Abstract
Abstract In this study, the effect of Mg 2+ and Cu 2+ on the oxidative degradation of Amoxicillin (AMX) by heterogeneous Fenton-like oxidation using nanoscale zero-valent iron (nZVI) as a catalyst was investigated. It was found that about 90.0% and 54.7% of AMX was degraded in the presence of 1 mM Cu 2+ and 1 mM Mg 2+ ions respectively, while 60.2% of AMX was removed by the control sample. Scanning electron microscopy (SEM) indicated that nZVI aggregated visibly after degradation of amoxicillin. X-ray photoelectron spectrometer (XPS) confirmed the reduction of Cu 2+ to Cu 0 by Fe 0 on nZVI’s surface to form similar Fe/Cu bimetal to accelerate the degradation of AMX, and magnesium oxides or hydroxides formed on the surface of nZVI to restrain the removal of AMX. X-ray diffraction (XRD) demonstrated the existence of Fe 0 in fresh nZVI and the corrosion aggregation of nZVI to form iron oxides or hydroxides after reaction. Kinetics studies demonstrated a pseudo first-order kinetics model for the oxidative degradation with the observed maximum K obs as 0.0867 min −1 in the presence of 1 mM Cu 2+ . The reason for this enhanced bimetallic catalytic activity is discussed.
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