ADSORPTION OF PERCHLORATE BY GFH AND GAC IN WATER

This study aims to remove perchlorate when using granular ferric hydroxide (GFH) and granular activated carbon (GAC) in water. Dynamic and equilibrium adsorption experiments were performed to evaluate the thermodynamic behaviour of perchlorate on GFH and GAC. The experimental results showed that two dynamic adsorption experiments achieved equilibrium in approximately forty minutes and eight hours. The maximal adsorption capacities of GAC and GFH were 33.8 - 28.2 mg/g and 2.7 - 3.5 mg/g, respectively, at a constant temperature between 5 ℃ and 45 ℃. The thermodynamic parameters, such as the equilibrium constant (K0), the standard free energy changes (ΔG°), the standard enthalpy change (ΔH°) and the standard entropy change(ΔS°), were obtained.