Iron surface chemistry

Gao, F., Kotvis, P.V., Stacchiola, D., Tysoe, W.T. Reaction of tributyl phosphate with oxidized iron surface chemistry and tribological significance. Tribol. Lett. 18, 377-384 (2005). doi 10.1007/sl 1249-004-2768-1... 

Wachtershanser has also suggested that early metabolic processes first occurred on the surface of pyrite and other related mineral materials. The iron-sulfur chemistry that prevailed on these mineral surfaces may have influenced the evolution of the iron-sulfur proteins that control and catalyze many reactions in modern pathways (including the succinate dehydrogenase and aconitase reactions of the TCA cycle). 

An indication of growing interdisciplinary interest in the field is illustrated in a review on new perspectives in surface chemistry and catalysis by Roberts (.160), who discussed the interaction of N2 with iron surfaces. In so doing, he referred to the Fe (N2) , matrix Mdssbauer work of Barrett and Montano (7), which showed that molecular nitrogen only bonds to iron when the latter is present as a dimer. As the chemisorption studies (161) indicated that N2 is absorbed on singleatom sites, Roberts suggested (160), of the matrix data (7), "if this is correct, then our assignment of the N(ls) peak at 405 eV to end-on chemisorbed N2 will require further investigation. Other reviews that consider matrix-isolation techniques for chemisorption simulation are collected in footnote a. 

Fig. 15-5 Comparative adsorption of several metals onto amorphous iron oxyhydroxide systems containing 10 M Fej and 0.1 m NaNOs. (a) Effect of solution pH on sorption of uncomplexed metals, (b) Comparison of binding constants for formation of soluble Me-OH complexes and formation of surface Me-O-Si complexes i.e. sorption onto Si02 particles, (c) Effect of solution pH on sorption of oxyanionic metals. (Figures (a), (c) reprinted with permission from Manzione, M. A. and Merrill, D. T. (1989). "Trace Metal Removal by Iron Coprecipitation Field Evaluation," EPRI report GS-6438, Electric Power Research Institute, California. Figure (b) reprinted with permission from Balistrieri, L. et al. (1981). Scavenging residence times of trace metals and surface chemistry of sinking particles in the deep ocean, Deep-Sea Res. 28A 101-121, Pergamon Press.)...

As pointed out by Sposito (1984) this equation initiated the surface chemistry of naturally occurring solids. Maarten van Bemmelen published this equation (now referred to as the Freundlich isotherm) more than 100 years ago and distilled from his results, that the adsorptive power of ordinary soils depends on the colloidal silicates, humus, silica, and iron oxides they contain. 

Schneider, W., and B. Schwyn (1987), "The Hydrolysis of Iron in Synthetic, Biological and Aquatic Media", in W. Stumm, Ed., Aquatic Surface Chemistry, John Wiley and Sons, New York, 167-196. 

Core and valence level photoemission studies of iron oxide surfaces and the oxidation of iron. Surface Sd. 68 459—468 Bruno, J. Sturam, J.A. Wersin, P. Brand-berg, E. (1992) On the influence of carbonate on mineral dissolutions I. The thermodynamics and kinetics of hematite dissolution in bicarbonate solutions at T = 25°C. Geo-chim. Cosmochim. Acta 56 1139—1147 Brusic.V. (1979) Ferrous passivation. In Corrosion Chemistry, 153—184 Bruun Hansen, H.C. Raben-Lange, R. Rau-lund-Rasmussen, K. Borggaard, O.K. 

Liang, L. (1988) Effects of surface chemistry on the kinetics of coagulation of submicron iron oxide particles (a-Fe203) in water. Ph.D. Thesis Caltech. USA... 

McBride, M.B. (1997) A critique of diffuse double layers applied to colloid and surface chemistry. Clays Clay Min. 45 598-608 McBride, M.B., Goodman, B.A., Russel, J.D., Fraser, A.R., Farmer,V.C. Dickson, D.P.E. (1983) Characterization of iron in alkaline EDTA and NH4OH extracts of podzols. J. Soil Sd. 34 825-840... 

Schneider, W. Schwyn, B. (1987) The hydrolysis of iron in synthetic, biological, and aquatic media. In Stumm,W. (ed.) Aquatic surface chemistry. Wiley Interscience, New York, 167-194... 

Somorjai, G.A. Salmeron, M. (1986) Surface properties of catalysts. Iron and its oxides. Surface chemistry, photochemistry and catalysis. In Pelizzetti, E. Serpone, N. (eds.) Homogeneous and heterogeneous photocatalysis. D. Reidel Publ. Co., Doordrecht, The Netherlands, NATO ASI Series C, 174 445-478... 

Since this book first appeared, there have been hundreds of neiv publications on the subject of iron oxides. These have covered a wide range of disciplines including surface chemistry, the geosciences, mineralogy, environmental science and various branches of technology. In view of the amount of new material that is available, we decided, that once the copies of the first edition were exhausted, we would prepare a second edition that would incorporate the new developments. 

This book is aimed at collecting all aspects of the information about iron oxides into one compact volume. It provides a coherent text with a maximum of homogeneity and minimum overlap between chapters. It is structured according to topics, i. e. surface chemistry, dissolution behaviour, adsorption etc. For each topic a general introduction is followed by a section which reviews current knowledge concerning the different iron oxides. The latter section includes much detailed information and recent data from the authors own laboratories. As this is intended to be a handbook, an extensive list of references to help the reader expand various details is provided. We have also indicated some of the numerous opportunities for further research in this field. 

In the current study, we tested the applicability of near infrared spectroscopy coupled with correlation analysis to quantitation of the dependence of montmorillonite spectra on two of the structural features known to be of importance in clay surface chemistry -hydration and exchangeable iron. These clays were... 

See, for example, J. Steinhardt and J. A. Reynolds, Multiple Equilibria in Proteins, Academic Press, 1969 K. S. Murray, Binuclear oxo-bridged iron(III) complexes, Coord. Chem. Rev. 12 1 (1974) W. Schneider and B. Schwyn, The hydrolysis of iron in synthetic, biological, and aquatic media, pp. 167-196, in Aquatic Surface Chemistry, ed. by W. Stumm, Wiley, New York, 1987 and P. M. Bertsch, Aqueous polynuclear aluminum species, pp. 87 115 in The Environmental Chemistry of Aluminum, ed. by G. Spnsitn, CRC Press, Boca Raton, FL, 1989. 

Fig. 6.8. Log-log plot of Wrap versus electrolyte concentration for hematite ( Fe203) colloids suspended in either CaCl2 or NaCI solution at pH 10.5. Arrows indicate critical coagulation concentrations [Eq. 6.76 data from L Liang, Effects of surface chemistry on kinetics of coagulation of submicron iron oxide particles (a-Fe2Oi) in water, Ph.D. dissertation, California Institute of Technology, Pasadena, CA, 1988. Environmental Quality Laboratory Report No. AC-5-88].

L. Liang, Effects of Surface Chemistry on Kinetics of Coagulation of Submicron Iron Oxide Particles in Water, Ph.D. Thesis, California Institute of Technology, Pasadena, California, 1988. 

Weiss W, Ranke W. Surface chemistry and catalysis on well-defined epitaxial iron-oxide layers. Prog Surf Sci. 2002 70 1-151. 

Flade, Friedrich — (Sep. 16, 1880, Arolsen, now Bad Arolsen, Germany - Sep. 5, 1916, near Manancourt, France) After studies of chemistry in Halle and Munich, Flade received his PhD in 1906 from the University of Marburg, Germany. There he qualified as University teacher (habilitation) in 1910 [i], Flade observed that iron shows a sudden potential change when it goes from the passive to the active state. Now, the electrode potential of a metal where the current associated with the anodic metal dissolution drops to very small values bears his name (- potential, subentry -> Flade potential). He also showed that loading of the iron surface with oxygen is essential for its -> passivation [ii—vi]. Flade fell in World War I in the Battle of the Somme, and he was buried in Manancourt, France. 

The most commonly reported solid forms of iron and manganese oxides in marine sediments and ferromanganese nodules are goethite (aFeOOH) and hydrous manganese dioxide (bimessite, todorokite and 6Mn02) (, . The surface chemistry of... 

Results presented in this paper show that differences in the chemical composition of sewage sludge derived adsorbents lead to differences in their performance as adsorbents of acidic gases. It has been demonstrated that however some adsorption centers can be common for both gases, there are surface features on the sample pyrolized at 950 C which favor oxidation of hydrogen sulfide to elemental sulfur. This is likely due to the catalytic action of the iron species. When adsorption of SOj takes part calcium species play a crucial role. Surface chemistry has also its effect on the physical form of sulfur deposited on the surface. It is either rhombic or monoclinic depending on the pyrolysis temperature and chemical changes imposed by heat treatment. 

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