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Shaik, Jilani Purusottapatnam
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article
Synthesis and characterization of ZnO/β-cyclodextrin/nicotinic acid nanocomposite and its biological and environmental application
Abstract
<jats:title>Abstract</jats:title><jats:p>In the present work, the disk-shaped zinc oxide (ZnO) nanoparticles were synthesized and functionalized with β-cyclodextrin (β-CD) and nicotinic acid (vitamin B3) using the wet co-precipitation method. The functionalized ZnO/β-CD/nicotinic acid nanocomposite materials were characterized using UV-visible spectroscopy (UV-Vis), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), field emission electron microscopy (FESEM), and band-gap energy analysis. The band gap value (<jats:italic>E</jats:italic><jats:sub>g</jats:sub>) was 4.3 eV. The average XRD crystallite size was determined using the Scherrer formula and was found to be 50 nm. The ZnO/β-CD/nicotinic acid nanocomposite material showed a photocatalytic effect for dye-polluted wastewater. It also showed an antibacterial effect against the Gram-positive bacterial strain <jats:italic>Streptococcus aureus</jats:italic> (<jats:italic>S. aureus</jats:italic>) but did not show any antibacterial activity with Gram-negative <jats:italic>Escherichia coli</jats:italic> (<jats:italic>E. coli</jats:italic>). The ZnO/β-CD/nicotinic acid nanocomposite also showed antifungal activity with <jats:italic>Aspergillus niger (A. niger).</jats:italic> It was noticed that ZnO/β-CD/nicotinic acid nanocomposite showed efficient anticancer activity with IC<jats:sub>50</jats:sub> = 14.95 µg·mL<jats:sup>−1</jats:sup> in MCF-7 cell lines. Because of the formation of singlet oxygen (O<jats:sub>2</jats:sub>˙<jats:sup>−</jats:sup>) and hydrogen oxide radical (–OH˙), the composite material showed a photodegradation reaction against aq. solution of methylene blue dye. After 190 min, the blue colour of aq. solution methylene blue was decolourized at 6 pH at a constant time interval.</jats:p>