Abstract
ABSTRACT For the last couple of decades, the Fenton (-like) systems have been extensively studied for oxidation of organiccontaminants in water. Recently, zero-valent iron (ZVI) has received attention as a Fenton catalyst as well as a reducingagent capable of producing reactive oxidants from oxygen. In this study, the ZVI-based Fenton reaction was assessed forthe oxidative degradation of phenol using ZVI/O 2 , ZVI/H 2 O 2 , ZVI/Oxalate/O 2 and hv/ZVI/Oxalate/O 2 systems. Reactionparameters such as pH and reagent dose (e.g., ZVI, H 2 O 2 , and oxalate) were examined. In the presence of oxalate (ZVI/Oxalate/O 2 and hv/ZVI/Oxalate/O 2 systems), the degradation of phenol was greatly enhanced at neutral pH values. It wasfound that ZVI accelerates the Fenton reaction by reducing Fe(III) into Fe(II). The conversion of Fe(III) into Fe(II) by ZVIwas more stimulated at acidic pH than at near-neutral pH values.Key words :Advanced oxidation process, Fenton reaction, Zero-valent iron, Hydroxyl radical, Phenol oxidation
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