The effect of carrier salts blending on the morphology, stability and permeation properties of PES/PEO facilitated transport membranes

► Mixtures of salts were used in preparation of facilitated transport membranes. ► Effect of salt blending on the reduction of silver carrier sites was analyzed. ► Presence of divalent and monovalent cations leads to higher selectivity. ► Size and quantity of silver particles in the membranes with mixed salts were low. ► Incorporation of copper salt enhances surface roughness and mechanical strength.