A Zehra Aroguz - Istanbul University, Engineering Faculty, Chemistry Department, Avcilar Istanbul -TURKEY
D Dalgin Akcay - Istanbul University, Engineering Faculty, Chemistry Department, Avcilar Istanbul -TURKEY
Jinous Rahimpour - Istanbul University, Engineering Faculty, Chemistry Department, Avcilar Istanbul -TURKEY
H Can Morel - Istanbul University, Engineering Faculty, Chemistry Department, Avcilar Istanbul -TURKEY

Peat Moss Sphagnum pyrolyzed at 800ºC was used as an adsorbent for the adsorption of organophosphate insecticide, azinphos-methyl in a batch system. The adsorption parameters; contact time, adsorption temperature and initial concentration of the adsorbate were examined to investigate their effect on the adsorption process. The adsorption properties have been compared with respect to their capacity to remove azinphos-methyl from aqueous solution. The experimental data were analyzed using the adsorption kinetic model, of which a pseudo-first order and second order kinetic model. The pseudo-first order kinetic was found to be the best fit. The results indicate that the adsorption is spontaneous and favorable. Experimental equilibrium data were applied to the Freundlich isotherm. The calculated activation energy showed that the adsorption of azinphos-methyl onto pyrolyzed peat moss is a physical adsorption.

adsorption, azinphos-methyl, adsorption isotherm, moss, pyrolyzed