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Vol. 37 No. 10 (2025): Vol 37 Issue 10, 2025

Copyright (c) 2025 Muhammad Yuspriyanto, Nelly Wahyuni, Anis Shofiyani

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This work is licensed under a Creative Commons Attribution 4.0 International License.

Adsorption of Cd(II) and Cr(III) Ions using Magnetic Activated Carbon Derived from Plajau Wood (Pentaspadon motleyi)

https://doi.org/10.14233/ajchem.2025.34338
Muhammad Yuspriyannto
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Tanjungpura University, Pontianak, Indonesia
Nelly Wahyuni
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Tanjungpura University, Pontianak, Indonesia
https://orcid.org/0000-0002-4439-0990
Anis Shofiyani
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Tanjungpura University, Pontianak, Indonesia
https://orcid.org/0000-0002-5060-8351

Corresponding Author(s) : Nelly Wahyuni

nellywahyuni@chemistry.untan.ac.id

Asian Journal of Chemistry, Vol. 37 No. 10 (2025): Vol 37 Issue 10, 2025

Abstract

This study investigates the adsorption behaviour of Cd2+ and Cr3+ ions from aqueous solutions using magnetic activated carbon (MAC) synthesized from Plajau wood (P. motleyi). Magnetic activated carbon was synthesized by compositing activated carbon with magnetite (Fe3O4), using a Fe3+/Fe2+ mixture in a 2:1 molar ratio. The formation of Fe3O4 on the carbon surface introduced new active sites and modified the pore structure of the activated carbon. Infrared spectra show the presence of magnetite in infrared absorption at 570 cm–1, SEM-EDX analysis shows magnetite on the surface with oxide compound 6.8% and the XRD diffractogram confirms the suitability of magnetite. The optimum adsorption of Cd2+ and Cr3+ was achieved at pH 6 and 7, adsorbent doses of 0.04 g and 0.06 g, stirring speed of 150 rpm, contact times of 3 and 4 h and an initial concentration of 50 ppm, yielding maximum adsorption capacities of 48.36 mg/g and 39.27 mg/g, respectively. Adsorption of Cd2+ ion follows the Langmuir isotherm model (R2 = 0.9123) and pseudo-second order kinetic model (R2 = 0.9110). Meanwhile, the Cr3+ ion follows the Redlich-Peterson isotherm model (R2 = 0.9475) and pseudo-second order kinetic model (R2 = 0.9983). The efficiency of magnetic activated carbon recovery after adsorption was 81.18% indicating good magnetic responsiveness and potential for reuse with minimal material loss.

Keywords

Adsorption behaviour Isotherms Magnetite Heavy metal ions Plajau wood
(1)
Yuspriyannto, M.; Wahyuni, N.; Shofiyani, A. Adsorption of Cd(II) and Cr(III) Ions Using Magnetic Activated Carbon Derived from Plajau Wood (Pentaspadon Motleyi). ajc 2025, 37, 2415-2425.
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