Preparation, Characterization, and Application of Metakaolin-Based Geopolymer for Removal of Methylene Blue from Aqueous Solution

Figure 10

Langmuir (a), Freundlich (b), Temkin (c), and Dubinin–Radushkevich (d) isotherms for adsorption of MB by geopolymer.

(a)

(b)

(c)

(d)