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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| creator | Sescu, Amalia Maria Harja, Maria Favier, Lidia Berthou, Laurence Oughebbi Gomez de Castro, Consuelo Pui, Aurel Lutic, Doina |
| 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. |
| doi_str_mv | 10.3390/ma13214916 |
| format | Article |
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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.</description><identifier>ISSN: 1996-1944</identifier><identifier>EISSN: 1996-1944</identifier><identifier>DOI: 10.3390/ma13214916</identifier><identifier>PMID: 33142946</identifier><language>eng</language><publisher>Switzerland: MDPI AG</publisher><subject>Adsorption ; Aqueous solutions ; Catalysis ; Chemical Sciences ; Coprecipitation ; Degradation ; Electron probe microanalysis ; High performance liquid chromatography ; Infrared spectroscopy ; Lanthanum ; Low concentrations ; Material chemistry ; Mineralization ; Mixed oxides ; Morphology ; Organic carbon ; Pesticides ; Photocatalysis ; Pollutants ; Roasting ; Spectrum analysis ; Ultraviolet reflection ; Zinc ; Zinc oxides</subject><ispartof>Materials, 2020-10, Vol.13 (21), p.4916</ispartof><rights>2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). 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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.</description><subject>Adsorption</subject><subject>Aqueous solutions</subject><subject>Catalysis</subject><subject>Chemical Sciences</subject><subject>Coprecipitation</subject><subject>Degradation</subject><subject>Electron probe microanalysis</subject><subject>High performance liquid chromatography</subject><subject>Infrared spectroscopy</subject><subject>Lanthanum</subject><subject>Low concentrations</subject><subject>Material chemistry</subject><subject>Mineralization</subject><subject>Mixed oxides</subject><subject>Morphology</subject><subject>Organic carbon</subject><subject>Pesticides</subject><subject>Photocatalysis</subject><subject>Pollutants</subject><subject>Roasting</subject><subject>Spectrum analysis</subject><subject>Ultraviolet reflection</subject><subject>Zinc</subject><subject>Zinc oxides</subject><issn>1996-1944</issn><issn>1996-1944</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNpdkU1P3DAQhq2KqiDKpT8AWeIE6hZ_xfFwQEKr8iFtBRLtpRfLsR1itBsH24tYfj2BpZR2Lp7xPPPaoxehL5R84xzI4cJQzqgAKj-gLQogJxSE2HiXb6KdnG_JGJxTxeAT2hwTwUDILdT-7g9nBv8ID97hy4fgfMZXyQ8mjXWzwtM4JG_DEIopIfZH-HrVl87nkL_iaWeSscWn8PjSxKZ3-KqLJVpTzHxVgsXXZemCz5_Rx9bMs995PbfRr9PvP6fnk9nl2cX0ZDaxQpAycZUSkrrG86bihhlPJGNQSWlNKxRI4AaamjDX1LZVzhOqKmikFc5TcI3g2-h4rTssm4V31vclmbkeUliYtNLRBP1vpw-dvon3upaS81qOAvtrge6_sfOTmX6-IwxAgZL3dGT3Xh9L8W7pc9G3cZn6cT_NKqEUB1GTkTpYUzbFnJNv32Qp0c8W6r8WjvDu-_-_oX8M408AH5df</recordid><startdate>20201031</startdate><enddate>20201031</enddate><creator>Sescu, Amalia Maria</creator><creator>Harja, Maria</creator><creator>Favier, Lidia</creator><creator>Berthou, Laurence Oughebbi</creator><creator>Gomez de Castro, Consuelo</creator><creator>Pui, Aurel</creator><creator>Lutic, Doina</creator><general>MDPI AG</general><general>MDPI</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>JG9</scope><scope>KB.</scope><scope>PDBOC</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>1XC</scope><scope>VOOES</scope><scope>5PM</scope><orcidid>https://orcid.org/0000-0002-7864-0062</orcidid><orcidid>https://orcid.org/0000-0002-3959-0891</orcidid><orcidid>https://orcid.org/0000-0003-0152-0748</orcidid></search><sort><creationdate>20201031</creationdate><title>Zn/La Mixed Oxides Prepared by Coprecipitation: Synthesis, Characterization and Photocatalytic Studies</title><author>Sescu, Amalia Maria ; Harja, Maria ; Favier, Lidia ; Berthou, Laurence Oughebbi ; Gomez de Castro, Consuelo ; Pui, Aurel ; Lutic, Doina</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c440t-d58461dbe3b53a2ae06229566caf489693a9b702db7cf8de01859b6c4de19db43</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Adsorption</topic><topic>Aqueous solutions</topic><topic>Catalysis</topic><topic>Chemical Sciences</topic><topic>Coprecipitation</topic><topic>Degradation</topic><topic>Electron probe microanalysis</topic><topic>High performance liquid chromatography</topic><topic>Infrared spectroscopy</topic><topic>Lanthanum</topic><topic>Low concentrations</topic><topic>Material chemistry</topic><topic>Mineralization</topic><topic>Mixed oxides</topic><topic>Morphology</topic><topic>Organic carbon</topic><topic>Pesticides</topic><topic>Photocatalysis</topic><topic>Pollutants</topic><topic>Roasting</topic><topic>Spectrum analysis</topic><topic>Ultraviolet reflection</topic><topic>Zinc</topic><topic>Zinc oxides</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sescu, Amalia Maria</creatorcontrib><creatorcontrib>Harja, Maria</creatorcontrib><creatorcontrib>Favier, Lidia</creatorcontrib><creatorcontrib>Berthou, Laurence Oughebbi</creatorcontrib><creatorcontrib>Gomez de Castro, Consuelo</creatorcontrib><creatorcontrib>Pui, Aurel</creatorcontrib><creatorcontrib>Lutic, Doina</creatorcontrib><collection>PubMed</collection><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Materials Science Collection</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>Materials Research Database</collection><collection>Materials Science Database</collection><collection>Materials Science Collection</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><collection>PubMed Central (Full Participant titles)</collection><jtitle>Materials</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sescu, Amalia Maria</au><au>Harja, Maria</au><au>Favier, Lidia</au><au>Berthou, Laurence Oughebbi</au><au>Gomez de Castro, Consuelo</au><au>Pui, Aurel</au><au>Lutic, Doina</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Zn/La Mixed Oxides Prepared by Coprecipitation: Synthesis, Characterization and Photocatalytic Studies</atitle><jtitle>Materials</jtitle><addtitle>Materials (Basel)</addtitle><date>2020-10-31</date><risdate>2020</risdate><volume>13</volume><issue>21</issue><spage>4916</spage><pages>4916-</pages><issn>1996-1944</issn><eissn>1996-1944</eissn><abstract>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.</abstract><cop>Switzerland</cop><pub>MDPI AG</pub><pmid>33142946</pmid><doi>10.3390/ma13214916</doi><orcidid>https://orcid.org/0000-0002-7864-0062</orcidid><orcidid>https://orcid.org/0000-0002-3959-0891</orcidid><orcidid>https://orcid.org/0000-0003-0152-0748</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Adsorption Aqueous solutions Catalysis Chemical Sciences Coprecipitation Degradation Electron probe microanalysis High performance liquid chromatography Infrared spectroscopy Lanthanum Low concentrations Material chemistry Mineralization Mixed oxides Morphology Organic carbon Pesticides Photocatalysis Pollutants Roasting Spectrum analysis Ultraviolet reflection Zinc Zinc oxides |
| title | Zn/La Mixed Oxides Prepared by Coprecipitation: Synthesis, Characterization and Photocatalytic Studies |
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