THE KINETIC STUDY OF THE ADSORPTION OF 2-CHLOROPHENOL FROM AQUEOUS SOLUTION ONTO BONE CHAR

ABSTRACT

This study was carried out to investigate the kinetics of the removal of 2-Chlorophenol onto bone char, and optimize process parameters such as time, pH and concentration using batch experiments. The study involved the pyrolysis of cow bones to obtain the bone char adsorbent, the characterization of bone char sample by SEM/EDX, FT-IR, XRD and BET surface area which gave a specific surface area of 50.54m2 /g, batch sorption experiment to obtain kinetic parameters and the use of different kinetic models to treat the sorption data. The pseudo first order model, pseudo second order model and the Elovich models were used to analyze the experimental data. The best fit was determined to be the pseudo second order model from the correlation coefficient value of 0.9995 and the closeness of the calculated qe of 0.00114mol/g to the experimentally determined qe of 0.00116 mol/g. The initial rate of removal (h), rate of removal with time (k2) and the adsorbent equilibrium of bone char for 2-CP were calculated to be 0.00072 molg-1min-1 , 5.571×102 gmin-1mol-1 and 0.00114 molg-1 respectively from pseudo second order model. The removal of 2-Chlorophenol from aqueous solution using bone char was found to be dependent on time, pH and concentration. Optimum time of 40 minutes, optimum pH of 7 and optimum concentration of 0.09mol/l were obtained from the study.