Faculty Publications
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Item Influence of Ferrous Iron Addition on Silver Catalyzed Bioleaching of Copper from Chalcopyrite using an Isolated Acidithiobacillus Ferrooxidans Strain(Grenze Scientific Society, 2023) Bhaskar, S.; Manoj, A.; Nayak, D.M.; Furtado, I.M.; Anchan, D.; Wazir, A.M.Shake flask studies on influence of initial ferrous iron on bioleaching of copper from chalcopyrite using novel isolated bacterial strain Acidithiobacillus ferrooxidans BMSNITK17 with and without addition of silver catalyst was conducted and reported. Non-catalysed bioleaching of copper yields about 0.9 g/L of with 16 g/L of initial ferrous iron concentration while Silver catalysed bioleaching of copper from chalcopyrite yields about 1.6 g/L of copper with initial ferrous iron concentration of 4 g/L. Variation of pH, ferrous and ferric iron during the study were recorded and discussed. This study confirms the influence of initial ferrous iron concentration on bioleaching of copper. © Grenze Scientific Society, 2023.Item 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.Item 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 UniversityItem Impact of sulfate supplement on bioleaching of iron from fly ash residue using isolated Acidithiobacillus ferrooxidans strain: A Box-Behnken process optimisation(Korean Society of Environmental Engineers, 2025) Bhaskar, S.; Apoorva, K.V.; Ashraf, S.; Shruthi, R.; Manoj, A.Fly ash, a residue from coal combustion contains significant iron content (10-40%), has potential applications in various fields. Present study investigated the impact of sulfate on bioleaching of iron from fly ash, using a novel Acidithiobacillus ferrooxidans strain. Iron dissolution obtained was 95.5 mg/L with 100 rpm shake flask speed, 3% pulp density, pH 3.0, and 5.5 g/L sulphate supplement, compared to 74.5 mg/L without sulphate over 15 days. The study employed Box-Behnken design for Design of Experiments. Variables ranged from 50 rpm – 150 rpm for shake flask speed, 2.5 – 3.5 for pH, 1% – 5% for pulp density, and 1.0 g/L – 10 g/L for sulfate concentration. In the experiment with sulfate supplement, the concentration of sulfate was treated as a variable parameter, as opposed to the pulp density, while taking into account other relevant characteristics. Iron dissolution was taken as a response. Pulp density and sulfate concentration significantly affected iron dissolution. A quadratic regression model was fit and an ANOVA was performed. According to the model, sulfate concentration has a positive linear influence with sulfate supplement, while for no sulfate supplement, shake flask speed and pulp density have a positive effect on the bioleaching of iron from fly ash. © 2025 Korean Society of Environmental Engineers.