Influence of carbonate intercalation in the surface-charging behavior of Zn-Cr layered double hydroxides

RICARDO ROJAS; CRISTOBALINA BARRIGA; CARLOS PRIMO DE PAULI; MARCELO J. AVENA

Elsevier

Lugar: Amsterdam; Año: 2010 vol. 119 p. 303 - 303

p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">The influence of interlayer composition in the surface charge and reactivity of layered double hydroxides (LDHs) has been explored. With this purpose, a chloride intercalated Zn-Cr LDH has been synthesized by the constant pH coprecipitation method and afterwards exchanged with carbonate to obtain solids with different Cl-/CO32- ratios. The solids structure has been characterized by elemental chemical analysis, powder X-ray diffraction and infrared spectroscopy, while its surface charging behavior and reactivity has been studied by acid-base potentiometric titrations and electrophoretic mobility determinations. The chloride intercalated sample shows an increasing hydroxyl adsorption with increasing pH and decreasing support electrolyte concentration and the particles present positive electrophoretic mobility in the measured pH range. As carbonate content increases in the samples, the total