Enhanced oxidation of aniline using Fe(III)-S(IV) system: Role of different oxysulfur radicals - Institut de Chimie de Clermont-Ferrand Accéder directement au contenu
Article Dans Une Revue Chemical Engineering Journal Année : 2019

Enhanced oxidation of aniline using Fe(III)-S(IV) system: Role of different oxysulfur radicals

Résumé

In this paper, the efficiency of Fe(III)-S(IV) system used for advanced oxidation processes (AOPs) has been investigated using aniline as a pollutant model compound in water. The chemical kinetics, influencing factors, and mechanism of aniline oxidation are examined with an emphasis on the contribution of the different oxysulfur radicals (mainly SO4− and SO5−). Our results show a significant enhancement in the efficiency of aniline oxidation observed at pH 4.0 with 1.0 mM S(IV) and 0.1 mM Fe(III) concentrations. Moreover, the degradation efficiency drastically decreases to 10% in the absence of oxygen indicating the significant role of oxygen in this type of process. Through competition kinetic experiments and radical scavenger experiments, it is shown that SO5− is responsible for about 60% of the aniline oxidation in the Fe(III)-S(IV) system under the typical conditions investigated in this work. For the first time we have determined the second order rate constant between SO5− and aniline (5.8 ± 0.6 × 106 M−1 s−1 (at pH 3.0) and SO4− and aniline 7.7 ± 0.5 × 109 M−1 s−1 (at pH 3.0)). Sequential experiments with successive additions of sulfite drastically improve the oxidation efficiency. These findings may provide a precise understanding of the overall mechanism and may have promising implications in developing a new cost-effective technology for the treatment of organic compounds-containing water. Furthermore, the results of this work help to understand the relevance and mechanism of organic contaminants oxidation by SO5−, which has not been given much attention in conventional SR-AOPs using peroxymonosulfate.

Domaines

Chimie
Fichier principal
Vignette du fichier
Revised manuscript.pdf (713.2 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-02190110 , version 1 (07-12-2020)

Identifiants

Citer

Yanan Yuan, Tao Luo, Jing Xu, Jinjun Li, Feng Wu, et al.. Enhanced oxidation of aniline using Fe(III)-S(IV) system: Role of different oxysulfur radicals. Chemical Engineering Journal, 2019, 362, pp.183-189. ⟨10.1016/j.cej.2019.01.010⟩. ⟨hal-02190110⟩
52 Consultations
187 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More