Abstract
Purpose: To synthesize copper oxide (CuO) nanoparticles using a ecofriendly technique and evaluate their antimicrobial, antioxidant and photo-catalytic dye degradation potentials. Methods: A superficial method (solution combustion method) was employed for the synthesis of copper oxide nanoparticles from an aqueous extract of Abutilon indicum . The CuO nanoparticles were characterized using x-ray diffraction (XRD), energy-dispersive x-ray spectroscopy (EDX), scanning electron microscope (SEM) and ultraviolet-visible (UV-Vis) spectroscopic techniques. The antimicrobial activity of the CuO nanoparticles was determined by agar well diffusion method, while their antioxidant properties were assessed by DPPH radical scavenging, ferric reducing antioxidant power (FRAP), total antioxidant, ferric thiocyanate (FTC) and total phenolic content (TPC) assays. The photo-catalytic degradation activity of synthesized CuO nanoparticles was assessed by the degradation of Acid Black 210 (AB) dye under sunlight irradiation. Results: XRD, EDX and SEM results confirmed successful synthesis of CuO nanoparticles, with hexagonal, wurtzite and sponge crystal structure. Photo-catalytic data revealed that the nanoparticles are a good catalyst for effective degradation of Acid Black 210. The nanoparticles also exhibited remarkable antioxidant activity, with IC 50 and FRAP values ranging from 40 ± 0.23 to 84 ± 0.32 μg/ml, and 0.65 ± 0.01 to 9.10 ± 0.21 Trolox equivalent/mL, respectively. Significant bactericidal activity was manifested by the CuO nanoparticles against Klebsiella and Bacillus subtilis with zone of inhibition of 14 ± 0.05 and 15 ± 0.11 mm, respectively. Conclusion: The synthesized CuO nanoparticles exhibit antibacterial and antioxidant potential, indicating that they are good candidates for future therapeutic applications. Keywords: CuO nanoparticles, Green synthesis, Photo-catalytic degradation, Antioxidant, Antimicrobial
Highlights
Copper oxide (CuO) has a wide range of applications in various fields, from energy conversion and storage through environmental science, electronics and sensor [1]
CuO nanoparticles have received a lot of attention because they are the simplest members of the family of copper salts, and they possess a range of useful physical properties such as electron correlation effects, spin dynamics and high temperature superconductivity [2]
The current study was aimed at green synthesis of CuO nanoparticles using aqueous leaf extract of Abutilon indicum as a green fuel, and determination of the antioxidant and antimicrobial properties of the synthesized nanoparticles
Summary
Copper oxide (CuO) has a wide range of applications in various fields, from energy conversion and storage through environmental science, electronics and sensor [1]. The current study was aimed at green synthesis of CuO nanoparticles using aqueous leaf extract of Abutilon indicum as a green fuel, and determination of the antioxidant and antimicrobial properties of the synthesized nanoparticles. CuO nanoparticles were synthesized using the green combustion method, with the leaf extract of Abutilon indicum as fuel. CuO nanoparticles (0.5 mg/mL) and 4 mL of reagent solution (28 mM sodium phosphate, 4 mM ammonium molybdate and 0.6 M sulphuric acid,) were put in a capped test tube and incubated in a water bath at 95 °C for 90 min. The reaction mixture contained linoleic acid emulsion (2.5 mL, 0.02 M, pH 7); 2.0 mL of phosphate buffer (0.02 M, pH 7) and 0.1 mL of sample solution (0.5 mg/mL) (the linoleic acid emulsion was prepared by mixing 0.28 g of linoleic acid, 0.28 g of Tween-20 as emulsifier, and 50.0 mL of phosphate buffer). Where As and Ac are the absorbance of test sample and control, respectively
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