Abstract
In the present work Ukrainian clinoptilolite was modified with Ag and applied for the removal of iodide from aqueous solutions. The effect of three different modifications was studied, one resulting in an Ag+ ion exchanged form, and two resulting in zeolites decorated with silver oxide and zero valent metallic nanoparticles. The results indicated the strong potential affinity of the Ag-modified zeolite materials towards iodide.
Highlights
Iodine is an essential element that’s necessary for a normal thyroid function
Based on the nitrogen adsorption-desorption study it can be stated that the clinoptilolite skeleton does not change with modification procedure, but average pore size changes as result of cation exchange and sodium borohydride treatment
Mineralogical composition of each sample was determined by X-ray diffraction (XRD) analysis (Figure 1)
Summary
Iodine is an essential element that’s necessary for a normal thyroid function. high concentration of iodine in food and water calls a great concern of production of the congenital goiter. Asian diet contain iodine-rich food [5], whereas in Europe drinking water with high level of iodine have been reported [6]. Iodine/iodide excess is a recognisable environmental risk factor for development of thyroid disorders and population of elderly, pregnant, foetuses and neonates are more susceptible to excess iodine induced diseases. Another concern with iodide/iodine is related to radioactive isotopes released from nuclear power plans. Trasnscarpathian zeolites have been successfully applied in the environmental protection chemistry and industry [12] Their non-toxic and non-swelling properties, thermal stability and potential of regeneration as well as high rate of ion exchange makes them excellent candidates in sorption processes. I− anions are readily react with silver oxide (Ag2O) to form the water-insoluble
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