Green synthesis and enhanced photocatalytic performance of Co-Doped CuO nanoparticles for efficient degradation of synthetic dyes and water splitting
A highly effective Co-doped CuO photocatalyst was fabricated using a one-pot green synthetic route for photocatalytic decomposition of methylene blue (MB). The synthesized materials were confirmed using Field emission-scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), Thermogravimetric ...
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Elsevier
2025-01-01
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| Series: | Results in Chemistry |
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| author | Daniel Masekela Lovedonia K. Kganyakgo Kwena D. Modibane Tunde L. Yusuf Sheriff A. Balogun Wilson M. Seleka Edwin Makhado |
| author_facet | Daniel Masekela Lovedonia K. Kganyakgo Kwena D. Modibane Tunde L. Yusuf Sheriff A. Balogun Wilson M. Seleka Edwin Makhado |
| author_sort | Daniel Masekela |
| collection | DOAJ |
| description | A highly effective Co-doped CuO photocatalyst was fabricated using a one-pot green synthetic route for photocatalytic decomposition of methylene blue (MB). The synthesized materials were confirmed using Field emission-scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), Thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FTIR). The optical and electrochemical properties, including the energy band gap, transient photocurrent response (TPR), and charge-transfer resistance (Rct), were assessed using chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS), respectively. The results from TPR, and EIS revealed that cobalt doping effectively promotes the separation of photogenerated charge carrier’s, diminishing recombination and thereby improving photocatalytic activity. The evaluation of photocatalytic activity revealed that the fabricated Co-doped CuO nanoparticles (NPs) demonstrated excellent photocatalytic activity compared to pure CuO NPs. Under UV–vis light irradiation, Co-doped CuO NPs achieved photocatalytic degradation efficiency of about 88 % within 100 min, whereas for pristine CuO NPs it was 75 % under the same irradiation time. The highest degradation efficiency achieved by Co-doped CuO NPs was ascribed to their improved electron and hole separation. Moreover, the scavenger experiment showed that the primary active species responsible for the photocatalytic decomposition of MB were hydroxyl radicals (•OH) and holes (h+), followed by electrons (e-) and superoxide radicals (•O2–). The developed Co-doped CuO photocatalyst was highly stable even after 5th cycle. Additionally, the results demonstrated that the Co-doped CuO nanocomposite displayed a significantly higher water-splitting activity. This study offers a valuable reference for metal doping in photocatalyst semiconductors for effective photocatalytic removal of organic contaminants and hydrogen production. |
| format | Article |
| id | doaj-art-86628b5586574856a57908b34740ead1 |
| institution | Kabale University |
| issn | 2211-7156 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Chemistry |
| spelling | doaj-art-86628b5586574856a57908b34740ead12025-01-29T05:00:45ZengElsevierResults in Chemistry2211-71562025-01-0113101971Green synthesis and enhanced photocatalytic performance of Co-Doped CuO nanoparticles for efficient degradation of synthetic dyes and water splittingDaniel Masekela0Lovedonia K. Kganyakgo1Kwena D. Modibane2Tunde L. Yusuf3Sheriff A. Balogun4Wilson M. Seleka5Edwin Makhado6Department of Chemistry, University of Limpopo, Sovenga, Polokwane 0727, South Africa; Corresponding authors.Department of Chemistry, University of Limpopo, Sovenga, Polokwane 0727, South AfricaDepartment of Chemistry, University of Limpopo, Sovenga, Polokwane 0727, South Africa; DSI-NRF SARChI Chair in Photocatalytic Hydrogen Production, Department of Chemistry, School of Physical and Mineral Sciences, University of Limpopo (Turfloop), Polokwane, Sovenga 0727, South AfricaDepartment of Chemistry, Faculty of Natural and Agricultural Sciences, University of Pretoria, Private Bag X20, Hatfield 0028, Pretoria, South AfricaDepartment of Chemistry, University of Limpopo, Sovenga, Polokwane 0727, South AfricaDepartment of Chemistry, University of Limpopo, Sovenga, Polokwane 0727, South AfricaDepartment of Chemistry, University of Limpopo, Sovenga, Polokwane 0727, South Africa; Corresponding authors.A highly effective Co-doped CuO photocatalyst was fabricated using a one-pot green synthetic route for photocatalytic decomposition of methylene blue (MB). The synthesized materials were confirmed using Field emission-scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), Thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FTIR). The optical and electrochemical properties, including the energy band gap, transient photocurrent response (TPR), and charge-transfer resistance (Rct), were assessed using chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS), respectively. The results from TPR, and EIS revealed that cobalt doping effectively promotes the separation of photogenerated charge carrier’s, diminishing recombination and thereby improving photocatalytic activity. The evaluation of photocatalytic activity revealed that the fabricated Co-doped CuO nanoparticles (NPs) demonstrated excellent photocatalytic activity compared to pure CuO NPs. Under UV–vis light irradiation, Co-doped CuO NPs achieved photocatalytic degradation efficiency of about 88 % within 100 min, whereas for pristine CuO NPs it was 75 % under the same irradiation time. The highest degradation efficiency achieved by Co-doped CuO NPs was ascribed to their improved electron and hole separation. Moreover, the scavenger experiment showed that the primary active species responsible for the photocatalytic decomposition of MB were hydroxyl radicals (•OH) and holes (h+), followed by electrons (e-) and superoxide radicals (•O2–). The developed Co-doped CuO photocatalyst was highly stable even after 5th cycle. Additionally, the results demonstrated that the Co-doped CuO nanocomposite displayed a significantly higher water-splitting activity. This study offers a valuable reference for metal doping in photocatalyst semiconductors for effective photocatalytic removal of organic contaminants and hydrogen production.http://www.sciencedirect.com/science/article/pii/S2211715624006672CuO nanoparticles (NPs)Co-dopingPhotocatalytic degradationPhotocatalytic water splittingOrganic dyes |
| spellingShingle | Daniel Masekela Lovedonia K. Kganyakgo Kwena D. Modibane Tunde L. Yusuf Sheriff A. Balogun Wilson M. Seleka Edwin Makhado Green synthesis and enhanced photocatalytic performance of Co-Doped CuO nanoparticles for efficient degradation of synthetic dyes and water splitting Results in Chemistry CuO nanoparticles (NPs) Co-doping Photocatalytic degradation Photocatalytic water splitting Organic dyes |
| title | Green synthesis and enhanced photocatalytic performance of Co-Doped CuO nanoparticles for efficient degradation of synthetic dyes and water splitting |
| title_full | Green synthesis and enhanced photocatalytic performance of Co-Doped CuO nanoparticles for efficient degradation of synthetic dyes and water splitting |
| title_fullStr | Green synthesis and enhanced photocatalytic performance of Co-Doped CuO nanoparticles for efficient degradation of synthetic dyes and water splitting |
| title_full_unstemmed | Green synthesis and enhanced photocatalytic performance of Co-Doped CuO nanoparticles for efficient degradation of synthetic dyes and water splitting |
| title_short | Green synthesis and enhanced photocatalytic performance of Co-Doped CuO nanoparticles for efficient degradation of synthetic dyes and water splitting |
| title_sort | green synthesis and enhanced photocatalytic performance of co doped cuo nanoparticles for efficient degradation of synthetic dyes and water splitting |
| topic | CuO nanoparticles (NPs) Co-doping Photocatalytic degradation Photocatalytic water splitting Organic dyes |
| url | http://www.sciencedirect.com/science/article/pii/S2211715624006672 |
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