Resumen:
Activated carbons were synthesized by FeCl3-activation of Tara gum at different temperatures (400–1000 °C).
The activating agent and the precursor were physically mixed at different ratios (r= FeCl3:precursor,
0.5–3.0 wt). At r=2 and 800 °C the most developed porosity was achieved, with a BET surface area of
1680 m2·g-1 and a pore volume near 1 cm3·g-1, corresponding mostly to micropores (˜75%). The carbons were
fully characterized and tested for the aqueous-phase adsorption of antipyrine, used as model emerging pollutant.
The kinetic curves and adsorption isotherms at 20, 40 and 60 °C were obtained, which fitted well to hyperbolic
and Langmuir equations, respectively. At 20 °C, the saturation adsorption capacity was around 275 mg·g-1 AC.
The free energy of adsorption varied from -40.2 to -35.7 kJ·mol-1, while values close to -3 kJ·mol-1 and
112 J·mol-1·K-1, were obtained for the enthalpy and entropy of adsorption, respectively.