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

• DOI: 10.2136/sssaj2002.1805
• Publication Date: 2010-07-27T22:02:14Z
• Authors: Gerd U. Balcke; Natalia A. Kulikova; Sebastian Hesse; Frank-Dieter Kopinke; Irina V. Perminova; Fritz H. Frimmel
• Keywords: Hysteresis

Eleven well characterized humic substances (HSs) were adsorbed from aqueous solution onto a Na‐kaolin clay. The adsorption affinity ( K L ), maximum capacity b coefficient of desorption hysteresis H and the concentration irreversibly HS (IHS) derived adsorption‐desorption isotherms. These parameters correlated with structural features HS. was shown to correlate directly aromaticity inversely their polarity, expressed as O/C atomic ratio. A dependency between polarity not confirmed. , IHS expose close correlation molecular weight (MW) partial negative charge Z ) at operating pH value. following quantitative relationship obtained: = 715 − 0.06 × MW 529 r 0.92). It allows selection respect largest content organic matter in HS‐kaolin clay complexes. Among studied high materials enriched C‐ H‐substituted aromatics, such coal peat acids (HAs), are be most preferential for preparing stable HS‐clay