Vinayagam, Ramesh and Raja, Selvaraj and Arivalagan, Pugazhendhi and Thivaharan, Varadavenkatesan (2020) Synthesis,characterizationandphotocatalyticdyedegradationcapabilityof Calliandrahaematocephala-mediatedzincoxidenanoflowers. Journal of Photochemistry and Photobiology B: Biology, 203. p. 111760. ISSN 1011-1344

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Abstract

An environmentally sound approach towards the green synthesis of zinc oxide nanostructures has been achieved with an aqueous extract of Calliandra haematocephala leaves. The nanoparticles were characterized using various analytical techniques to substantiate the structural details. An absorption band at 358 nm corresponds to the formation of zinc oxide nanoparticles. Scanning electron microscopy revealed the nanoflower morphology of the nanoparticles. Energy dispersivespectralanalysisportrayedthestrongpresenceofzincandoxygen, while X-ray diffraction showed the nanoparticles to conform to hexagonally-formed wurtzite structure. The crystallite size of the nanoflowers was estimated to be 19.45 nm. Vibrational frequencies, typical of zinc‑oxygen and other functional groups, were revealed using Fourier transform infrared spectroscopy. BET analysis revealed that the pores were of mesoporous nature with an estimated specific surface area of 9.18m2/g. The photo catalytic nature of the nanoparticles was established by the degradation of methylene blue(MB) dye, under solar radiation. Upto 88% degradation was achieved in a duration of 270 min. Kinetic data from the studies proved that the reaction was compliant with first-order model, with rate constant as 0.01 min−1. The study illustrated the synthesis of zin coxide nano particles using an ovel source, viz., the leaves of C. haematocephala

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