Anion adsorption capacity from the iron hydroxyl group of Fe-modified Na-P1 type zeolite

Abstract

A Fe-modified Na-P1 type artificial zeolite (Fe-P1) was prepared by mixing with the synthesized zeolite powder using chemical reagents and FeCl₃ solution. The anion exchange capacity was generated by the iron hydroxyl group on the zeolite surface. Although the intensity of the X-ray diffraction (XRD) peaks for the zeolite phase decreased with an increase in the concentration of the mixed FeCl₃ solution, the anion exchange ability for the phosphate was improved due to the increase in the surface area. The Fe-P1 zeolite showed a high selectivity for the anions of phosphoric acid and arsenic acid. The anion adsorption capacity was significantly increased under the acidic condition (pH 5) of the solution. Acidic treatment of the Fe-P1 zeolite was also effective for the anion adsorption.