Abstract
The synthesis and characterization of chitosan encapsulated copper oxide nanocomposites (CuNPs) using plant extracts for the photocatalytic degradation of second-generation antibiotics, cefixime and cefuroxime, were investigated. The study revealed that the presence of diverse chemical components in the plant extract significantly influenced the size of the CuNPs, with transmission electron microscopy (TEM) showing spherical shapes and sizes ranging from 11–35 nm. The encapsulation process was confirmed by an increase in size for certain samples, indicating successful encapsulation. X-ray photoelectron spectroscopy (XPS) analysis further elucidated the chemical makeup, confirming the valency state of Cu2+ and the presence of Cu–O bonding, with no contaminants detected. Photocatalytic activity assessments demonstrated that the copper oxide nanocomposites exhibited significant degradation capabilities against both antibiotics under UV light irradiation, with encapsulated nanocomposites (EnCu30) showing up to 96.18% degradation of cefuroxime within 60 min. The study highlighted the influence of chitosan encapsulation on enhancing photocatalytic performance, attributed to its high adsorption capability. Recycling studies confirmed the sustainability of the Cu nanocomposites, maintaining over 89% degradation rate after five consecutive cycles. This research underscores the potential of green-synthesized CuNPs as efficient, stable photocatalysts for the degradation of harmful antibiotics, contributing to environmental sustainability and public health protection.
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Acknowledgements
The Sophisticated Analytical Instrumentation Facility (SAIF) lab at Panjab University, Chandigarh, India, 160014 provided TEM characterization of the produced nanocomposites, to which the authors gratefully acknowledge.
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Nishat Bhatia: conceptualization, investigation, methodology, writing—original draft, Ragini Raj Singh: software, formal analysis. Asha Kumari, Gulshan Kumar: investigation, methodology, Abhishek Kandwal: software, conceptualization, Rahul Sharma: conceptualization, supervision, resources, data curation, software.
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Bhatia, N., Kumari, A., Singh, R.R. et al. Green synthesis of chitosan-encapsulated CuO nanocomposites for efficient degradation of cephalosporin antibiotics in contaminated water. Environ Sci Pollut Res (2024). https://doi.org/10.1007/s11356-024-33476-7
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DOI: https://doi.org/10.1007/s11356-024-33476-7