The adsorption of fulvic acids (FAs) on activated carbon (AC), which contain fractions of different molecular weight with various functional groups, is greatly affected by AC surface chemistry. The presence of oxygen-containing groups on the AC surface affects on the mechanism of interaction between sorbate and sorbent, changing the value of the free energy of adsorption, and creates prerequisites for the manifestation of catalytic properties of AC. The adsorption capacity of AC can be changed by modifying its surface by oxygen-containing groups.
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