![]() The increase of oxidant concentration could significantly enhance the PNP degradation, while the presence of HCO 3 − and HPO 4 2− exerted great inhibition. Both hydroxyl radicals and sulfate radicals could be identified during H 2O 2/PDS activation, in which H + produced during PDS decomposition promoted H 2O 2 activation. The nZVI/H 2O 2/PDS system could function well in a wide pH range, and even 95% PNP was removed at an initial pH 10, thus markedly alleviating the pH limitations of Fenton-like processes. A synergistic effect was explored between H 2O 2 and PDS during nZVI-mediated activation, and the molar ratio of H 2O 2/PDS was a key parameter in optimizing the performance of PNP degradation. The nZVI/H 2O 2/PDS oxidation system exhibited significantly higher reactivity toward PNP degradation than the systems with a single oxidant. In this study, the simultaneous activation of H 2O 2 and persulfate by nanoscaled zero valent iron (nZVI) was investigated for the degradation of p-nitrophenol (PNP). However, they face problems such as requiring an acidic reaction pH and difficulty of Fe 2+ regeneration. H 2O 2 and persulfate (PDS) activated by iron are attracting much attention due to their strong oxidation capacity for the effective degradation of organic pollutants. ![]()
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