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Vieira DF, Borges ID, Aguiar AS, Duarte VS, d'Oliveira GD, Vaz WF, Costa RF, Perez CN, Napolitano HB. A comparative structural analysis of arylsulfonamide chalcones with potential as a biofuel additive. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.134736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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Borges ID, Faria ECM, Custódio JFM, Duarte VS, Fernandes FS, Alonso CG, Sanches-Neto FO, Carvalho-Silva VH, Oliveira GR, Napolitano HB. Insights into chalcone analogues with potential as antioxidant additives in diesel-biodiesel blends. RSC Adv 2022; 12:34746-34759. [PMID: 36545583 PMCID: PMC9720506 DOI: 10.1039/d2ra07300e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 11/17/2022] [Indexed: 12/11/2022] Open
Abstract
Biodiesel production is one of the promising strategies to reduce diesel consumption and an important contribution to climate change. However, biodiesel stability remains a challenging problem in biofuel use in the global energy matrix. In this context, organic additives have been investigated to minimize these problems and reduce harmful emissions to comply with fuel requirement standards. In this study, we discuss a comprehensive structural description, a behavior of B15 [85% volume of diesel and 15% volume of biodiesel (B100)] stability in the presence of antioxidants (chalcone analogues), and a theoretical calculation to pave the way for clarifying and expanding the potential of title compounds as an antioxidant additive for diesel-biodiesel blends. Finally, a systematic description of the oxidation stability was undertaken using a specialized machine learning computational pySIRC platform.
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Affiliation(s)
- Igor D. Borges
- Grupo de Química Teórica e Estrutural de Anápolis, Universidade Estadual de GoiásAnápolisGOBrazil+55 (62) 3328-1156,Centro de Pesquisa e Eficiência Energética, CAOA Montadora de Veículos LTDAAnápolisGOBrazil
| | - Eduardo C. M. Faria
- Grupo de Química Teórica e Estrutural de Anápolis, Universidade Estadual de GoiásAnápolisGOBrazil+55 (62) 3328-1156,Centro de Pesquisa e Eficiência Energética, CAOA Montadora de Veículos LTDAAnápolisGOBrazil
| | - Jean F. M. Custódio
- Grupo de Química Teórica e Estrutural de Anápolis, Universidade Estadual de GoiásAnápolisGOBrazil+55 (62) 3328-1156
| | - Vitor S. Duarte
- Grupo de Química Teórica e Estrutural de Anápolis, Universidade Estadual de GoiásAnápolisGOBrazil+55 (62) 3328-1156,Centro de Pesquisa e Eficiência Energética, CAOA Montadora de Veículos LTDAAnápolisGOBrazil
| | | | | | - Flávio O. Sanches-Neto
- Grupo de Química Teórica e Estrutural de Anápolis, Universidade Estadual de GoiásAnápolisGOBrazil+55 (62) 3328-1156,Instituto de Química, Universidade de BrasíliaBrasíliaDFBrazil
| | - Valter H. Carvalho-Silva
- Grupo de Química Teórica e Estrutural de Anápolis, Universidade Estadual de GoiásAnápolisGOBrazil+55 (62) 3328-1156
| | | | - Hamilton B. Napolitano
- Grupo de Química Teórica e Estrutural de Anápolis, Universidade Estadual de GoiásAnápolisGOBrazil+55 (62) 3328-1156
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de la Flor MP, Camarillo R, Martínez F, Jiménez C, Quiles R, Rincón J. Removal of emerging pollutant dibutylhydroxytoluene from water with CNT/TiO 2 catalysts in a visible LED photoreactor. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:23720-23730. [PMID: 33078360 DOI: 10.1007/s11356-020-11126-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Accepted: 10/04/2020] [Indexed: 06/11/2023]
Abstract
For the photocatalytic degradation of antioxidant 2,6-di-tert-butyl-hydroxytoluene (BHT), several TiO2-based composites have been prepared in MWCNT from titanium isopropoxide and ethanol via supercritical CO2 synthesis followed by calcination at 400 °C. TEM and XRD showed uniform coverage of CNT by 10 nm TiO2 particles in the anatase form, and spectral analyses revealed the formation of CNT/TiO2 structure. Further, synthesized material displayed significant visible light absorption and absorption edge shifted to longer wavelengths. Once the material was characterized, the effect of adsorption and photochemical degradation of BHT was investigated in the wavelength range from 400 to 700 nm, in batch mode, by monitoring the concentrations of BHT as a function of time. CNT/TiO2 composites were more efficient than commercial TiO2 P25 in the photodegradation of the antioxidant. In particular, CNT50/TiO250, a composite with 50% by weight of CNT, was the best catalyst, stable, and completely degrading BHT within 30 min of exposure to visible light. The role played by different reactive oxidative species (h+, OH ·, 1O2, and [Formula: see text]) in the photocatalytic reaction was also studied by using appropriate radical scavengers that inhibited the corresponding active species. Superoxide radical was found the main oxidizing agent.
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Affiliation(s)
- María Patricia de la Flor
- Department of Chemical Engineering, Faculty of Environmental Sciences and Biochemistry, University of Castilla-La Mancha, Avda. Carlos III, s/n, 45071, Toledo, Spain
| | - Rafael Camarillo
- Department of Chemical Engineering, Faculty of Environmental Sciences and Biochemistry, University of Castilla-La Mancha, Avda. Carlos III, s/n, 45071, Toledo, Spain
| | - Fabiola Martínez
- Department of Chemical Engineering, Faculty of Environmental Sciences and Biochemistry, University of Castilla-La Mancha, Avda. Carlos III, s/n, 45071, Toledo, Spain
| | - Carlos Jiménez
- Department of Chemical Engineering, Faculty of Environmental Sciences and Biochemistry, University of Castilla-La Mancha, Avda. Carlos III, s/n, 45071, Toledo, Spain
| | - Rafael Quiles
- Department of Chemical Engineering, Faculty of Environmental Sciences and Biochemistry, University of Castilla-La Mancha, Avda. Carlos III, s/n, 45071, Toledo, Spain
| | - Jesusa Rincón
- Department of Chemical Engineering, Faculty of Environmental Sciences and Biochemistry, University of Castilla-La Mancha, Avda. Carlos III, s/n, 45071, Toledo, Spain.
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Basu P, Colston KJ, Mogesa B. Dithione, the antipodal redox partner of ene-1,2-dithiol ligands and their metal complexes. Coord Chem Rev 2020; 409:213211. [PMID: 38094102 PMCID: PMC10718511 DOI: 10.1016/j.ccr.2020.213211] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Defining the oxidation state of the central atom in a coordination compound is fundamental in understanding the electronic structure and provides a starting point for elucidating molecular properties. The presence of non-innocent ligand(s) can obscure the oxidation state of the central atom as the ligand contribution to the electronic structure is difficult to ascertain. Redox-active ligands, such as dithiolene ligands, are well known non-innocent ligands that can exist in both a fully reduced (Dt2-) and fully oxidized (Dt0) states. Complexes containing the fully oxidized dithione state of the ligand are uncommon and only a few have been completely characterized. Dithione ligands are of interest due to their electron-deficient nature and ability to act as an electron acceptor for more electron-rich moieties, such as other dithiolene ligands or metal centers. This article focuses the syntheses, structures, and metal coordination, particularly coordination compounds, of dithione ligands. Various examples of mono, bis, and tris dithione complexes are discussed.
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Affiliation(s)
- Partha Basu
- Department of Chemistry and Chemical Biology, IUPUI, Indianapolis, IN 46202, United States
| | - Kyle J. Colston
- Department of Chemistry and Chemical Biology, IUPUI, Indianapolis, IN 46202, United States
| | - Benjamin Mogesa
- Department of Chemistry and Biochemistry, Duquesne University, Pittsburgh, PA 15282, United States
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