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

Abstract

A commercial crosslinked ionic polymer AV-17 containing AN(CH 3 ) 3 Cl groups was used. The common compounds of Bi(III) and Al(III); Bi(III) and Cr(III); Bi(III) and Fe(III); Bi(III) and FeOOH and of three components-Bi(III), Fe(III), and Cr(III); Bi(III), FeOOH, and Cr(III) were obtained in the AV-17 polymer phase and investigated using scanning electron microscopy, powder X-ray diffraction, thermogravimetric analysis, and Fourier-transform infrared spectroscopy. It was shown that metal-containing compounds were concentrated on the surface of the polymer granules. The compounds were in the crystalline (BiOCl) or amorphous (jarosites and oxihydroxides) state. The morphology and composition of the metal-containing ultra dispersed particles were different on the surface and in the volume of the polymer granule. Most of the metalcontaining compounds were in the form of pseudo spherical particles, but compounds containing Bi(III) and FeOOH in the volume of AV-17 granule, were in the form of clew of nanometer fibers. Thermogravimetric analysis (in an N 2 atmosphere) in the range 24-1000 C of the metallic compounds containing polymer was also carried out. The metal-containing polymer samples were stable up to 120 C.

Iodide Ions Sorption on Polymer AV-17(Cl) and Sorbent AV-17(Bi)

“…After 5 h of contacting time the polymer sample was separated by fi ltration, washed with distilled water and dried in air. The polymer modifi ed with Bi(III) compounds contains crystalline BiOCl and amorphous BiOOH [9]. The Bi content (25.3 mg Bi/g) in the prepared sorbent AV-17(Bi) was determined photocolorimetrically [12] after desorption with HNO 3 solution.…”

“…It would seem that in the similar conditions maximal iodide ions sorption on AV-17(Bi) must be larger than on the AV-17(Cl) because in the fi rst sorbent there are R 4 NNO 3 and Bi(III)-containing sorption centers and in the AV-17(Cl) there are only R 4 NCl centers. It can be explained by the fact that a part of Bi(III) compounds are situated on R 4 NNO 3 groups and block the iodine ions access to them [9].…”