Eco-friendly fabrication of ZnO-TiO2-rGO nanocomposite for efficient adsorption-assisted organic dyes elimination
The growing interest in combining the photocatalytic properties of semiconductors like ZnO and TiO2 with the superior electron conduction capabilities of graphene has resulted in the successful synthesis of in-situ reduced graphene oxide (rGO) supported ZnO-TiO2 nanostructures through a simple micro...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-12-01
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| Series: | Open Ceramics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S266653952400155X |
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| author | Md Elias Ehsanur Rahman Sonia Akter Mohammad Awlad Hossain Rumana A. Jahan Md Nizam Uddin Shakhawat H. Firoz |
| author_facet | Md Elias Ehsanur Rahman Sonia Akter Mohammad Awlad Hossain Rumana A. Jahan Md Nizam Uddin Shakhawat H. Firoz |
| author_sort | Md Elias |
| collection | DOAJ |
| description | The growing interest in combining the photocatalytic properties of semiconductors like ZnO and TiO2 with the superior electron conduction capabilities of graphene has resulted in the successful synthesis of in-situ reduced graphene oxide (rGO) supported ZnO-TiO2 nanostructures through a simple microwave-assisted synthesis method. X-ray Diffraction Spectroscopy (XRD), Field Emission Scanning Electron Microscope (FESEM), UV–visible spectroscopy (UV–vis), and Fourier Transform Infrared Spectroscopy (FTIR) were employed to characterize structural, morphological and optical properties as well as surface functional groups of the synthesized products. The XRD measurements of our synthesized samples confirm both structural crystallinity and phase purity, while the FTIR analysis verifies the complete reduction of graphene oxide (GO) to reduced graphene oxide (rGO). The synthesized ternary nanocomposite ZnO-TiO2-rGO exhibited a remarkable 100 % adsorption-assisted removal efficiency for 20 mg/L methylene blue (MB) dye under ultraviolet light illumination within 120 min, along with a 56 % dye adsorption removal efficiency in the same time interval. In comparison, pure ZnO showed 0 % adsorption and only 31 % photocatalytic efficiency at the similar condition. Remarkably, the ZnO-TiO2-rGO nanocomposite exhibited exceptional photocatalytic activity mediated by adsorption, achieving complete degradation of MB dye within 5 min under sunlight irradiation. The photocatalytic efficiency and dye adsorption capacity were found to be significantly lower for the anionic dye methyl orange (MO) compared to the cationic MB dye. The study thoroughly investigated the influence of catalyst dose and initial dye concentration on photodegradation. The proposed mechanism indicates that the extensive surface area and numerous active sites on the rGO promote adsorption, which is then followed by degradation through the metal oxides. Overall, the results unveil that the microwave-assisted synthesis of ZnO-TiO2-rGO nanocomposite is a promising and environmentally friendly approach for efficiently degrading dyes from contaminated wastewater using both UV light and natural sunlight irradiation. |
| format | Article |
| id | doaj-art-035fd7dea869432eb5fb45c2d9e0eac2 |
| institution | OA Journals |
| issn | 2666-5395 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Open Ceramics |
| spelling | doaj-art-035fd7dea869432eb5fb45c2d9e0eac22025-08-20T02:30:55ZengElsevierOpen Ceramics2666-53952024-12-012010069110.1016/j.oceram.2024.100691Eco-friendly fabrication of ZnO-TiO2-rGO nanocomposite for efficient adsorption-assisted organic dyes eliminationMd Elias0Ehsanur Rahman1Sonia Akter2Mohammad Awlad Hossain3Rumana A. Jahan4Md Nizam Uddin5Shakhawat H. Firoz6Department of Chemistry, Bangladesh University of Engineering and Technology, Dhaka, 1000, Bangladesh; Department of Chemistry, Jagannath University, Dhaka, 1100, Bangladesh; Corresponding author. Department of Chemistry, Jagannath University, Dhaka, 1100, Bangladesh.Department of Chemical Engineering, Bangladesh University of Engineering and Technology, Dhaka, 1000, BangladeshDepartment of Chemistry, Shahjalal University of Science and Technology, Sylhet, 3114, BangladeshDepartment of Chemistry, Jagannath University, Dhaka, 1100, BangladeshCenter for Advanced Research in Sciences, University of Dhaka, Dhaka, 1000, BangladeshDepartment of Chemistry, Shahjalal University of Science and Technology, Sylhet, 3114, BangladeshDepartment of Chemistry, Bangladesh University of Engineering and Technology, Dhaka, 1000, Bangladesh; Corresponding author. Department of Chemistry, Bangladesh University of Engineering and Technology, Dhaka, 1000, Bangladesh.The growing interest in combining the photocatalytic properties of semiconductors like ZnO and TiO2 with the superior electron conduction capabilities of graphene has resulted in the successful synthesis of in-situ reduced graphene oxide (rGO) supported ZnO-TiO2 nanostructures through a simple microwave-assisted synthesis method. X-ray Diffraction Spectroscopy (XRD), Field Emission Scanning Electron Microscope (FESEM), UV–visible spectroscopy (UV–vis), and Fourier Transform Infrared Spectroscopy (FTIR) were employed to characterize structural, morphological and optical properties as well as surface functional groups of the synthesized products. The XRD measurements of our synthesized samples confirm both structural crystallinity and phase purity, while the FTIR analysis verifies the complete reduction of graphene oxide (GO) to reduced graphene oxide (rGO). The synthesized ternary nanocomposite ZnO-TiO2-rGO exhibited a remarkable 100 % adsorption-assisted removal efficiency for 20 mg/L methylene blue (MB) dye under ultraviolet light illumination within 120 min, along with a 56 % dye adsorption removal efficiency in the same time interval. In comparison, pure ZnO showed 0 % adsorption and only 31 % photocatalytic efficiency at the similar condition. Remarkably, the ZnO-TiO2-rGO nanocomposite exhibited exceptional photocatalytic activity mediated by adsorption, achieving complete degradation of MB dye within 5 min under sunlight irradiation. The photocatalytic efficiency and dye adsorption capacity were found to be significantly lower for the anionic dye methyl orange (MO) compared to the cationic MB dye. The study thoroughly investigated the influence of catalyst dose and initial dye concentration on photodegradation. The proposed mechanism indicates that the extensive surface area and numerous active sites on the rGO promote adsorption, which is then followed by degradation through the metal oxides. Overall, the results unveil that the microwave-assisted synthesis of ZnO-TiO2-rGO nanocomposite is a promising and environmentally friendly approach for efficiently degrading dyes from contaminated wastewater using both UV light and natural sunlight irradiation.http://www.sciencedirect.com/science/article/pii/S266653952400155XMicrowave processingCompositesOptical propertiesOrganic dyesPhotodegradation |
| spellingShingle | Md Elias Ehsanur Rahman Sonia Akter Mohammad Awlad Hossain Rumana A. Jahan Md Nizam Uddin Shakhawat H. Firoz Eco-friendly fabrication of ZnO-TiO2-rGO nanocomposite for efficient adsorption-assisted organic dyes elimination Open Ceramics Microwave processing Composites Optical properties Organic dyes Photodegradation |
| title | Eco-friendly fabrication of ZnO-TiO2-rGO nanocomposite for efficient adsorption-assisted organic dyes elimination |
| title_full | Eco-friendly fabrication of ZnO-TiO2-rGO nanocomposite for efficient adsorption-assisted organic dyes elimination |
| title_fullStr | Eco-friendly fabrication of ZnO-TiO2-rGO nanocomposite for efficient adsorption-assisted organic dyes elimination |
| title_full_unstemmed | Eco-friendly fabrication of ZnO-TiO2-rGO nanocomposite for efficient adsorption-assisted organic dyes elimination |
| title_short | Eco-friendly fabrication of ZnO-TiO2-rGO nanocomposite for efficient adsorption-assisted organic dyes elimination |
| title_sort | eco friendly fabrication of zno tio2 rgo nanocomposite for efficient adsorption assisted organic dyes elimination |
| topic | Microwave processing Composites Optical properties Organic dyes Photodegradation |
| url | http://www.sciencedirect.com/science/article/pii/S266653952400155X |
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