Iron oxides oxyhydroxide

Blesa, M.A. Maroto, A.J.G. (1986) Dissolution of metal oxides. J. chim. phys. 83 757—764 Blesa, M.A. Matijevic, E. (1989) Phase transformation of iron oxides, oxyhydroxides, and hydrous oxides in aqueous media. Adv. Colloid Interface Sci. 29 173-221 Blesa, M.A. Borghi, E.B. Maroto, A.J.G. Re-gazzoni, A.E. (1984) Adsorption of EDTA and iron-EDTA complexes on magnetite and the mechanism of dissolution of magnetite by EDTA. J. Colloid Interface Sci. 98 295-305 Blesa, M.A. Larotonda, R.M. Maroto, A.J.G. Regazzoni, A.E. (1982) Behaviour of cobalt(l 1) in aqueous suspensions of magnetite. Colloid Surf. 5 197-208... 

As iron oxides / oxyhydroxide have a very high affinity for the adsorption of anions as well as cations under natural conditions the early diagenetic reactivity of iron is often of great significance for the behavior of compounds such as trace metals, phosphate and organic acids. The adsorption on iron oxides is caused by the... 

Armstrong, J.E. 1976. Quaternary geology, stratigraphic studies and revaluation of terrain inventory maps, Fraser Lowland, British Columbia. Geological Survey of Canada, Paper 75-1, Part A, 377-380. Bowell, R.J. 1994. Sorption of arsenic by iron oxides and oxyhydroxides in soils. Applied Geochemistry, 9, 279-286. 

Ex situ Kossbauer parameters of various iron oxides and oxyhydroxides at room temperature ... 

In situ Mossbauer parameters for iron oxides and oxyhydroxides dispersed on high area Schawinigan Black carbon electrode... 

Thin films of a composite nickel-iron (9 1 Ni/Fe ratio) and iron-free oxyhydroxides were deposited from metal nitrate solutions onto Ni foils by electroprecipitation at constant current density. A comparison of the cyclic voltammetry of such films in 1M KOH at room temperature (see Fig. 6) shows that the incorporation of iron in the lattice shifts the potentials associated formally with the Ni00H/Ni(0H)2 redox processes towards negative potentials, and decreases considerably the onset potential for oxygen evolution. The oxidation peak, as shown in the voltammo-gram, is much larger than the reduction counterpart, providing evidence that within the time scale of the cyclic voltammetry, a fraction of the nickel sites remains in the oxidized state at potentials more negative than the reduction peak. 

Figure 17. Predicted Fe isotope variations produced by redox cycling of Fe due to APIO and DIR by bacteria, as envisioned from Fig. 16. The initial 6 Fe of the pool, as well as that of the influx of Fe(II), [JF n).Exi] is assumed to be zero. Solid lines show the 6 Fe values for ferric oxide/oxyhydroxide deposits as a function of solidification of the pool as an iron deposit is formed, and dashed lines show the 6 Fe values for Fe(II),. Depending upon the relative fluxes of external Fe(II), [Tpem-Ext], return of Fe(II) to the pool by DIR [Tpean Bio]. and precipitation of ferric oxide/oxyhydroxides by APIO [JF nnppd, a wide range of 6 Fe values can be produced.

Examples of electroactive NP materials discussed in the review include Ti02, Mn02, iron oxides, other metal oxides, hydroxides and oxyhydroxides and Prussian Blue. We use the term electroactive N Ps to refer to the faradaic electroactivity in such materials and to distinguish them from NPs comprised of metals (such as Au, Ag, Pt, Co, etc.) or semiconductors (such as CdS, CdSe, etc.). This distinction is based on the ability of many electroactive NPs to undergo faradaic oxidation or reduction of all of the metal (redox) centers in the NP. This is in contrast to the behavior of many metal and semiconductor NPs for which oxidation or reduction is fundamentally an interfacial, double-layer process. This deflnition is somewhat arbitrary, since the smallest metal and semiconductor NPs behave molecularly, blurring the distinction... 

De Endredy, A.S. (1963) Estimation of free iron oxides in soils and clays by a photolytic method. Clay Min. Bull. 5 209-217 de Faria, D.L.A. Venancio Silva, S. de Oliveira, M.T. (1997) Raman Microspectroscopy of some iron oxides and oxyhydroxides. J. Raman Spectrosc. 28 873-878 De Grave, E. Vandenberghe, R.E. (1986) 57Fe Mossbauer effect study of well-crystallized goethite (a-FeOOH) Hyp. Interact. 28 643-646... 

L.H. (1990) Magnetic properties of some selected, sod-related iron oxides and oxyhydroxides as probed by Fe Mossbauer spectroscopy. In Stanek, J. Pedziwiatr, A.T. (eds.) Condensed matter studies by nuclear methods. Proc. XXIV Zakopane School on Physics. 

Laberty, C. Navrotsky A. (1998) Energetics of stable and metastable low temperature iron oxides and oxyhydroxides. Geochim. Cosmo-chim. Acta 62 2905-2913 Lad, R.J. Heinrich,V.E. (1988) Structure of a-Fe203 single crystal surfaces following Ar in bombardment and annealing in O2. Surface Sci. 193 81-93... 

Liaw, B.J. Cheng, D.S. Yang, B.L. (1989) Oxidative dehydrogenation of 1-butene on iron oxyhydroxides and hydrated iron oxides. J. Catalysis 118 312-326... 

Misawa,T Hashimoto, K. Shimodaira, S. (1974) The mechanism of formation of iron oxide and oxyhydroxides in aqueous solutions at room temperature. Corrosion Sci. 14 131 — 149... 

Murad, E. Johnston, J.H. (1987) Iron oxides and oxyhydroxides. In Long, G. (ed.) Mdss-bauer spectroscopy applied to inorganic chemistry. Plenum Publ. Corp., 2 507-582 Murad, E. Rojik, P. (2003) Iron-rich precipitates in a mine drainage environment variation of mineralogy as a function of pH. Submitted to Amer. Min. 

Chem. Soc. Faraday Trans. I. 71 1623-1630 Rustad, J.R. Felmy A.R. Hay, B.P. (1996) Molecular statics calculations for iron oxide and oxyhydroxide minerals Toward a flexible model of the reactive mineral-water interface. Geochim. Cosmochim. Acta 60 1553—1562 Ryan, J.N. Gschwend, P.M. (1991) Extraction of iron oxides from sediments using reductive dissolution by titanium(III). Clays Clay Min. 39 509-518... 

Sidhu, P.S. Gilkes, R.J. Posner, A.M. (1981a) Oxidation and ejection of nickel and zinc from natural and synthetic magnetites. Soil Sci. Soc. Am. J. 45 641-644 Sidhu, P.S. Gilkes, R.J. Cornell, R.M. Posner, A.M. Quirk, J.P. (1981) Dissolution of iron oxides and oxyhydroxides in hydrochloric and perchloric acids. Clays Clay Min. 29 269-276... 

Bowell, R.J. (1994) Sorption of arsenic by iron oxides and oxyhydroxides in soils. Applied Geochemistry, 9(3), 279-86. 

Sorption on Iron Oxides and Iron Oxyhydroxides under Oxic and Anoxic Conditions... 

Since iron oxides and iron oxyhydroxides are commonly found as fracture-infilling materials, samples with a particle size of 100 to lS um were contacted with granite groundwater containing ... 

Table VI. Total Iron, Fe(II) and Sulfur. Concentrations in "Opaques" (Ilmenite, Iron Oxides, and Iron Oxyhydroxides used in Technetium Sorption Studies Concentrations in wt%...

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