Romanian Journal of Ecology & Environmental Chemistry
Absorption of methylene blue from aqueous solutions on activated coal CAN-9: kinetics and equilibrium studies
Authors: TUDOR LUPASCU, MIHAIL CIOBANU, ELENA CULIGHIN
Keywords: Methylene blue, activated carbon, adsorption kinetics, adsorption in static conditions
https://doi.org/10.21698/rjeec.2022.102The adsorption of methylene blue and the kinetics of adsorption of aqueous solutions on activated carbon CAN-9, obtained from walnut shells by chemical activation with orthophosphoric acid were studied. It has been shown that the adsorption isotherm of methylene blue from aqueous solutions on CAN-9 in the linear coordinates of the Langmuir model is a straight line (R = 0.99427) and is of the Langmuir type. The kinetics of adsorption of methylene blue on CAN-9, measured at two initial concentrations, showed an increase in Kint and C values with the increase of the initial concentrations. The process of intra-particular diffusion occurs in only one stage and takes place in the mesopores.
