Band structure tuning of ZnO/CuO composites for enhanced photocatalytic activity
The toxic dye pigments, even in small quantities, can damage ecosystems. Removing organic, inorganic, and microbiological contaminants from wastewater via heterogeneous photocatalysis is a promising method. Herein, we report the band structure tuning of ZnO/CuO nanocomposites to enhance photocatalyt...
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| Published in | Journal of Saudi Chemical Society Vol. 27; no. 3; p. 101639 |
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| Main Authors | , , , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
01.05.2023
Elsevier |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1319-6103 |
| DOI | 10.1016/j.jscs.2023.101639 |
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| Abstract | The toxic dye pigments, even in small quantities, can damage ecosystems. Removing organic, inorganic, and microbiological contaminants from wastewater via heterogeneous photocatalysis is a promising method. Herein, we report the band structure tuning of ZnO/CuO nanocomposites to enhance photocatalytic activity. The nanocomposites were synthesized by a chemical approach using step-wise implantation of p-type semiconductor CuO to n-type semiconductor ZnO. Various characterization techniques such as X-ray diffraction analysis (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray analysis (EDX) and UV spectroscopy were used to investigate the crystal structure, surface morphology, elemental composition and optical properties of the synthesized samples. As the CuO content increased from 10% to 50% in ZnO/CuO nanocomposites, the optical bandgap decreased from 3.36 to 2.14 eV. The photocatalytic activity of the samples was evaluated against the degradation of methylene blue (MB) under visible irradiation. Our study demonstrates a novel p–n junction oxide photocatalyst based on wt. 10% CuO/ZnO with superior photocatalytic activity. Effectively 66.6% increase in degradation rate was achieved for wt. 10% CuO/ZnO nanocomposite compared to pure ZnO nanoparticles. |
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| AbstractList | The toxic dye pigments, even in small quantities, can damage ecosystems. Removing organic, inorganic, and microbiological contaminants from wastewater via heterogeneous photocatalysis is a promising method. Herein, we report the band structure tuning of ZnO/CuO nanocomposites to enhance photocatalytic activity. The nanocomposites were synthesized by a chemical approach using step-wise implantation of p-type semiconductor CuO to n-type semiconductor ZnO. Various characterization techniques such as X-ray diffraction analysis (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray analysis (EDX) and UV spectroscopy were used to investigate the crystal structure, surface morphology, elemental composition and optical properties of the synthesized samples. As the CuO content increased from 10% to 50% in ZnO/CuO nanocomposites, the optical bandgap decreased from 3.36 to 2.14 eV. The photocatalytic activity of the samples was evaluated against the degradation of methylene blue (MB) under visible irradiation. Our study demonstrates a novel p–n junction oxide photocatalyst based on wt. 10% CuO/ZnO with superior photocatalytic activity. Effectively 66.6% increase in degradation rate was achieved for wt. 10% CuO/ZnO nanocomposite compared to pure ZnO nanoparticles. |
| ArticleNumber | 101639 |
| Author | Aziz, Uzma Ali, Zulfqar Shah, Attaullah Safeen, Kashif Khan, Kamran Mubeen, Khalida Irshad, Afshan Ghani, Tayyaba ul Haq, Ihsan Safeen, Akif |
| Author_xml | – sequence: 1 givenname: Khalida surname: Mubeen fullname: Mubeen, Khalida organization: Department of Physics and Applied Mathematics, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Nilore 45650, Islamabad, Pakistan – sequence: 2 givenname: Afshan surname: Irshad fullname: Irshad, Afshan email: afshan@pieas.edu.pk organization: Department of Physics and Applied Mathematics, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Nilore 45650, Islamabad, Pakistan – sequence: 3 givenname: Akif surname: Safeen fullname: Safeen, Akif email: akifsafeen@upr.edu.pk organization: Department of Physics, University of Poonch Rawalakot, AJK 12350, Pakistan – sequence: 4 givenname: Uzma surname: Aziz fullname: Aziz, Uzma organization: National Institute of Lasers and Optronics College Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad 45650, Pakistan – sequence: 5 givenname: Kashif surname: Safeen fullname: Safeen, Kashif organization: Department of Physics, Abdul Wali Khan University Mardan, 23200, Pakistan – sequence: 6 givenname: Tayyaba surname: Ghani fullname: Ghani, Tayyaba organization: Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Nilore 45650, Islamabad, Pakistan – sequence: 7 givenname: Kamran surname: Khan fullname: Khan, Kamran organization: National Institute of Lasers and Optronics College Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad 45650, Pakistan – sequence: 8 givenname: Zulfqar orcidid: 0000-0003-1137-0253 surname: Ali fullname: Ali, Zulfqar organization: National Institute of Lasers and Optronics College Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad 45650, Pakistan – sequence: 9 givenname: Ihsan surname: ul Haq fullname: ul Haq, Ihsan organization: National Agriculture Research Center, Islamabad, Pakistan – sequence: 10 givenname: Attaullah surname: Shah fullname: Shah, Attaullah organization: National Institute of Lasers and Optronics College Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad 45650, Pakistan |
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| Keywords | Photodegradation Metal oxide semiconductor Chemical synthesis Heterojunction |
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| Title | Band structure tuning of ZnO/CuO composites for enhanced photocatalytic activity |
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