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Adsorption of Humic Substances onto Kaolin Clay Related to Their Structural Features

^a Dep. of Remediation Res., Centre for Environm. Res., Leipzig-Halle GmbH, Permoserstr. 15, D-04318 Leipzig., Germany
^b Dep. of Chemistry, Lomonosov Moscow State Univ., Leninskie Gory, 119899 Moscow, Russia
^c Univ. of Karlsruhe, Engler-Bunte Inst., Engler-Bunte-Ring 1, D-76131 Karlsruhe, Germany

View larger version (24K): [in a new window]   Fig. 1. Adsorption-desorption isotherms of humic substance (HS) of different origin onto Na-kaolin clay.

View larger version (60K): [in a new window]   Fig. 2. Three-dimensional visualization of maximum organic C sorption (b) of 11 humic substances on kaolin clay—comparison between measured (black dots) and predicted values (plane) from humic surface charge (Z) and average molecular weight (MW) according to Eq. [3].