Remarkable Recycling Process of ZnO Quantum Dots for Photodegradation of Reactive Yellow Dye and Solar Photocatalytic Treatment Process of Industrial Wastewater
The mineralization of five industrial sunlight-exposed wastewater samples was investigated, and the recycling process of ZnO quantum dots (ZQDs) for five reusable times was estimated under the approved Egyptian Environmental Law COD (Chemical Oxygen Demand), which has to be less than 1000 ppm. An im...
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| Format: | Article |
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MDPI AG
2022-07-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/15/2642 |
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| author | Walied Mohamed Hala Abd El-Gawad Hala Handal Hoda Galal Hanan Mousa Badr El-Sayed Saleh Mekkey Ibrahem Ibrahem Ammar Labib |
| author_facet | Walied Mohamed Hala Abd El-Gawad Hala Handal Hoda Galal Hanan Mousa Badr El-Sayed Saleh Mekkey Ibrahem Ibrahem Ammar Labib |
| author_sort | Walied Mohamed |
| collection | DOAJ |
| description | The mineralization of five industrial sunlight-exposed wastewater samples was investigated, and the recycling process of ZnO quantum dots (ZQDs) for five reusable times was estimated under the approved Egyptian Environmental Law COD (Chemical Oxygen Demand), which has to be less than 1000 ppm. An improved sol-gel process at a low calcination temperature that ranged between 350 and 450 °C was employed to synthesize ZnO quantum dots (ZQDs). The purity, high crystallinity, and structure of the prepared catalysts were determined by TEM and XRD analysis. The energy bandgap, the crystal size values, and the surface area for Z1 and Z2 were determined based on the TEMs, DRSs, and EBTs, which were equal to 6.9 nm, 3.49 eV, and 160.95 m<sup>2</sup>/g for Z1 and 8.3 nm, 3.44 eV, and 122.15 m<sup>2</sup>/g for Z2. The investigation of the prepared samples was carried out by studying the photocatalytic activity and photoluminescence, and it was found that the degradation rate of reactive yellow dye as an industrial pollutant of the Z1 sample was significantly higher than other samples, by 20%. The data collection has shown that photocatalytic efficiency decreases with an increase in the crystallite size of ZQDs. |
| first_indexed | 2024-03-09T05:07:46Z |
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| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T05:07:46Z |
| publishDate | 2022-07-01 |
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| series | Nanomaterials |
| spelling | doaj.art-1c90ae42eea9412bb1118e5a0060e02a2023-12-03T12:52:13ZengMDPI AGNanomaterials2079-49912022-07-011215264210.3390/nano12152642Remarkable Recycling Process of ZnO Quantum Dots for Photodegradation of Reactive Yellow Dye and Solar Photocatalytic Treatment Process of Industrial WastewaterWalied Mohamed0Hala Abd El-Gawad1Hala Handal2Hoda Galal3Hanan Mousa4Badr El-Sayed5Saleh Mekkey6Ibrahem Ibrahem7Ammar Labib8Photochemistry and Nanomaterials Lab, Inorganic Chemistry Department, National Research Centre, Cairo 12622, EgyptDepartment of Chemistry, Faculty of Science and Arts, King Khalid University, Mohail Assir, Abha 61421, Saudi ArabiaPhotochemistry and Nanomaterials Lab, Inorganic Chemistry Department, National Research Centre, Cairo 12622, EgyptPhotochemistry and Nanomaterials Lab, Inorganic Chemistry Department, National Research Centre, Cairo 12622, EgyptPhotochemistry and Nanomaterials Lab, Inorganic Chemistry Department, National Research Centre, Cairo 12622, EgyptInorganic Chemistry, Chemistry Department, Faculty of Science Al-Azhar University, Cairo 11884, EgyptInorganic Chemistry, Chemistry Department, Faculty of Science Al-Azhar University, Cairo 11884, EgyptInorganic Chemistry, Chemistry Department, Faculty of Science Al-Azhar University, Cairo 11884, EgyptPhotochemistry and Nanomaterials Lab, Inorganic Chemistry Department, National Research Centre, Cairo 12622, EgyptThe mineralization of five industrial sunlight-exposed wastewater samples was investigated, and the recycling process of ZnO quantum dots (ZQDs) for five reusable times was estimated under the approved Egyptian Environmental Law COD (Chemical Oxygen Demand), which has to be less than 1000 ppm. An improved sol-gel process at a low calcination temperature that ranged between 350 and 450 °C was employed to synthesize ZnO quantum dots (ZQDs). The purity, high crystallinity, and structure of the prepared catalysts were determined by TEM and XRD analysis. The energy bandgap, the crystal size values, and the surface area for Z1 and Z2 were determined based on the TEMs, DRSs, and EBTs, which were equal to 6.9 nm, 3.49 eV, and 160.95 m<sup>2</sup>/g for Z1 and 8.3 nm, 3.44 eV, and 122.15 m<sup>2</sup>/g for Z2. The investigation of the prepared samples was carried out by studying the photocatalytic activity and photoluminescence, and it was found that the degradation rate of reactive yellow dye as an industrial pollutant of the Z1 sample was significantly higher than other samples, by 20%. The data collection has shown that photocatalytic efficiency decreases with an increase in the crystallite size of ZQDs.https://www.mdpi.com/2079-4991/12/15/2642industrial wastewatersolar photocatalytic processrecycling processzinc oxide quantum dotsreactive yellow dye |
| spellingShingle | Walied Mohamed Hala Abd El-Gawad Hala Handal Hoda Galal Hanan Mousa Badr El-Sayed Saleh Mekkey Ibrahem Ibrahem Ammar Labib Remarkable Recycling Process of ZnO Quantum Dots for Photodegradation of Reactive Yellow Dye and Solar Photocatalytic Treatment Process of Industrial Wastewater Nanomaterials industrial wastewater solar photocatalytic process recycling process zinc oxide quantum dots reactive yellow dye |
| title | Remarkable Recycling Process of ZnO Quantum Dots for Photodegradation of Reactive Yellow Dye and Solar Photocatalytic Treatment Process of Industrial Wastewater |
| title_full | Remarkable Recycling Process of ZnO Quantum Dots for Photodegradation of Reactive Yellow Dye and Solar Photocatalytic Treatment Process of Industrial Wastewater |
| title_fullStr | Remarkable Recycling Process of ZnO Quantum Dots for Photodegradation of Reactive Yellow Dye and Solar Photocatalytic Treatment Process of Industrial Wastewater |
| title_full_unstemmed | Remarkable Recycling Process of ZnO Quantum Dots for Photodegradation of Reactive Yellow Dye and Solar Photocatalytic Treatment Process of Industrial Wastewater |
| title_short | Remarkable Recycling Process of ZnO Quantum Dots for Photodegradation of Reactive Yellow Dye and Solar Photocatalytic Treatment Process of Industrial Wastewater |
| title_sort | remarkable recycling process of zno quantum dots for photodegradation of reactive yellow dye and solar photocatalytic treatment process of industrial wastewater |
| topic | industrial wastewater solar photocatalytic process recycling process zinc oxide quantum dots reactive yellow dye |
| url | https://www.mdpi.com/2079-4991/12/15/2642 |
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