Effects of various ions on the dechlorination kinetics of hexachlorobenzene by nanoscale zero-valent iron
Journal
Chemosphere
Journal Volume
88
Journal Volume
88
Journal Issue
11
Journal Issue
11
Pages
1346-1352
Start Page
1346
End Page
1352
ISSN
00456535
Date Issued
2012-09
Author(s)
Abstract
The effect of several anions and cations normally co-present in soil and groundwater contamination sites on the degradation kinetics and removal efficiency of hexachlorobenzene (HCB) by nanoscale zero-valent iron (NZVI) particles was examined. The degradation kinetics was not influenced by the HCO3-, Mg2+, and Na+ ions. It was enhanced in the presence of the Cl- and SO42- ions due to their corrosion promotion. The NO3- competes with HCB so it inhibits the degradation reaction. The Fe2+ ions would inhibit the degradation reaction due to passivation layer formed, while it was enhanced in the presence of Cu2+ ions resulted from the reduced form of copper on NZVI surfaces. These observations lead to a better understanding of HCB dechlorination with NZVI particles and can facilitate the remediation design and prediction of treatment efficiency of HCB at remediation sites.
Subjects
Anions
Cations
Degradation
Hexachlorobenzene (HCB)
Nanoscale zero-valent iron (NZVI)
SDGs
Publisher
Elsevier Ltd
Type
journal article