Abstract

Abstract Different crystallized goethites (α-FeOOH) were obtained via air oxidation. The reductive transformation and oxidative degradation of p-nitrophenol (PNP) was evaluated with as-prepared α-FeOOH as catalyst. Results showed that the α-FeOOH sample exhibited high reactivity for reduction transformation and oxidative degradation of PNP with decreasing degree of catalyst crystallization. In α-FeOOH/Fe(II) systems, low-crystalline α-FeOOH showed high surface-bound Fe(II) contents on the catalyst surface, which led to elevated PNP rates of reduction transformation. p-Aminophenol (PAP), as the main reduction transformation product of PNP, could be removed and mineralized further by photo-Fenton reaction in the low-crystalline α-FeOOH/H2O2 system under visible light irradiation. A possible mechanism was suggested for the comprehensive effect of PNP degradation during the reaction process.

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