Issue 8, 2023

Effective heterogeneous Fenton-like degradation of antibiotics by ferroferric oxide nanoparticle coated reduced iron powder with accelerated Fe(ii)/Fe(iii) redox cycling

Abstract

Heterogeneous Fenton-like processes based on Fe-based catalysts are effective technology to degrade emerging organic pollutants in water and wastewater such as tetracycline (TC). However, the kinetically limited redox cycling between Fe2+ and Fe3+ is still a persistent challenge for their widespread application. To address this issue, we designed a novel Fe-based catalyst by coating reduced iron powder (RIP) with ferroferric oxide nanoparticles (FONP@RIP) using a simple chemical co-precipitation method. The reduced iron could rapidly reduce Fe(III) to Fe(II) and accelerate the cycle of Fe(II)/Fe(III) in the heterogeneous Fenton-like system. Benefiting from the accelerated cycle of Fe(II)/Fe(III), TC could be efficiently degraded in the FONP@RIP/H2O2 system over a wide pH range of 3–6, with a removal efficiency of 94.5% within 60 min (TC0 = 150 ppm). The predominant reactive oxygen species were identified as ˙OH and HO2˙. Based on the identified intermediates, the possible pathway of TC degradation was deduced and the toxicity of pollutants could also be significantly reduced during the degradation process. Moreover, FONP@RIP exhibited stable catalytic performance during multiple cyclic tests with only a marginal loss of catalytic components. This study presents a new catalyst design strategy for heterogeneous Fenton-like processes, which provides a promising way for the degradation of residual antibiotics in water and wastewater.

Graphical abstract: Effective heterogeneous Fenton-like degradation of antibiotics by ferroferric oxide nanoparticle coated reduced iron powder with accelerated Fe(ii)/Fe(iii) redox cycling

Supplementary files

Article information

Article type
Paper
Submitted
29 avr. 2023
Accepted
30 juin 2023
First published
30 juin 2023

Environ. Sci.: Nano, 2023,10, 2066-2076

Effective heterogeneous Fenton-like degradation of antibiotics by ferroferric oxide nanoparticle coated reduced iron powder with accelerated Fe(II)/Fe(III) redox cycling

J. Zhou, X. Li, Q. Yi and Z. Wang, Environ. Sci.: Nano, 2023, 10, 2066 DOI: 10.1039/D3EN00272A

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