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Effect of POM on HCHO production from nZVI and Fe(II) in air-saturated solution as a function of reaction time (a) & (b) and POM concentration (c) & (d): [POM]0 = 2 mM for (a) & (b); reaction time = 180 min for (c) & (d); [Fe0]0 = [Fe(II)]0 = 100 μM; [methanol]0 = 100 mM.