Decolorization and mineralization of diazo dye under artificial and solar light assisted Fenton and photo-Fenton conditions

Ibtissem Bousnoubra; Soumia Fassi; Kamel E. Djebbar

doi:10.1515/ijcre-2021-0002

Article

Decolorization and mineralization of diazo dye under artificial and solar light assisted Fenton and photo-Fenton conditions

Ibtissem Bousnoubra , Soumia Fassi and Kamel E. Djebbar

Published/Copyright: April 22, 2021

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From the journal International Journal of Chemical Reactor Engineering Volume 19 Issue 5

Abstract

The aim of this study is to verify the ability of some photochemical processes in the absence of light (Fenton) and in its presence (photolysis/UV, photo-Fenton/UV and photo-Fenton/Solar) to obtain total decolorization and mineralization of an diazo dye in aqueous solution: the Evans Blue (abbreviated as EB). Batch experiments were carried out to evaluate, on the first stage, the influence of different processes on EB decolorization and mineralization. During the second stage the optimal operational conditions like: H₂O₂ dosage, EB concentration and source of light were investigated. The reaction efficiencies have been compared for the same system in the dark or under the assistance of an artificial or solar light source. The obtained results showed that color removal followed the increasing order: photolysis/UV (18.2%) < Fe(II)/H₂O₂ (64.12%) < Fe(II)/H₂O₂/UV_365 nm (83.4%) < Fe(II)/H₂O₂/solar light (86.3%) < Fe(II)/H₂O₂/UV_254 nm (99.9%) with a reaction time of 60 min This improvement could be related to a better production of radicals OH^•. In another hand, The efficiency of substrate mineralization in each process has been comparatively discussed by total organic carbon (TOC) and total chemical oxygen demand content of EB solutions.

Keywords: decolorization; Evans Blue; Fenton and photo-Fenton reaction; mineralization; solar light

Corresponding author: Soumia Fassi, Laboratory of Science and Technology Environment, Department of Chemistry, Faculty of Sciences, University of Constantine, Constantine, 25000, Algeria, E-mail: fassisoumia@umc.edu.dz

Funding source: Algeria Government, Ministry of Higher Education and Scientific Research

Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: The authors thank the Algeria Government (Ministry of Higher Education and Scientific Research) for the financial support.
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2021-01-02

Accepted: 2021-04-10

Published Online: 2021-04-22

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Articles in the same Issue

https://doi.org/10.1515/ijcre-2021-0002

Keywords for this article

decolorization; Evans Blue; Fenton and photo-Fenton reaction; mineralization; solar light