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oai:riuma.uma.es:10630/360402026-02-03T11:14:51Zcom_10630_2254col_10630_37953

Facile synthesis of visible-responsive photocatalytic Eu-doped layered double hydroxide for selective removal of NOx pollutant Pastor Espejo, Adrián Chen, Chunping De Miguel Rojas, Gustavo Martín-Jiménez, Francisco de Paula Cruz Yusta, Manuel O'Hare, Dermot M. Pavlovic Milicevic, Ivana Sánchez-Granados, Luis Óxidos de nitrógeno LDH Photocatalyst Nitrogen oxides Europium Visible Light Efficient nitrogen oxides (NOx) removal from the urban atmosphere is still a target for the researchers. Herein, a Zn2Al-CO3 based layered double hydroxide (LDH) was doped with increasing amounts of Eu3+ (0.01–0.04) and the photocatalytic oxidation of NOx gases was investigated. The LDHs were synthesized by a facile coprecipitation method at room temperature and ambient pressure. The successful Eu3+ substitution in the LDH layers induces a shift in the M−O bonds that modifies the electronic band structure of the doped photocatalysts. Compared to the undoped LDH, the NOx removal efficiency was enhanced by ∼ 17–25 % under UV–Vis light irradiation. Remarkably, a NOx removal efficiency of ∼ 47 % was attained by the optimally doped LDH under Visible irradiation (420 nm), surpassing raw LDH (∼ 9 %). Moreover, the Eu3+ doped LDHs retained its photocatalytic efficiency during long periods of irradiation during consecutive tests with high selectivity (>90 %). Photoluminescence studies indicated that Eu3+ was located in a non-centrosymmetric position, thereby producing structural disorder within the lattice. Eu doping promoted charge separation and a higher production of ⋅OH radicals as verified by time-resolved photoluminescence and electron paramagnetic resonance, respectively. We believe this work reports unprecedent results obtained by Eu-doping of Zn2Al-based LDHs under visible light for NOx photooxidation and serves as a new strategy to prepare functional LDHs for other photocatalytic applications Junta de Andalucía, Spain (PAI Groups FQM-214 and FQM-175, FQM-192) Agencia Estatal de Investigación and Spanish Government (PID2020-117516 GB-I00, PID2020- 117832RB-100). Chunping Chen acknowledges support from SCG Chemicals ublic Co Ltd. The authors acknowledge the Diamond Light Source for powder diffraction measurements. Adri´an Pastor is grateful for a contract received by Universidad de C´ordoba (Plan Propio de Investigación de la Universidad de Córdoba 2022) and for funding from Ministerio de Universidades (FPU2016-05041; EST19/00179). Funding for open access charge: Universidad de Corrdoba / CBUA. 2025-01-09T10:05:09Z 2025-01-09T10:05:09Z 2023 journal article VoR Adrián Pastor, Chunping Chen, Gustavo de Miguel, Francisco Martín, Manuel Cruz-Yusta, Dermot O'Hare, Ivana Pavlovic, Luis Sánchez. Facile synthesis of visible-responsive photocatalytic Eu-doped layered double hydroxide for selective removal of NOx pollutant, Chemical Engineering Journal, Volume 471, 2023, 144464 https://www.sciencedirect.com/science/article/pii/S1385894723031959 https://hdl.handle.net/10630/36040 10.1016/j.cej.2023.144464 eng http://hdl.handle.net/10396/25930 Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ open access application/pdf Elsevier