Publication

Insights into efficient activation of H2O2 by sulfur-doped CuFeO2: Important role of sulfur and sulfamethoxazole oxidation

2026

Abstract

In the field of advanced oxidation processes, the efficient activation of hydrogen peroxide (H2O2) plays a crucial role in the degradation of organic pollutants. Herein, sulfur-doped CuFeO2 (S-CuFeO2) was synthesized and exhibited enhanced catalytic activity for sulfamethoxazole (SMX) degradation via H2O2 activation. Sulfur incorporation into the CuFeO2 lattice modulates the electronic structure and surface properties, thereby facilitating H2O2 activation and promoting Osingle bondO bond cleavage and the generation of highly reactive oxygen species (ROSs). Combined quenching experiments, electron spin resonance (ESR), X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) calculations reveal that hydroxyl radicals (HO•) and superoxide radicals (O2•−) dominate the SMX degradation in oxidation process. In addition, the S-CuFeO2/H2O2 system demonstrates good stability, low metal leaching, and effective performance in different water matrices and for various organic pollutants. Toxicity evaluation further indicates a reduction in overall toxicity during degradation. This work provides mechanistic insight into H2O2 activation by sulfur-doped catalysts and offers a feasible strategy for designing efficient catalysts for antibiotic-contaminated wastewater treatment.

Official source

https://infoscience.epfl.ch/entities/publication/4b82922c-9252-4bd0-825e-ce13c677bcb5

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2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/4b82922c-9252-4bd0-825e-ce13c677bcb5

About this result

Related concepts (32)

Radical (chemistry)

In chemistry, a radical, also known as a free radical, is an atom, molecule, or ion that has at least one unpaired valence electron. With some exceptions, these unpaired electrons make radicals highly chemically reactive. Many radicals spontaneously dimerize. Most organic radicals have short lifetimes. A notable example of a radical is the hydroxyl radical (HO·), a molecule that has one unpaired electron on the oxygen atom. Two other examples are triplet oxygen and triplet carbene (꞉CH2) which have two unpaired electrons.

Reactive oxygen species

In chemistry, reactive oxygen species (ROS) are highly reactive chemicals formed from diatomic oxygen (). Examples of ROS include peroxides, superoxide, hydroxyl radical, singlet oxygen, and alpha-oxygen. The reduction of molecular oxygen () produces superoxide (), which is the precursor to most other reactive oxygen species: O2{} + e^- -> \ ^\bullet O2- Dismutation of superoxide produces hydrogen peroxide (): 2 H+{} + 2 \ ^\bullet O2^-{} -> H2O2{} + O2 Hydrogen peroxide in turn may be partially reduced, thus forming hydroxide ions and hydroxyl radicals (), or fully reduced to water: H2O2{} + e^- -> HO^-{} + \ ^\bullet OH 2 H+ + 2 e- + H2O2 -> 2 H2O In a biological context, ROS are byproducts of the normal metabolism of oxygen.

Advanced oxidation process

Advanced oxidation processes (AOPs), in a broad sense, are a set of chemical treatment procedures designed to remove organic (and sometimes inorganic) materials in water and wastewater by oxidation through reactions with hydroxyl radicals (·OH). In real-world applications of wastewater treatment, however, this term usually refers more specifically to a subset of such chemical processes that employ ozone (O3), hydrogen peroxide (H2O2) and/or UV light. AOPs rely on in-situ production of highly reactive hydroxyl radicals (·OH).

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Insights into efficient activation of H2O2 by sulfur-doped CuFeO2: Important role of sulfur and sulfamethoxazole oxidation

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