Adsorption of reactive blue day 49 from aqueous solution on commercial activated carbon and polyaniline electrochemically deposited on carbon felt: Kinetic modeling and equilibrium isotherm analysis

Abstract

In this study, we investigated the effectiveness of commercially available activated carbon (CAC) and carbon felt (PANI/CF) for the removal of reactive blue dye 49 (RB49) from an aqueous solution. We performed a parametric analytical adsorption research in order to achieve this goal, looking at the impact of several important parameters like the adsorbent mass, the absorption duration, the concentration of ionic strength, and the pH of the RB49 solution. The measurement results demonstrate that the CAC dosage ranged from 0.1 to 5 g. The adsorption levels of RB49 increased from 17.73 % to 97.62 % and the PANI/CF assay from 0.228 to 1.044 g. The percentage of delayed adsorption of RB49 increased from 90.78 % to 99.97 %. It was found that the highest RB49 adsorption was obtained from pH < 7 for both adsorbents. The RB49 adsorption yield increased and then stabilized at equilibrium within 2 hours of contact. The kinetics of RB49 adsorption were determined using pseudo-first-order, pseudo-second-order and Elovich models. According to the experimental results, the pseudo-first order kinetic model proved to be the most suitable for the CAC adsorbent, while the three kinetic models were perfectly suitable for the PANI/CF adsorbent. The adsorption (parameters) isotherms of RB49 were studied using the Langmuir, Freundlich and Temkin models. The experimental data are more satisfactory and better fitted to the Langmuir model for the adsorption of RB49 on CAC and the second adsorbent CF/PANI; the results show that the adsorption studied is in agreement with the three isothermal models. The study shown that the organic dye RB49 may be successfully removed from aqueous solutions using CAC and PANI/CF as adsorbent materials.