TY - JOUR
T1 - Synthesis of linear alkylbenzene sulphonate intercalated iron(II) iron(III) hydroxide sulphate (green rust) and adsorption of carbon tetrachloride
AU - Ayala Luis, Karina Barbara
AU - Kaldor, D.K.
AU - Bender Koch, Christian
AU - Strobel, Bjarne Westergaard
AU - Hansen, Hans Christian Bruun
PY - 2007
Y1 - 2007
N2 - 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
AB - 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
KW - Former LIFE faculty
KW - green rust
KW - phyllosilicates
KW - layered double hydroxides
KW - reactivity
KW - carbonates
KW - synthesis
KW - organic contaminants
U2 - 10.1180/claymin.2007.042.3.04
DO - 10.1180/claymin.2007.042.3.04
M3 - Journal article
SN - 0009-8558
VL - 42
SP - 307
EP - 317
JO - Clay Minerals
JF - Clay Minerals
IS - 3
ER -