Preparation and Performance Study of Fe2O3/Geopolymer Porous Ceramics

Abstract

In this paper, a kind of geopolymer porous ceramic was prepared using the physical foaming method combined with the gel casting process. The effect of sintering temperature on phase composition and physical properties of samples was studied. Fe2O3/geopolymer porous ceramic samples were prepared by Fe2O3 loaded on the surface of geopolymer porous ceramic samples through the impregnation-calcination method. The Fe2O3-loaded geopolymer porous ceramic samples were characterized by SEM-EDS, FTIR, and XPS. The adsorption experiments were employed to investigate the effect of testing conditions on the adsorption of Pb(Ⅱ) from the Pb(NO3)2 solution. The results show that the porosity of geopolymer porous ceramic samples decreased while the compressive strength increased, and the proportion of pores with a pore size range of < 0.1 mm and 0.1 mm – 0.2 mm increased. The adsorption capacity and removal rate of Pb(II) first increased and then decreased with the increase of Fe(NO3)3 solution concentration, calcination temperature, and holding time. The adsorption capacity and removal rate of Pb(Ⅱ) increased with the increase of the pH value and the initial Pb(II) concentration of the solution.