Isomorphous Substitution of Iron and Nickel into Analcime Zeolite

Abstract

Studies on the effects of iron and nickel incorporation into the hydrothermal synthesis of ANA zeolite were carried out. The presented work reveals that pure Fe-Al analcime is synthesized by using starting composition with a higher iron(III) content than reported in previous publications. Furthermore, the iron(III) and nickel(II) contents play important roles in the framework of the synthesized zeolite. 759XRD, FT-IR spectroscopy, diffuse reflectance UV/Vis spectroscopy, nitrogen adsorption and SEM were used to characterize the synthesized zeolites. These investigations showed that loading of iron and nickel ions in ANA zeolite changes the pore size and morphology of analcime zeolite.

Forming zeolites and calcium silicate hydrates in Fe-rich, slag-based, porous inorganic polymers

“…The detected presence of Fe in the area where the analcime crystal is located could be explained by two hypotheses a) the incorporation of Fe 3+ in the analcime framework partially substituting Al 3+ or b) from the remaining IP binder behind the crystal. Noteworthy to mention is that according to Naser et al [26], when there is substitution of Al 3+ by Fe 3+ on the analcime, no other distinctive peaks on the XRD pattern are present, which is in agreement with the observation in Figure 11. On the other hand, if Fe 3+ would be incorporated into the analcime structure, the dspacing between crystal layers would increase, as the Fe 3+ has a higher ionic radius (i.e., ~0.63 Å) than Al 3+ (i.e., ~0.54 Å) [25].…”

Hydrothermal Dissolution of Opal in Sodium Hydroxide Lyes for the Synthesis of Water Glass

“…Additionally, it can incorporate some amounts of iron [18] and serve as adsorbent for cations [19]. The main crystalline phase precipitating during the dissolution tests was low-quartz.…”

A vibrational spectroscopic study of the silicate mineral analcime – Na2(Al4SiO4O12)·2H2O – A natural zeolite

“…The mineral analcime as well as its similar synthetic analogs are of interest due to their application in different industries, such as the removal of nuclear wastes [8], the removal of heavy metals [9,10] and in ceramics [11].…”