| Abstrakt: |
This research paper analyses the adsorbent properties of a unique biomass i.e. horse chestnut shell (Aesculus hippocastanum L) activated carbon synthesized by chemical activation of KOH produced under optimized carbonization conditions for Fe3+. Research was done to look into the characteristics of the made activated carbon and its systematic effects of process parameters. Characterizations like SEM, BET, FTIR, XRD, TGA, EDX, proximate and ultimate analysis, calorific value was performed. Also effect of process parameters like initial Fe3+ ion content, contact time, dosage and temperature of system was studied for mechanism of adsorption at pH (6) of Fe3+ in an aqueous solution. Data on equilibrium and kinetic isotherms from experiments were examined, for kinetics pseudo 1st order reaction, pseudo 2nd order reaction and intraparticle diffusion has been utilised. System was fairly fitted by pseudo-2nd-order reaction. Adsorption isotherms such as Halsey, Harkin Jura, Temkin, Freundlich, and Langmuir and Dubinin Radushkevich were used and Langmuir adsorption isotherm turned out best suitable match as R2 value was found out to be 0.99. The maximum Fe3+ adsorbing ability of the HCAC4 was 138.88 mg/g at 25 °C. Thermodynamical evaluation concluded the process to be spontaneous and heat-releasing. Highlights: Horse chestnut shell biomass was converted to activated carbon using KOH activation. Characterization (SEM, BET, FTIR, XRD, TGA, EDX) revealed favourable structural and compositional properties. Investigated effects of Fe3+ ion content, contact time, dosage, and temperature, achieving 138.88 mg/g adsorption at 25 °C. Pseudo-second-order kinetic model and Langmuir isotherm (R² = 0.99) best described the adsorption process. The process was spontaneous and exothermic, showing high potential for Fe3+ removal in water treatment. [ABSTRACT FROM AUTHOR] |
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