Adsorption of Cationic Dyes by Waste Biomass Treated by Phosphoric Acid

This work investigated the capacity of the moroccan date pits (tmdp) (treated by phosphoric acid) to adsorb methylene blue (mb) from aqueous solution. the performance of tmdp was characterized by proximate analysis, n_2 adsorptiondesorption isotherms, sem, xrd and ftir. the equilibrium studies are carried out under a large range of mb concentration (from 60 to 400 mg/l) using 200 mg of the adsorbent at room temperature and ph 8. the efficiency of the adsorption tests are evaluated by the langmuir and freundlich isotherm models. equilibrium data fitted well by langmuir model with a maximum of the adsorption capacity of 106 mg/g, equivalent to 99% of removal. the pseudo-second-order model described better the adsorption process. tmdp has shown promising results for mb adsorption. this material will be tested for other industrial dyes in our future works.