Bouna, Lahcen and Rhouta, Benaïssa and Amjoud, M'barek and Jada, Amane and Maury, Francis and Daoudi, Lahcen and Senocq, François Correlation between eletrokinetic mobility and ionic dyes adsorption of Moroccan stevensite. (2010) Applied Clay Science, vol. 48 (n° 3). pp. 527-530. ISSN 0169-1317
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Official URL: http://dx.doi.org/10.1016/j.clay.2010.02.004
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.
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