EVALUATION OF THE ADSORPTION OF Pb2+ IONS IN AQUEOUS SOLUTION ON ACTIVATED PEAT MATERIAL

Abstract

In this study, peat was activated with H3PO4 at a concentration of 2.0 M and dried at 105oC for 6 hours.
The samples after synthesis are characterized by several methods such as EDX, XRD, SEM, BET and
FTIR. The adsorption properties of the materials were evaluated through the removal of Pb2+ ions in
aqueous solution. Material characteristics showed that the activated peat sample had a higher specific
surface area and porosity than the raw peat sample. The study showed that the experimental data of Pb2+
ion adsorption on activated peat were well described according to both Langmuir and Freundlich
isotherm models, however, the Langmuir isotherm model was more suitable. The activated peat material
had a maximum adsorption capacity qm = 33.33 mg/g. In addition, the study also showed that the
adsorption of Pb2+ ions on activated peat follows the pseudo-second-order model. From the above
research results, it shows that the adsorbent material from peat has great potential in remove heavy metal
ions in aqueous solution.