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Abstract
The removal of toxic dye pigments from the environment is of utmost importance since even trace amounts of these pollutants can lead to harmful impacts on ecosystems. Heterogeneous photocatalysis is a potential technique for eliminating microbiological, inorganic, and organic pollutants from wastewater. Here, we report the band gap alteration of ZnO by making its composites with CuSe to enhance photocatalytic activity. The purpose is to develop metal oxide nanocomposites (ZnO/CuSe) as an effective and efficient material for the photodegradation of methyl blue. The photocatalysts, ZnO nanorods, CuSe, and ZnO/CuSe nanocomposites of different weight ratios were synthesized by the simple and cost-effective technique of precipitation. UV–Vis spectra verified that the ZnO/CuSe photocatalyst improved absorption in the visible region. The optical bandgap of ZnO/CuSe nanocomposites reduced from 3.37 to 2.68 eV when CuSe concentration increased from 10 to 50%. ZnO/CuSe composites demonstrated better photocatalytic activity than ZnO when exposed to UV–visible light. The pure ZnO nanorods could absorb UV light and the nanocomposites could absorb visible light only; this was attributed to the transfer of excited high-energy electrons from ZnO to CuSe.
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1 Pakistan Institute of Engineering and Applied Sciences (PIEAS), Department of Physics and Applied Mathematics, Nilore, Islamabad, Pakistan (GRID:grid.420112.4) (ISNI:0000 0004 0607 7017); Pakistan Institute of Engineering and Applied Sciences, National Institute of Lasers and Optoelectronics College, Nilore, Islamabad, Pakistan (GRID:grid.420112.4) (ISNI:0000 0004 0607 7017)
2 Abdul Wali Khan University, Department of Physics, Mardan, Pakistan (GRID:grid.440522.5) (ISNI:0000 0004 0478 6450)
3 Pakistan Institute of Engineering and Applied Sciences (PIEAS), Department of Physics and Applied Mathematics, Nilore, Islamabad, Pakistan (GRID:grid.420112.4) (ISNI:0000 0004 0607 7017); PIEAS, Center for Mathematical Sciences, Nilore, Islamabad, Pakistan (GRID:grid.420112.4) (ISNI:0000 0004 0607 7017)
4 University of Poonch Rawalakot, Department of Physics, Rawalakot, Pakistan (GRID:grid.420112.4)
5 Pakistan Institute of Engineering and Applied Sciences (PIEAS), Department of Metallurgy and Material Engineering, Nilore, Islamabad, Pakistan (GRID:grid.420112.4) (ISNI:0000 0004 0607 7017)
6 International Islamic University, Department of Physics, Faculty of Basic and Applied Sciences, Islamabad, Pakistan (GRID:grid.411727.6) (ISNI:0000 0001 2201 6036)
7 University of Lakki Marwat, Department of Physics, Lakki Marwat, Pakistan (GRID:grid.513214.0)
8 University of Poonch Rawalakot, Department of Botany, Rawalakot, Pakistan (GRID:grid.513214.0)
9 University of California, Berkeley, School of Public Health, Berkeley, USA (GRID:grid.47840.3f) (ISNI:0000 0001 2181 7878)
10 King Saud University, Department of Agricultural Engineering, College of Food and Agriculture Sciences, Riyadh, Saudi Arabia (GRID:grid.56302.32) (ISNI:0000 0004 1773 5396)
11 King Saud University, Plant Production Department, College of Food and Agriculture Sciences, Riyadh, Saudi Arabia (GRID:grid.56302.32) (ISNI:0000 0004 1773 5396)
12 Pakistan Institute of Engineering and Applied Sciences, National Institute of Lasers and Optoelectronics College, Nilore, Islamabad, Pakistan (GRID:grid.420112.4) (ISNI:0000 0004 0607 7017)