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Received March 3, 2020
Accepted April 30, 2020
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졸-겔법으로 제조된 Bismuth ferrite의 가시광 광촉매 특성
Visible Light Photocatalytic Properties of Bismuth Ferrite Prepared By Sol-Gel Method
광주여자대학교 식품영양학과, 62396 광주광역시 광산구 광주여대길 40 1순천대학교 환경공학과, 57922 전남 순천시 중앙로 255
Department of Food and Nutrition, Kwangju Women’s University, 40, Gwangjuyeodae-gil, Gwangsan-gu, Gwangju, 62396, Korea 1Department of Environmental Engineering, Sunchon National University, 255, Jungang-ro, Suncheon-si, Jeollanam-do, 57922, Korea
likeu21@hanmail.net
Korean Chemical Engineering Research, August 2020, 58(3), 486-492(7), 10.9713/kcer.2020.58.3.486 Epub 30 July 2020
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Abstract
가시광 LED 빛에 반응하는 페로브스이트형 bismuth ferrite (BFO) 광촉매 제조방법과 가시광 광촉매 반응 특성을 조사하였다. BFO는 졸-겔법에 따라 제조하였다. 제조된 BFO는 주로 BiFeO3 구조로 이루어져 있으며 Bi24Fe2O39 구조도 포함한 나노 크기의 결정을 이루고 있었다. BFO 나노 결정은 약 600 nm까지 자외선과 가시광선을 흡수하는 것을 UV-visible 확산 반사 스펙트럼으로부터 확인하였다. 확산 반사 스펙트럼으로부터 구한 BFO의 밴드갭은 약 2.2 eV로 나타났다. 포름알데히드는 585 nm와 613 nm 파장의 가시광 LED 램프의 빛과 BFO 광촉매와의 광반응에 의하여 분해되어 제거되었다. BFO의 가시광 LED 빛에서 광촉매 활성은 BFO의 좁은 밴드갭에서 기인하는 것으로 보인다.
The method for preparing a perovskite-type bismuth ferrite (BFO) photocatalyst which reacts to visible LED light and the characteristics of visible light photocatalysis were investigated. BFO was prepared according to the sol-gel method. The prepared BFO consisted mainly of BiFeO3 structure and formed a nano-sized crystal including Bi24Fe2O39 structure. The BFO nano crystallines were identified from the UV-visible diffuse reflectance spectra to absorb UV and visible light up to about 600 nm. The bandgap of the BFO determined from the diffuse reflectance spectrum was about 2.2 eV. Formaldehyde was decomposed by the photoreaction of BFO photocatalysts with the visible light LED lamps with wavelengths of 585 nm and 613 nm. The narrow bandgap of BFO led to elicit BFO photocatalytic activity in visible LED light.
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