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Table 4 Freundlich 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 KF ± SD [mmol1 – n Ln kg−1] n ± SD
4 0.61 0.912 9.33 ± 0.78 0.30 ± 0.03
7 0.11 0.965 7.48 ± 0.77 0.23 ± 0.03
9 0.67 0.962 1.20 ± 0.25 0.78 ± 0.04
12 2.56 0.908 2.91 ± 0.36 0.70 ± 0.03
  1. KF, Freundlich constant; n, Freundlich exponent; SD, standard deviation; χ2/DoF, probability distribution normalized to the number of data points; r2, determination coefficient