An overview of electrochemical advanced oxidation processes applied for the removal of azo-dyes

The production, commercialization and use of dyes by industries has increased significantly over the last few decades. The frequent release of liquid effluents into water bodies, which contain high loads of toxic contaminants, such as dyes and pigments, represents a substantial risk to aquatic biota...

Full description

Saved in:
Bibliographic Details
Published in:Brazilian journal of chemical engineering 2023-09, Vol.40 (3), p.623-653
Main Authors: Paquini, Lucas Destefani, Marconsini, Lília Togneri, Profeti, Luciene Paula Roberto, Campos, Othon Souto, Profeti, Demetrius, Ribeiro, Josimar
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Industrial Chemistry/Chemical Engineering
Review
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The production, commercialization and use of dyes by industries has increased significantly over the last few decades. The frequent release of liquid effluents into water bodies, which contain high loads of toxic contaminants, such as dyes and pigments, represents a substantial risk to aquatic biota, and negative influence on wildlife as a whole. Among the main dyes used in the textile industries, Azo-dyes are considered the group with the largest usability for dyeing jeans, cotton, and polyester. Considering their dangerous effect on the environment, the development of methods for the removal of these species has become forceful nowadays. The processes of oxidative degradation are considered highly efficient, especially when electrochemical advanced oxidation processes (EAOPs) are applied, such as electrochemical oxidation (EO), electro-Fenton (EF), and Heterogeneous Electro-Fenton (HEF), Photoelectro-Fenton (PEF), and Solar Photoelectro-Fenton (SPEF). Thereby, this review presents a state of the art based on these electrochemical removal technologies, taking into account their applications in some pH conditions, different types of electrodes, and different mechanisms of electro-generation of mediators when it is necessary. Furthermore, our review addresses some methods of monitoring the extent of electrochemical reactions involved in EAOPs and presents and suggests different applications in the scaling-up spectrum for pilot plant systems, discussing the issues of efficiency and feasibility for possible implementation later. Graphical abstract
ISSN:0104-6632
1678-4383
DOI:10.1007/s43153-023-00300-7