Inquiry into Interaction of Nuclear Particles and Monocrystals

Available from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio

High-Performance Liquid Chromatography as Physico-Chemical Method for Study of Adsorption from Solutions

High-Performance liquid chromatography (HPLC) of anisole and benzaldehyde on macroporous silica (Silochrom C80) with a hydroxylated surface and a surface covered with polyoxyethylene (POE) monolayer have been studied. On the basis of data obtained from liquid adsorption chromatography the adsorption isotherms of aromatic compounds from solutions were calculated. It has been found that adsorption isotherms obtained by HPLC and static adsorption methods coincide for anisole adsorbed either on hydroxylated or modified surfaces. In the case of benzaldehyde adsorption on hydroxylated silica surface the adsorption values obtained by the chromatographic method are smaller than those obtained by static adsorption method due to specific features of adsorption kinetics. Henry's constants, K Γ distribution factors, f, and adsorption solution activity coefficient, γ a,i , for anisole and benzaldehyde adsorbed on hydroxylated and POE modified silica have been calculated. The values of K Γ and f obtained by both the static adsorption and HPLC methods have been compared. The enthalpies and entropies of adsorption of aromatic compounds have been compared with the polarity parameters

Application of the DR and DS Equations to Benzene Adsorption from Water Solutions

Equations of the theory of micropore filling have been applied to the description of adsorption equilibria in systems containing microporous carbon and benzene solutions in water. The parameters of these equations have been evaluated from experimental data obtained for two commercial activated carbons. Comparison of the calculated and experimental adsorption isotherms suggest that these activated carbons are characterized by heterogeneous microporosity. The effect of water on the adsorption behaviour of benzene molecules in the micropores has been considered

Adsorption Equilibria in Carbon/Hydrocarbon/Water Systems

Two equations derived from the theory of volume filling of micropores (the DR and DS equations) were used for the description of the liquid-phase adsorption of benzene, toluene and p -xylene from aqueous solution on to two commercial microporous activated carbons. Comparison of the experimental and calculated adsorption isotherms showed good accord between the theoretical and experimental values. The results of this work indicate that the parameters of these equations can be used for modelling a water purification process based on the activated carbons