The dimensionless separation factor of Langmuir isotherm (RL) is an important parameter which indicates if the adsorption process is favorable (0 < RL < 1), linear (RL = 1), unfavorable (RL > 1), or irreversible (RL = 0) [22].
The dimensionless separation factor of Langmuir isotherm (RL) is an important parameter which indicatesif the adsorption process is favorable (0 < RL < 1), linear (RL = 1),unfavorable (RL > 1), or irreversible (RL = 0) [22].