Green Synthesis of copper oxide nanoparticles and its effective applications in the visible light assisted photodegradation of dyes
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- Princess Jeba1, P. Ramkumar, S. Alwyn David and J. Ashli
E-mail address: dprincessjeba@gmail.com
Abstract
Copper oxide nanoparticles (CuO Nps) were synthesized using Millettia pinnata leaf extract via an eco-friendly, cost-effective, reliable, and simple green synthetic pathway and were evaluated for visible light assisted photocatalytic properties by carrying out photocatalytic degradation of dyes. The green synthesized CuO NPs were characterized using various analytical techniques like UV-Visible Spectroscopy (UV-Vis), Fourier-Transform Infrared Spectroscopy (FT-IR), X-Ray Diffractometer (XRD), Transmission Electron Microscopy (TEM) and (EDAX) analysis. The biosynthesis was affirmed by UV-vis spectroscopy exhibiting peak at 290 nm. Optical absorption measurements are used to determine optical characteristics such as absorption coefficient and band gap. CuO nanoparticles have a band gap of 1.68 eV, according to the Tauc plot [1,2] (figure1A).In FTIR analysis, the chemical bonds corresponds to the phytochemicals responsible for bioreduction activity were identified. [3,4] Energy dispersive spectroscopy (EDS) showed high intense metallic peak of copper (Cu), oxygen (O) and low intense peaks of carbon (C) due to the capping action of biomolecules of plant extract in CuO NPs formation. The X-ray diffraction (XRD) pattern showed distinctive peaks corresponding to (200), (211) and (310) planes revealing the high crystalline nature of synthesized CuO NPs shown in (figure 1B) [1,2].The TEM analysis also confirmed that the formed nanoparticles had spherical morphology with uniform symmetry. The photocatalytic studies revealed that synthesized nanoparticles have the efficiency to degrade methylene blue and malachite green completely. Moreover, the biological significance of green synthesized CuO NPs was assessed by antibacterial activity against selected pathogenic bacterial organisms.
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