Fabrication of (Ni, S)-Codoped ZnO Nanophotocatalysts as Efficient Solar-Light Driven Photocatalysts for the Degradation of Organic Azo Dyes in Aqueous Media
In this study, a visible-light-active undoped ZnO and (Ni, S)-codoped ZnO photocatalyst was synthesized in nano form using the co-precipitation method with ZnSO₄•7H₂O as a precursor. The structural and morphological properties of the synthesized photocatalyst were analyzed through spectroscopic meth...
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Iranian Environmental Mutagen Society
2025-05-01
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| Series: | Journal of Water and Environmental Nanotechnology |
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| Online Access: | https://www.jwent.net/article_724949_57bb16cde22f52e4fdb9fe242fa5f3b9.pdf |
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| author | D. Sonia E K Kirupa |
| author_facet | D. Sonia E K Kirupa |
| author_sort | D. Sonia |
| collection | DOAJ |
| description | In this study, a visible-light-active undoped ZnO and (Ni, S)-codoped ZnO photocatalyst was synthesized in nano form using the co-precipitation method with ZnSO₄•7H₂O as a precursor. The structural and morphological properties of the synthesized photocatalyst were analyzed through spectroscopic methods, including XRD, FT-IR, SEM-EDAX, TEM, and UV-DRS analyses. The photocatalytic activity of the synthesized materials was tested on an azo dye, Direct Red-81 and its degradation efficiency was evaluated. The results revealed that 100% of Direct Red-81 azo dye was degraded using (Ni, S)-codoped ZnO photocatalysts (0.1 g/100 mL) under visible light irradiation within 20 minutes. Moreover, 99% mineralization was confirmed using COD and TOC analyses. The reaction rate followed pseudo-first-order kinetics with a rate constant of 0.064 × 10⁻³ min⁻¹. Furthermore, the photocatalysts demonstrated reusability and were effective for eight consecutive cycles without any loss in efficiency. These findings illustrate the enhanced photocatalytic activity of the (Ni, S)-codoped ZnO photocatalyst, which is attributed to the reduced rate of electron-hole recombination reactions. Additionally, the synthesized nanoparticles were eco-friendly, stable, and well-organized, making them suitable for the treatment of industrial and agricultural wastewater containing organic contaminants in relatively shorter periods under sunlight irradiation. Hence, the synthesized (Ni, S)-codoped ZnO photocatalyst serves as a significant tool for the treatment of effluents in various environmental applications. |
| format | Article |
| id | doaj-art-2cb7d7cb31004f4babaa51eaeddfd59a |
| institution | DOAJ |
| issn | 2476-7204 2476-6615 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Iranian Environmental Mutagen Society |
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| series | Journal of Water and Environmental Nanotechnology |
| spelling | doaj-art-2cb7d7cb31004f4babaa51eaeddfd59a2025-08-20T03:07:14ZengIranian Environmental Mutagen SocietyJournal of Water and Environmental Nanotechnology2476-72042476-66152025-05-0110218419910.22090/jwent.2025.02.007724949Fabrication of (Ni, S)-Codoped ZnO Nanophotocatalysts as Efficient Solar-Light Driven Photocatalysts for the Degradation of Organic Azo Dyes in Aqueous MediaD. Sonia0E K Kirupa1esearch Scholar (Reg no: 20123112032018), Department of Chemistry & Research Centre, Nesamony Memorial Christian College, Marthandam-629165(Affiliated to Manonmaniam Sundaranar University, Abishekapatti, Tirunelveli), Tamil Nadu, IndiaAssistant Professor, Department of Chemistry & Research Centre, Nesamony Memorial Christian College, Marthandam-629165(Affiliated to Manonmaniam Sundaranar University, Abishekapatti, Tirunelveli), Tamilnadu, IndiaIn this study, a visible-light-active undoped ZnO and (Ni, S)-codoped ZnO photocatalyst was synthesized in nano form using the co-precipitation method with ZnSO₄•7H₂O as a precursor. The structural and morphological properties of the synthesized photocatalyst were analyzed through spectroscopic methods, including XRD, FT-IR, SEM-EDAX, TEM, and UV-DRS analyses. The photocatalytic activity of the synthesized materials was tested on an azo dye, Direct Red-81 and its degradation efficiency was evaluated. The results revealed that 100% of Direct Red-81 azo dye was degraded using (Ni, S)-codoped ZnO photocatalysts (0.1 g/100 mL) under visible light irradiation within 20 minutes. Moreover, 99% mineralization was confirmed using COD and TOC analyses. The reaction rate followed pseudo-first-order kinetics with a rate constant of 0.064 × 10⁻³ min⁻¹. Furthermore, the photocatalysts demonstrated reusability and were effective for eight consecutive cycles without any loss in efficiency. These findings illustrate the enhanced photocatalytic activity of the (Ni, S)-codoped ZnO photocatalyst, which is attributed to the reduced rate of electron-hole recombination reactions. Additionally, the synthesized nanoparticles were eco-friendly, stable, and well-organized, making them suitable for the treatment of industrial and agricultural wastewater containing organic contaminants in relatively shorter periods under sunlight irradiation. Hence, the synthesized (Ni, S)-codoped ZnO photocatalyst serves as a significant tool for the treatment of effluents in various environmental applications.https://www.jwent.net/article_724949_57bb16cde22f52e4fdb9fe242fa5f3b9.pdfphotodegradationvisible lightdirect red 81pollutantmineralisation |
| spellingShingle | D. Sonia E K Kirupa Fabrication of (Ni, S)-Codoped ZnO Nanophotocatalysts as Efficient Solar-Light Driven Photocatalysts for the Degradation of Organic Azo Dyes in Aqueous Media Journal of Water and Environmental Nanotechnology photodegradation visible light direct red 81 pollutant mineralisation |
| title | Fabrication of (Ni, S)-Codoped ZnO Nanophotocatalysts as Efficient Solar-Light Driven Photocatalysts for the Degradation of Organic Azo Dyes in Aqueous Media |
| title_full | Fabrication of (Ni, S)-Codoped ZnO Nanophotocatalysts as Efficient Solar-Light Driven Photocatalysts for the Degradation of Organic Azo Dyes in Aqueous Media |
| title_fullStr | Fabrication of (Ni, S)-Codoped ZnO Nanophotocatalysts as Efficient Solar-Light Driven Photocatalysts for the Degradation of Organic Azo Dyes in Aqueous Media |
| title_full_unstemmed | Fabrication of (Ni, S)-Codoped ZnO Nanophotocatalysts as Efficient Solar-Light Driven Photocatalysts for the Degradation of Organic Azo Dyes in Aqueous Media |
| title_short | Fabrication of (Ni, S)-Codoped ZnO Nanophotocatalysts as Efficient Solar-Light Driven Photocatalysts for the Degradation of Organic Azo Dyes in Aqueous Media |
| title_sort | fabrication of ni s codoped zno nanophotocatalysts as efficient solar light driven photocatalysts for the degradation of organic azo dyes in aqueous media |
| topic | photodegradation visible light direct red 81 pollutant mineralisation |
| url | https://www.jwent.net/article_724949_57bb16cde22f52e4fdb9fe242fa5f3b9.pdf |
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