Bio-inspired synthesis of Co-doped CuO/ZnO nanocomposites for enhanced photocatalytic degradation of methyl blue
Environmental pollution by organic dyes poses a significant global threat, necessitating sustainable remediation techniques. This study reports the green synthesis of a novel cobalt-doped CuO/ZnO nanocomposite using Hagenia abyssinica leaf extract as a bioreducing and capping agent, offering an eco-...
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Elsevier
2025-07-01
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| Series: | Results in Chemistry |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211715625005181 |
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| author | Samrawit Mekonen Yimer Ashenafi Zeleke Melaku |
| author_facet | Samrawit Mekonen Yimer Ashenafi Zeleke Melaku |
| author_sort | Samrawit Mekonen Yimer |
| collection | DOAJ |
| description | Environmental pollution by organic dyes poses a significant global threat, necessitating sustainable remediation techniques. This study reports the green synthesis of a novel cobalt-doped CuO/ZnO nanocomposite using Hagenia abyssinica leaf extract as a bioreducing and capping agent, offering an eco-friendly alternative to traditional methods. The synthesized nanocomposite was characterized by XRD, FTIR, SEM-EDX, and UV–Vis DRS. XRD confirmed the successful formation of Co-doped CuO/ZnO with distinct peaks indicating cobalt incorporation and enhanced crystallinity. Confirmation of cobalt integration into the CuO/ZnO nanocomposite is provided by two key observations: a new peak appearing around 31∘, and shifts in the peak positions at both 29.4∘ and 31.7∘. These changes also point to an alteration in the crystallinity of the material. Additionally, the distinctive metal (Co, Cu, Zn)‑oxygen stretching peaks are visible in the FT-IR spectrum between 500 and 900 nm wavelengths. FTIR analysis verified the role of phytochemicals in stabilization, while SEM-EDX result revealed uniformly distributed elements of nanoparticles. Optical properties from UV–Vis DRS spectrum showed that cobalt doping effectively reduced the bandgap of CuO/ZnO, enabling efficient sunlight absorption. Photocatalytic degradation tests demonstrated that the Co-doped CuO/ZnO nanocomposite significantly enhanced the degradation of methyl blue dye. Notably 2 mg of 0.05 %Co-5 %CuO/ZnO exhibited superior activity (93.82 % degradation of 10 mg MB in 80 min) compared to pristine ZnO (57.2 %), attributed to reduced electron-hole recombination and optimized bandgap. This bio-mediated approach offers a promising, sustainable solution for industrial wastewater treatment. |
| format | Article |
| id | doaj-art-ded8de0e62f345b8b7941a79e39be4d3 |
| institution | DOAJ |
| issn | 2211-7156 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Chemistry |
| spelling | doaj-art-ded8de0e62f345b8b7941a79e39be4d32025-08-20T03:23:22ZengElsevierResults in Chemistry2211-71562025-07-011610253510.1016/j.rechem.2025.102535Bio-inspired synthesis of Co-doped CuO/ZnO nanocomposites for enhanced photocatalytic degradation of methyl blueSamrawit Mekonen Yimer0Ashenafi Zeleke Melaku1Department of Chemistry, Natural and Computational Science, Woldia University, EthiopiaCorresponding author.; Department of Chemistry, Natural and Computational Science, Woldia University, EthiopiaEnvironmental pollution by organic dyes poses a significant global threat, necessitating sustainable remediation techniques. This study reports the green synthesis of a novel cobalt-doped CuO/ZnO nanocomposite using Hagenia abyssinica leaf extract as a bioreducing and capping agent, offering an eco-friendly alternative to traditional methods. The synthesized nanocomposite was characterized by XRD, FTIR, SEM-EDX, and UV–Vis DRS. XRD confirmed the successful formation of Co-doped CuO/ZnO with distinct peaks indicating cobalt incorporation and enhanced crystallinity. Confirmation of cobalt integration into the CuO/ZnO nanocomposite is provided by two key observations: a new peak appearing around 31∘, and shifts in the peak positions at both 29.4∘ and 31.7∘. These changes also point to an alteration in the crystallinity of the material. Additionally, the distinctive metal (Co, Cu, Zn)‑oxygen stretching peaks are visible in the FT-IR spectrum between 500 and 900 nm wavelengths. FTIR analysis verified the role of phytochemicals in stabilization, while SEM-EDX result revealed uniformly distributed elements of nanoparticles. Optical properties from UV–Vis DRS spectrum showed that cobalt doping effectively reduced the bandgap of CuO/ZnO, enabling efficient sunlight absorption. Photocatalytic degradation tests demonstrated that the Co-doped CuO/ZnO nanocomposite significantly enhanced the degradation of methyl blue dye. Notably 2 mg of 0.05 %Co-5 %CuO/ZnO exhibited superior activity (93.82 % degradation of 10 mg MB in 80 min) compared to pristine ZnO (57.2 %), attributed to reduced electron-hole recombination and optimized bandgap. This bio-mediated approach offers a promising, sustainable solution for industrial wastewater treatment.http://www.sciencedirect.com/science/article/pii/S2211715625005181Green synthesisNanocompositePhotocatalyticMB dyeEnvironmental remediation |
| spellingShingle | Samrawit Mekonen Yimer Ashenafi Zeleke Melaku Bio-inspired synthesis of Co-doped CuO/ZnO nanocomposites for enhanced photocatalytic degradation of methyl blue Results in Chemistry Green synthesis Nanocomposite Photocatalytic MB dye Environmental remediation |
| title | Bio-inspired synthesis of Co-doped CuO/ZnO nanocomposites for enhanced photocatalytic degradation of methyl blue |
| title_full | Bio-inspired synthesis of Co-doped CuO/ZnO nanocomposites for enhanced photocatalytic degradation of methyl blue |
| title_fullStr | Bio-inspired synthesis of Co-doped CuO/ZnO nanocomposites for enhanced photocatalytic degradation of methyl blue |
| title_full_unstemmed | Bio-inspired synthesis of Co-doped CuO/ZnO nanocomposites for enhanced photocatalytic degradation of methyl blue |
| title_short | Bio-inspired synthesis of Co-doped CuO/ZnO nanocomposites for enhanced photocatalytic degradation of methyl blue |
| title_sort | bio inspired synthesis of co doped cuo zno nanocomposites for enhanced photocatalytic degradation of methyl blue |
| topic | Green synthesis Nanocomposite Photocatalytic MB dye Environmental remediation |
| url | http://www.sciencedirect.com/science/article/pii/S2211715625005181 |
| work_keys_str_mv | AT samrawitmekonenyimer bioinspiredsynthesisofcodopedcuoznonanocompositesforenhancedphotocatalyticdegradationofmethylblue AT ashenafizelekemelaku bioinspiredsynthesisofcodopedcuoznonanocompositesforenhancedphotocatalyticdegradationofmethylblue |