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 Jūl. 2023
Accepted
23 Sept. 2023
First published
25 Sept. 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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements