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In this study, magnetic characteristic was added to activated carbon (AC) obtained by ZnCl₂ activation of acorn shell. The produced magnetic AC (Fe-AC) was used effectively for the removal of methylene blue (MB) from aqueous solution. The effects of different batch parameters such as adsorbent dosage (0.05–0.2 g/100 mL), initial pH (3–9), temperature (298–318 K), initial dyestuff concentration (50–250 mg/L) and contact time (5–60 min) on the adsorption process were examined. The structural and chemical characterization of the synthesized AC and Fe-AC adsorbents were carried out by using various analytical techniques such as XRD, SEM/EDS, FT-IR and BET analysis techniques. The MB concentration in the solution was determined by UV–VIS spectrophotometer. From the Langmuir isotherm model, the maximum adsorption capacity was found as 330.0 and 357.1 mg/g for AC and Fe-AC adsorbents at 298 …