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Synergistically enhanced photocatalytic activity of graphitic carbon nitride and WO3 nanohybrids mediated by photo-Fenton reaction and H2O2

Title
Synergistically enhanced photocatalytic activity of graphitic carbon nitride and WO3 nanohybrids mediated by photo-Fenton reaction and H2O2
Authors
Yoon M.Oh Y.Hong S.Lee J.S.Boppella R.Kim S.H.Marques Mota F.Kim S.O.Kim D.H.
Ewha Authors
김동하Filipe Marques Mota
SCOPUS Author ID
김동하scopus; Filipe Marques Motascopus
Issue Date
2017
Journal Title
Applied Catalysis B: Environmental
ISSN
0926-3373JCR Link
Citation
vol. 206, pp. 263 - 270
Keywords
Carbon nitrideElectron paramagnetic resonancePhoto-Fenton reactionTungsten oxideVisible light photocatalysis
Publisher
Elsevier B.V.
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The development of solar energy conversion in the production of fuels, water splitting and water purification systems, has become an important sidestep for traditional fossil energy. Herein we have investigated the coupling effect of a Photo-Fenton system on a conventional photocatalytic reaction with a novel Fe-doped C3N4/WO3 hybrid structure. The decomposition of p-nitrophenol was selected as a model reaction in the context of the degradation of organic pollutants. Heterojunction nanocomposites consisting of g-C3N4 nanosheets and WO3 nanoparticles were shown to facilitate the separation of photo-induced electron and hole pairs. The photocatalytic activity was further maximized as a result of a synergism of the ‘Photo-Fenton cycle’ with Fe(II) or Fe(III)-doping in the presence of H2O2 to generate additional hydroxyl radicals. As a result, after 4 h under visible light the degradation of p-nitrophenol could be remarkably enhanced from 10 to 90% compared to the g-C3N4 reference. To the best of our knowledge, this is the first time such a striking increase is reported with a Photo-Fenton system applied in the present photocatalytic system. The significance of the presence of hydroxyl radicals in the photo-Fenton performance of Fe-doped C3N4/WO3 was assessed by scavenger and fluorescence tests. Additional light was shed into the reaction mechanism via spin trapping enabled by in-situ electron paramagnetic resonance. © 2017 Elsevier B.V.
DOI
10.1016/j.apcatb.2017.01.038
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자연과학대학 > 화학·나노과학전공 > Journal papers
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