Organo-layered double hydroxides for the removal of polycyclic aromatic hydrocarbons from soil washing effluents containing high concentrations of surfactants

Adsorption of polycyclic aromatic hydrocarbons over CuZnFeAl–LDH modified by sodium dodecyl sulfate

“…33 The results show that SDS was successfully introduced into CuZnFeAlO, which indicates that SDS successfully entered the LDH interlayer. 34 At the same time, these changes prove the geometric perturbation of functional groups (-SO 3 ). The existence of the S]O bond indicates that there is a hydrogen bond between LDH and the sulfate groups, which is electrostatically bound to the metal on the surface of LDH, i.e., S]O/H-O-M (M ¼ Cu, Zn, Fe or Al).…”

Selective sorption of PAHs from TX100 solution by resin SP850: effects of TX100 concentrations and PAHs solubility

“…Freundlich model fitted 1/ n is a parameter to describe the non-linearity of isotherms. 20,36 For SP850, 1/ n values of 6 PAHs by SP850 at given TX100 initial concentrations were relatively constant, with a mean value of 0.775 ± 0.012 (Fig. S3 † ), which was smaller than that of organo-layered double hydroxide (organo-LDH with 1/ n ≈ 1.0) 20 and organo-bentonite with 1/ n ≈ 1.0.…”

“… 20,36 For SP850, 1/ n values of 6 PAHs by SP850 at given TX100 initial concentrations were relatively constant, with a mean value of 0.775 ± 0.012 (Fig. S3 † ), which was smaller than that of organo-layered double hydroxide (organo-LDH with 1/ n ≈ 1.0) 20 and organo-bentonite with 1/ n ≈ 1.0. 10 This indicating that the sorption of PAHs by SP850 in the presence of surfactant is a surface adsorption process, while that by the organo-LDH and organo-bentonite is a partition-dominated process.…”

“…Freundlich model ( eqn (1) ), a commonly empirical formula used to fit the isotherms of organic compounds by adsorbents in the presence of surfactant, 20,36,37 was employed in this study to fit the isotherms of PAHs from TX100 solution by SP850. q e = K f C e 1/ n where q e (mg g −1 ) is the equilibrium adsorbed concentration; C e (mg L −1 ) is the equilibrium aqueous concentration; K f [(mg g −1 )/(mg L −1 ) 1/ n ] is Freundlich affinity coefficient; 1/ n is the Freundlich exponential coefficient.…”

Remediation of soils contaminated by hydrophobic organic compounds: How to recover extracting agents from soil washing solutions?

“…Recently, the use of organo-bentonite and organo-layered double hydroxide has also been investigated [68,69]. The objective of such material is to provide a strong affinity between target pollutants and the organic phase within bentonite or layered double hydroxide.…”