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STUDY OF SOME PHYSICOCHEMICAL （一些物理化学的研究）.pdf

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STUDY OF SOME PHYSICOCHEMICAL （一些物理化学的研究）

Clays and Clay Minerals, VoL 38, No. 4, 356-362, 1990. STUDY OF SOME PHYSICOCHEMICAL PROPERTIES OF PILLARED MONTMORILLONITES: ACID-BASE POTENTIOMETRIC TITRATIONS A N D ELECTROPHORETIC MEASUREMENTS MARCELO J. AVENA, RAOL CABROL, AND CARLOSP. DE PAULI InstitutO de Investigaciones en Fisicoquimica de C6rdoba (INFIQC) Dpto. de Fisico Quimica, Facultad de Ciencias Quimicas Universidad Nacional de C6rdoba. Suc. 16, C. C. 61, 5016 C6rdoba, Argentina Abstract- The surface charges and the zeta potential ofa Na-montmorillonite(Na-mont) and two pillared montmorillonite (MP1 and MP2) samples with different aluminum contents were determined by poten- tiometric titrations and electrophoretic measurements. At pH 9 the two pillared montmorillonitesam- ples showed zeta potentials similarto those of Na-mont, but at pH 8, the negative zeta potential shifted to lower negative values as the aluminumcontent increased. Sample MP 1,which had a greater A1content, showed an isoelectric point (IEP) of 5.0-5.5. Titration curves obtained by acid-base potentiometric titration for sample MP1 showed a well-defined cross-over point at pH = 5.0, whereas this point was not observed for sample MP2 in the pH range studied. The results indicate, in principle, that both techniques can be used to characterize surface charges in this type of material. An attempt was also made to relate the data obtained from electrophoretic mobility and potentiometric titrations. Key Words--Electrophoretic mobility, Montmorillonite, Pillared clays, Potentiometr