The adsorption of tri-n-butylphosphate at the n-dodecane–water interface

Abstract

. Can. J. Chem. 57, 1218 (1979).The adsorption of tri-n-butylphosphate (TBP) from n-dodecane to the n-dodecane-water interface has been studied as a function of TBP mole fraction up to 2.7 x in the n-dodecane, and as a function of temperature from 293.15 K to 308.15 K. Free energies of adsorption were calculated from the results at low TBP mole fractions, where the surface pressures were linear with mole fraction. They were in the range -36.1 to -35.6 kJ/rnol. The enthalpy of adsorption, determined from the variation of the free energies of adsorption with temperature, was -45.4 kJ/mol.Several equations of state based on two-dimensional gas laws were applied to the results. [Traduit par le journal]

Molecular Dynamics Study of the Behaviour of TBP-Zinc-Chloride Complex at the Chloroform/Water Interfacial System

“…TPB as amphiphilic compound adsorbs at the interface. A similar observation was described in article (35).…”

THEORETICAL STUDIES ON TRI-n-BUTYL PHOSPHATE: MD SIMULATIONSIN VACUO, IN WATER, IN CHLOROFORM, AND AT A WATER / CHLOROFORM INTERFACE.

“…character, TBP adsorbs at the interface between the aqueous and the organic phases, as shown by surface tension measurements at water/dodecane (51) or water/benzene interfaces (52). There is however no microscopic pictures of the interface.…”

The adsorption of tri-N-butylphosphate at the benzene–water interface

“…[5], where n is the surface pressure as before, and i and A , are fitting constants. The area available per molecule, A , was calculated from the Gibbs adsorption isotherm using the constants of Table 1, as previously described (1,2). Activity coefficients of TBP in benzene were taken as 1 .O.…”

“…This behavior corresponds to increased cohesion in the adsorbed layer, somewhat similar to that for ionized adsorbed layers (17). Some of this repulsion can be accounted for by dipole-dipole repulsion in the adsorbed layer (1,2), or by variation of A , with coverage. Attempts were made to use a two-dimensional solution model for the interface (18, 19) and to fit data to the Van der Wads equation of state (20), but , these did not result in any improvements in the fit.…”