Abstract
The wide application of zero-valent iron (ZVI) technology was limited by its slow electron transfer rate because of the dense iron oxide on ZVI surface. In this study, we reported a method to improve the performance of ZVI by ball-milling ZVI with ethylenediaminetetraacetic acid (ZVI-EDTA). The pretreatment of ZVI with EDTA provided acidic sites for ZVI surface corrosion, and thus increased the amount of surface Fe0 from 7.23% to 30.12%. Because of the promoted surface Fe0 amount, the corrosion potential of ZVI-EDTA shifted from −0.66 V to −0.75 V, and the concentration of dissolved ferrous ions and total ions increased, resulting in high efficiency in Cr(VI) removal. This study provides an effective method for enhancing the reactivity of commercial ZVI powder, which could contribute to the wide application of ZVI technology, especially in heavy metal remediation.
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