Gallium Oxides Photocatalysts Doped With Fe Ions for Discoloration of Rhodamine Under UV and Visible Light
Heterogeneous photocatalysis is a highly efficient process for degrading recalcitrant and emerging pollutants. Rhodamine B (RhB) is a nonbiodegradable and highly refractory compound persistent in conventional processes. In this work, we investigate the photocatalytic activity of gallium-based cataly...
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| Format: | Article |
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Frontiers Media S.A.
2022-05-01
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| Series: | Frontiers in Environmental Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fenvs.2022.884758/full |
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| author | S. Orozco M. Rivero E. Montiel J. Espino Valencia |
| author_facet | S. Orozco M. Rivero E. Montiel J. Espino Valencia |
| author_sort | S. Orozco |
| collection | DOAJ |
| description | Heterogeneous photocatalysis is a highly efficient process for degrading recalcitrant and emerging pollutants. Rhodamine B (RhB) is a nonbiodegradable and highly refractory compound persistent in conventional processes. In this work, we investigate the photocatalytic activity of gallium-based catalysts undoped (GO) and doped with Fe ions (GOFe). Catalysts were synthesized by simple precipitation assisted with an ultrasonic transducer and subjected to thermal treatment at different temperatures (500, 650, 800 and 950°C). They were characterized by thermogravimetric analysis (TGA), Fourier transform infrared (ATR-FTIR) spectroscopy, and X-ray diffraction (XRD). Catalysts were tested in the discoloration of Rhodamine B dye. Experiments were carried out at different pH values (3.00, 5.00 and 9.00) in the presence of H2O2 and using Visible and Visible-UV light sources as study variables. Better discoloration results were observed for GO and GOFe under acid environments (pH = 3.00) for both light sources. GO and GOFe photocatalyst showed high effectiveness in the discoloration of RhB completing the process in 300 min, under a Visible-UV lamp at pH = 3.00. Incorporating Fe ions into the gallium oxides matrix decreases its bandgap, allowing it to activate under visible light. The discoloration process exhibited pseudo-zero-order apparent kinetics. |
| first_indexed | 2024-04-14T05:03:52Z |
| format | Article |
| id | doaj.art-9e68848ae60840a2b469aa6880d3f4d7 |
| institution | Directory Open Access Journal |
| issn | 2296-665X |
| language | English |
| last_indexed | 2024-04-14T05:03:52Z |
| publishDate | 2022-05-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Environmental Science |
| spelling | doaj.art-9e68848ae60840a2b469aa6880d3f4d72022-12-22T02:10:50ZengFrontiers Media S.A.Frontiers in Environmental Science2296-665X2022-05-011010.3389/fenvs.2022.884758884758Gallium Oxides Photocatalysts Doped With Fe Ions for Discoloration of Rhodamine Under UV and Visible LightS. Orozco0M. Rivero1E. Montiel2J. Espino Valencia3Posgrado de Ingeniería Química, Universidad Michoacana de San Nicolás de Hidalgo, Edif V1, Ciudad Universitaria, Morelia, MexicoInstituto de Investigaciones en Materiales, Unidad Morelia, Universidad Nacional Autónoma de México, Morelia, MexicoEscuela de Estudios Superiores de Xalostoc, Universidad Autónoma del Estado de Morelos, Morelia, MexicoPosgrado de Ingeniería Química, Universidad Michoacana de San Nicolás de Hidalgo, Edif V1, Ciudad Universitaria, Morelia, MexicoHeterogeneous photocatalysis is a highly efficient process for degrading recalcitrant and emerging pollutants. Rhodamine B (RhB) is a nonbiodegradable and highly refractory compound persistent in conventional processes. In this work, we investigate the photocatalytic activity of gallium-based catalysts undoped (GO) and doped with Fe ions (GOFe). Catalysts were synthesized by simple precipitation assisted with an ultrasonic transducer and subjected to thermal treatment at different temperatures (500, 650, 800 and 950°C). They were characterized by thermogravimetric analysis (TGA), Fourier transform infrared (ATR-FTIR) spectroscopy, and X-ray diffraction (XRD). Catalysts were tested in the discoloration of Rhodamine B dye. Experiments were carried out at different pH values (3.00, 5.00 and 9.00) in the presence of H2O2 and using Visible and Visible-UV light sources as study variables. Better discoloration results were observed for GO and GOFe under acid environments (pH = 3.00) for both light sources. GO and GOFe photocatalyst showed high effectiveness in the discoloration of RhB completing the process in 300 min, under a Visible-UV lamp at pH = 3.00. Incorporating Fe ions into the gallium oxides matrix decreases its bandgap, allowing it to activate under visible light. The discoloration process exhibited pseudo-zero-order apparent kinetics.https://www.frontiersin.org/articles/10.3389/fenvs.2022.884758/fullphotocatalysisgallium oxidesgo and gofe photocatalystsphotodegradationrhodaminevisible-UV illumination |
| spellingShingle | S. Orozco M. Rivero E. Montiel J. Espino Valencia Gallium Oxides Photocatalysts Doped With Fe Ions for Discoloration of Rhodamine Under UV and Visible Light Frontiers in Environmental Science photocatalysis gallium oxides go and gofe photocatalysts photodegradation rhodamine visible-UV illumination |
| title | Gallium Oxides Photocatalysts Doped With Fe Ions for Discoloration of Rhodamine Under UV and Visible Light |
| title_full | Gallium Oxides Photocatalysts Doped With Fe Ions for Discoloration of Rhodamine Under UV and Visible Light |
| title_fullStr | Gallium Oxides Photocatalysts Doped With Fe Ions for Discoloration of Rhodamine Under UV and Visible Light |
| title_full_unstemmed | Gallium Oxides Photocatalysts Doped With Fe Ions for Discoloration of Rhodamine Under UV and Visible Light |
| title_short | Gallium Oxides Photocatalysts Doped With Fe Ions for Discoloration of Rhodamine Under UV and Visible Light |
| title_sort | gallium oxides photocatalysts doped with fe ions for discoloration of rhodamine under uv and visible light |
| topic | photocatalysis gallium oxides go and gofe photocatalysts photodegradation rhodamine visible-UV illumination |
| url | https://www.frontiersin.org/articles/10.3389/fenvs.2022.884758/full |
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