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Beni-Suef University Journal of Basic and Applied Sciences

Table 5 Freundlich 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

n

KF ((mg/g)(L/mg)1/n)

Freundlich (R2)

FA

–

3.03

1.73

0.867

Na-GP

NaOH

4.22

16.81

0.866

K-GP

KOH

6.29

9.58

0.865

NaSil-GP

NaOH + Na2SiO3

2.44

14.74

0.973

KSil-GP

KOH + Na2SiO3

3.15

11.41

0.942

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