On an X-Ray and Electron Microscope Study of Precipitates Formed by the Hydrolysis of Iron(III) in 0.5 M NaCl Ionic Medium.

Söderquist, Rune; Jansson, Samuel; Albriktsen, Per; Hofsten, Bengt von; Williams, D. H.; Bunnenberg, E.; Djerassi, Carl; Records, Ruth

doi:10.3891/acta.chem.scand.20-1417

Cited by 14 publications

(4 citation statements)

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“…An amount equal to ~ 5~o of the expected final mass of FeOOH was used. Other preparations of fl-FeOOH, having the larger spindle shaped crystal morphology (Gallagher, 1970;Mackay, 1960;Soderquist and Jansson, 1966;Wolf et al, 1967), were made from dilute iron(Ill) chloride solutions (0.04 M) without added base which was allowed to stand at 65~ (10 days) or room temperature (3 months). Other details, and methods used for XRD, electron microscopy and electron diffraction, are given by Atkinson et al (1968).…”

Section: Methodsmentioning

confidence: 99%

“…Akaganeite (fl-FeOOH) is formed from aqueous iron(III) chloride solutions, under a wide range of conditions of hydrolysis, including dilute or concentrated solutions, with base additions ranging from zero up to OH/Fe mole ratio about 2.8, at room temperature or at elevated temperatures (Feitknecht and Michaelis, 1962;Fordham, 1970;Knight and Sylva, 1974;Mackay, 1960;Murphy et al, 1975;Soderquist and Jansson, 1966;Wolf et al, 1967).…”

Section: Introductionmentioning

confidence: 99%

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Crystal Nucleation and Growth in Hydrolysing Iron(III) Chloride Solutions

Atkinson

1977

Clays and clay miner.

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S.5 molal iron(ilI) chloride solutions were hydrolysed at room temperature by base additions in the range OH/Fe mole ratio (~2.75. After an ageing period the hydrolysed solutions were used to produce amorphous hydroxide gels from which crystalline products were grown at 65~ at low pH or high pH. Examination of crystal composition and morphology and comparison with similarly treated nitrate solutions showed that the nucleation of hematite and goethite is inhibited in chloride containing solutions, which allow growth of small rod shaped fl-FeOOH to predominate or occur exclusively in gels at pH 1 2. The addition of seed crystals of hematite and goethite allows competitive growth of all three minerals. The transformations fl-FeOOH ~ a-Fe203 and fl-FeOOH ~ a-FeOOH at pH 1-2 proceed by dissolution and reprecipitation and are promoted by adding seed crystals.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crystal Nucleation and Growth in Hydrolysing Iron(III) Chloride Solutions

Atkinson

1977

Clays and clay miner.

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“…As will be discussed later, the final product of this system was a single crystalline phase of akaganeite. The synthesis and prop- (Mackay, 1960(Mackay, , 1962Soderquist and Jansson, 1966;Paterson and Tait, 1977;Gonz~lez-Calbet et aL, 1981;Borggaard, 1983), however, to our best knowledge this is the first report of the fast formation of akaganeite near the ambient temperature of acidic environment. Our research indicates that the presence of A1 ions play an important role in the hydrolysis of Fe under acidic conditions.…”

Section: Hydrolytic Processes and Productsmentioning

confidence: 91%

Effect of the Presence of Aluminum Ions in Iron Solutions on the Formation of Iron Oxyhydroxides (FeOOH) at Room Temperature Under Acidic Environment

Singh¹,

Kodama

1994

Clays and clay miner.

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Abstract--The hydrolytic behavior of Fe solutions at room temperature under acidic conditions was investigated. In the presence of A1 ions, with C1 and NO3 as associated anions, the Fe hydrolysis began almost instantaneously and a crystalline 3-FeOOH (akaganeite) was formed in the AIC13/FeC13 system within a short period. Initially the particles were small with large surface area. However, with time the particles grew in size and the surface area decreased. After about 42 days of equilibration, the akaganeite particles grew to 60-300 nm long, 10-50 nm wide and with a surface area of 55 m2/g, which is similar to other reports for akaganeite prepared at higher temperatures. In the NO3 system [AI(NO3)3/Fe(NO3)3], lepidocrocite (y-FeOOH) and goethite (a-FeOOH) were formed. In a mixed anion system (C1/NO3) solid phases identified were akaganeite (fl-FeOOH) and lepidocrocite (3,-FeOOH). The introduction of polynuclear hydroxy-A1 along with monomer A1 in C1 and NO3 systems of Fe affected the quantity and quality of the solid phase. The crystallinity of 3-FeOOH formed in the presence of polynuclear hydroxy-A1 ions in a Cl-system was more disordered than when it formed in the presence of monomer Al-ions alone. In NO3 systems, polynuclear hydroxy-A1 hindered the formation of goethite (a-FeOOH). Our experiments showed that Fe oxyhydroxides crystallize readily under acidic conditions in the presence of A1 ions and the data also indicated that the C1 was essential for the crystallization of akaganeite, whereas goethite was formed in those systems when C1 was absent.

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“…Laboratory experiments have shown that the C1 concentration (0.55 tool kg l) of normal sea water is sufficient for the exclusive precipitation of the crystalline polymorph B-FeOOH during oxidation of Fe (II) to Fe (III) (S6derquist and Jansson, 1966). However, normal sea water is different from laboratory brines in that it is not biologically sterile.…”

Section: Introductionmentioning

confidence: 99%

Possible biological origin of banded iron — Formations from hydrothermal solutions

Holm

1987

Origins Life Evol Biosphere

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Abslracl. A combined hydrothermal/biogenic model is suggested for the origin of banded Fe-formation. The model is mainly based on the distribution of trace elements such as Mn, Co, Cu, Zn, and P in modern biogenic metalliferous sediments and Proterozoic banded iron-formations, but also on carbon isotope data of both carbonates and reduced elemental carbon. One of the characteristics of banded Feformations is that they are poor in trace elements. An argument in favour of a combined hydrothermal/biogenic model would therefore be that some of the modern analogues, too, are associated with very little trace elements. Such sediments are microbiologically precipitated in areas with restricted water circulation and limited amounts of free oxygen, which favours the oxidation of reduced Fe by microaerophilic chemolithotrophic bacteria relative to inorganic oxidation. The biological enzymatic pathway for the oxidation excludes the participation and co-precipitation of transition metals other than iron until the original amorphous Fe oxide hydroxide precipitate is transformed to the crystalline polymorphs. The wide lateral microband continuity of many banded Fe-formations could be explained by injection, interleaving and horizontal spreading of chemically reduced hydrothermal solutions in an early ocean with limited amounts of free 02. Due to the low 0 2 concentrations Fe would be precipitated slowly as an effect of mainly microbiological oxidation. Periods of Fe precipitation from hot hydrothermal solutions would alternate with periods of precipitation of silica from cool hydrothermal solutions.

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On an X-Ray and Electron Microscope Study of Precipitates Formed by the Hydrolysis of Iron(III) in 0.5 M NaCl Ionic Medium.

Cited by 14 publications

References 0 publications

Crystal Nucleation and Growth in Hydrolysing Iron(III) Chloride Solutions

Crystal Nucleation and Growth in Hydrolysing Iron(III) Chloride Solutions

Effect of the Presence of Aluminum Ions in Iron Solutions on the Formation of Iron Oxyhydroxides (FeOOH) at Room Temperature Under Acidic Environment

Possible biological origin of banded iron — Formations from hydrothermal solutions

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