Adsorption of Cu(II) and Zn(II) onto Activated Carbon from Oil Palm Empty Fruit Bunch Prepared by Two-Step Acid Treatment and Microwave-Assisted Pyrolysis

Table 4

Expression of two-parameter and three-parameter isotherm models.

Isotherm model	Nonlinear form	Linearized form	Model parameters
Two-parameter model
Langmuir			,
Freundlich			,
Temkin			,
Three-parameter model
Redlich-Peterson		—	, ,
Sips model		—	, ,
Toth model		—	, ,