Abstract
In this work, ZnO nanocrystals (NCs) have been effectively synthesized by a simple, efficient and cost-effective method using coconut husk extract as a novel fuel. The synthesized NCs are characterized by UV-Vis, XRD, FT-IR, SEM, EDX, Raman and PL studies. The obtained ZnO were found to be UV-active with a bandgap of 2.93 eV. The X-ray diffraction pattern confirms the crystallinity of the ZnO with hexagonally structured ZnO with a crystallite size of 48 nm, while the SEM analysis reveals the hexagonal bipyramid morphology. Photocatalytic activities of the synthesized ZnO NCs are used to degrade methylene blue and metanil yellow dyes.
Highlights
Nanomaterials have emerged as an inevitable part of modern science due to their disparate physical, chemical or biological properties with regard to their bulk composition
Absorbance of the prepared ZnO nanocrystals was measured in a range of 250–800 nm
The value of the bandgap was found to be lower than the reported values, which is usually due to the incorporation or doping of ZnO nanoparticles with other material, and this decrease in value can be attributed to the
Summary
Nanomaterials have emerged as an inevitable part of modern science due to their disparate physical, chemical or biological properties with regard to their bulk composition. Zinc oxide (ZnO) nanoparticles are often chosen among the transition metal oxides owing to their diverse properties, such as high thermal and chemical resistance [13], optoelectrical [14], semiconducting [15,16], catalytic [17], antimicrobial [18,19] and antibacterial [20]. This n-type semiconductor has a broad bandgap of ~3.37 eV and significant excitation energy of 60 meV. Another study reported by Alanazi and coworkers employed the Gd/N co-doped ZnO for the degradation of MB, which yielded good results [27]
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