Green synthesis of multifunctional carbon coated copper oxide nanosheets and their photocatalytic and antibacterial activities

Abstract

The studies of metal oxides in environmental remediation of chemical and biological pollutants are gaining colossal importance. Herein, we report the facile synthesis of multifunctional copper oxide nanosheets (CuO NS) using an aqueous extract of Rhazya stricta. The phytochemical investigation of R. stricta indicated the presence of saponins, tannins, and reducing sugars, responsible for the reduction and stabilization of CuO NS. A UV–Visible spectrophotometer initially confirmed the fabrication of CuO NS with specific Surface Plasmon Resonance at 294 nm. Field Emission Scanning Electron Microscopy (FE-SEM), Fourier-transform infrared spectroscopy FTIR, and XRD were further used to characterize the CuO NS. The obtained CuO NS were poly-dispersed with an average size of 20 nm. Interestingly these particles were aligned together in 3D cubical sheets layered above each other via self-assembly. The as-synthesized CuO NS showed enhanced antibacterial potential (17.63 mm, overall mean inhibition zone) in comparison to the known antibiotics (11.51 mm, overall mean inhibition zone) against both Solanaceous crop's wilt-causing bacteria (Ralstonia solanacearum and Clavibacter michiganensis). Furthermore, the appreciable photocatalytic potential of CuO NS has also been observed, causing 83% degradation of methylene blue (MB) upon solar irradiation. The synthesis methodology is devoid of any toxic waste or by-products. It could be used to produce eco-friendly CuO nanomaterial for industrial uses.

Chitosan-Grafted Polyacrylic Acid-Doped Copper Oxide Nanoflakes Used as a Potential Dye Degrader and Antibacterial Agent: In Silico Molecular Docking Analysis

“…65 CuO surface plasmon vibration excitation generated an absorption peak at 294 nm. 66 PAA strong absorption below 235 nm 67 and the CS absorption peak at 208 nm 68 shifted to 340 nm in the grafted structure. The Tauc plot was constructed to estimate the optical band gap (Eg) through straight-line part extrapolation toward the x axis presented in Figure 3b.…”

Bioengineering of CuO porous (nano)particles: role of surface amination in biological, antibacterial, and photocatalytic activity

“…When the excited electrons travel from VB to CB, electron–hole (e − /H + ) pairs are generated and transferred to the surface of the catalyst and react with other materials such as O 2 and H 2 O; In VB and CB, e − and H + are able to generate hydroxyl radical (·OH) and O 2 − , respectively which are responsible for the degradation of pollutants 54 – 56 . For example, Iqbal and coworkers synthesized CuO nanoparticles using an aqueous extract of Rhazya stricta and investigated it in the degradation of methylene blue (MB) wherein CuO NPs caused 83% degradation of MB after 140 min of reaction 57 . Some of the unique studies are listed in Table 3 .…”

Modification of the crystallographic parameters in a biomaterial employing a series of gamma radiation doses

“…The optical band gap was measured by using UV-vis spectrophotometer data and employing the Tauc method as presented in eqn (23) for direct bandgap. 37,38 ∝ hϑ = A ( hϑ − E g ) n where h = Plank's constant, ∝ = absorption co-efficient, ϑ = photon frequency, A = constant, E g = optical band gap, and n = 2 (constant) for direct band gap.…”

“…The optical band gap was measured by using UV-vis spectrophotometer data and employing the Tauc method as presented in eqn ( 23) for direct bandgap. 37,38 ∝hϑ…”