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Adsorption of methylene blue by the sieved biomass of Cicer arientinum isconducted in batch mode. The effect of different parameters such as contact time,sorbent dose, pH, and temperature has been studied. The adsorption risessubstantially as pH is increased from 2 to 4, and then with the increase to pH 10,there is slight decrease in the percentage of adsorption. This may be due to theelectrostatic forces of attraction between [MB]+ cations and theOH- ions which are greater at low pH in the solution. In the highlyacidic medium, there are an ample number of H+ ions. These can neutralizethe negative sites on biosorbent surfaces, leading to a lesser adsorption. TheLangmuir model fit and Hall separation values indicate favorable adsorption.Thermodynamic parameters via KD and ?G have also been calculated: the?G value at 15?C is -943 J/mole, while at 45?C, the value of ?Gis -4,010 J/mole. At the higher concentration, KD values decrease and the ?G valuesbecome positive in the same temperature range, indicating the spontaneity of theprocess. Kinetics of biosorption results shows that the sorption process is wellexplained by a pseudo-second-order model with determination coefficients of 0.4841 to0.9962 for S-II under all experimental conditions. The sorption mechanism wasdetermined by the Weber and Morris intraparticle diffusion model. For the initialconcentration of 79.9 mg/L and material dose of 500 mg/L, the value of Kid and theintercept was found to be 4.359 and 22.557, respectively, indicating that the foundrylayer is sufficiently thick. The low-cost, easily available agro-waste of C.arientinum was found to be a good adsorbent for the methylene blue dye.

Evaluation of sieved biomass of Cicer arientinum (horse bean) for removal ofmethylene blue: batch study