Langmuir isotherm model and implies that SC achieves monolayer adsorption of the dye. The maximum adsorption for MB adsorption from the Langmuir isotherm was 1.81 mg/g, similar to the value calculated from the Sips isotherm (1.82 mg/g), which at face value agrees with theory that Sips model reduces to the Langmuir model when n s equals unity. Similar isotherm results