산화은/이산화티타늄 혼합물을 광촉매로 활용한 물/메탄올 분해 수소제조

김강민; 정경미; 박노국; 이태진; 강미숙; Kang Min Kim; Kyung Mi Jeong; No-Kuk Park; Tae Jin Lee; Misook Kang

Clean Technology, Vol.21, No.4, 271-277, December, 2015

DOI10.7464/ksct.2015.21.4.271 Export Citation

산화은/이산화티타늄 혼합물을 광촉매로 활용한 물/메탄올 분해 수소제조

Hydrogen Production from Photocatalytic Splitting of Water/Methanol Solution over a Mixture of P25-TiO2 and AgxO

김강민, 정경미¹, 박노국 ¹, 이태진 ¹, 강미숙 ^†

영남대학교 화학과, 38541 경북 경산시 대학로 280
¹영남대학교 화학공학부, 712-749 경북 경산시 대학로 280

Kang Min Kim, Kyung Mi Jeong¹, No-Kuk Park², Tae Jin Lee², and Misook Kang^†

Department of Chemistry, Yeungnam University, 280 Daehak-ro, Gyeongsan-si, Gyeongbuk 38541, Korea
¹Department of Engineering in Energy and Applied Chemistry, Silla University, 700 baekyang-daero, Sasang-gu, Busan 46958, Korea
²School of Chemical Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan-si, Gyeongbuk 38541, Korea

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초록

본 연구에서는 효율적인 광 전기화학적 수소제조를 위하여 광촉매로써 상용화 촉매인 P25-티타니아와 합성한 AgxO를 적정 질량비로 혼합한 촉매를 사용하였다. AgxO는 일반적인 솔-젤법으로 합성하였으며, 은 용액의 안정화를 위해 합성과정중에 수산화테트라메틸암모늄을 첨가하고 열처리 온도를 -5, 25, 50 ℃로 다양화시켜 세 가지 형태의 산화은을 얻었다. 합성한 AgxO의 물리화학적 특성은 X-선 회절분석법(XRD), 주사전자현미경(SEM), 자외선-가시선 분광광도계(UV-Visible spectroscopy), X-선 광전자 분광법(XPS)을 이용하여 확인하였다. 물/메탄올(무게 비 1:1) 혼합용액을 광분해 한 결과, 순수 P25-티타니아보다 AgxO가 첨가된 혼합촉매에서 현저히 높은 양의 수소가 발생하였다. 보조 산화제로써 H2O2를 첨가한 경우 그리고 AgxO의 합성온도가 50 ℃일 때 가장 높은 수소 제조효율을 나타내었다. 특히, 0.9 g의 P25-티타니아와 0.1 g의 AgxO (50 ℃)를 혼합한 촉매를 사용하였을 때 8시간 반응하는 동안에 13,000 μmol의 수소가 발생하였다.

A photocatalyst which mixed by the commercialized P25-TiO2 and a synthesized AgxO was used in an appropriate weight ratio to effectively produce hydrogen gas in this study. The AgxOs were synthesized with the conventional sol-gel method, and tetramethylammonium hydroxides were added at the synthesis process in order to stabilize the solutions, and then the solutions were heat-treated at the temperatures of -5, 25, and 50 ℃, resulted to obtain the three types of silver oxides. Physicochemical properties of the synthesized AgxOs were identified through X-ray diffraction analysis (XRD), scanning emission microscopy (SEM), ultraviolet-visible spectroscopy, and X-ray photoelectron spectroscopy (XPS). In the photolysis results of water/methanol (weight ratio 1:1) solution, the mixture of P25-TiO2/AgxO exhibited a significantly higher hydrogen gases evolution, compared to that of pure P25-TiO2. Additionally, the addition of H2O2 as an supplement oxidant and in AgxO synthesized at 50 ℃ improved the hydrogen production efficiency. In particular, the emitted hydrogen gases reached to 13,000 μmol during 8 hours when a mixed catalyst, AgxO of 0.1 g and P25-TiO2 of 0.9 g, were used.

Keywords:Agio;Photocatalyst;H2 Production

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