synthesis of sodium alginate-derived carbon aerogel for adsorptive removal of methylene blue

In this study, carbon aerogel was prepared from sodium alginate via the sol-gel technique. the morphological study clearly revealed that the synthesized aerogel possessed a highly porous structure with a specific surface area of 470 m2/g. the applicability of the aerogel as an adsorbent was examined in methylene blue removal. adsorption isotherms, kinetics, and thermodynamic studies of removal of mb from aqueous solutions were conducted in a batch system. the effect of ph and adsorbent dosage on the adsorption of mb was investigated. the equilibrium data were best fitted to langmuir model with a maximum adsorption capacity of 70.42 mg/g. the adsorption kinetics of mb followed the pseudo-first-order models. thermodynamic analysis of the results indicated that adsorption is a physical process and is in agreement with data obtained from the dubinin−radushkevich isotherm model. the removal of the mb process was spontaneous and endothermic.