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  • Basic dye removal from aqueous solutions by dodecylsulfate- and dodecyl benzene sulfonate-intercalated hydrotalcite.

Basic dye removal from aqueous solutions by dodecylsulfate- and dodecyl benzene sulfonate-intercalated hydrotalcite.

Journal of hazardous materials (2007-11-13)
Mohamed Bouraada, Mama Lafjah, Mohand Said Ouali, Louis Charles de Menorval
ABSTRACT

Dodecylsulfate- and dodecyl benzene sulfonate-hydrotalcites were prepared by calcination-rehydratation method. The surfactants intercalation in the interlayer space of hydrotalcite were checked by PXRD and FTIR spectroscopy where the resulting materials were found to be similar to those reported in the literature and were used to remove a basic dye (safranine) from aqueous solutions. The sorption kinetics data fitted the pseudo second order model. The isotherms were established and the parameters calculated. The sorption data fitted the Langmuir model with good values of the determination coefficient. The thermodynamic parameters calculated from Van't Hoff plots gave a low value of Delta G degrees (<-20 kJ mol(-1)) indicating a spontaneous physisorption process. Two regeneration cycles were processed by acetone extraction leading to the same removal capacity of the obtained materials as the original surfactant-intercalated hydrotalcites. The UV-vis spectra of the recovered extracts were similar to the spectrum of safranine, which means that the dye was recovered without any modification.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Ammonium lauryl sulfate solution, ~30% in H2O
Sigma-Aldrich
Lithium dodecyl sulfate, ≥98.5% (GC)
Sigma-Aldrich
Lithium dodecyl sulfate, BioReagent, for molecular biology, suitable for electrophoresis
Sigma-Aldrich
Lithium dodecyl sulfate, BioXtra, ≥98.5% (GC)
Sigma-Aldrich
Ammonium lauryl sulfate solution, ~30% in H2O (T)