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Table 4 Langmuir model adsorption isotherm parameters for Cu2+ [104]

From: Fly ash-based geopolymers: an emerging sustainable solution for heavy metal remediation from aqueous medium

Samples

Alkali activation

Adsorption capacity

qmax (mg/g)

KL (L/mg)

Langmuir (R2)

FA

–

7

0.14

0.990

Na-GP

NaOH

30

3.18

0.992

K-GP

KOH

16

4.11

0.991

NaSil-GP

NaOH + Na2SiO3

40

0.69

0.994

KSil-GP

KOH + Na2SiO3

28

0.76

0.993