On the stoichiometry and pourbaix diagram of Fe(II)-Fe(III) hydroxy-sulphate or sulphate-containing green rust 2: An electrochemical and Mössbauer spectroscopy study

Génin, J.‐M. R.; Olowe, A. A.; Refait, Philippe; Simon, Larry J.

doi:10.1016/s0010-938x(96)00072-8

Cited by 153 publications

(80 citation statements)

References 8 publications

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“…The transformation of GR2 to lepidocrocite is controlled by the relative concentration of SO4 2− , where Eh = 0.55 + 0.0148 log [SO4 2− ] − 0.089 pH [166]. The relative position of this redox boundary is shown in Figure 22.…”

Section: Impact Of Sulphates: Zvm Tp and Zvm Tpamentioning

confidence: 99%

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Desalination of Water Using ZVI (Fe0)

Antia¹

2015

Water

196

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Batch treatment of water (0.2 to 240 L) using Fe 0 (44,000-77,000 nm) in a diffusion environment operated (at −8 to 25 °C) using: (a) no external energy; (b) pressurized (<0.1 MPa) air; (c) pressurized (<0.1 MPa) acidic gas (CO2); (d) pressurized (<0.1 MPa) anoxic gas (N2); (e) pressurized (<0.1 MPa) anoxic, acidic, reducing gas (H2 + CO + CO2 + CH4 + N2), reduces the salinity of water. Desalination costs increase with increasing NaCl removal. The cost of reducing water salinity from: (i) 2.65 to 1.55 g·L . Desalination is accompanied by the removal, from the water, of one or more of: nitrate, chloride, fluoride, sulphate, phosphate, As, B, Ba, Ca, Cd, Co, Cu, Fe, Mg, Mn, Na, Ni, P, S, Si, Sr, Zn. The rate of desalination is enhanced by increasing temperatures and increasing HCO3 − /CO3 2− concentrations. The rate of desalination decreases with increasing SO4 2− removal under acidic, or pH neutral, operating conditions.

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Section: Impact Of Sulphates: Zvm Tp and Zvm Tpamentioning

confidence: 99%

“…The FeOOH chemistry is complex. In the absence of Cl − ions, lepidocrocite forms [166]. In the absence of SO4 2− ions, akaganeite forms, e.g., [167].…”

Section: Impact Of Sulphates: Zvm Tp and Zvm Tpamentioning

confidence: 99%

Desalination of Water Using ZVI (Fe0)

Antia¹

2015

Water

196

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“…In the case of the constant feeding rate (= 5 ml/min), the sizes of magnetite nanoparticles decreased with the decreasing of the concentration of [24,25]. The formation of magnetite depend on the oxidation rate of green rust, which is formed between ii) and iii) [26].…”

Section: Resultsmentioning

confidence: 96%

Preparation of superparamagnetic magnetite nanoparticles by reverse precipitation method: Contribution of sonochemically generated oxidants

Mizukoshi

Shuto

Masahashi

et al. 2009

Ultrasonics Sonochemistry

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Magnetic iron oxide nanoparticles were successfully prepared by a novel reverse precipitation method with the irradiation of ultrasound. TEM, XRD and SQUID analyses showed that the formed particles were magnetite (Fe3O4) with about 10 nm in their diameter. The magnetite nanoparticles exhibited superparamagnetism above 200 K, and the saturation magnetization was 32.8 emu/g at 300 K. The sizes and size distributions could be controlled by the feeding conditions of FeSO4·7H2O aqueous solution, and slower feeding rate and lower concentration lead to smaller and more uniform magnetite nanoparticles. The mechanisms of sonochemical oxidation were also discussed. The analyses of sonochemically produced oxidants in the presence of various gases suggested that besides sonochemically formed hydrogen peroxide, nitrite and nitrate ions contributed to Fe(II) ion oxidation.

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“…The octahedral sheets are separated by interlayers containing water and chargebalancing anions (see Genin et al, 2006, and references cited therein). At the time of their initial characterization (Bernal et al, 1959;Dasgupta and Mackay, 1959), it was found that green rusts could be characterized by two distinct structures; (1) a rhombohedral form designated as GR-I, which contained simple charge-balancing anions such as OH Earlier work concluded that green rusts occupy a stability field in Eh-pH space defined by neutral to weakly acid pH and moderately reducing (anoxic) conditions (Refait and Genin, 1993;Drissi et al, 1995;Genin et al, 1996Genin et al, , 1998Ruby et al, 2006). Other minerals that might also be associated with green rusts, depending on the concentration of Fe(T) and SO 4 -2 in the system, and fluctuations in oxidations state include hydroxy-magnetite or magnetite (Olowe and Genin, 1991), schwertmannite and ferrihydrite (Majzlan et al, 2004), these latter phases principally occupying stability fields at higher Eh, and where the phase boundary between schwertmannite and ferrihydrite falls within a pH range close to 7.0.…”

Section: Estimation Of the Solubility Product Of Fougeritementioning

confidence: 99%