Research Article

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

Figure 6

Nonlinear data fitting of isotherm models for Cu(II) and Zn(II) adsorption onto EFB and 2ACEFB under optimal condition for (a, b) a two-parameter model and for (c, d) three parameters.
(a)
(b)
(c)
(d)