Sorption-spectrometric determination of phenolic antioxidants in water
Abstract
The adsorption and desorption of phenolic antioxidants (PA) from aqueous solutions on BAU-A activated carbon was studied. In accordance with the theory of micropore volumetric filling (TMVF), a special mechanism of adsorption of phenolic antioxidants (phenol, cresols, ionol, hydroxyphenols) in the micropores of BAU-A AC can be revealed; during the adsorption process, the filling of the volume of the pores rather than coverage of the surface of the pores occurs. The TMVF theory (modified Dubinin-Radushkevich equation) and the monomolecular adsorption theory (MAT) (Langmuir equation) were used to describe the absorption processes of phenolic antioxidants on BAU-A AU. Based on the dependences obtained, the constants of adsorption equilibrium and monolayer capacitance were calculated.
PA were practically not desorbed under static conditions; therefore, their desorption from BAU-A AC was carried out under dynamic conditions. The resulting PA desorption diagrams showed that when a binary mixture of water-ethanol, water-acetonitrile, and methanol was used as an eluent, the yield of phenols was 78-85%, and the elution time was 30 min.
Based on the experimental data, a sorption-spectrometric method for the determination of PA in purified waste water was proposed. The developed technique for the sorption-spectrometric determination of PA is characterized by the following parameters: the duration of a single analysis was 45-60 min, the detection limit was 0.1 MPC of the “phenol index”.
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