The investigation of phenol removal from aqueous solutions by zeolites as solid adsorbents.
This work reports results on phenol adsorption from aqueous solutions on synthetic BEA (β) and MFI (ZSM-5) zeolites, studied by heat-flow microcalorimetry. For the sake of comparison, the adsorption was performed on activated carbon, a solid customarily used for removal of phenol from water. The obtained values of heats evolved during phenol adsorption indicate the heterogeneity of active sites present on the investigated systems for the adsorption of phenol. In addition, the amounts of adsorbed pollutant were determined and presented in the form of adsorption isotherms, which were interpreted using Langmuir, Freundlich, Dubinin-Astakov and Sips' equations. The latter was found to express high level of agreement with experimental data. The results obtained in this work reveal that the adsorption of phenol on zeolites depends on both Si/Al ratio and on the pore size. Hydrophobic zeolites that possess higher contents of Si show higher affinities for phenol adsorption. Among investigated zeolites, zeolite β possesses the highest capacity for adsorption of phenol. The possibility of regeneration of used adsorbents was investigated by thermal desorption technique. It has been shown that in the case of β zeolite the majority of adsorbed phenol is easily released in the low temperature region.
Damjanović
Ljiljana
L
Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11158 Belgrade 118, P.O. Box 47, Serbia.
Rakić
Vesna
V
Faculty of Agriculture, Department of Chemistry, University of Belgrade, Nemanjina 6, 11080 Zemun, Serbia. Electronic address: vesna.rakic@ffh.bg.ac.rs.
Rac
Vladislav
V
Faculty of Agriculture, Department of Chemistry, University of Belgrade, Nemanjina 6, 11080 Zemun, Serbia.
Stošić
Dušan
D
Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11158 Belgrade 118, P.O. Box 47, Serbia; Institut de Recherches sur la Catalyse et l'Environnement de Lyon (IRCELYON), UMR 5256 CNRS/Université Lyon1, 2 av. Albert Einstein, 69626 Villeurbanne Cedex, France.
Auroux
Aline
A
Institut de Recherches sur la Catalyse et l'Environnement de Lyon (IRCELYON), UMR 5256 CNRS/Université Lyon1, 2 av. Albert Einstein, 69626 Villeurbanne Cedex, France.
D000327:Adsorption; D002151:Calorimetry; D019800:Phenol / Q000302:isolation & purification*; D012996:Solutions; D014867:Water / Q000737:chemistry*; D017641:Zeolites / Q000737:chemistry*
D012996:Solutions; D014867:Water; D017641:Zeolites; D019800:Phenol