Electro-Oxidation of Humic Acids Using Platinum Electrodes: An Experimental Approach and Kinetic Modelling

Humic acids (HA) are a potential hazard to aquatic ecosystems and human health. Because biological treatment of contaminated water does not satisfactorily remove these pollutants, novel approaches are under evaluation. This work explores electrochemical oxidation of HA in aqueous solution in a lab-s...

Full description

Saved in:
Bibliographic Details
Published in:Water (Basel) 2020-08, Vol.12 (8), p.2250
Main Authors: Salvestrini, Stefano, Fenti, Angelo, Chianese, Simeone, Iovino, Pasquale, Musmarra, Dino
Format: Article
Language:English
Subjects:
Acids
Analysis
Aquatic ecosystems
Aqueous solutions
Biological treatment
Carbon
Chemical properties
Chlorides
Chromatography
Coated electrodes
Control
Current density
Electric currents
Electrochemical oxidation
Electrochemistry
Electrodes
Electrolytes
Experiments
Humic acid
Humic acids
Hydroxyapatite
Ionic strength
Landfill
Leachates
Molecular weight
Oxidation
Oxidation-reduction reaction
Platinum
Pollutant removal
Pollutants
Purification
Sewage
Spectrum analysis
Surgical implants
Water pollution
Water treatment
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:Humic acids (HA) are a potential hazard to aquatic ecosystems and human health. Because biological treatment of contaminated water does not satisfactorily remove these pollutants, novel approaches are under evaluation. This work explores electrochemical oxidation of HA in aqueous solution in a lab-scale apparatus using platinum-coated titanium electrodes. We evaluated the effects of HA concentration, current density, chloride concentration and ionic strength on the rate of HA oxidation. The initial reaction rate method was used for determining the rate law of HA degradation. The results showed that the reaction rate was first-order relative to HA concentration, chloride concentration and current density. An appreciable effect of ionic strength was also observed, most likely due to the polyanionic character of HA. We propose a kinetic model that satisfactorily fits the experimental data.
ISSN:2073-4441
2073-4441
DOI:10.3390/w12082250