 분해된 것으로 관찰되었다. 또한 가시광선 영역에서 각 촉매의 광전류 생성을 비교해보았을 때, $HNb_3O_8-N$ ($63.7mA/cm^2$)이 가장 높은 전류 반응을 나타내었으며 물의 광분해에 의한 수소생산량을 비교해보면 $Nb_2O_5-N$이 $19.4{\mu}mol/h$의 가장 많은 양을 생산한 것으로 나타났다.

Development of visible light responsive photocatalysts is a promising research area to facilitate utilization of solar energy for hydrogen production via photocatalytic water splitting. In this study two groups of samples, nitrogen (N)-doped niobium pentoxide ($Nb_2O_5$) and titanium dioxide ($TiO_2$) ($Nb_2O_5-N$, $HNb_3O_8-N$, $TiO_2-N$) and N-undoped ones ($Nb_2O_5$ and $TiO_2$) were tested. In order to utilize visible light, nitrogen atoms were doped in selected photocatalysts by using urea. A shift of the absorption edges of the Ndoped samples in the visible light region was observed. Under visible light irradiation, N-doped samples were more prominent photocatalytic activities than the N-undoped samples. Specifically, 99.7% of rhodamine B (RhB) was degraded after 60 minutes of visible light irradiation with $TiO_2-N$. Since $TiO_2-N$ shows the highest activity of RhB degradation, it was supposed to generate the highest current response. However, $HNb_3O_8-N$ showed the highest current response ($63.7mA/cm^2$) than $TiO_2-N$. More interestingly, when we compare the hydrogen production, $Nb_2O_5-N$ produced $19.4{\mu}mol/h$ of hydrogen.

키워드

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