The effect of interlayer anion on the reactivity of Mg–Al layered double hydroxides: Improving and extending the customization capacity of anionic clays

RICARDO ROJAS; FELIPE BRUNA; CARLOS PRIMO DE PAULI; M. ÁNGELES ULIBARRI; CARLA E. GIACOMELLI

JOURNAL OF COLLOID AND INTERFACE SCIENCE

ACADEMIC PRESS INC ELSEVIER SCIENCE

Lugar: Amsterdam; Año: 2011 vol. 359 p. 136 - 141

0021-9797

Layered double hydroxides (LDHs) reactivity and interfacial behavior are closely interconnected and control particle properties relevant to the wide range of these solids’ applications. Despite their importance, their relationship has been hardly described. In this work, chloride and dodecylsulfate (DDS-) intercalated LDHs are studied combining experimental data (electrophoretic mobility and contact angle measurements, hydroxyl and organic compounds uptake) and a simple mathematical model that includes anion-binding and acid-base reactions. This approach evidences the anion effect on LDHs interfacial behavior, reflected in the opposite particle charge and the different surface hydrophobic/hydrophilic character. LDHs reactivity is also determined by the interlayer composition, as demonstrated by the cation uptake capability of the DDS- intercalated sample. Consequently, the interlayer anion modifies the LDHs interfacial properties and reactivity, which in turn extends the customization capacity of these solids.