ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Photocatalytic and antibacterial activity of green synthesized yttrium doped cobalt oxide nanoparticles using tender coconut water (Cocos nucifera)

Niveditha Sivagnanam, Sridhar Pichai, Palani Perumal, and Venkatachalam Kandan

Department of Analytical Chemistry, University of Madras, Chennai, India

E-mail: kvenkatchemistry@gmail.com

Received: 30 October 2023  Accepted: 29 April 2024

Abstract:

Dyes are discharged from paint, textiles, and other businesses into their effluent, which harms the ecosystem over time. The nanoparticles have a high surface area-to-volume ratio; hence, they can treat pollutants quickly and effectively. In this study, yttrium-doped cobalt oxide nanoparticles were synthesized using tender coconut water as a stabilizing and capping agent. The cubic phase was identified by X-ray diffraction spectroscopy (XRD), and the crystallite sizes of Co₃O₄ and Y-doped Co₃O₄ nanoparticles were found to be 18.44 nm and 11.03 nm, respectively. The cubic phase of Co₃O₄ and Y-doped Co₃O₄ nanoparticles was confirmed by transmission electron microscopy analysis, and it is well related to XRD analysis. The Y-doped cobalt oxide nanoparticles had a calcination temperature of 500 °C was found by thermogravimetric analysis. Fourier-transform infrared spectroscopic analysis showed the stretching vibrations of Co (II) O and Co (III) O with respective peaks. UV–visible diffuse reflectance spectroscopy (DRS-UV) revealed a red shift in the bandgap energy for Y-doped Co₃O₄ nanoparticles. The photocatalytic activity of the Y-doped Co₃O₄ nanoparticles was examined with brilliant blue, neutral red, and crystal violet dyes, and degradation efficiency was 52.37%, 90.98%, and 89.98%, respectively. The dyes degraded under visible light after 180 min, according to first-order kinetics. The antibacterial activity of the Y-doped Co₃O₄ nanoparticles against Staphylococcus aureus, Enterococcus faecalis, Staphylococcus epidermis, Salmonella enterica, E. coli, and Pseudomonas aeruginosa bacterial strains was assessed using the agar well diffusion method, and it was found that the pathogens were inhibited.

Keywords: Green synthesis; Cocos nucifera; Y-doped Co3O4 nanoparticles; Antibacterial activity; Photocatalytic activity

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-024-03493-4

Chemical Papers 78 (9) 5527–5544 (2024)