Issue 3, 2024

Revealing the primary role of the V4+/V5+ cycle in InVO4 catalysts for promoting the photo-Fenton reaction

Abstract

Surface oxygen and metal defects can promote the performance of photocatalysts significantly, but their role in the activation of hydrogen peroxide (H2O2) for pollutant degradation is not clear. Herein, the surface oxygen vacancies (VO) and vanadium vacancies (VV: V4+/V5+) of InVO4 catalysts were adjusted using different surfactants. Among them, a cationic surfactant with a hydrophilic head of quaternary ammonium ions facilitated the formation of surface vanadium vacancies (V4+/V5+) on the InVO4 crystal. This VV-dominated InVO4 exhibited the optimal degradation rate of rhodamine B and microcystin-LR (MC-LR) with H2O2 (0.045 M) at neutral pH under visible-light irradiation, which was ∼8.2-times versus 3.2-times larger than that of the Vo-dominated InVO4 system. The cycle of V4+/V5+ decomposed H2O2 to yield hydroxyl radicals (·OH) and superoxide radicals (·O2) continuously, which degraded organic pollutants efficiently. This study provides insights into the primary role of the V4+/V5+ cycle in InVO4 catalysts for promoting the photo-Fenton reaction via adjuration of surfactants.

Graphical abstract: Revealing the primary role of the V4+/V5+ cycle in InVO4 catalysts for promoting the photo-Fenton reaction

Supplementary files

Article information

Article type
Paper
Submitted
28 oct. 2023
Accepted
29 déc. 2023
First published
29 déc. 2023

Environ. Sci.: Nano, 2024,11, 942-950

Revealing the primary role of the V4+/V5+ cycle in InVO4 catalysts for promoting the photo-Fenton reaction

L. Jin, H. Liu, L. Ye, Y. Huang, X. Liu and D. Huang, Environ. Sci.: Nano, 2024, 11, 942 DOI: 10.1039/D3EN00776F

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