Investigation of water adsorption properties of Sivrihisar sepiolite

In this study, water adsorption properties of natural sepiolite from Eskişehir Sivrihisar (Kaymaz) region and its samples in different ion forms were examined.Modified forms of sepiolite samples were prepared in 1M NaCl, KCl, CaCl2 and MgCl2, solutions. Na+ (Na-KS), K+ (K-KS), Ca+2 (Ca-KS) and Mg+2 (Mg-KS) forms of samples were obtained after ion change process. For each of these forms, amounts of water adsorbed versus of relative pressure (P/P0) was determined. It was determined that a strong relationship between amount of adsorbed water vapour by specimens and hydration energies of exchangeable cations. Clays exchanged with monovalent cations sorbed less water than clays exchanged with divalent cations. The amount of adsorbed water was influenced by the exchangeable cation with the order of increase being: Natural sepioliteKeyword: Adsorbentler = Adsorbents ; Adsorplama özellikleri = Adsorbtive properties ; Adsorpsiyon = Adsorption ; Adsorpsiyon katalizörler = Adsorption catalysts ; Adsorpsiyon kinetiği = Adsorption kinetic ; Sepiyolit = Sepiolite ; Su aktivitesi = Water activity ; Su tutma = Water holding