Résumé
The molecular mechanism of Methyl Orange (MO) dye adsorption on the external surface of Mg2Al–CO3 layered double hydroxide (LDH) was investigated by combining adsorption isotherms, X-ray diffraction, and infrared (IR) and Raman spectroscopies coupled to DFT calculations. The vibrational dynamic behavior upon adsorption and the molecular surface organization were correlated with the adsorption isotherm revealing a four-domain uptake mechanism. The peculiar high adsorption capacity of LDH toward MO was explained by the surface-promoted dye aggregation over the external surface of particles.