title: Removal of lead(II) from aqueous solution using modified palygorskite, contribution of inverse gas chromatography.
abstract: Four modified palygorskite powders that had been milled in mortar, in air jet mill, in Pulverisette0 vibrating ball mill and treated with hydrochloric acid were used as adsorbents for lead removal from an aqueous solution. The adsorbents were characterized by nitrogen adsorption, size measurement, mercury porosimetry and scanning electron microscopy. Inverse gas chromatography at infinite dilution and finite concentration was also implemented to determine surface properties of the four samples, in particular the irreversibility indexes, a measurement of high-energy sites. In a second part, batch adsorption experiments were carried out to study the effect of mechanical and chemical treatments on lead adsorption properties of the powder. The isotherm analysis indicated that the Langmuir model could represent the adsorption data. The sample ground in Pulverisette0 presented the highest cationic exchange capacity and led to the highest adsorption capacity despite the relatively low specific surface area and the complete destruction of the fibrous morphology of the raw powder. A correlation was shown between the cationic exchange capacity and irreversibility indexes obtained with isopropanol.
authors.affiliation: C.R.A.P.C., BP 248, Alger Rp, 16004 Alger, Algeria; L.P.C.M.A.E., Faculté de Chimie, USTHB, BP 32 El Alia, Bab Ezzouar, 16111 Alger, Algeria. Electronic address: boud_lil@yahoo.fr.
authors.forename: L
authors.initials: L
authors.lastname: Boudriche
authors.affiliation: Université de Toulouse, Mines Albi, CNRS, Centre RAPSODEE, Campus Jarlard, F-81013 Albi Cedex 09, France.
authors.forename: R
authors.initials: R
authors.lastname: Calvet
authors.affiliation: Université de Toulouse, Mines Albi, CNRS, Centre RAPSODEE, Campus Jarlard, F-81013 Albi Cedex 09, France.
authors.forename: A
authors.initials: A
authors.lastname: Chamayou
authors.affiliation: L.P.C.M.A.E., Faculté de Chimie, USTHB, BP 32 El Alia, Bab Ezzouar, 16111 Alger, Algeria.
authors.forename: B
authors.initials: B
authors.lastname: Hamdi
authors.affiliation: Lab. Chimie Physique, (ENSCMu) ENSISA-W, 11, rue Werner, 68093 Mulhouse Cedex France.
authors.forename: H
authors.initials: H
authors.lastname: Balard
mesh_terms: D000327:Adsorption; D002413:Cations, Divalent; D002849:Chromatography, Gas / Q000379:methods; D004785:Environmental Pollutants / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000302:isolation & purification*; D017616:Magnesium Compounds / Q000737:chemistry*; D011208:Powders; D017655:Silicon Compounds / Q000737:chemistry*; D012996:Solutions; D013499:Surface Properties; D014867:Water
chemical_list: D002413:Cations, Divalent; D004785:Environmental Pollutants; D017616:Magnesium Compounds; D011208:Powders; D017655:Silicon Compounds; D012996:Solutions; D014867:Water; D007854:Lead; C026325:attapulgite
keywords: Adsorption; Attapulgite; Heavy metal; Inverse gas chromatography; Isotherm; Palygorskite