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Europium insertion into MgAl hydrotalcite-like compound to promote the photocatalytic oxidation of nitrogen oxides.
Oliva, María de Los Ángeles; Chen, Chunping; de Miguel, Gustavo; O'Hare, Dermot; Pavlovic, Ivana; Sánchez, Luis; Pastor, Adrián.
Afiliación
  • Oliva MLÁ; Departamento de Química Inorgánica, Instituto de Química para la Energía y Medioambiente, Universidad de Córdoba, Campus de Rabanales, E-14014, Córdoba, Spain.
  • Chen C; Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK.
  • de Miguel G; Departamento de Química Física y Termodinámica Aplicada, Instituto de Química para la Energía y Medioambiente, Universidad de Córdoba, Campus de Rabanales, E-14014, Córdoba, Spain.
  • O'Hare D; Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK.
  • Pavlovic I; Departamento de Química Inorgánica, Instituto de Química para la Energía y Medioambiente, Universidad de Córdoba, Campus de Rabanales, E-14014, Córdoba, Spain.
  • Sánchez L; Departamento de Química Inorgánica, Instituto de Química para la Energía y Medioambiente, Universidad de Córdoba, Campus de Rabanales, E-14014, Córdoba, Spain. Electronic address: luis-sanchez@uco.es.
  • Pastor A; Departamento de Química Inorgánica, Instituto de Química para la Energía y Medioambiente, Universidad de Córdoba, Campus de Rabanales, E-14014, Córdoba, Spain. Electronic address: q92paesa@uco.es.
Chemosphere ; 361: 142555, 2024 Aug.
Article en En | MEDLINE | ID: mdl-38851500
ABSTRACT
Easy synthesis of efficient, non-toxic photocatalysts is a target to expand their potential applications. In this research, the role of Eu3+ doping in the non-toxic, affordable, and easily prepared MgAl hydrotalcite-like compounds (HTlcs) was explored in order to prepare visible light semiconductors. Eu doped MgAl-HTlcs (MA-xEu) samples were prepared using a simple coprecipitation method (water, room temperature and atmospheric pressure) and europium was successfully incorporated into MgAl HTlc frameworks at various concentrations, with x (Eu3+/M3+ percentage) ranging from 2 to 15. Due to the higher ionic radius and lower polarizability of Eu3+ cation, its presence in the metal hydroxide layer induces slight structural distortions, which eventually affect the growth of the particles. The specific surface area also increases with the Eu content. Moreover, the presence of Eu3+ 4f energy levels in the electronic structure enables the absorption of visible light in the doped MA-xEu samples and contributes to efficient electron-hole separation. The microstructural and electronic changes induced by the insertion of Eu enable the preparation of visible light MgAl-based HTlcs photocatalysts for air purification purposes. Specifically, the optimal HTlc photocatalyst showed improved NOx removal efficiency, ∼ 51% (UV-Vis) and 39% (visible light irradiation, 420 nm), with excellent selectivity (> 96 %), stability (> 7 h), and enhanced release of •O2- radicals. Such results demonstrate a simple way to design photocatalytic HTlcs suitable for air purification technologies.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Oxidación-Reducción / Europio / Hidróxido de Aluminio / Hidróxido de Magnesio / Óxidos de Nitrógeno Idioma: En Revista: Chemosphere Año: 2024 Tipo del documento: Article País de afiliación: España Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Oxidación-Reducción / Europio / Hidróxido de Aluminio / Hidróxido de Magnesio / Óxidos de Nitrógeno Idioma: En Revista: Chemosphere Año: 2024 Tipo del documento: Article País de afiliación: España Pais de publicación: Reino Unido