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Article Dans Une Revue Water Research Année : 2024

Unveiling the oxidation mechanism of persistent organic contaminants via visible light-induced dye-sensitized reaction by red mud suspension with peroxymonosulfate

Résumé

A dye-sensitized photocatalysis system was developed for degrading persistent organic contaminants using solid waste (i.e., red mud, RM) and peroxymonosulfate (PMS) under visible light. Complete degradation of acid orange 7 (AO7) was achieved in RM suspension with PMS, where the co-existence of amorphous FeO(OH)/α-Fe(2)O(3) was the key factor for PMS activation. The experimental results obtained from photochemical and electrochemical observations confirmed the enhanced PMS activation due to the Fe-OH phase in RM. DFT calculations verified the acceleration of PMS activation due to the high adsorption energy of PMS on FeO(OH) and low energy barrier for generating reactive radicals. Compared to the control experiment without AO7 showing almost no degradation of other organic contaminants (phenol, bisphenol A, 4-chlorophenol, 4-nitrophenol, and benzoic acid), photo-sensitized AO7* enhanced electron transfer in the Fe(III)/Fe(II) cycle, dramatically enhancing the degradation of organic contaminants via radical ((•)OH, SO(4)(•-), and O(2)(•-)) and non-radical (dye*(+) and (1)O(2)) pathways. Therefore, the novel finding of this study can provide new insights for unique PMS activation by heterogeneous Fe(III) containing solid wastes and highlight the importance of sensitized dye on the interaction of PMS with Fe charge carrier for the photo-oxidation of organic contaminants under visible light.

Domaines

Génie chimique
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mardi 20 août 2024
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Dates et versions

hal-04513126 , version 1 (28-03-2024)

Licence

Paternité - Pas d'utilisation commerciale

Identifiants

Citer

Joohyun Kim, Jaehyeong Park, Sunho Yoon, Juri Lee, Khalil Hanna, et al.. Unveiling the oxidation mechanism of persistent organic contaminants via visible light-induced dye-sensitized reaction by red mud suspension with peroxymonosulfate. Water Research, 2024, Water Research, 253, pp.121343. ⟨10.1016/j.watres.2024.121343⟩. ⟨hal-04513126⟩
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