Comprehensive Effect of P-Nitrophenol Degradation in the Iron Oxide/Oxalate Suspension
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The degradation and transformation of p-nitrophenol (PNP) was evaluated with as-prepared iron oxides (γ-FeOOH, Fe3O4, and α-Fe2O3) as catalyst. Results showed that α-Fe2O3 exhibited higher catalytic activity than the other two samples for reduction transformation and oxidative degradation of PNP. α-Fe2O3 showed higher surface-bound Fe(II) contents in the presence of oxalic acid and stronger affinity to PNP, leading to an increase in PNP reductive transformation. And α-Fe2O3 could effectively adsorb visible light and hinder the recombination of charge carriers, resulting in higher oxidative degradation activity. p-Aminophenol (PAP), as the main reduction transformation product of PNP, could be removed further by oxidative degradation in the reaction system itself. A possible mechanism was suggested for the comprehensive effect of PNP degradation during the reaction process.
KeywordsIron oxide Oxalic acid P-Nitrophenol P-aminophenol Degradation
This work was supported by the National Natural Science Foundation of China (21477032, 21277040).
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