Correlation between eletrokinetic mobility and ionic dyes adsorption of Moroccan stevensite

Lahcen Bouna (1, 2, 3) , Benaïssa Rhouta (1) , M'Barek Amjoud (1) , Amane Jada (3) , Francis Maury (2) , Lahcen Daoudi (4) , François Senocq (2)

1 LMCN - Laboratoire de Matière Condensée et Nanostructures
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
3 IS2M - Institut de Science des Matériaux de Mulhouse
4 LGG - Laboratoire de Géosciences et Géoenvironnement

This study aims at establishing a correlation between the electrical charge of Moroccan stevensite particles and ionic dyes adsorption. The electrophoretic mobility, (Ue), of the stevensite particles in water, was measured at pH 2.5–12 by microelectrophoresis. At pH between 2.5 and 8, Ue remained constant (Ue = − 1.6 10− 8 m2/(V s)), as resulting from the permanent charge of the clay mineral planar surfaces. At pH > 8, the magnitude of electrophoretic mobility increased (Ue = − 2.7 10− 8 m2/(V s)) due to the deprotonation of silanol groups on the surfaces. The anionic Orange G adsorption at the clay mineral–water interface was negligible whereas the methylene blue cations were strongly adsorbed due to the electrostatic attraction.

Mots clés: Stevensite; Dyes; Electrophoretic mobility; Adsorption

Domaines: Matériaux; Matériaux

Lahcen Bouna, Benaïssa Rhouta, M'Barek Amjoud, Amane Jada, Francis Maury, et al.. Correlation between eletrokinetic mobility and ionic dyes adsorption of Moroccan stevensite. Applied Clay Science, 2010, 48 (3), pp.527-530. ⟨10.1016/j.clay.2010.02.004⟩. ⟨hal-03551013⟩