| Full text | |
| Author(s): |
Yamakawa, Gabriel Franco
;
Ribeiro, Lara Kelly
;
Reis, Roberta Yonara Nascimento
;
Mascaro, Lucia Helena
;
Longo, Elson
;
Assis, Marcelo
Total Authors: 6
|
| Document type: | Journal article |
| Source: | CATALYSIS SCIENCE & TECHNOLOGY; v. 15, n. 13, p. 12-pg., 2025-05-21. |
| Abstract | |
Sulfones are valuable compounds with diverse applications in pharmaceuticals and materials science. In this study, we present a promising approach for the efficient oxidation of sulfides to sulfones using WO3 supported on chitosan-derived carbon as a heterogeneous catalyst. The method is based on the green synthesis of WO3 particles via the coprecipitation method, followed by their impregnation onto a carbon support obtained through chitosan pyrolysis, with loadings of 10, 20, and 40% (w/w). The heterostructure of the WO3/carbon nanocomposite promotes charge separation due to interactions between the semiconductor and the pi electrons of the carbon matrix. Among the tested catalysts, the 20% WO3 composition exhibited the best performance. The optimized reaction conditions were 60 degrees C, 120 min of reaction time, 8 equivalents of oxidant (H2O2), and 10 mg of catalyst. The choice of solvent played a crucial role, with conversions exceeding 99% achieved in both acetonitrile and water. However, catalyst stability was higher in water, while deactivation in acetonitrile was attributed to WO3 leaching, as confirmed by X-ray photoelectron spectroscopy analysis. Beyond its excellent scalability, the catalytic system effectively oxidized a wide range of substrates, in particular in acetonitrile. Mechanistic investigations revealed that hydroxyl radicals (*OH) and singlet oxygen (1O2) were the primary reactive species driving the oxidation process. This work underscores the versatility and robustness of WO3/carbon catalysts for sulfide oxidation, establishing a promising platform for sustainable and efficient chemical transformations. (AU) | |
| FAPESP's process: | 23/08525-7 - Development of 3D marine collagen-based wound dressings enriched with functional nanoparticles for the regeneration of cutaneous wounds. |
| Grantee: | Marcelo de Assis |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 23/01415-1 - Influence of rare-earth doping on the BiVO4 photoanode structure for biomass degradation and fuel cells |
| Grantee: | Lucia Helena Mascaro Sales |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 21/11326-0 - Study of copper and copper oxide photoelectrodes for wastewater treatment after the COVID-19 pandemic |
| Grantee: | Roberta Yonara Nascimento Reis |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 23/12399-7 - Influence of rare-earth doping on the BiVO4 photoanode structure for biomass degradation and fuel cells |
| Grantee: | Lara Kelly Ribeiro da Silva |
| Support Opportunities: | Scholarships in Brazil - Support Program for Fixating Young Doctors |