removal of dye (blue 56) from aqueous solution via adsorption onto pistachio shell: kinetic and isotherm study of removal process

in the present investigation, shells of pistachio are used as adsorbents and they have been successfully used for the removal of blue 56, from water samples. the effect of various parameters such as: ph, amounts of adsorbents, size of adsorbent particles and contact time on removal processing were investigated. in this study freundlich absorption isotherms and langmuir were investigated . the experimental data were correlated reasonably well by the freundlich adsorption isotherm and isotherm parameters were calculated. in order to investigate the efficiency of blue 56 adsorption on the pistachio shell, pseudo-first-order, pseudo-second-order, elovich and intra-particle diffusion kinetic models were studied . the model that had good correlation to attract freundlich was chosen as the model . its kinetics follows the pseudo second order reaction .