Ion exchange properties, selectivities and standard Gibbs free energies of Ag⁺, K⁺, NH₄⁺ and Li⁺ has been studied with the synthetic zeolite P made from the domestic sodium feldspar calcinated at 800 ℃ and treated with 2N sodium hydroxide solution at 100 ℃ for 3∼ 12 hrs. The crystalline structure of this synthetic zeolite P was estimated by X-ray diffraction method.
The results were as follows. The crystalline structure was the body centered cubic and the length of the unit cell was corresponded with the other reference.
Univalent ion exchange properties of the zeolite P prepared with feldspar for 10 hrs. were excellent. And than the selectivity series at S_M<0.6 has been reflected in the order Ag⁺>Na⁺>K⁺>NH₄⁺>Li⁺. And/or the order of decreasing standard Gibbs free energy has been found Li⁺>NH₄⁺>K⁺>Ag⁺.