A structural study of the hydrated and the dimethylsulfoxide, N,N′-dimethylpropyleneurea, and N,N-dimethylthioformamide solvated iron(II) and iron(III) ions in solution and solid state

Lundberg, Dag; Ullström, Ann-Sofi; D’Angelo, P.; Persson, Ingmar

doi:10.1016/j.ica.2006.09.014

Cited by 24 publications

(12 citation statements)

References 29 publications

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“…The hydrated iron(III) ion binds six water molecules in a regular octahedron with a mean Fe–O bond distance of 1.993 Å in the solid state (Table S2) as well as in aqueous solution [ 34 ]. The structure of the octahedral hexachloroferrate complex, [FeCl 6 ] 3− , has been reported in a number of solids with a mean Fe–Cl bond distance of 2.393 Å, Table S2.…”

Section: Resultsmentioning

confidence: 99%

Ferric Chloride Complexes in Aqueous Solution: An EXAFS Study

Persson

2018

J Solution Chem

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A series of concentrated aqueous solutions of ferric chloride with different chloride:iron(III) ratios has been studied by means of EXAFS to determine the structure around the iron(III) ion of the dominating species in such solutions. The dominating species in dilute acidic aqueous solution of ferric chloride, at less than 1 mmol·dm−3, are the hydrated iron(III) and chloride ions, while in concentrated aqueous solution and in solutions with an excess of chloride ions, up to 1.0 mol·dm−3, it is the trans-[FeCl2(H2O)4]+ complex. Possible higher chloroferrate(III) or dimeric [Fe2Cl6] complexes at room temperature, as proposed in the literature, were not observed in any of the studied solutions in spite of an excess of chloride ions of 1 mol·dm−3.Electronic supplementary materialThe online version of this article (10.1007/s10953-018-0756-6) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Ferric Chloride Complexes in Aqueous Solution: An EXAFS Study

Persson

2018

J Solution Chem

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“…Table 3 summarizes some important factors regarding the ions available in BR leachate. [54][55][56][57][58][59][60][61] Ion exchange material can compete with the hydration of ions. In TiPs, Ti atoms are coordinated by phosphate groups in an octahedral manner.…”

Section: Comparison Of Am-tip With Literature Resultsmentioning

confidence: 99%

Efficient and Selective Recovery of Trace Scandium by Inorganic Titanium Phosphate Ion-Exchangers from Leachates of Waste Bauxite Residue

Zhang

Koivula

Wiikinkoski

et al. 2017

ACS Sustainable Chem. Eng.

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Bauxite residue (BR) is an inevitable industrial waste generated through the classic Bayer extraction of alumina from bauxite minerals. It contains relatively significant amount of valuable rare earth elements, including scandium, and therefore we explored the suitability of trace scandium recovery from BR acid leachate by titanium phosphate (TiP) ion exchangers. Three kinds of TiP materials (amorphous TiP, α-TiP and γ-TiP) were synthesized through fluorine-free precursors and characterized by chemical analysis, XRD, FE-SEM, FTIR, UV/Vis diffuse reflectance spectrometry, 31 P MAS NMR, TGA and potentiometric titration. The Sc 3+ exchange capacities were determined as 1.74, 0.55 and 0.22 meq g -1 for amorphous, α-and γ-TiP, respectively. Competition of major elements (Fe, Al, Ca) in BR leachate with Sc uptake was studied in batch experiments using binary equimolar mixtures, and the separation factors of Sc/Fe 2+ , Sc/Al and Sc/Ca reach the magnitudes of 10 to 1000 on amorphous TiP. 2 The high Sc 3+ selectivity by amorphous TiP was suspected to be the matching of Ti 4+ lattice radius with Sc 3+ ionic radius (both 0.745 Å). Finally, the separation of trace scandium from the simulated BR leachate solution was demonstrated on an amorphous TiP column. The interference of Fe 3+ has been partially resolved by on-column reduction using sodium sulphite. The optimized final eluate contained only Sc, Fe and Al. The concentration ratio of Sc/Fe can be increased by a factor of 8.8 and Sc/Al by 265 through a single cycle of chromatographic separation with a Sc recovery rate of 91.1%. KEY WORDSTitanium phosphate; scandium recovery; ion exchange; bauxite residue.

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“…where , and are the total, osmotic and drag water fluxes, respectively, Pos is the osmotic permeability of the membrane and βi is the hydration number of species i. Hydration numbers equal to 1 for protons, 6 for chlorides and 6 for the iron cations were considered (Lundberg et al, 2007).…”

Section: Spatial Differential Model Equationsmentioning

confidence: 99%

Experimental investigation and modeling of diffusion dialysis for HCl recovery from waste pickling solution

Gueccia

Randazzo

Martino

et al. 2019

Journal of Environmental Management

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Hydrochloric acid recovery from pickling solutions was studied by employing a batch diffusion dialysis (DD) laboratory test-rig equipped with Fumasep membranes. The effect of main operating parameters such as HCl concentration (0.1-3 M) and the presence of Fe 2+ (up to 150 g/l) was investigated to simulate the system operation with real industrial streams. The variation of HCl, Fe 2+ and water flux was identified. When only HCl is present, a recovery efficiency of 100% was reached. In the presence of FeCl2, higher acid recovery efficiencies, up to 150%, were observed due to the so-called "salt effect", which promotes the passage of acid even against its concentration gradient. A 7% leakage of FeCl2 was detected in the most severe conditions. An original analysis on water flux in DD operation has indicated that osmotic flux prevails at low HCl concentrations, while a dominant "drag flux" in the opposite direction is observed for higher HCl concentrations.

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A structural study of the hydrated and the dimethylsulfoxide, N,N′-dimethylpropyleneurea, and N,N-dimethylthioformamide solvated iron(II) and iron(III) ions in solution and solid state

Cited by 24 publications

References 29 publications

Ferric Chloride Complexes in Aqueous Solution: An EXAFS Study

Ferric Chloride Complexes in Aqueous Solution: An EXAFS Study

Efficient and Selective Recovery of Trace Scandium by Inorganic Titanium Phosphate Ion-Exchangers from Leachates of Waste Bauxite Residue

Experimental investigation and modeling of diffusion dialysis for HCl recovery from waste pickling solution

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