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Mahfud, Mahfud -
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Adsorption behavior of Cu(II) on microwave-activated lemongrass-derived carbon: isotherm and kinetic modeling Ni'mah, Lailan -; Mahfud, Mahfud -; Juliastuti, Sri Rachmania; Muis, Ramdiana -
Konversi Vol 15, No 1 (2026): APRIL 2026
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v15i1.25556

Abstract

This study evaluates the adsorption performance, equilibrium behavior, and kinetic properties of Cu ions using microwave-activated carbon derived from lemongrass for acid mine drainage treatment. The precursor was carbonized at 300 °C for 2 h and subsequently activated under microwave irradiation to enhance its physicochemical properties. Batch experiments were conducted with adsorbent dosages of 2–7 g and a fixed contact time of 60 min, and the remaining Cu concentration was measured by atomic absorption spectrophotometry. An optimal dosage of 4 g achieved the highest removal efficiency of 54.18%. Equilibrium data were analyzed using the Langmuir and Freundlich isotherm models, with the Langmuir model providing a better fit, yielding a maximum adsorption capacity (qmax) of 3.60 mg/g, a Langmuir constant (KL) of 43,27 mol/L, and an R² of 0,9825, compared with KF 3,46 and an R² of 0,9677 for the Freundlich model. These findings indicate predominantly monolayer adsorption on homogeneous sites and kinetics consistent with a pseudo first order model.
Co-Authors Muis, Ramdiana - Ni'mah, Lailan - Sri Rachmania Juliastuti, Sri Rachmania