title: Dynamic sorption of ionizable organic compounds (IOCs) and xylene from water using geomaterial-modified montmorillonite.
abstract: Adsorption of phenols and xylene onto composite material, Na-montmorillonite, activated carbon, cement and water mixture, 70%, 7%, 7% and 16% (w/w/w/w), respectively, was studied at pH values of 5.15, 4.55, 5.2 and 4.9, respectively, of phenol, 2-CP, 2-NP and xylene. Equilibrium isotherms and fixed-bed column studies were undertaken to evaluate the performance of clay-active coal-coated cement (CACC) in removing phenols from aqueous solution. Investigations revealed CACC to be a very efficient media for the removal of phenols from water. The suitability of the Langmuir adsorption model to the equilibrium data was investigated for all phenols-adsorbent systems. At the maximum sorption capacity of the composite material it was found that the uptake (mg phenols/g) of phenols increased in the order 2-CP>2-NP>phenol approximately m-xylene as do their solubilities. The LUB design approach was used to determine the equivalent length of unused bed. The lower LUB values imply a better utilization of CACC composite. A model, which considered the effect of axial dispersion, was successfully used to describe the fixed-bed operation, the axial dispersion coefficient increased significantly with solubility.
authors.affiliation: Departement of Chemical Engineering, University of Blida, P.O. Box 270-09000 Blida, Algeria.
authors.forename: M
authors.initials: M
authors.lastname: Houari
authors.forename: B
authors.initials: B
authors.lastname: Hamdi
authors.forename: J
authors.initials: J
authors.lastname: Brendle
authors.forename: O
authors.initials: O
authors.lastname: Bouras
authors.forename: J C
authors.initials: JC
authors.lastname: Bollinger
authors.forename: M
authors.initials: M
authors.lastname: Baudu
mesh_terms: D000042:Absorption; D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry; D001546:Bentonite / Q000737:chemistry*; D000077215:Clay; D007700:Kinetics; D010636:Phenols / Q000737:chemistry / Q000302:isolation & purification*; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*; D014992:Xylenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D000538:Aluminum Silicates; D010636:Phenols; D014874:Water Pollutants, Chemical; D014992:Xylenes; D014867:Water; D001546:Bentonite; D000077215:Clay