Unforseen factors influencing Fe(III)‐containing cations sorption on strongly basic anion exchangers

Abstract

The sorption and partial destruction of the Fe(III)-containing compounds in the aqueous medium in strongly basic anion exchangers AV-17 and Varion-AD phase have been investigated. It is shown that partial destruction of the Fe (III) compounds in acidulated water (pH 5 2) and in K 2 SO 4 , Fe 2 (SO 4 ) 3 solutions takes place. With increasing of temperature up to 508C, the desorption degree of the iron ions from polymer phase decreases. In dried polymer, the structural and electronic state of iron compounds, according to their magnetic susceptibility, remains stable for a long time. The sorption of the Fe(III)-containing cations at 508C during 12 h depends essentially on the sizes of polymer granules. Sorption increases with growing of polymer granules. For comparison of sorptional capacities, the sorption of Fe(III)-containing cations was determined on different cation and anion exchangers.

Some metal compounds in the phase of crosslinked ionic polymer—precursors for new sorbents and catalysts

“…The processes (1) and (2) are accompanied with passing a part of metallic cations from polymer to liquid phase 16. But, as it is seen in Table I, obtaining of AV‐17(Bi,FeOOH) sample on heating in water medium of AV‐17(Bi,Fe) sample is not accompanied with iron ions lost.…”

“…The processes (1) and (2) are accompanied with passing a part of metallic cations from polymer to liquid phase. 16 But, as it is seen in Table I, (3) and (4):…”

Chemical–Mineralogical Systems That Are Able To Generate Nitrogen Compounds on Earth and Even Mars

“…After interruption of the process of formation of the jarositetype compounds by separating the polymer from solution for 10 h after 2.5 h and placing it again in solution, the content of Fe 3+ in the polymer phase has decreased. 8 Because in the solution of Fe 2 (SO 4 ) 3 , which has been in contact with the polymer, no NO 3 − ions were found, we consider that in the system, nitrogen oxides NO x were initially formed, which were then converted into nitric acid.…”

“…In addition, this is confirmed by the formation of Fe 2+ ions in the system. 8 The Fe 2+ ions are not able to form jarosite-type compounds; therefore, in the result of the redox processes in the polymer phase, decomposition of iron(III) compounds takes place.…”

“…Therefore, theoretically, they are not able to interact with inorganic cations from solution and adsorb them. However, in our previous study, − it was shown that, in certain conditions, these polymers may interact with cations in M 2 (SO 4 ) 3 solutions, where M is Fe 3+ , Al 3+ , Cr 3+ , Ga 3+ , or In 3+ . From MCl 3 or M­(NO 3 ) 3 solutions, the sorption of cations does not take place.…”