<![CDATA[This study aims to synthesize banana stem-based activated carbon through chemical activation using HCl and NaOH at concentrations of 0.5 M and 1 M and activation times of 2 and 4 hours. FT-IR spectra identified –OH, C=O, aromatic C=C, and C–O functional groups in all samples, indicating the potential of banana stems as a raw material for activated carbon, with HCl activation yielding more optimal characteristics. SEM characterization showed that increasing the concentration and activation time resulted in a more porous structure with particle sizes of 0.98–1.63 µm, with the smallest size obtained using 1 M HCl for 4 hours. EDX analysis revealed a dominance of C and O elements, with the highest carbon content of 52.71% (atomic) in 1 M HCl. Moisture content ranged from 1.68–3.13% and met SNI No. 06-3730-1995. Ash content in the HCl treatment was 10%, meeting the standard, while in the NaOH treatment it was 20%. The Pb adsorption test showed the highest efficiency in 1 M HCl at 72.50%, higher than that of NaOH, which decreased to 49.00%. ]]>
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