Discoloration of methylene blue at neutral pH by heterogeneous photo-Fenton-like reactions using crystalline and amorphous iron oxides

Different iron oxides were evaluated for the discoloration of methylene blue (MB) at neutral pH by heterogeneous photo-Fenton-like reactions with a UV-LED lamp. Fe3O4, α-Fe2O3, and a-FeOOH catalysts were synthesized and characterized by X-ray diffraction, scanning electron microscopy (SEM), Raman sp...

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Auteurs principaux:	Choquehuanca Astrid, Ruiz-Montoya José G., La Rosa-Toro Gómez Adolfo
Format:	article
Langue:	EN
Publié:	De Gruyter 2021
Sujets:	iron oxide photo-fenton-like amorphous oxide crystalline oxide discoloration Chemistry QD1-999
Accès en ligne:	https://doaj.org/article/1e20f660523b43ada06371e7873e3ef4
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spelling	oai:doaj.org-article:1e20f660523b43ada06371e7873e3ef42021-12-05T14:10:44ZDiscoloration of methylene blue at neutral pH by heterogeneous photo-Fenton-like reactions using crystalline and amorphous iron oxides2391-542010.1515/chem-2021-0077https://doaj.org/article/1e20f660523b43ada06371e7873e3ef42021-09-01T00:00:00Zhttps://doi.org/10.1515/chem-2021-0077https://doaj.org/toc/2391-5420Different iron oxides were evaluated for the discoloration of methylene blue (MB) at neutral pH by heterogeneous photo-Fenton-like reactions with a UV-LED lamp. Fe3O4, α-Fe2O3, and a-FeOOH catalysts were synthesized and characterized by X-ray diffraction, scanning electron microscopy (SEM), Raman spectroscopy, Fourier transform infrared spectroscopy, and adsorption isotherms of N2. The results show high crystallinity and relatively low surface areas for Fe3O4 and α-Fe2O3, and amorphous structure with high surface area for the case of a-FeOOH. The discoloration of MB by iron oxides as catalysts was studied using UV-Vis spectroscopy. Despite the relative high adsorption of MB for magnetite (12%) compared to the other oxides, it shows a slow discoloration kinetics. Besides, amorphous oxide (named a-FeOOH) shows a higher discoloration kinetics with negligible adsorption capacity. The pseudo first-order kinetic constant values for Fe3O4, α-Fe2O3, and a-FeOOH are 5.31 × 10−3, 6.89 × 10−3, and 13.01 × 10−3 min−1; and the discoloration efficiencies at 120 min were 56, 60, and 82%, respectively. It was testified that low crystallinity iron oxide can be used in the efficient discoloration of MB by photo-Fenton process with a hand UV-A lamp.Choquehuanca AstridRuiz-Montoya José G.La Rosa-Toro Gómez AdolfoDe Gruyterarticleiron oxidephoto-fenton-likeamorphous oxidecrystalline oxidediscolorationChemistryQD1-999ENOpen Chemistry, Vol 19, Iss 1, Pp 1009-1020 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	iron oxide photo-fenton-like amorphous oxide crystalline oxide discoloration Chemistry QD1-999
spellingShingle	iron oxide photo-fenton-like amorphous oxide crystalline oxide discoloration Chemistry QD1-999 Choquehuanca Astrid Ruiz-Montoya José G. La Rosa-Toro Gómez Adolfo Discoloration of methylene blue at neutral pH by heterogeneous photo-Fenton-like reactions using crystalline and amorphous iron oxides
description	Different iron oxides were evaluated for the discoloration of methylene blue (MB) at neutral pH by heterogeneous photo-Fenton-like reactions with a UV-LED lamp. Fe3O4, α-Fe2O3, and a-FeOOH catalysts were synthesized and characterized by X-ray diffraction, scanning electron microscopy (SEM), Raman spectroscopy, Fourier transform infrared spectroscopy, and adsorption isotherms of N2. The results show high crystallinity and relatively low surface areas for Fe3O4 and α-Fe2O3, and amorphous structure with high surface area for the case of a-FeOOH. The discoloration of MB by iron oxides as catalysts was studied using UV-Vis spectroscopy. Despite the relative high adsorption of MB for magnetite (12%) compared to the other oxides, it shows a slow discoloration kinetics. Besides, amorphous oxide (named a-FeOOH) shows a higher discoloration kinetics with negligible adsorption capacity. The pseudo first-order kinetic constant values for Fe3O4, α-Fe2O3, and a-FeOOH are 5.31 × 10−3, 6.89 × 10−3, and 13.01 × 10−3 min−1; and the discoloration efficiencies at 120 min were 56, 60, and 82%, respectively. It was testified that low crystallinity iron oxide can be used in the efficient discoloration of MB by photo-Fenton process with a hand UV-A lamp.
format	article
author	Choquehuanca Astrid Ruiz-Montoya José G. La Rosa-Toro Gómez Adolfo
author_facet	Choquehuanca Astrid Ruiz-Montoya José G. La Rosa-Toro Gómez Adolfo
author_sort	Choquehuanca Astrid
title	Discoloration of methylene blue at neutral pH by heterogeneous photo-Fenton-like reactions using crystalline and amorphous iron oxides
title_short	Discoloration of methylene blue at neutral pH by heterogeneous photo-Fenton-like reactions using crystalline and amorphous iron oxides
title_full	Discoloration of methylene blue at neutral pH by heterogeneous photo-Fenton-like reactions using crystalline and amorphous iron oxides
title_fullStr	Discoloration of methylene blue at neutral pH by heterogeneous photo-Fenton-like reactions using crystalline and amorphous iron oxides
title_full_unstemmed	Discoloration of methylene blue at neutral pH by heterogeneous photo-Fenton-like reactions using crystalline and amorphous iron oxides
title_sort	discoloration of methylene blue at neutral ph by heterogeneous photo-fenton-like reactions using crystalline and amorphous iron oxides
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/1e20f660523b43ada06371e7873e3ef4
work_keys_str_mv	AT choquehuancaastrid discolorationofmethyleneblueatneutralphbyheterogeneousphotofentonlikereactionsusingcrystallineandamorphousironoxides AT ruizmontoyajoseg discolorationofmethyleneblueatneutralphbyheterogeneousphotofentonlikereactionsusingcrystallineandamorphousironoxides AT larosatorogomezadolfo discolorationofmethyleneblueatneutralphbyheterogeneousphotofentonlikereactionsusingcrystallineandamorphousironoxides
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Discoloration of methylene blue at neutral pH by heterogeneous photo-Fenton-like reactions using crystalline and amorphous iron oxides

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