Resumen

DOBROSZ-GOMEZ, Izabela; GOMEZ, Miguel-Ángel  y  SANTA, Camilo. Optimization of the Cr(VI) Adsorption Process on Bituminous Activated Carbon. Inf. tecnol. [online]. 2018, vol.29, n.6, pp.43-56. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642018000600043.

The potential application of an activated carbon, of bituminous origin, as an adsorbent of Cr(VI) in aqueous solution was studied. The response surface methodology was used as a tool to optimize some of the operating conditions of adsorption process (temperature, pH and adsorbent dose) using as a criterion Cr(VI) removal percentage (%RCr). The following optimal conditions were found: pH equaled to 2, temperature of 40°C and adsorbent dose of 6 g.L-1. The %Rcr obtained experimentally was 100%. Activated carbon showed a high adsorption capacity (16,53 mg.g-1), reaching equilibrium adsorption in less than 60 minutes. The thermodynamic parameters (ΔH° = 65.05 kJ.mol-1, ΔS° = 0.2446 kJ.mol-1 and -6.664 (at 293 K) ( ΔG° ( -11.557 (at 313 K)) indicated the endothermic and spontaneous nature of adsorption. Cr(VI) adsorption mechanism was interpreted as chemisorption on the basis of high value of enthalpy. The adsorption process followed a pseudo-second kinetic model and obeyed the Langmuir isotherm model.

Palabras clave : adsorption; bituminous activated carbon; response surface methodology; Cr(VI).

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