Title

Heterogeneous activation of peroxymonosulfate by Co-doped Fe2O3 nanospheres for degradation of p-hydroxybenzoic acid

Author Identifier

Hongqi Sun

ORCID : 0000-0003-0907-5626

Document Type

Journal Article

Publication Title

Journal of Colloid and Interface Science

Volume

604

First Page

390

Last Page

401

Publisher

Elsevier

School

School of Engineering

RAS ID

38927

Funders

Higher Education Commission, Pakistan Edith Cowan University

Comments

Asif, A. H., Rafique, N., Hirani, R. A. K., Wu, H., Shi, L., & Sun, H. (2021). Heterogeneous activation of peroxymonosulfate by Co-doped Fe2O3 nanospheres for degradation of p-hydroxybenzoic acid. Journal of Colloid and Interface Science, 604, 390-401. https://doi.org/10.1016/j.jcis.2021.06.161

Abstract

Environmental remediation has become more effective when using nanotechnologies. In this study, iron oxide (α-Fe2O3) nanospheres with different cobalt doping levels (xCo-Fe2O3) were synthesised and applied in the heterogeneous activation of peroxymonosulfate (PMS) for the degradation of p-hydroxybenzoic acid (p-HBA). The catalyst (3Co-Fe2O3) with 3% Co doping exhibits the best performance for PMS activation, possibly because of the larger specific surface area and the tailored catalyst surface as confirmed by X-ray photoelectron spectroscopy (XPS). Reaction parameters were investigated to optimise the degradation efficiency. The metal ions leaching tests confirmed the higher stability of the catalyst, thanks to the leaching suppression by the doping of Co2+. The main contribution of free radicals (SO4•- and •OH) was confirmed by electron paramagnetic resonance (EPR) spectra, whereas partial contribution of oxygen anions and singlet oxygen (O2•-, 1O2) was observed during the quenching tests. Finally, a radical based degradation mechanism was proposed for the removal of p-HBA. It is expected to open up a novel perspective for the application of iron oxide as a potential catalyst for the removal of emerging contaminants.

DOI

10.1016/j.jcis.2021.06.161

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