On the operating mode of bimetallic systems for environmental remediation

Abstract

This letter challenges the concept that Fe0/Me0 bimetallic systems enhance contaminant reduction on Me0 surfaces. It is shown on a pure thermodynamic perspective that any enhancement of contaminant reduction by Fe0 in the presence of a second more electropositive elemental metal (Me0) is the result of an indirect process resulting from iron corrosion. This demonstration validates the concept that aqueous contaminant removal in the presence of Fe0 mostly occurs within an in situ generated oxide film on Fe0.