• journal_title：Clay Minerals
• Contributor：K. B. AYALA-LUIS ; D. K. KALDOR ; C. BENDER KOCH ; B. W. STROBEL ; H. C. B. HANSEN
• Publisher：Mineralogical Society of Great Britain and Ireland
• Date：2007-
• Format：text/html
• Language：en
• Identifier：10.1180/claymin.2007.042.3.04
• journal_abbrev：Clay Minerals
• issn：0009-8558
• volume：42
• issue：3
• firstpage：307
• section：Articles

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, GR_LAS, was synthesized by incorporating a mixture of linear alkylbenzenesulphonates (LAS) into the interlayer space of synthetic sulphate green rust, GR . Mössbauer analysis of GR_LAS indicates that the structure of the organo-GR is very similar to SO₄ that of the initial GR with regard to the Fe^II/Fe^III ratio and local coordination of Fe atoms. X-ray SO₄ diffraction demonstrates that the GR_LAS formed was well ordered, although a mixture of surfactant was used for intercalation. The basal spacings of the GR_LAS 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. LAS_adsorbed/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 GR_LAS. The adsorption isotherm was linear with a distribution coefficient, K_d, of 505 ± 19 litre kg⁻¹