The thermochemical changes taking place in the phase of a Fe(III)-containing strongly basic anion exchanger (AV-17) are investigated by using Mössbauer, IR, and EPR spectroscopy. During the heating of Fe(III)-containing resin in air up to 200°C, redox processes in the polymer phase take place. On boiling in water, the jarosite-type compounds in the polymer are converted into higher dispersed β-FeOOH particles. After sorption–boiling in water cycles in the polymer phase, relatively massive and magnetically ordered β-FeOOH particles are formed. A portion of the β-FeOOH particles remains in the highly dispersed superparamagnetic state distributed in the narrow pores of the exchanger. It is suggested that the Fe(III) ion sorption from Fe2(SO4)3 solutions by an exchanger takes place through the formation in the polymer phase of solid ultrafine particles of jarosite mineral-type compounds. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 59–64, 2006
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