Ultradurable fluorinated V2AlC for peroxymonosulfate activation in organic pollutant degradation processes

Vanadium-based catalysts are considered the most promising materials to replace cobalt-based catalysts for the activation of peroxymonosulfate (PMS) to degrade organic pollutants. However, these traditional vanadium species easily leak out metal ions that can affect the environment, even though the of vanadium is much less than that of cobalt. Compared to other vanadium-based catalysts, e.g., V2O3, fluorinated V2AlC shows a high and constant activity and reusability regarding PMS activation. Furthermore, it features extremely low ion leakage. Active oxygen species scavenging and electron spin resonance measurements reveal that the main reactive oxygen species was O-1(2), which was induced by a two-dimensional confinement effect. More importantly, for the real-life application of tetracycline (TC) degradation, the introduction of fluorine changed the adsorption mode of TC over the catalyst, thereby changing the degradation path. The intermediate products were detected by liquid-chromatography mass spectroscopy (LC-MS), and a possible degradation path was proposed. The environmental impact test of the decomposition products showed that the toxicity of the degradation intermediates was greatly reduced. Therefore, the investigated ultradurable catalyst material provides a basis for the practical application of advanced PMS oxidation technology. (C) 2022, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.

Automated summary

Fluorinated V2AlC is a durable vanadium-based catalyst showing high and constant activity in peroxymonosulfate (PMS) activation for organic pollutant degradation. The catalyst exhibits extremely low ion leakage and induces the main reactive oxygen species O-1(2) due to a two-dimensional confinement effect. The introduction of fluorine also changes the adsorption mode of tetracycline and reduces the toxicity of degradation intermediates.