Kinetic features of the adsorption of sodium oleate on talc

Kinetic features of the adsorption of sodium oleate on dispersed talc samples of Onotskoe deposit are studied. It is shown that adsorption proceeds in two steps with different rate constants of adsorption k _a and desorption k _d. It is found that at the first step, lasting for nearly one hour under experimental conditions, the process is characterized by high k _a and k _d values (1.23 × 10^?2 m²/(mol min) and 1.06 × 10^?5 m²/(L min), respectively). It is concluded that the final stage associated with the rearrangement of molecules on a talc surface lasts for a long time with k _a = 2.12 × 10^?3 m²/(mol min) and k _d = 1.82 × 10^?6 m²/(L min).