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Rojas SD, Rafaela G, Espinoza-Villalobos N, Diaz-Droguett DE, Salazar-González R, Caceres-Jensen L, Escalona N, Barrientos L. Role of Nb 2O 5 Crystal Phases on the Photocatalytic Conversion of Lignin Model Molecules and Selectivity for Value-Added Products. ChemSusChem 2024:e202301594. [PMID: 38452280 DOI: 10.1002/cssc.202301594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Revised: 02/02/2024] [Accepted: 03/07/2024] [Indexed: 03/09/2024]
Abstract
The photocatalytic conversion in aqueous media of phenol and guaiacol as a lignin model compound using Nb2O5 with different crystal phases was studied. Nb2O5 particles were synthesized using hydrothermal methods, where it was observed that changes in the solvent control their morphology and crystal phase. Different photocatalytic behavior of Nb2O5 was observed with the selected model compounds, indicating that its selection directly impacts the resulting conversion and selectivity rates as well as the reaction pathway, highlighting the relevance of model molecule selection. Photocatalytic conversion of phenol showed conversion rate (C%) up to 25 % after 2 h irradiation and high selectivity (S%) to pyrogallol (up to 50 %). Orthorhombic Nb2O5 spheres favored conversion through free hydroxyl radicals while monoclinic rods did not convert phenol. Guaiacol photocatalytic oxidation showed high conversion rate but lower selectivity. Orthorhombic and monoclinic Nb2O5 favored the formation of resorcinol with S % ~0.43 % (C % ~33 %) and ~13 % (C % ~27 %) respectively. The mixture of both phases enhanced the guaiacol conversion rate to ~55 % with ~17 % of selectivity to salicylaldehyde. The use of radical scavengers provided information to elucidate the reaction pathway for these model compounds, showing that different reaction pathways may be obtained for the same photocatalyst if the model compound is changed.
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Affiliation(s)
- Susana D Rojas
- Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
- Current Address: Escuela de Ingeniería Industrial, Facultad de Ingeniería, Universidad de Valparaíso, Avenida Brasil 1786, Valparaíso, Chile
- Gran Avenida 4160, San Miguel, Santiago, Chile
| | - Gabriela Rafaela
- Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Nicole Espinoza-Villalobos
- Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Donovan E Diaz-Droguett
- Instituto de Física, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Santiago, Chile
- Centro de investigación en Nanotecnología y Materiales CIEN-UC, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
- Centro de Energía UC, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Ricardo Salazar-González
- Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Lizethly Caceres-Jensen
- Laboratorio de Fisicoquímica & Analítica (PachemLab), Nucleus of Computational Thinking and Education for Sustainable Development (NuCES), Center for Research in Education (CIE-UMCE), Departamento de Química, Universidad Metropolitana de Ciencias de la Educación, Avenida José Pedro Alessandri 774, Ñuñoa, Santiago, 776019, Chile
| | - Néstor Escalona
- Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
- Centro de investigación en Nanotecnología y Materiales CIEN-UC, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
- Millennium Nuclei on Catalytic Processes Towards Sustainable Chemistry (CSC), Santiago, Chile
- Departamento de Ingeniería Química y Bioprocesos, Escuela de Ingeniería, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
| | - Lorena Barrientos
- Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
- Centro de investigación en Nanotecnología y Materiales CIEN-UC, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
- Millennium Nuclei on Catalytic Processes Towards Sustainable Chemistry (CSC), Santiago, Chile
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González-Henríquez CM, Terraza CA, Cabrera AL, Rojas SD, Sarabia-Vallejos MA. A simple method to generate spontaneous chemisorption of metallic particles mediated by carboxylate groups from silylated oligomeric poly(amide-imide)s. POLYM INT 2017. [DOI: 10.1002/pi.5324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Carmen M González-Henríquez
- Departamento de Química; Universidad Tecnológica Metropolitana, Facultad de Ciencias Naturales, Matemáticas y del Medio Ambiente; Santiago Chile
- Programa Institucional de Fomento a la Investigación, Desarrollo e Innovación; Universidad Tecnológica Metropolitana, Facultad de Ciencias Naturales, Matemáticas y del Medio Ambiente; Santiago Chile
| | - Claudio A Terraza
- Facultad de Química; Pontificia Universidad Católica de Chile; Santiago Chile
| | - Alejandro L Cabrera
- Facultad de Física; Pontificia Universidad Católica de Chile; Santiago Chile
| | - Susana D Rojas
- Facultad de Física; Pontificia Universidad Católica de Chile; Santiago Chile
| | - Mauricio A Sarabia-Vallejos
- Escuela de Ingeniería, Departamento de Ingeniería Estructural y Geotécnica; Pontificia Universidad Católica de Chile; Santiago Chile
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