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    • Keywords


      Green synthesis; Centella asiatica; metal oxide nanocatalyst; methylene blue; work function.

    • Abstract


      In this work, biogenic ZnO and CuO nanoparticles were fabricated by adopting a complete green aqueous approach utilizing Centella asiatica plant extract. The phytochemicals involved in tailoring the nanoscopic metaloxide particles were characterized vividly. Both of the as-synthesized metal oxide particles are spherical and have a narrow size distribution with an average diameter of about 7 nm as measured via HRTEM. Interestingly, X-raydiffraction (XRD) pattern of ZnO nanoparticles displays the exposure of its (100) hexagonal facet. The ensuing ZnO and CuO nanoscale particles briskly enhanced the reduction of methylene blue, which was otherwise very slow. Thereaction follows first-order kinetics and the rate constants follow the order $k_{uncat} \lt k_{\rm ZnO \ NPs} \lt k_{\rm CuO \ NPs}$. The highercatalytic performance of copper oxide nanoparticles than zinc oxide nanoparticles is succinctly established on the basis of their difference in work function values optically.

    • Author Affiliations



      1. Department of Basic Sciences and Humanities, National Institute of Technology, Imphal 795001, India
    • Dates

  • Bulletin of Materials Science | News

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