Electrolyte ion effects on Cd2+ binding at Al2O3 surface: specific synergism versus bulk effects.

Cd(2+) binding on gamma-Al(2)O(3) was studied in the presence of the common electrolyte ions Mg(2+), SO(4)(2-), and NO(3)(-) at high and low concentrations. Direct measurements were performed for Cd(2+) as well as for electrolyte ion adsorption as a function of pH. The experimental data reveal that Cd(2+) binding on gamma-Al(2)O(3) is modulated by the electrolyte ions in a complex manner.

Physicochemical study of amino-functionalized organosilicon cubes intercalated in montmorillonite clay: H-binding and metal uptake.

Two organic-modified montmorillonite clays were prepared by embedding organosilanes bearing different chelating amino-functional groups [Apteos] (3-amino-propyltriethoxysilane), and [Edaptmos] (3-(2-aminoethylamino)propyltrimethoxysilane), in the interlayer space of a Zenith montmorillonite. XRD and FTIR spectroscopic data show that the amino organosilanes are intercalated into the interlamelar space forming cube-like structures bearing one polymanino tail at each cube apex. The intercalated cubes cause an increase of the interlayer spacing of the clay sheets by 6.