Issue 11, 2023

Enhanced removal of oxytetracycline from aquatic solution using MnOx@Fe3O4 bimetallic nanoparticle coated powdered activated carbon: synergism of adsorption and chemical autocatalytic oxidation processes

Abstract

MnOx@Fe3O4 bimetallic nanoparticle coated powdered activated carbon (MnOx@Fe3O4-PAC) was successfully synthesized by a two-step chemical co-precipitation method. A comprehensive analysis of MnOx@Fe3O4-PAC's surface profile, crystal structure, and element composition was conducted to investigate its structural characteristics and oxytetracycline (OTC) removal mechanism. It was observed that MnOx@Fe3O4 bimetallic nanoparticles were distributed on surfaces, pores, and channels of PAC. The removal efficiency of OTC reached its optimum (76.8%, OTC0 = 100 mg L−1) at pH 3. Inorganic ions and humic acid (HA) had a limited impact on the adsorption process of OTC on MnOx@Fe3O4-PAC. The Freundlich isotherm and Elovich kinetic models could accurately describe the adsorption process of OTC on MnOx@Fe3O4-PAC. According to thermodynamic analysis, the adsorption process was dominated by chemisorption/surface complexation, which was a spontaneous endothermic reaction (ΔH = 51.62 kJ mol−1). The magnetically separable MnOx@Fe3O4-PAC had superior adsorption and oxidation capabilities for OTC removal from aqueous solution, and provided an alternative to PAC in the treatment of antibiotic wastewater. Furthermore, the self-catalytic reaction extended the service life of MnOx@Fe3O4-PAC without the additional use of oxidants, which made MnOx@Fe3O4-PAC a green, efficient, and recyclable composite for potentially practical applications.

Graphical abstract: Enhanced removal of oxytetracycline from aquatic solution using MnOx@Fe3O4 bimetallic nanoparticle coated powdered activated carbon: synergism of adsorption and chemical autocatalytic oxidation processes

Supplementary files

Article information

Article type
Paper
Submitted
07 júl 2023
Accepted
23 sep 2023
First published
25 sep 2023

Environ. Sci.: Nano, 2023,10, 3171-3183

Enhanced removal of oxytetracycline from aquatic solution using MnOx@Fe3O4 bimetallic nanoparticle coated powdered activated carbon: synergism of adsorption and chemical autocatalytic oxidation processes

J. Zhou and S. Wang, Environ. Sci.: Nano, 2023, 10, 3171 DOI: 10.1039/D3EN00465A

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