Abstract
Polystyrene based strontium phosphate membranes (SPM) prepared by applying different pressures. The membrane potential was measured with uni-univalent electrolytes (KCl, NaCl, and LiCl) solutions using saturated calomel electrode (SCEs). The effective fixed charge density of these membranes was determined by TMS method and it showed dependence of membrane potential on the porosity, charge on the membrane matrix, charge and size of permeating ions. The membranes were characterized by X-ray diffraction, scanning electron microscopy, and IR spectroscopy. The order of surface charge density for electrolytes is found to be KCl > NaCl > LiCl. Other important parameters such as transport number, distribution coefficient, charge effectiveness and related parameters were calculated. The membrane was found to be mechanically stable, and can be operated over a wide pH range. Moreover, the experimental results were found to be quite satisfactorily with theoretical values.
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