Effects of zinc salt addition on perfluorooctanoic acid (PFOA) removal by electrocoagulation with aluminum electrodes
Journal
Chemosphere
Journal Volume
288
Date Issued
2022
Author(s)
Abstract
In this study, the electrocoagulation (EC) of perfluorooctanoic acid (PFOA) by an aluminum electrode with the addition of zinc salt was investigated. Adding ZnCl2 successfully prevented a rise in pH during EC and increased the efficiency from 73.7% to over 99%. In addition, the longer the carbon chain of a PFA was, the better the removal of that PFA by electrocoagulation. The main functions of ZnCl2 were to prevent the rise in pH and improve flotation because the flocs with added ZnCl2 were easy to gather together and had a faster floating speed. The XPS results demonstrated the occurrence of bonding between aluminum and fluoride. This finding indicates that complexation between aluminum and fluoride may be the main mechanism for removal when aluminum electrodes are used to remove perfluoroalkyl (PFA) compounds. ? 2021 Elsevier Ltd
Subjects
EC
PFOA
X-ray photoelectron spectroscopy (XPS)
Aluminum chloride
Coagulation
Electrodes
Flotation
Fluorine compounds
Zinc
Zinc chloride
Aluminium electrode
Carbon chains
Effect of zincs
Electro coagulations
Floating speed
Perfluorooctanoic acid
Salt addition
X-ray photoelectron spectroscopy
Zinc salts
X ray photoelectron spectroscopy
aluminum
chemical substance
coagulation
electrode
pollutant removal
zinc
Article
electrocoagulation
water management
water pollutant
fluorocarbon
octanoic acid
perfluorooctanoic acid
Aluminum
Caprylates
Electrocoagulation
Fluorocarbons
Water Pollutants, Chemical
Water Purification
Type
journal article