Abstract
AbstractAqueous contaminant removal in the presence of metallic iron is often regarded as a reductive transformation mediated by the Fe0 surface. However, successful removal of theoretically nonreducible contaminants has been largely reported. This article presents a rebuttal of the concept of contaminant reductive transformation. It is argued through a careful examination of the evolution of the volume and adsorptive properties of iron and its corrosion products that contaminants are primarily adsorbed and coprecipitated with iron corrosion products. One may wonder how the Fe0 technology will develop with the new concept. © 2009 American Institute of Chemical Engineers Environ Prog, 2010
Highlights
In 1990 Canadian hydrogeologists have rediscovered iron corrosion as metallic iron (Fe0)became a remediation agent for contaminated aquifers, soils and waters
This paper has contributed to open a new avenue for the scientific understanding of processes of contaminant removal in Fe0/H2O systems
Researchers and practitioners have long recognized the limits of the reductive transformation concept [11,12,13,14]
Summary
In 1990 Canadian hydrogeologists have rediscovered iron corrosion as metallic iron (Fe0)became a remediation agent for contaminated aquifers, soils and waters. The rediscovery of iron corrosion was followed by a seminal work on the mechanism of aqueous contaminant removal in the presence of Fe0 (e.g. in Fe0/H2O systems) [9]. It has been established that the most important factor responsible for immersed metal corrosion under conditions pertinent to natural waters (4.5 ≤ pH ≤ 9.5) is the electronic conductivity and the porosity of the oxide layer [23].
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