Table 4 The Langmuir and Freundlich isotherm parameters for Cr(VI) adsorption with persulfate-modified AC (Agitation time 5 h, Temperature: 298.15 K, Speed: 150 rpm, Cr: 5–600 mg L−1, Adsorbent mass: 0.03 g, and Solution volume: 10 mL).

From: Intensification of Cr(VI) adsorption using activated carbon adsorbent modified with ammonium persulfate

Freundlich

Langmuir

R2

Kf (mg.g−1.mg−m.Lm)

n

R2

KL (L.mg−1)

qmax (mg.g−1)

0.8786

31.73

0.1368

0.984

0.1628

108.69

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