Ultra dispersed particles of Fe(III) compounds in the strongly basic crosslinked ionic polymer-precursors for new sorbents and catalysts

Gutsanu, Vasile; Schiţco, Cristina; Lisă, Gabriela; Turta, Constantin

doi:10.1016/j.matchemphys.2011.08.007

Cited by 6 publications

(11 citation statements)

References 16 publications

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“…4 it is visible that the iron particles are dispersed on the surface of mPGME and mPGME-deta particles. The similar was observed for crosslinked ionic polymers containing strongly 31 and magnetic copolymer obtained from suspension polymerization of styrene and divinylbenzene. 11 Highly developed internal porous structure is advantageous for the metal ions sorption due to the decrease of the mass transfer resistance, facilitation of the metal ions diffusion which consequently provides high adsorption rate and capacity.…”

Section: Characterization Of Mpgme and Mpgme-detasupporting

confidence: 81%

A novel macroporous polymer–inorganic nanocomposite as a sorbent for pertechnetate ions

et al. 2017

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Section: Characterization Of Mpgme and Mpgme-detasupporting

confidence: 81%

A novel macroporous polymer–inorganic nanocomposite as a sorbent for pertechnetate ions

et al. 2017

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“…In the previous papers, we have demonstrated that the jarosite type compounds of Fe(III) in the phase of strongly basic anion exchangers are in the form of ultrafine solid particles. It is naturally to assume that compounds of Cr(III) within the AV‐17(Cr) sorbent phase are also in the form of ultrafine particles.…”

Section: Resultsmentioning

confidence: 99%

“…Through various methods metal compounds in the polymer phase can be converted to other compounds. For example, the mineral type compounds in the polymer phase in boiling water are converted into β‐FeOOH ultrafine particles in super paramagnetic state or in relatively massive and magnetically ordered particles . While the synthetic jarosite type Na[Fe 3 (OH) 6 (SO 4 ) 2 ] compounds upon heating in water ( t > 80°C), are converted into highly dispersed α‐FeOOH particles.…”

Section: Introductionmentioning

confidence: 99%

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Sorption and thermal properties of strongly basic cross‐linked ionic polymer modified with Cr(III) compounds

Gutsanu

Lisă

Vizir

et al. 2014

J of Applied Polymer Sci

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AV-17(Cr) material was prepared by modifying a commercial polymer AV-17 (initially bearing R4N 1 functional groups) with Cr(III) compounds was investigated. Comparative isotherms characterizing the CrO 22 4 and Cr 2 O 22 7 ion sorption from solution with pH values of 3 and 8, respectively, at 19 C and 60 C, were obtained using the raw AV-17(Cl) and the modified AV-17(Cr) material. The sorption process on AV-17(Cr) takes place through the coordination of Cr(VI) ions with Cr(III) ions, while on AV-17(Cl) it is due to an ion exchange mechanism. The sorption isotherms obtained in pH 8 solutions fit perfectly the Langmuir model. The thermodynamic functions DG, DH, and DS characteristic to the adsorption of CrO 22 4 ions from K 2 CrO 4 solutions with pH 5 8 were calculated. The active sites belonging to the AV-17(Cr) material were identified as jarosite type compounds of Cr(III). SEM images show that the Cr(III) compounds are present in the form of ultrafine particles located on the surface and within the bulk phase of the polymer granules. Comparative thermal degradation process of both the AV-17(Cr) and the AV-17(Cl) material was conducted in air and in an inert atmosphere (He). The thermal degradation mechanism of sorbent AV-17(Cr) and exchanger AV-17(Cl) is proposed.

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“…A portion of β-FeOOH particles remains in the highly dispersed superparamagnetic state distributed in the narrow pores of the polymer. 6,9 The jarosite-type compounds in the polymer phase are non-crystalline, and the state of metal in the compounds depends upon many factors. 9 With investigation of the formation of Fe−jarosite in the polymer phase, we have noticed that a part of the Fe 3+ cations is reduced to Fe 2+ .…”

Section: Introductionmentioning

confidence: 99%

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

Gutsanu

2018

ACS Earth Space Chem.

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The formation of nitrogen compounds by chemical fixing of atmospheric nitrogen in ambient conditions in only one technological step is of particular interest for the chemical industry and science. The effect is achieved by air bubbling through the reactor containing a cross-linked ionic polymer with strongly basic functional groups and sulfate solution of a trivalent metal. The lower the temperature of the reactor, the higher the yield production of nitrogen compounds. In the polymer phase, jarosite-type compound formation occurs that participates in the redox processes, followed by the partial destruction and synthesis of nitrogen compounds. The results from this work demonstrate that, under certain conditions, systems containing a strongly basic cross-linked polymer and solution of three valence metal sulfates (Fe3+, Ga3+, and others) are able to generate nitrogen-containing compounds, using atmospheric nitrogen. The spontaneous and uncontrolled processes of nitrogen compound generation could occur in nature, which would explain the stability of some minerals on Earth and even Mars.

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Ultra dispersed particles of Fe(III) compounds in the strongly basic crosslinked ionic polymer-precursors for new sorbents and catalysts

Cited by 6 publications

References 16 publications

A novel macroporous polymer–inorganic nanocomposite as a sorbent for pertechnetate ions

A novel macroporous polymer–inorganic nanocomposite as a sorbent for pertechnetate ions

Sorption and thermal properties of strongly basic cross‐linked ionic polymer modified with Cr(III) compounds

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

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