영가철과 여러 가지 산화철 조합공정을 이용한 질산성질소 환원에 관한 연구

Abstract

This paper presents the feasibility of using different iron oxides (microscale hematite (HT), microscale magnetite(MT), and nanoscale maghemite (NMH)) in enhancing nitrate reduction by zero-valent iron (Fe(0)) under twosolution conditions (artificial acidic water and real groundwater). Addition of MT and NMH into Fe(0) systemresulted in enhancement of nitrate reduction compared to Fe(0) along reaction, especially in groundwater condition,while HT had little effect on nitrate reduction in both solutions. Field emission scanning electron microscopy (FESEM)analysis showed association of MT and NMH with Fe(0) surface, presumably due to magnetic attraction. Therate enhancement effect of the minerals is presumed to arise from its role as an electron mediator that facilitatedelectron transport from Fe(0) to nitrate. The greater enhancement of MT and NMH in groundwater was attributed tosurface charge neutralization by calcium and magnesium ions in groundwater, which in turn facilitated adsorption ofnitrate on Fe(0) surface.