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Advances in Materials Research Volume 14, Number 3, June 2025 , pages 231-247 DOI: https://doi.org/10.12989/.2025.24.3.231 |
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Mn(II) ion adsorption using κ-carrageenan beads as a bio-based adsorbent |
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Syifabudi Chairurrizky, Muhammad Iqbal, Rusnadi and Muhammad Bachri Amran
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| Abstract | ||
| Carrageenan, an anionic polysaccharide commercially extracted from red algae, possesses ester sulphate functional groups, endowing it with significant potential as an adsorbent for heavy metal cations. This study investigates the efficacy of κ-carrageenan beads for the removal of manganese(II) ions from contaminated aqueous solutions, addressing the environmental concerns associated with elevated Mn(II) concentrations. κ-carrageenan beads were successfully synthesized from commercially available powder, and their adsorption capabilities were confirmed through Fourier Transform Infrared (FTIR) spectroscopy and Scanning Electron Microscopy (SEM). Adsorption parameters were systematically optimized, revealing optimal conditions at pH 3, a contact time of 120 minutes, and an adsorbent dosage of 0.1 g/100 mL. Kinetic study demonstrated that the adsorption process followed pseudo-second-order kinetics, while equilibrium data conformed to the Langmuir adsorption isotherm model, indicating monolayer adsorption. Furthermore, thermodynamic studies revealed that the adsorption of Mn(II) onto κ-carrageenan beads was an endothermic and spontaneous process. These findings can serve as a valuable reference for further applications of this material as a relatively low-cost, easy-to-prepare, yet effective bio-based adsorbent in reducing Mn(II) pollution levels in open waters. | ||
| Key Words | ||
| adsorption; hydrogel beads; κ-carrageenan; manganese ion | ||
| Address | ||
| Syifabudi Chairurrizky, Muhammad Iqbal, Rusnadi and Muhammad Bachri Amran: Analytical Chemistry Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha No. 10, Bandung, 40135, Jawa Barat, Indonesia | ||
