Resumen
The feasibility of using pineapple peels as biosorbent for Fe(II) ions removal from aqueous solution was investigated. The synthesized adsorbent was characterized and the effect of contact time, pH, adsorbent dosage, and initial concentration of Fe(II) ions on the adsorption of Fe(II) ions on pineapple peels were investigated. The adsorbent from pineapple peels were prepared through chemical activation. The influence of contact time (30, 60, 90, 120, 150, 180, 210, 240, 270, and 300 min), pH (2, 4, 6, 8, and 10), adsorbent dosage (0.5, 1.0, 1.5, 2.0, and 2.5 g), and initial concentration of Fe(II) ions (5, 10, 15, 20, and 25 mg/L) were evaluated. The SEM images confirm that raw pineapple peel had a distinctly smooth surface and an irregular cylindrical structure and the surface of pineapple peel activated carbon was rough, which increased the surface area of the activated carbon. The BET surface area (SBET) of raw pineapple peel and pineapple peel activated carbon was 7.9348 and 917.8225 m2/g, respectively. The percentage removal of Fe(II) ions increased with increasing contact time and equilibrium was attained at 60 min. The maximum removal of Fe(II) ions was observed at pH 10. Increasing the adsorbent dosage from 0.5 to 2.5 g gradually increased the Fe(II) ions uptake. The reduction in initial concentration of Fe(II) ions significantly increased the percentage removal of Fe(II) ions from aqueous solution. The adsorption kinetic was found to follow the pseudo-second order kinetic model. The experimental data coincided well with the Langmuir model, which suggests monolayer coverage on the adsorbent and the maximum adsorption capacity was 10.4384 mg/g. The results show that activated carbon prepared from pineapple peel can be an effective biosorbent for Fe(II) ions removal from aqueous solution.