Photocatalytic performance of rod‐shaped copper oxides prepared by spin coating

Abstract

Copper oxides (CuO and Cu 2 O), having narrow bandgap and a variety of chemophysical properties, are attractive in many fields such as solar cells, energy conversion, optoelectronic devices, and catalyst. In this work, these copper oxides are synthesised via co-precipitation method and spin coating and annealed in various temperatures. Then, samples are characterised by X-ray powder diffraction, scanning electron microscopy (SEM) and ultraviolet-visible light absorption spectra. From the SEM images of sample annealed at 450°C, the diameter and lengths range of the rod-shaped particles were 30-70 and 200-300 nm, respectively. Finally, to investigate the photocatalytic activity of oxides, methyl orange (MeO) degradation by copper oxides under UV irradiation was studied. Pure CuO with bandgap energy 1.37 eV and specific surface areas 91.3 m 2 /g had a greater efficiency of MeO degradation value 87.8%.

Synthesis and characterisation of TiO 2 nanoparticles/Fe 2 O 3 waste chips composite

“…of Fe 2 O 3 . According to the pattern and by using Debye–Scherrer equation ( d = ( kλ / β cos θ ) [21], the crystallite size of anatase phase was determined to be of the order of 23 nm.…”

Investigation of photocatalytic performance of natural zeolite/TiO 2 composites

“…Absorption onset wavelength) λ g , nm) of the crossing point is between the line extrapolated from the onset of the rising part of the absorption spectrum and axis X of the curve. Bandgap ( E g , eV) was measured by the following equation [15]: …”

“…Throughout the examination, a sample of each solution was taken at 30 min intervals, and the concentration of the pollutant was determined utilising a UV–vis spectrophotometer device. The extent of the degradation was measured by the following equation: where C 0 is the initial concentration of the pollutant in the solution, and C is that of the pollutant after the time t [15].…”

Photocatalytic activity of CuO nanoparticles for organic and inorganic pollutants removal in wastewater remediation

“…Additionally, Dutta et al [66] and surface area of catalyst need to be taken into consideration to explain the experimentally observed degradation efficiency. For example, in a study reported by Koohestani [68], the degree of elimination of methyl orange using pure CuO NPs was found to be higher than Cu2O/CuO mixture. According to the author, this could be due to the smaller bandgap and larger specific surface area of CuO NPs than the Cu2O/CuO photocatalyst.…”