Duality of Semiconductor Photocatalysts for Sulfide Oxidation in a Supercritical CO2 Medium: Graphitic Carbon Nitride (gC3N4) versus Nano Titania (TiO2)

Duality of Semiconductor Photocatalysts for Sulfide Oxidation in a Supercritical CO2 Medium: Graphitic Carbon Nitride (gC3N4) versus Nano Titania (TiO2) Full article

Journal

ACS omega
ISSN: 2470-1343

Output data

Year: 2025, Volume: 10, Number: 27, Pages: 29569-29577 Pages count : 9 DOI: 10.1021/acsomega.5c02986

Authors

Ivanova Elizaveta A. ¹ , Merkulov Vladislav G. ¹ , Gladilina Vera I. ^2,1 , Rusakov Savva P. ^2,1 , Kuchurov Ilya V. ¹ , Zharkov Mikhail N. ¹ , Zlotin Sergei G. ¹

Affiliations

1	N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect, 47, Moscow 119991, Russian Federation
2	D.I. Mendeleev University of Chemical Technology of Russia, Miusskaya sq., 9, Moscow 125047, Russian Federation

Despite the extensive application of graphitic carbon nitride (gC3N4) and nanosized titanium dioxide (TiO2) in photocatalysis, data on direct comparison of their catalytic activity under similar conditions remain scarce. This study compares gC3N4 and TiO2 for aerobic sulfide oxidation in supercritical carbon dioxide (scCO2), a green solvent. Under visible light irradiation, gC3N4 demonstrated high selectivity for sulfoxides due to its strong reductive properties, while TiO2 showed faster reaction rates but lower selectivity, driven by its higher oxidative potential. The distinct mechanisms of photooxidation on these catalysts are discussed, highlighting the electron transfer from photoactivated gC3N4 to oxygen and the direct oxidation of sulfides on the TiO2 photoinduced holes as the rate-determining steps. The work explored a wide substrate range, including aromatic and aliphatic sulfides, under optimized conditions. Both catalysts were successfully applied to the synthesis of a wide range of sulfoxides, particularly the precursor of the pharmaceutical Modafinil, demonstrating their practical utility despite moderate yields. This study underscores the potential of gC3N4 and TiO2 for sustainable and selective sulfide oxidation in a scCO2 medium, paving the way for greener methods in producing valuable sulfur-containing compounds.

Ivanova E.A. , Merkulov V.G. , Gladilina V.I. , Rusakov S.P. , Kuchurov I.V. , Zharkov M.N. , Zlotin S.G.
Duality of Semiconductor Photocatalysts for Sulfide Oxidation in a Supercritical CO2 Medium: Graphitic Carbon Nitride (gC3N4) versus Nano Titania (TiO2)
ACS omega. 2025. V.10. N27. P.29569-29577. DOI: 10.1021/acsomega.5c02986 WOS OpenAlex

Web of science:	WOS:001522326200001
OpenAlex:	W4411972257

Пока нет цитирований