Abstract
The preparation, characterization, and application of Nickel oxide (NiO)–Copper oxide (CuO)–Zinc oxide (ZnO) transition nanometal oxides have significantly enhanced their tunable properties for superior multifunctional performances compared with well-known metal oxides. NiO–CuO–ZnO nano transition metal oxides were synthesized by a simple eco-friendly solution combustion method. X-ray diffraction studies revealed distinct phases such as monoclinic, cubic, and hexagonal wurtzite for CuO, NiO, and ZnO, respectively, with NiO having the highest composition. The particle sizes were found to be in the range between 25 and 60 nm, as determined by powder X-ray diffraction. The energy bandgap values were found to be 1.63, 3.4, and 4.2 eV for CuO, ZnO, and NiO, respectively. All metal oxides exhibited a moderate degradation efficiency for AR88 dye. The results of ultraviolet–visible absorption spectra helped identify the bandgap of metal oxides and a suitable wavelength for photocatalytic irradiation. Finally, we concluded that the electrochemical studies revealed that the synthesized materials are well suitable for sensor applications.
Highlights
Developing nations have encountered dangerous environmental risks in the last couple of decades owing to a failure to deliver pure water
Nickel oxide (NiO), CuO, and zinc oxide (ZnO) NPs were synthesized using a solution of Centella asiatica plant (India) extract as a green fuel, the dried leaves of Centella Asiatica plant were used to green synthesize NPs by combustion
The PXRD analysis confirms the phase purity of the samples, and the planes obtained from the analysis are in good agreement with the SAED pattern obtained from the transmission electron microscopy (TEM) analysis
Summary
Developing nations have encountered dangerous environmental risks in the last couple of decades owing to a failure to deliver pure water. The organic industry directly disposes of its chemical waste to clean water sources, resulting in many environmental problems [3]. For the study of photocatalytic and sensing applications, binary metal oxide nanocomposites with distinct morphology and structure are currently being developed, which is an important perspective. 10–15% of the population were negatively affected, the wastewater discharged by these industries is severely hazardous due to the carcinogenic nature of the organic contaminants present. It has adverse effects on aquatic life. The produced metal oxides were applied to degrade Acid red 88 (AR88 MW. 400.38 g/mol) dye by a photocatalytic interaction with ultraviolet (UV) light radiation
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