Degradation of oxytetracycline by Fe(III) combined with peracetic acid

HU Hong; PAN Cheng-huan; LIU Yi-qing

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China Environmental Science ›› 2025, Vol. 45 ›› Issue (3) : 1272-1279.

Water Pollution Control

Degradation of oxytetracycline by Fe(III) combined with peracetic acid

HU Hong, PAN Cheng-huan, LIU Yi-qing

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Abstract

In this study, the degradation efficiency and mechanism of oxytetracycline (OTC) in the Fe(Ⅲ)/peracetic acid (PAA) system were investigated, and the effects of initial pH, reagents dosage and water components on OTC degradation were also explored. The results suggested that in the degradation of OTC by Fe(Ⅲ)/PAA system, Fe(Ⅲ) complexed with OTC to form Fe(Ⅲ)-OTC complex, which reduced Fe(Ⅲ) to Fe(II) through internal electron transfer. Subsequently, the generated Fe(II) catalyzed PAA to produce reactive species, thus accelerating the degradation of OTC. The results of chemical probe and radical quenching experiments showed that organic radicals (CH₃C(O)O^• and CH₃C(O)OO^•), HO^• and Fe(IV) played major roles for the degradation of OTC in Fe(III)/PAA system. Acidic conditions were beneficial to the degradation of OTC in this system, while the removal of OTC under neutral and weakly alkaline conditions was mainly due to the PAA oxidation. The removal efficiency of OTC increased gradually with the increase of PAA or Fe(Ⅲ) dosage, but their excess concentration would inhibit OTC degradation. The presence of Cl^- and natural organic matter in Fe(Ⅲ)/PAA system inhibited the degradation of OTC, while NO₃^-, SO₄^2- and HCO₃^- had little effect on OTC removal. The Fe(Ⅲ)/PAA system also had a good treatment effect on the other tetracycline pollutants.

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advanced oxidation / Fe(Ⅲ) / oxytetracycline / peracetic acid

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HU Hong, PAN Cheng-huan, LIU Yi-qing. Degradation of oxytetracycline by Fe(III) combined with peracetic acid[J]. China Environmental Science. 2025, 45(3): 1272-1279

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