Abstract
The feasibility of EDTA-chelated CuII (CuII-EDTA) removal by zero-valent iron (Fe0) in the presence of a weak magnetic field (WMF) and the involved mechanisms were systematically investigated. Fe0 combined with WMF (Fe0/WMF) was very effective for removing CuII-EDTA at pH 4.0–6.0 with the rate constants ranging from 0.1190min−1 to 0.0704min−1. Little passivation of Fe0 was observed during CuII-EDTA removal by Fe0/WMF in 8 consecutive runs when 10.0mgL−1 CuII-EDTA was dosed before the initiation of each run. The evidences presented in this study verified that CuII-EDTA was removed by decomplexation followed by reduction/adsorption. In brief, FeII released from Fe0 corrosion was rapidly oxidized by oxygen to FeIII to chelate with EDTA and release free CuII, and the detached CuII ions were subsequently reduced/removed by Fe0/FeII and co-precipitated by the generated iron (hydr)-oxides. To advance the application of Fe0/WMF technology in real practice, a magnetic propeller agitator was designed to offer WMF inside the reactor, which could greatly improve CuII-EDTA removal by Fe0 and be easily amplified.
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