Faculty Publications
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Item Extraction of iron from laterite soil and green synthesis of laterite nano iron catalyst (GLaNICs) for its application as Fenton's catalyst in the degradation of triclosan(IWA Publishing, 2022) Rashmishree, K.N.; Bhaskar, S.; Shrihari, S.; Thalla, A.K.Laterite based nano iron particles were synthesized using natural laterite extract as a precursor and Psidium guajava plant extract for its application as Fenton's catalyst in the degradation of triclosan. Chemical digestion method was used for the extraction of iron from laterite soil. Synthesized nano iron catalyst was characterized using SEM-EDS, XRD and FTIR and evaluated for its catalytic application in the Fenton's oxidation of triclosan. Maximum triclosan degradation of 69.5% was observed with nano iron catalyst dosage of 0.1 g/L and hydrogen peroxide dosage of 200 mg/L at acidic pH of 3. Hydrogen peroxide influence on the process was observed with Fenton's oxidation. Role of iron in the process has been accessed by control experiment with no nano catalyst addition in which degradation is considerably low. Fenton's oxidation was compared with conventional Fenton's oxidation driven by a green nano iron catalyst. Study claims the usage of natural laterite iron as a replacement for commercial iron in Fenton's degradation of triclosan. Regeneration and reusability studies on catalyst were studied and synthesized catalyst was observed to be reusable in three consecutive cycles. Degradation of triclosan in Fenton's oxidation follows pseudo-second order reaction with linear fit. © 2022 The Authors.Item Green synthesis of granular activated carbon/zinc ferro nanocomposites-based bioleached laterite iron (BLaFe) for the removal of Rhodamine B in water using adsorption–Fenton’s oxidation process(IWA Publishing, 2023) Bhaskar, S.; Rashmishree, K.N.; Manu, B.; Sreenivasa, M.Y.Novel cost-effective catalyst granular activated carbon (GAC)-based zinc ferro nanocomposites for the heterogeneous Fenton’s oxidation of dye were synthesized using bioleached laterite iron (BLFe) as a precursor and Psidium gujava leaf extract. Synthesized nanocomposites were characterized using SEM, EDS, XRD and BET surface area analysis. The degradation of Rhodamine dye was carried out with nanocomposites using adsorption–Fenton’s oxidation process. The catalytic role of nano-composites in Fenton’s oxidation of Rhodamine B (RhB) was investigated and reported. The maximum dye removal of 96.2% was observed with 64.2% COD removal within 200 min of treatment. An increase in nanocomposite dosage has a positive effect on dye removal marking 5 g/L as an optimum dosage. Adsorption studies reveal that RhB removal using BLFe-based GAC/zinc ferro composites fits the Freundlich Adsorption Isotherm model with an adsorption capacity of 47.81 mg/g. A com-bination of adsorption and Fenton’s oxidation has resulted in higher removal efficiency with nanocomposite material. Reusability studies confirm that the spent catalyst can be reused for five cycles. © 2023 The Authors.Item 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.