Abstract

Titanium potassium vanadate (TiKV) as an inorganic ion exchange material was synthesized from titanium tetrachloride, potassium chloride and sodium monovanadate with molar ratio Ti: K: V = 1: 1: 1. The kinetic behaviour of Cs⁺, Co²⁺and Cd²⁺ have been studied under different conditions of concentration, particle size, reaction temperatures and drying temperatures. The experimental conditions were set to favour particle diffusion control. The values of diffusion coefficient (D_i), activation energy (E_a), entropy of activation (ΔS^*), enthalpy change (ΔH^*) and free energy change (ΔG^*) were calculated and their significance was discussed. The data obtained have been compared with those reported for other inorganic ion exchangers.

Key words: Diffusion, ion exchange, titanium potassium vanadate, thermodynamic parameters.