The adsorption of Cr (VI) from aqueous solution by natural materials

This study deals with the adsorption of chromium (vi) from the new natural materials from morocco. the adsorbents used are characterized by different physic-chemical techniques: x-ray fluorescence spectrometry,x-ray diffraction (xrd),fourier transform infrared spectroscopy (ftir). the effects of initial concentration of cr (vi) ion,temperature,amount of adsorbent and ph of the solution on adsorption have been investigated. optimum conditions for adsorption were determined as initial concentration of 100 mg/l,adsorbent dose=2g,and ph=2,by using the results of these experiments and an additional set of experiments was performed under these optimum conditions in order to see the change in the adsorption efficiency. removal of chromium ion was found as highly dependent on ph and initial cr (vi) concentration of the solution. the adsorption isotherms obey the langmuir equation was obtained a maximum adsorption capacity of 15.67 mg/g and 14.43 mg/g,for the material ks and pn respectively. although experimental data confirm with both langmuir and freundlich isotherm models. the results of this study confirm that these materials can be considered effective adsorbents for the removal of chromium (vi).