Lupascu, TudorTudorLupascuCiobanu, MihailMihailCiobanuCulighin, ElenaElenaCulighin2022-08-112022-08-112022-06http://hdl.handle.net/123456789/1853Romanian Journal of Ecology & Environmental Chemistry, vol. 4, no. 1, 2022, 22-28, https://doi.org/10.21698/rjeec.2022.102The adsorption of methylene blue and kinetics of its adsorption from aqueous solutions on activated carbon CAN-9, obtained from walnut shells by chemical activation with orthophosphoric acid were studied. It has been shown that methylene blue adsorption isotherm from aqueous solutions on CAN-9 in the linear coordinates of the Langmuir model is a straight line (R = 0.99427) and is of Langmuir type. The kinetics of methylene blue adsorption 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.enMethylene blueActivated carbonAdsorption kineticsAdsorption in static conditionsresearch article10.21698/rjeec.2022.102