Faculty Publications

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Author: search.filters.author.Manoj, A.Subject: search.filters.subject.Degradation

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    Non-ferrous Fenton’s Oxidation of Ametryn Using Bioleached E-waste Copper as a Catalyst
    (Springer Science and Business Media Deutschland GmbH, 2022) Bhaskar, S.; Manoj, A.; Manu, B.; Sreenivasa, M.Y.; Mudipu, V.
    Shake flask study on bioleaching of copper from e-waste using novel isolated bacterial strain Acidithiobacillus ferrooxidans BMSNITK17 was conducted and reported. Under suitable conditions, about 77% of copper was recovered. The process was optimized with several influencing parameters like pulp density, pH, inoculum, temperature, and shake flask speed. To find the vital variables that affect copper dissolution, correlation studies and principal component analysis (PCA) were performed. Investigation on the application of recovered copper as a catalyst in Fenton’s oxidation of ametryn proved the catalytic role of copper with 87% of ametryn degradation efficiency. This study confirms the usage potential of acidophilic bacterial strain toward recovery of valuable metals from e-waste and its application as a catalyst in advanced oxidation process for the degradation of organic pollutants. Graphical Abstract: [Figure not available: see fulltext.] © 2022, The Minerals, Metals & Materials Society.
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    Synthesis of plant-based biogenic jarosite nanoparticles using Azadirachta indica and Eucalyptus gunni leaf extracts and its application in Fenton degradation of dicamba
    (Editorial Office of Water Science and Engineering, 2024) Bhaskar, S.; Manu, B.; Sreenivasa, M.Y.; Manoj, A.
    Bio-jarosite, an iron mineral synthesized biologically using bacteria, is a substitute for iron catalysts in the Fenton oxidation of organic pollutants. Iron nanocatalysts have been widely used as Fenton catalysts because they have a larger surface area than ordinary catalysts, are highly recyclable, and can be treated efficiently. This study aimed to explore the catalytic properties of bio-jarosite iron nanoparticles synthesized with green methods using two distinct plant species: Azadirachta indica and Eucalyptus gunni. The focus was on the degradation of dicamba via Fenton oxidation. The synthesized nanoparticles exhibited different particle size, shape, surface area, and chemical composition characteristics. Both particles were effective in removing dicamba, with removal efficiencies of 96.8% for A. indica bio-jarosite iron nanoparticles (ABFeNPs) and 93.0% for E. gunni bio-jarosite iron nanoparticles (EBFeNPs) within 120 min of treatment. Increasing the catalyst dosage by 0.1 g/L resulted in 7.6% and 43.0% increases in the dicamba removal efficiency for EBFeNPs and ABFeNPs with rate constants of 0.025 min−1 and 0.023 min−1, respectively, confirming their catalytic roles. Additionally, the high efficiency of both catalysts was demonstrated through five consecutive cycles of linear pseudo-first-order Fenton oxidation reactions. © 2023 Hohai University