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Environmental Sciences Europe

Table 3 Two-site Langmuir isotherm fitting parameters for sorption of gluconic acid on gibbsite at various pH values

From: Adsorption of aliphatic polyhydroxy carboxylic acids on gibbsite: pH dependency and importance of adsorbate structure

pH

χ2/DoF

r 2

KL1 ± SD L mmol−1

Csat1 ± SD mmol kg−1

KL2 ± SD L mmol−1

Csat2 ± SD mmol kg−1

4

0.674

0.912

51 ± 51

6.4 ± 1.5

0.069 ± 0.032

33 ± 5

7

0.072

0.979

48 ± 76

6.0 ± 1.8

0.053 ± 0.045

19 ± 5

9

0.362

0.981

63 ± 111

1.57 ± 0.57

0.0015 ± 0.0009

325 ± 149

12

2.40

0.920

3.70 ± 2.05

2.05 ± 1.91

0.0038 ± 0.0012

274 ± 57

  1. X2/DoF, probability distribution normalized to the number of data points; r2, determination coefficient; KL, Langmuir affinity constant (1: “high”, 2: “low” affinity sites); Csat, saturation concentration; SD, standard deviation
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