Determination of adsorption capacity and thermodynamic parameters of the PAC used for bomaplex red CR-L dye removal

Abstract

In this study, powder activated carbon (PAC) was used to remove Bomaplex Red CR-L dye from aqueous solutions. The influence of suspension pH, temperature, agitation rate, and the PAC dosage on Bomaplex Red CR-L dye removal and adsorption capacity was investigated by conducting a series of batch adsorption experiments. In addition, the mechanism of the dye removal was explained on the basis of the results of fourier transform infrared spectroscopy (FTIR). In order to gather information about adsorption mechanism at various pHs, electrophoretic mobilites of particles were measured. According to the BET (N2) measurements, the specific surface area of the PAC was found as 465 m(2)/g. The adsorption constants were defined according to Freundlich, Langmuir, BET and D-R isotherm models. The experimental adsorption data were fitted to Freundlich adsorption model (R-2 = 0.98). Thermodynamic parameters such as Delta H degrees, Delta S degrees and Delta G degrees were calculated from the slope and intercept of linear plot of log K-c against (I/T) x 1000. In this study, at the result of a 30 min reaction time, the max dye removal efficiency and adsorption capacity were obtained as 99% and 83 mg/g, respectively. (c) 2005 Elsevier B.V. All rights reserved.