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Journal Articles RSC Advances Year : 2023

Synthesis, characterization and properties of sulfate-modified silver carbonate with enhanced visible light photocatalytic performance

Abstract

Sulfate-modified Ag2CO3 was successfully synthesized via a simple precipitation method. Its visible light photocatalytic performance against the removal of Orange G was found to be significantly enhanced in comparison with the one of pure Ag2CO3. While SO42−-Ag2CO3 ensured a removal efficiency of 100% of OG within 30 min, the unmodified Ag2CO3 exhibited a degradation threshold at hardly 60%. Likewise, the degradation rate constant in the presence of SO42−-Ag2CO3 photocatalyst was assessed to be twice that determined upon the involvement of pristine Ag2CO3. Furthermore, Total Organic Carbon (TOC) measurements evidenced the occurrence of a quasi-total mineralization of the dye pollutant upon the use of SO42−-Ag2CO3 photocatalyst. Scavenger experiments highlighted the dominant role of photo-induced h+ along with ˙O3− ozonide radicals in the OG photocatalytic oxidation mechanism. Reuse cycles revealed that the modification by SO42− is a promising route to improve the stability of silver carbonate against photocorrosion. All these improvements could be ascribed to electronic transfer from the upper SO42− HOMO to the lower Ag2CO3 conduction band.
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hal-04261486 , version 1 (02-11-2023)

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Sara Ghazi, Benaissa Rhouta, Claire Tendero, Francis Maury. Synthesis, characterization and properties of sulfate-modified silver carbonate with enhanced visible light photocatalytic performance. RSC Advances, 2023, 13 (33), pp.23076-23086. ⟨10.1039/D3RA03120A⟩. ⟨hal-04261486⟩
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