Zn/La Mixed Oxides Prepared by Coprecipitation: Synthesis, Characterization and Photocatalytic Studies
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 Mi...
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| Online Access: | https://www.mdpi.com/1996-1944/13/21/4916 |
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| author | Amalia Maria Sescu Maria Harja Lidia Favier Laurence Oughebbi Berthou Consuelo Gomez de Castro Aurel Pui Doina Lutic |
| author_facet | Amalia Maria Sescu Maria Harja Lidia Favier Laurence Oughebbi Berthou Consuelo Gomez de Castro Aurel Pui Doina Lutic |
| author_sort | Amalia Maria Sescu |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T15:09:40Z |
| format | Article |
| id | doaj.art-1e4d1437113f4242b9d952ed0e0341a8 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T15:09:40Z |
| publishDate | 2020-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-1e4d1437113f4242b9d952ed0e0341a82023-11-20T19:25:16ZengMDPI AGMaterials1996-19442020-10-011321491610.3390/ma13214916Zn/La Mixed Oxides Prepared by Coprecipitation: Synthesis, Characterization and Photocatalytic StudiesAmalia Maria Sescu0Maria Harja1Lidia Favier2Laurence Oughebbi Berthou3Consuelo Gomez de Castro4Aurel Pui5Doina Lutic6Department 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, RomaniaDepartment 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, RomaniaEcole Nationale Supérieure de Chimie de Rennes, Univ Rennes, CNRS, ISCR—UMR6226, F-35000 Rennes, FranceEcole Nationale Supérieure de Chimie de Rennes, Univ Rennes, CNRS, ISCR—UMR6226, F-35000 Rennes, FranceDepartment of Materials and Chemical Engineering, Faculty of Chemical, Complutense University of Madrid, Av. Séneca, 2, 28040 Madrid, SpainDepartment of Chemistry, Faculty of Chemistry, “Alexandru Ioan Cuza” University of Iasi, Bvld. Carol I No 11, 700506 Iasi, RomaniaDepartment of Chemistry, Faculty of Chemistry, “Alexandru Ioan Cuza” University of Iasi, Bvld. Carol I No 11, 700506 Iasi, RomaniaMixed 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.https://www.mdpi.com/1996-1944/13/21/4916lanthanummixed oxidesphotocatalytic performancephotocatalyst reusezinc |
| spellingShingle | Amalia Maria Sescu Maria Harja Lidia Favier Laurence Oughebbi Berthou Consuelo Gomez de Castro Aurel Pui Doina Lutic Zn/La Mixed Oxides Prepared by Coprecipitation: Synthesis, Characterization and Photocatalytic Studies Materials lanthanum mixed oxides photocatalytic performance photocatalyst reuse zinc |
| title | Zn/La Mixed Oxides Prepared by Coprecipitation: Synthesis, Characterization and Photocatalytic Studies |
| title_full | Zn/La Mixed Oxides Prepared by Coprecipitation: Synthesis, Characterization and Photocatalytic Studies |
| title_fullStr | Zn/La Mixed Oxides Prepared by Coprecipitation: Synthesis, Characterization and Photocatalytic Studies |
| title_full_unstemmed | Zn/La Mixed Oxides Prepared by Coprecipitation: Synthesis, Characterization and Photocatalytic Studies |
| title_short | Zn/La Mixed Oxides Prepared by Coprecipitation: Synthesis, Characterization and Photocatalytic Studies |
| title_sort | zn la mixed oxides prepared by coprecipitation synthesis characterization and photocatalytic studies |
| topic | lanthanum mixed oxides photocatalytic performance photocatalyst reuse zinc |
| url | https://www.mdpi.com/1996-1944/13/21/4916 |
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