Kinetic features of the adsorption of sodium oleate on talc

Abstract

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 ka and desorption kd. It is found that at the first step, lasting for nearly one hour under experimental conditions, the process is characterized by high ka and kd 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 ka = 2.12 × 10−3 m2/(mol min) and kd = 1.82 × 10−6 m2/(L min).