Browsing by Author "Hariganesh, S."

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    Efficient One-Pot Green Synthesis of Chitosan-Copper Bionanoparticles Via Sustainable Hydrothermal Carbonization Route for Photocatalysis and Fenton Studies
    (Springer, 2025) Sangeetha, A.; Hariganesh, S.; Kumar, P.; Mishra, A.
    A bionanoparticle was fabricated using a facile one-pot green synthesis assisted through Hydrothermal Carbonization and evaluated for its potential as a catalyst in Advanced Oxidation Processes (AOPs) for wastewater treatment. Bio-wastes like onion peel, corn husk and groundnut shell has been employed for green synthesis of Copper-Chitosan bionanoparticles which were characterised for their optical, physical and structural properties with the available technologies to study their composition. The onion peel extract undergone Carbonization along with Chitosan during the Hydrothermal Carbonization process, has augmented the bionanoparticle to function as a visible light active photocatalyst. The synthesized materials were utilized for the degradation of dye and drug using the AOP like Photocatalysis, Fenton-like and Photo-Fenton process. The onion peel extracts aided bionanoparticles excelled in degrading Methylene Blue dye under 15 W LED, achieving 95.9% efficiency in 120 min. Additionally, it functioned as a Fenton-like catalyst, degrading Methylene Blue dye in 60 min with 96.2% efficiency, and as a Photo-Fenton catalyst, achieving 98.1% efficiency in 25 min. Since the catalyst had higher efficiency in short time for Photo-Fenton degradation, it has been optimized by adjusting parameters such as concentration of catalyst and dye, as well for varied pH levels. The catalyst achieved 90.7% efficiency during its fifth stability cycle study. For Rifampicin drug degradation, the observed efficiency was 97.1% in 70 min. This work provides a green way of synthesizing bionanoparticles and its utilization towards the waste water treatment towards degrading the emerging pollutants. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2025.
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    Onion Peels Assisted Synthesis of Biofunctionalized CuO Nanoparticles as Nano-Photocatalyst and Nano-Antibiotic
    (Springer Science and Business Media Deutschland GmbH, 2024) Sangeetha, A.; Hariganesh, S.; Abarna, B.; Kumar, P.; Ramesh, M.R.; Doddamani, M.
    Controlled precipitation of metal oxide via agro waste, providing an eco-friendly synthesis route, was verified through characteristic analysis. CuO nanoparticles were synthesized via the sol-gel method with and without aqueous extract of small onion peels, showcasing their photocatalytic and antibiotic efficacy. Fourier Transform Infrared spectroscopy (FTIR), X-ray Diffraction (XRD), and Scanning Electron Microscopy with Energy Dispersive Analysis (SEM-EDAX) confirmed CuO nanoparticle formation. Brunauer-Emmett-Teller (BET) analysis indicated size reduction in templated CuO nanoparticles. Templated and non-templated CuO nanoparticles exhibited degradation efficiencies of 92% and 83%, respectively, against Crystal Violet dye under sunlight irradiation for 180 min. Minimum concentrations required for Escherichia coli were 75 mcg and 100 mcg for templated and non-templated CuO nanoparticles, respectively, while for Staphylococcus aureus, concentrations were below 25 mcg for both templated and non-templated CuO nanoparticles. This study demonstrates the efficacy of templated CuO nanoparticles synthesized through an eco-friendly route as both nano-photocatalysts and nano-antibiotics. © The Tunisian Chemical Society and Springer Nature Switzerland AG 2024.