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Singlet oxygen dominated peroxymonosulfate activation by CuO-CeO for organic pollutants degradation: Performance and mechanism.

08:00 EDT 3rd June 2019 | BioPortfolio

Summary of "Singlet oxygen dominated peroxymonosulfate activation by CuO-CeO for organic pollutants degradation: Performance and mechanism."

In this study, CuO-CeO was synthesized via an easy hydrothermal-calcination method and innovatively applied to peroxymonosulfate (PMS) activation for pollutants degradation under a non-radical oxidation pathway. Singlet oxygen (O) was the dominated reactive oxygen species in the CuO-CeO/PMS system, leading to a dramatical degradation efficiency with Rhodamine B (RhB) as model compounds. The observed rate constant of the CuO-CeO/PMS system was 7-11 times higher than that of only PMS, CeO/PMS and CuO/PMS systems. Also, under the reaction conditions of 1.6 mM PMS, 0.4 g/L catalyst and initial pH 7, the degradation efficiencies of RhB, Methylene Blue, Reactive Blue 19 and atrazine were respectively up to 100%, 85.39%, 72.84% and 98.44% in 60 min. X-ray photoelectron microscopy analysis indicated that the electrons transfer between CuO and CeO and the formation of oxygen vacancy in CeO should be responsible for the enhanced O production, which involved a new non-radical oxidation pathway for PMS activation by CuO-CeO catalyst. Moreover, the combination of CuO and CeO increased reusability and stability of catalyst, allowing it remove more than 92% of RhB over a wide pH range (pH = 3-9). This study not only proved that CuO-CeO is an efficient and stable PMS activator but also provided a new insight into PMS activation through a non-radical oxidation pathway for organic contaminants removal from wastewater.

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This article was published in the following journal.

Name: Chemosphere
ISSN: 1879-1298
Pages: 549-558

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Medical and Biotech [MESH] Definitions

An excited state of molecular oxygen generated photochemically or chemically. Singlet oxygen reacts with a variety of biological molecules such as NUCLEIC ACIDS; PROTEINS; and LIPIDS; causing oxidative damages.

Molecules or ions formed by the incomplete one-electron reduction of oxygen. These reactive oxygen intermediates include SINGLET OXYGEN; SUPEROXIDES; PEROXIDES; HYDROXYL RADICAL; and HYPOCHLOROUS ACID. They contribute to the microbicidal activity of PHAGOCYTES, regulation of signal transduction and gene expression, and the oxidative damage to NUCLEIC ACIDS; PROTEINS; and LIPIDS.

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Any substance in the air which could, if present in high enough concentration, harm humans, animals, vegetation or material. Substances include GASES; PARTICULATE MATTER; and volatile ORGANIC CHEMICALS.

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