Galvano-Fenton Engineering Solution with Spontaneous Catalyst's Generation from Waste: Experimental Efficiency, Parametric Analysis and Modeling Interpretation Applied to a Clean Technology for Dyes Degradation in Water.

Kaouther Kerboua,Naoufel Haddour,Abdulaziz Alghyamah,Hamza Ferkous,Oualid Hamdaoui

doi:10.3390/molecules26185640

Abstract

In this paper, the degradation of the diazo dye naphthol blue black (NBB) using the Galvano-Fenton process is studied experimentally and numerically. The simulations are carried out based on the anodic, cathodic, and 34 elementary reactions evolving in the electrolyte, in addition to the oxidative attack of NBB by at a constant rate of during the initiation stage of the chain reactions. The selection of the operating conditions including the pH of the electrolyte, the stirring speed, and the electrodes disposition is performed by assessing the kinetics of NBB degradation; these parameters are set to 3, 350 rpm and a parallel disposition with a 3 cm inter-electrode distance, respectively. The kinetics of in the electrolyte were monitored using the principles of Fricke dosimetry and simulated numerically. The model showed more than a 96% correlation with the experimental results in both the blank test and the presence of the dye. The effects of and concentrations on the degradation of the dye were examined jointly with the evolution of the simulated , , and concentrations in the electrolyte. The model demonstrated a good correlation with the experimental results in terms of the initial degradation rates, with correlation coefficients exceeding 98%.

Highlights

Advanced oxidation processes (AOPs) constitute a special class of oxidation techniques [1] that counts those processes based on the generation of reactive oxygen species (ROS) [2] in enough quantity to produce reclaimed effluents
In order to perform the Galvano-Fenton degradation of naphthol blue black (NBB), the experimental setup has been optimized in terms of operating conditions comprising the disposition o4f otfh2e0 electrodes, the stirring speed, and the pH of the electrolyte solution through a preliminary study
The comparison of experimental and simulated initial rates of degradation of NBB exhibits a correlation coefficient of 98.33%, which proves that the kinetic constant determined by Özcan and Özcan [20] and adopted in the present work describes well the initiation reaction of the oxidative attack of NBB by hydroxyl radical, reported in Equation (8)

Summary

Introduction

Advanced oxidation processes (AOPs) constitute a special class of oxidation techniques [1] that counts those processes based on the generation of reactive oxygen species (ROS) [2] in enough quantity to produce reclaimed effluents. HO is capable of attacking organic compounds with constant rates on the order of 108–1010 M−1·s−1 through four pathways: (i)

Objectives

Results

Conclusion