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Issue 7, 2018
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Degradation mechanisms of cefotaxime using biochar supported Co/Fe bimetallic nanoparticles

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Abstract

Ecological risks caused by residual antibiotics have increasingly attracted great attention. In this study, a highly efficient novel adsorbent based on Co/Fe bimetallic nanoparticles loaded with alkali modified biochar (Co/Fe/MB) was prepared to remove cefotaxime from an aqueous solution. The prepared composites were characterized with X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effects of Co loading, adsorbent dosage, initial solution pH and anions (Cl, HCO3 and EDTA) on the removal of cefotaxime were investigated. Due to the synergetic reaction of the adsorption and reduction mechanism, Co/Fe/MB revealed the highest cefotaxime removal efficiency (99.23%) in 100 min at the condition of pH = 5, T = 298 K, Co/Fe/MB dosage = 0.8 g L−1, Co loading = 0.4 wt%, cefotaxime = 20 mg L−1. The removal efficiency was further enhanced in the presence of EDTA and Cl because of the destruction of a passivation layer on iron surface. Additionally, the degradation products and possible degradation pathway of cefotaxime by Co/Fe/MB were analyzed by high performance liquid chromatography-electrospray ionization mass spectrometry (HPLC-ESI-MS). The spectra revealed that the opening and cleavage of the β-lactam ring was the first step for cefotaxime degradation. The Co/Fe/MB composite was found to be an efficient material to remove cefotaxime from the solution.

Graphical abstract: Degradation mechanisms of cefotaxime using biochar supported Co/Fe bimetallic nanoparticles

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Supplementary files

Article information


Submitted
18 Mar 2018
Accepted
08 May 2018
First published
11 May 2018

Environ. Sci.: Water Res. Technol., 2018,4, 964-975
Article type
Paper

Degradation mechanisms of cefotaxime using biochar supported Co/Fe bimetallic nanoparticles

H. Wu, Q. Feng, P. Lu, M. Chen and H. Yang, Environ. Sci.: Water Res. Technol., 2018, 4, 964
DOI: 10.1039/C8EW00163D

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