Design of a neutral photo-electro-Fenton system with 3D-ordered macroporous Fe2O3/carbon aerogel cathode: High activity and low energy consumption

[Display omitted] •A novel 3DOM–Fe2O3/CA cathode with ordered macroporous was firstly fabricated.•More than 95% IMI and TOC removal was achieved after, respectively, 2.5 and 8h.•Macropores and channels enhance photocatalytic ability and favor OH generation.•Energy consumed in SPEF system with 3DOM–F...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2015-09, Vol.174-175, p.157-166
Main Authors: Peng, Qiusheng, Zhao, Hongying, Qian, Lin, Wang, Yanbin, Zhao, Guohua
Format: Article
Language:English
Subjects:
3D ordered marcoporous
Carbon aerogen electrode
Fe2O3
Imidacloprid
Photo-E-Fenton
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Summary:[Display omitted] •A novel 3DOM–Fe2O3/CA cathode with ordered macroporous was firstly fabricated.•More than 95% IMI and TOC removal was achieved after, respectively, 2.5 and 8h.•Macropores and channels enhance photocatalytic ability and favor OH generation.•Energy consumed in SPEF system with 3DOM–Fe2O3/CA was used more effectively.•Enhanced catalytic mechanism of SPEF process with 3DOM–Fe2O3/CA was proposed. A novel three-dimensional ordered macroporous Fe2O3/CA cathode (3DOM–Fe2O3/CA) was fabricated by using self-assembled colloidal crystal template and proposed in solar photo-electro-Fenton (SPEF) process at neutral pH. 3DOM–Fe2O3/CA possessed 3D-ordered interconnecting marcopores (390–425nm) with a hollow “cylindrical tube” in the vertical direction. Compared to the traditional Fe2O3/CA electrode, the 3DOM–Fe2O3/CA presented higher photocatalytic and Fenton oxidation ability. The interconnecting macropores generated multiple scattering and slow-photon effect for increasing light harvesting efficiency, while the nice channels minimized tortuosity and provided much more efficient mass transport. Almost complete removal of 200mgL−1 imidacloprid was achieved in 2.5h with 3DOM–Fe2O3/CA. The dynamic analysis showed that the degradation of imidacloprid follows the pseudo-first order reaction. The apparent rate constant for 3DOM–Fe2O3/CA electrode is 0.326h−1, which 2 times higher than that of reference Fe2O3/CA electrode. The energy consumption was used more effectively in SPEF with 3DOM–Fe2O3/CA. EPR and radical trapping experiments revealed that the OH radicals were main oxidants in SPEF system and 3D-ordered macroporous favored the formation of OH. Besides, 3DOM–Fe2O3/CA electrode presented very low iron leaching (
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2015.02.031