Synthesis of linear alkylbenzene sulphonate intercalated iron(II) iron(III) hydroxide sulphate (green rust) and adsorption of carbon tetrachloride

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Green rusts, GRs, can act as both sorbents and reductants towards selected pollutants. Organo-GRs are expected to combine these properties with a high affinity for hydrophobic substances. A novel organo-GR, GRLAS, was synthesized by incorporating a mixture of linear alkylbenzenesulphonates (LAS) into the interlayer space of synthetic sulphate green rust, GR . Mössbauer analysis of GRLAS indicates that the structure of the organo-GR is very similar to SO4 that of the initial GR with regard to the FeII/FeIII ratio and local coordination of Fe atoms. X-ray SO4 diffraction demonstrates that the GRLAS formed was well ordered, although a mixture of surfactant was used for intercalation. The basal spacings of the GRLAS and the kinetics of the ion-exchange process were dependent on the initial surfactant loading; basal spacings of ~2.85 nm were obtained at The ratio LAS solution concentrations >10 mM. LASadsorbed/SO42- desorbed significantly exceeded the stoichiometric ratio of 2 during the initial part of the ion-exchange process (t = 5 h). However, this ratio was reached progressively with time. GR preferentially sorbed LAS homologues with long SO4 alkyl chains over short ones. Carbon tetrachloride was successfully adsorbed into GRLAS. The adsorption isotherm was linear with a distribution coefficient, Kd, of 505 ± 19 litre kg-1
Original languageEnglish
JournalClay Minerals
Volume42
Issue number3
Pages (from-to)307-317
Number of pages11
ISSN0009-8558
DOIs
Publication statusPublished - 2007

    Research areas

  • LIFE - green rust, phyllosilicates, layered double hydroxides, reactivity, carbonates, synthesis, organic contaminants

ID: 8081767