Removal of Residual Chlorine from Water by Adsorption Using Apricot Shell Activated Carbon

Abstract

Apricot Shell Activated Carbon (ASAC) was examined for removal of residual chlorine in aqueous solution through the adsorption process. The effects of solution pH, agitation time, and initial concentrations were estimated. The results showed that the adsorption increased as the contact time increased and the initial concentration decreased, while the high adsorption was at pH=2. Langmuir, Freundlich and Temkin isotherm models were used for studying the adsorption equilibrium data. Adsorption data were fitted better with Freundlich isotherm, with a maximum monolayer adsorption capacity (q max) of 285.71 mg/g for Langmuir isotherm. The pseudo-first-order and pseudo-second-order equations were used for explaining the adsorption kinetics. The results were found to follow the pseudo-second-order model with correlation coefficients (R2) equal to 0.999. ASAC was shown to be a good adsorbent for removing residual chlorine from aqueous solutions at 25 °C.