Surface areas and porosities of iron(III)- and iron(II)-derived oxyhydroxides

Crosby, S.A.; Glasson, D. R.; Cuttler, A. H.; Butler, Ian B.; Turner, David R.; Whitfield, M.; Millward, G.E.

doi:10.1021/es00118a004

Cited by 106 publications

(57 citation statements)

References 13 publications

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“…In the present study, the solubility measurements of am-Fe(III) in seawater indicated a rapid decrease of dissolved Fe concentrations with aging time (Fig. 4A), suggesting that am-Fe(III) in seawater solution changes to larger and more stable particles with aging time (Crosby et al 1983). In addition, lower temperature retarded the conversion to larger particles.…”

Section: Dissolution Rate and Bioavailability Of Aged Am-fe(iii)supporting

confidence: 60%

Effect of high iron concentrations on iron uptake and growth of a coastal diatom Chaetoceros sociale

Iwade¹,

Kuma

Isoda³

et al. 2006

Aquat. Microb. Ecol.

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The growth and iron uptake of the coastal marine diatom Chaetoceros sociale were experimentally measured in batch experiments at 10°C to which an acidic Fe(III) stock solution was added. The direct input of Fe(III) into the culture media induced the highest iron uptake rate (~3.4 to 4.2 × 10–16 mol Fe cell–1 d–1) by C. sociale during the first day of the incubation, resulting from the supply of bioavailable inorganic Fe(III) species at levels above its expected equilibrium value (~0.1 nmol l–1) with solid amorphous Fe(III) hydroxide in seawater. The iron uptake rate during the first day of incubation in solid amorphous Fe(III) hydroxide medium aged for 1 d at 10°C was approximately 50% lower than that in the direct Fe(III) input media. We used a modified approach in which further iron uptake by C. sociale from external iron in the direct Fe(III) input media was prevented by adding hydroxamate siderophore desferrioxamine B (DFB) during cultivation. After the addition of DFB, the highest growth rate (~0.5 to 0.6 d–1) of C. sociale by intracellularly stored Fe in the direct Fe(III) input media was maintained for a few days since no iron uptake was observed after the DFB addition. The growth rate was independent of the amount of intracellularly stored Fe. However, the maximal cell yields appeared to be relatively dependent on the amount of intracellularly stored Fe, suggesting the presence of a critical concentration of intracellular Fe (minimum cellular Fe for growth) for phytoplankton growth (~1 × 10–16 mol Fe cell–1 for C. sociale). In the present study, maximal and minimal Fe quotas were 3.4 to 4.2 × 10–16 and ~1 × 10–16 mol Fe cell–1 (the maximal/minimal Fe ratio of 3.4 to 4.2), respectively. The high iron uptake and storage capacity in C. sociale allows this species to accumulate excess iron at high concentrations of bioavailable inorganic Fe species and to support up to 1.8 to 2.1 cell divisions without any additional iron uptake. In addition, we attempted to model the effect of luxury uptake on growth, as biodilution of cellular Fe eventually decreases the Fe quota to a critical threshold

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Section: Dissolution Rate and Bioavailability Of Aged Am-fe(iii)supporting

confidence: 60%

Effect of high iron concentrations on iron uptake and growth of a coastal diatom Chaetoceros sociale

Iwade¹,

Kuma

Isoda³

et al. 2006

Aquat. Microb. Ecol.

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“…Precipitation of HFO was induced by the addition of 1 M NaOH to give a final pH of 7.5 (Crosby et al, 1983). Sulfidation experiments with HFO were then performed immediately, following degassing to remove oxygen.…”

Section: Iron (Oxyhydr)oxidesmentioning

confidence: 99%

A revised scheme for the reactivity of iron (oxyhydr)oxide minerals towards dissolved sulfide

Poulton

Krom

Raiswell

2004

Geochimica et Cosmochimica Acta

540

443

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The reaction between dissolved sulfide and synthetic iron (oxyhydr)oxide minerals was studied in artificial seawater and 0.1 M NaCl at pH 7.5 and 25°C. Electron transfer between surface-complexed sulfide and solid phase Fe(III) results in the oxidation of dissolved sulfide to elemental sulfur, and the subsequent dissolution of the surface-reduced has an effect on mineral reactivity. However, these effects are unlikely to have a significant impact on the relative reactivities of the two mineral groups.4

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“…This is in agreement to the results obtained by other researchers. For an example, Crosby et al [17] reported that the surface area of amorphous FeOOH aged for 2 h to 12 days was 159-234 m 2 /g. The Fe-Mn binary oxide has a high specific surface area of 265 m 2 /g with a pore volume of 0.47 cm 3 /g and the Fe oxide and Mn oxide of the Fe-Mn binary composite exist mainly in amorphous form [11].…”

Section: Adsorbent Characterizationmentioning

confidence: 99%

Adsorption behavior and mechanism of arsenate at Fe–Mn binary oxide/water interface

Zhang¹,

Liu²,

Liu³

et al. 2009

Journal of Hazardous Materials

213

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a b s t r a c tPreliminary study revealed that a prepared Fe-Mn binary oxide adsorbent with a Fe:Mn molar ratio of 3:1 was more effective for As(V) removal than pure amorphous FeOOH, which was unanticipated. In this paper, the As(V) adsorption capacities of Fe-Mn binary oxide and amorphous FeOOH were compared in detail. Furthermore, the adsorption behaviors as well as adsorption mechanism of As(V) at the Fe-Mn binary oxide/water interface were investigated. The higher uptake of As(V) by the Fe-Mn binary oxide may be due to its higher surface area (265 m 2 /g) and pore volume (0.47 cm 3 /g) than those of amorphous FeOOH. The As(V) adsorption process on the Fe-Mn binary oxide is endothermic and the increase of temperature is favoring its adsorption. A slight increase in the As(V) adsorption was observed with increasing ionic strength of the solution, which indicated that As(V) anions might form inner-sphere surface complexes at the oxide/water interface. The Zeta potential along with FTIR analysis confirmed further the formation of inner-sphere surface complexes between As(V) anions and the surface of Fe-Mn binary oxide. In addition, the influences of coexisting ions such as phosphate, bicarbonate, silicate, sulfate, chloride, calcium and magnesium which are generally present in groundwater on As(V) adsorption were examined. Among the tested anions, chloride and sulfate had no significant effect on As(V) removal, silicate decreased obviously the As(V) removal, while phosphate caused the greatest percentage decrease in As(V) adsorption. On the contrary, the presence of cations of Ca 2+ and Mg 2+ enhanced the adsorption of As(V).

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Surface areas and porosities of iron(III)- and iron(II)-derived oxyhydroxides

Cited by 106 publications

References 13 publications

Effect of high iron concentrations on iron uptake and growth of a coastal diatom Chaetoceros sociale

Effect of high iron concentrations on iron uptake and growth of a coastal diatom Chaetoceros sociale

A revised scheme for the reactivity of iron (oxyhydr)oxide minerals towards dissolved sulfide

Adsorption behavior and mechanism of arsenate at Fe–Mn binary oxide/water interface

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