Removal of mixture of phenolic compounds from aqueous solution by tire char adsorption

Abstract

The article presents the results of the pyrolysis products from waste tires. Pyrolysis was meted out at (400-800°C) for 2 hr in absence of oxygen. The yield of char range from (0.479 - 0.3104). By chemical treatment of char with NaOH solution the modified char was produced. The physical and chemical properties were studied (optimum temperature, proximate analysis and Boehm titration for surface functional groups) for original and modified chars. Isotherm for pure and multicomponent system for three components (phenol, 4-aminophenol and 4-chlorophenol) were studied. The Langmuir and Freundlich models were used to describe the sorption of phenolic compounds for single-solute isotherms and the modified extended Langmuir and extended Freundlich gave information results for competitive system. Langmuir model was the best fit for experimental results. The capability of the studied char to adsorb phenols were in the order: 4-chlorophenol > 4-aminophenol > phenol.