STUDIES OF PROPERTIES OF COMPLEX CARBON-SILICA ADSORBENTS USED IN SORPTION-DESORPTION PROCESSES (SOLID-PHASE EXTRACTION)

Adsorption properties of carbon and carbon-silica adsorbents, prepared by n-octanol and glucose pyrolysis and catalytic decomposition of n-b utane, have been studied regarding their applicability for the extract ion and concentration of phenol, its nitro- and chloroderivatives and trihalomethanes [THM] from aqueous solutions in the concentration rang e of 2 to 20 mg/l. The adsorbents investigated have been subjected to various physico-chemical processes (hydrothermal treatment, oxidation, silanization) in order to improve their efficiency. The adsorption is otherms measured correspond well to the Freundlich equation. A good co rrelation have been observed between the values of the Freundlich cons tant k and the adsorbent efficiency. The investigation has been carrie d out using the ''off line'' method, and recovery rates for the compou nds studied as high as 40-100% have been obtained.