Inscriere cercetatori

Site nou !

Daca nu va puteti recupera parola (sau aveti alte probleme), scrieti-ne la pagina de contact. Situl vechi se gaseste la adresa old.ad-astra.ro

Facebook

Thermodynamic study of phenol sorption from aqueous solutions on styrene-divinylbenzene copolymers

Domenii publicaţii > Chimie + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: V. Neagu, I. Untea, E. Tudorache et C. Orbeci

Editorial: Revue Roumaine de Chimie, 52 (4), p.433-437, 2007.

Rezumat:

In this study, comparative experimental data regarding the equilibrium of phenol retention in water solutions through adsorption on synthesized (S-DVB) and commercial (Amberlite XAD-1) macroporous styrene – divinylbenzene copolymers, with different morphological structures are presented. The phenol adsorption capacity of water solution, expressed under the form of isotherms of adsorption is found to be in a positive correlation with the structural and morphological properties of macroporous copolymers, especially with their specified surface. The values of the adsorption capacity are highly influenced by concentration, the experimental isotherms of adsorption being related to the Freundlich – type isotherm. The previous swelling of macroporous styrene-divinylbenzene copolymers in contact with methyl alcohol leads to a great increase (of 50-100%) in the retention capacity of phenol. Compared to active carbon, the adsorption capacity (expressed as mg phenol/g) of macroporous styrene – divinylbenzene copolymers is largely diminished due to the great difference in the specific surface (much bigger in the case of activated carbon) but the specific charge of the surface (expressed as mg phenol/m2) is comparable, even bigger in the case of macroporous copolymers, in the domain with higher phenol concentration in water.

Cuvinte cheie: macroporous styrene-divinylbenzene copolymers, phenol, sorption capacity