however, those of the Freundlich isotherms are lower, indicating
that the adsorption of RR228 on CFSC obeys the Langmuir model
well compared to the Freundlich model. Moreover, all RL values are
in the range 0–1, which indicates that the adsorption of RR228 on
CFSC is favorable. The results also suggest that the uptake of RR228
occurs on the homogeneous surface of CFSC by monolayer adsorption
without interaction between the absorbed dye molecules.