Synthesis of copper oxide nanoparticles by chemical and biogenic methods: photocatalytic degradation and in vitro antiox
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(2020) 5:14
ORIGINAL PAPER
Synthesis of copper oxide nanoparticles by chemical and biogenic methods: photocatalytic degradation and in vitro antioxidant activity A. Muthuvel1 · M. Jothibas1 · C. Manoharan2 Received: 26 March 2020 / Accepted: 30 May 2020 © Springer Nature Switzerland AG 2020
Abstract Copper oxide nanoparticles (CuO-NPs) were synthesized using two different methods (chemical and biosynthesis) to study the influence of the preparation method on the structural, optical, morphological, photocatalyst, antibacterial and in vitro antioxidant of these nanoparticles. The synthesized nanoparticles were analysed by XRD, UV–Vis, HR-TEM, DLS, ZE, PL and FT-IR spectroscopy. The X-ray diffraction spectra showed the single-phase monoclinic structure of copper oxide, with an average crystallite size of 2.05–3.00 nm. HR-TEM analysis confirmed the spherical morphology of the synthesized CuO-NPs using chemical and biological methods with an average size of 32 nm and 25 nm, respectively. The synthesized CuO-NPs exhibited potential photocatalytic activity towards the degradation of methylene blue dye on exposing to sunlight irradiation. The degradation effectiveness against methylene blue dye was found to be 85 and 97% for chemical and biosynthesized CuO-NPs, respectively. Furthermore, antibacterial and antioxidant activities were evaluated. The biogenic method showed a significant antibacterial activity against Gram-negative bacteria E. coli and B. subtilis than Gram-positive bacteria and also DPPH assay. Keywords CuO-NPs · Biosynthesis · Solanum nigrum · Photocatalytic · Antibacterial
Introduction Nanoparticles that are having size less than 100 nm are being extensively utilized in the nanoscience application [1]. Metal and metal oxide nanoparticles are emerging as potential candidate in the field of nanoscience and nanotechnology. Metallic nanoparticles with physical, chemical, electrical and optical properties play a crucial role depending on their size and shape. They find a wide range of application, namely sensors, catalysis, antibacterial, antioxidants, etc. Metal oxide nanoparticles such as, ZnO, CoO, TiO2, SnO2 and CuO, have been investigated for their environmental and biomedical application [2]. Especially, copper oxide nanoparticle (CuO-NPs) exhibits high potentiality in the metal oxide nanoparticles due to its low cost, optical, catalytic and antimicrobial properties. CuO-based * M. Jothibas [email protected] 1
PG & Research Department of Physics, T.B.M.L. College, Porayar, Mayiladuthurai, Tamil Nadu 609307, India
Department of Physics, Annamalai University, Annamalai nagar, Cuddalore, Tamil Nadu 608002, India
2
nanoparticles are regarded as photocatalysts due to their bandgap (1.35–3.5 eV), low toxicity, easy availability, and surface synthesis among various semiconductor photocatalysts under sunlight irradiation [3]. CuO-NPs attracts attention because of its large surface area, enhanced oxygen adsorption capability, high surface and considered as promising candidate with enhanced pho
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