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Hydrogen-rich water for green reduction of graphene oxide suspensions
, Article International Journal of Hydrogen Energy ; Volume 40, Issue 16 , 2015 , Pages 5553-5560 ; 03603199 (ISSN) ; Azimirad, R ; Gholizadeh, H. T ; Ghorbani, F ; Sharif University of Technology
Elsevier Ltd
2015
Abstract
Abstract H2-rich water as a green antioxidant was applied for deoxygenation of graphene oxide (GO) suspensions. The ability of H2-rich water for deoxygenation of GO sheets was found comparable to the ability of hydrazine (as a standard and powerful reductant), using X-ray photoelectron spectroscopy. In fact, the O/C ratio of GO sheets could be reduced from 0.51 to 0.21 and 0.16 by H2-rich water and hydrazine, respectively. More importantly, while C-N bond formation is one of the side effects of GO reduction by hydrazine, no chemical C-N bond was found on the H2-water-reduced GO (rGO) sheets. This also resulted in a better restoration of the graphitic structure of the H2-water-rGO, as...
Enzyme-inspired lysine-modified carbon quantum dots performing carbonylation using urea and a cascade reaction for synthesizing 2-benzoxazolinone
, Article ACS Catalysis ; Volume 11, Issue 17 , 2021 , Pages 10778-10788 ; 21555435 (ISSN) ; Kalhor, H. R ; Sharif University of Technology
American Chemical Society
2021
Abstract
Catalysts as the dynamo of chemical reactions along with solvents play paramount roles in organic transformations in long-lasting modes. Thus, developing effective and biobased catalysts in nontoxic solvents is highly in demand. In this report, carbon quantum dots (CQDs) functionalized with-lysine (Lys-CQDs) were generated from entirely nature-derived materials; they were demonstrated to be a promising catalyst for C-N bond formation in choline chloride urea (ChCl/U), a natural deep eutectic solvent (NADES). Among a number of synthesized CQDs, Lys-CQD turned out to be a powerful catalyst in the model reaction with aniline to afford phenyl urea. This type of transformation is important...