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Article

Zn/La Mixed Oxides Prepared by Coprecipitation: Synthesis, Characterization and Photocatalytic Studies

1
Department of Chemical Engineering, Faculty of Chemical Engineering and Environmental Protection, “Gheorghe Asachi” Technical University of Iasi, 73, Prof.dr.doc. D. Mangeron Blvd., 700050 Iasi, Romania
2
Ecole Nationale Supérieure de Chimie de Rennes, Univ Rennes, CNRS, ISCR—UMR6226, F-35000 Rennes, France
3
Department of Materials and Chemical Engineering, Faculty of Chemical, Complutense University of Madrid, Av. Séneca, 2, 28040 Madrid, Spain
4
Department of Chemistry, Faculty of Chemistry, “Alexandru Ioan Cuza” University of Iasi, Bvld. Carol I No 11, 700506 Iasi, Romania
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(21), 4916; https://doi.org/10.3390/ma13214916
Received: 18 September 2020 / Revised: 28 October 2020 / Accepted: 29 October 2020 / Published: 31 October 2020
(This article belongs to the Special Issue Synthesis and Applications of Nanoparticles)
Mixed oxides containing zinc and lanthanum were prepared by coprecipitation in alkaline medium, followed by calcination at 400 °C. The initial precipitation product and the calcined form were characterized by Brunauer–Emmett–Teller (BET) method adsorption of nitrogen at −196 °C, Scanning Electron Microscopy/Electron-Probe Microanalysis (SEM/EPM), Ultraviolet—Diffuse Reflectance Spectroscopy (UV-DRS) and Infrared (IR) spectroscopy. The band gap slightly changes from 3.23 eV to 3 eV by calcination. The photocatalytic performance of the solids were investigated in diluted aqueous medium, by using clofibric acid (CA), a stable and toxic molecule used as precursor in some pesticides and drugs, as test compound, possibly found in the wastewaters in low concentrations. The effects of the degradation extent, determined by high performance liquid chromatography (HPLC) and total organic carbon (TOC) measurements, were investigated at different initial concentrations of CA. Within about 60 min the CA degradation is almost total at low concentration values (3 ppm) and reaches over 80% in 180 min for an initial concentration of 50 ppm. Moreover, the CA removal performance of photocatalyst remains excellent after three cycles of use: the removal yield was practically total after 60 min in the first two cycles and reached 95% even in the third cycle. View Full-Text
Keywords: lanthanum; mixed oxides; photocatalytic performance; photocatalyst reuse; zinc lanthanum; mixed oxides; photocatalytic performance; photocatalyst reuse; zinc
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MDPI and ACS Style

Sescu, A.M.; Harja, M.; Favier, L.; Berthou, L.O.; Gomez de Castro, C.; Pui, A.; Lutic, D. Zn/La Mixed Oxides Prepared by Coprecipitation: Synthesis, Characterization and Photocatalytic Studies. Materials 2020, 13, 4916. https://doi.org/10.3390/ma13214916

AMA Style

Sescu AM, Harja M, Favier L, Berthou LO, Gomez de Castro C, Pui A, Lutic D. Zn/La Mixed Oxides Prepared by Coprecipitation: Synthesis, Characterization and Photocatalytic Studies. Materials. 2020; 13(21):4916. https://doi.org/10.3390/ma13214916

Chicago/Turabian Style

Sescu, Amalia M., Maria Harja, Lidia Favier, Laurence O. Berthou, Consuelo Gomez de Castro, Aurel Pui, and Doina Lutic. 2020. "Zn/La Mixed Oxides Prepared by Coprecipitation: Synthesis, Characterization and Photocatalytic Studies" Materials 13, no. 21: 4916. https://doi.org/10.3390/ma13214916

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