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Author: search.filters.author.Bhaskar, B.Has files: No

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    Green synthesis of laterite iron-based nanocatalysts using Psidium guajava and Macaranga peltata plant extract for its catalytic application in Fenton’s oxidation of triclosan
    (Springer Science and Business Media Deutschland GmbH, 2024) Rashmishree, K.N.; Bhaskar, B.; Hari, S.S.; Thalla, A.K.
    Phytosynthesis of nanoiron catalysts was carried out using natural laterite extract as a precursor and Psidium guajava and Macaranga peltata leaf extract. Morphological, mineralogical and chemical characterization was done using SEM, XRD, EDS and FTIR. GL(Fe3O4)NCs were confirmed for their catalytic role in the degradation of triclosan via Fenton’s oxidation. Maximum triclosan degradation of 96.5% and 99.1% for GPsL(Fe3O4)NCs and GMpL(Fe3O4)NCs was observed at a catalyst dosage of 1.0 g/L and hydrogen peroxide dosage of 300 mg/L. A notable increase of 14.5% in the efficiency of contaminant removal was observed on increase in hydrogen peroxide with a rate constant doubled. Reusability studies for both catalysts were carried out for five consecutive cycles, and catalysts were shown to have efficient removal of triclosan in each case. The present study claims cost-effective treatment of triclosan with Fenton’s oxidation using green synthesized natural laterite iron catalyst for the degradation of triclosan in water. The degradation of triclosan in Fenton’s oxidation follows a pseudo-first-order reaction with a linear fit. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2023, corrected publication 2023.
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    Adsorption – Advanced oxidation process (AAOP) for the heavy metals and organic matter removal from leachate using combined filtration -Fenton's and Photo-Fenton's treatment
    (Academic Press, 2024) Bhaskar, B.; Shree K N, R.; Apoorva, A.; Marikunte Yanjarappa, S.
    Design of cost – effective filtration unit was carried out to evaluate the efficiency of different filter media made of locally available materials to treat raw leachate. Four different filter media laterites, peat, bagasse and a mixture of all were considered as study filter media for the removal of Zinc, Nickel, Copper and Lead from raw leachate. The reactor exhibited a significant removal efficiency when the three-filter media were combined as a combination. A removal rate of around 83.0% and 64.12% was found for nickel and copper, respectively, with a combined filter medium. The order of heavy metal removal varied depending on the kind of filter media used. For combined filter media, the sequence was Ni > Cu > Pb > Zn. For bagasse filter media, it was Pb > Cu > Zn > Ni. For peat filter media, it was Ni > Cu > Pb > Zn. For laterite filter media, it was Zn > Cu > Ni > Pb. Insignificant removal of heavy metals was observed with bagasse in the current investigation and hence is not recommended for use as a filter medium. Pre-treated leachate was subjected to Fenton's oxidation and UV-Fenton's oxidation for organic matter removal. Green synthesized bleached laterite iron nanoparticles were used as a catalyst in the Fenton treatment. COD removal of 80.0% and 85.0% was observed with 0.5 g/L of nano iron catalyst and 500 mg/L of H2O2 and 100 mg/L of H2O2 on Fenton's oxidation and UV-Fenton's oxidation respectively. The synthesized particles were demonstrated to possess a catalytic function in the reduction of COD. Both Fenton's oxidation and UV-Fenton's oxidation exhibit pseudo-first-order kinetics with linear regression. © 2024 Elsevier Ltd