4.7 Article

Ag-single atoms modified S1.66-N1.91/TiO2-x for photocatalytic activation of peroxymonosulfate for bisphenol A degradation

Journal

CHINESE CHEMICAL LETTERS
Volume 33, Issue 4, Pages 2121-2124

Publisher

ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2021.08.085

Keywords

Photo-Fenton; Single-atomic photocatalyst; Sulfate radical; Bisphenol A; PMS

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In this study, a Ag-0.23/(S-1.66-N-1.91/TiO2-x) single-atom photocatalyst was synthesized and applied for the degradation of bisphenol A (BPA) under visible-light illumination. The catalyst exhibited higher activity and mineralization rate compared to the counterpart, indicating its potential application in environmental remediation.
In this study, Ag-0.23/(S-1.66-N-1.91/TiO2-x) single-atom photocatalyst was synthesized by in-situ photoreducing of silver on S,N-TiO2-x nanocomposite and used to degrade bisphenol A (BPA) through heterogeneous activation of potassium peroxymonosulfate (PMS) under visible-light illumination. The structure, physicochemical property, morphology, and electronic property were evalutated by X-ray diffraction (XRD), Raman spectrum, X-ray photoelectron spectra (XPS), high-resolution transmission electron microscopy (HR-TEM), UV-vis diffuse reflectance spectra (UV-vis DRS), electron paramagnetic resonance (EPR) spectrum. Ag-0.23/(S-1.66-N-1.91/TiO2-x) single-atom photocatalyst exhibited 2.4 times higher activity for the synergetic degradation of BPA than that of its counterpart, and 48.73% mineralization rate of BPA also achieved. It was ascribed to the uniformly-dispersed metallic Ag atoms as the active site for accelerating the migration rate of photo-generated carrier for generation of high reactive radicals. The EPR experiments indicated that SO4 center dot- and (OH)-O-center dot was jointly involved in BPA degradation. (c) 2021 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.

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