title: Fluorinated hydrotalcites: the addition of highly electronegative species in layered double hydroxides to tune basicity.
abstract: Hydrotalcite-like compounds were synthesized by coprecipitation using a constant-pH method. Aluminum was introduced in the form of an octahedral aluminum fluorine complex during the synthesis. Controlling the pH during the synthesis ensured that aluminum fluorine did not decompose to tetrahedral species but remained in the octahedral (AlF(6))(3-) form to be incorporated into brucite-like sheets. The physicochemical, thermal, and spectroscopic characterizations showed significant modifications by fluorine introduction regarding structural, textural, and adsorption properties. The memory effect of fluorinated hydrotalcites differed from the memory effect commonly observed in fluorine-free hydrotalcites. Nitromethane adsorption showed that the basicity of hydrotalcite was greatly modified by the fluorine loading.
authors: Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito exterior s/n, Cd. Universitaria, Del. Coyoacán, CP 04510, México D. F., Mexico. lima@iim.unam.mx
authors: Enrique
authors: E
authors: Lima
authors: María de Jesús
authors: Mde J
authors: Martínez-Ortiz
authors: Renata Isabel
authors: RI
authors: Gutiérrez Reyes
authors: Marco
authors: M
authors: Vera