Adsorption magnetite

Gold, chloride, adsorption, magnetite, goethite, alumina, titanium dioxide, hydrometallurgy... [Pg.1]

In their method, after co-adsorption of enzymes and magnetite nanoparticles, enzyme molecules were cross-linked via glutaraldehyde treatment. The HMMS... [Pg.141]

Magnetic separation (after precipitation as iron phosphate or after adsorption to magnetite)... [Pg.233]

Natarajan, K. A., Riemer, S. C., Iwasaki, I., 1984. Influence of pyrrhotite on the corrosive wear of grinding balls in magnetite ore grinding. Inter. J. Miner. Process, 13(1) 73-81 Nesbitt, H. W., Bancroft, G. M., Pratt, A. R., Scaini, M. J., 1998. Sulfur and iron surface states on fractured pyrite surfaces. American Mineralogist, 83 1067 - 1076 Neeraj, K. M., 2000. Kinetic studies of sulphide mineral oxidition and xanthate adsorption. Doctor thesis of Virginia Polytechnic Institute and State University. A Bell Howell Company UMI dissertation Services... [Pg.277]

Qy. = Born solvation term B = coulombic repulsion term Kh+ = adsorption constant for H ). An excellent correlation resulted between the experimentally determined and calculated pHp c for nine different solids, namely quartz, kaolinite, rutile, magnetite, goethite, hematite, corundum gibbsite and MgO. For the Fe oxides, the predicted (experimentally determined) values were magnetite 7.1 (6.6), hematite 8.47 (8.5) and goethite 9.0 (9.4). [Pg.238]

In addition to oxalate, malonate and citrate accelerate the dissolution of iron oxides in the presence of Fe (Sulzberger et al., 1989). Fe " also promotes the dissolution of magnetite in sulphuric acid (Bruyere Blesa, 1985). Small amounts of Fe in solution speed up the transformation of ferrihydrite to goethite at 50 °C (see Fig. 14.24) by promoting the dissolution of ferrihydrite (Fischer, 1972). Adsorption... [Pg.314]

In acid media (pH 2) magnetite crystals ca. 10 nm across transform topotactically to maghemite via an adsorption reaction which traps mobile electrons from the bulk material and reduces interfacial Fe the Fe ions that form are selectively leached into solution (Jolivet Tronc, 1988). Electron delocalization also induces ferrihydrite in contact with small magnetite particles to transform into a spinel layer (Belleville etal., 1992). [Pg.404]

Crystallization of ferric hydroxide into spinel by adsorption onto colloidal magnetite. [Pg.559]

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... [Pg.561]

Buxton, G.V. Rhodes,T. Sellers, R.M. (1983) Radiation chemistry of colloidal hematite and magnetite in water reductive dissolution by 1-mefhylefhanol radicals (EDTA) iron(ll). J. Chem. Soc. Faraday Trans. 1. 79 2961-2974 Bye, G.C. Howard, C.R. (1971) An examination by nitrogen adsorption of the thermal decomposition of pure and silica doped goefhite. J. Appl. Chem. Biotechnol. 21 324-329... [Pg.566]

Clarke, N.S. Hall, P.G. (1992) Adsorption of water vapour by iron oxides. 3. Inelastic incoherent neutron scattering from water adsorbed on magnetite Evidence for an icelike structure. Langmuir 8 645-649... [Pg.569]

Ghiorse.W.E. (2002) Effed of oxide formation mechanisms on lead adsorption by biogenic manganese hydroxides and their mixtures. Environ. Sci. Techn. 36 421-425 Nembrini, G. Buffle, J. Haerdi, W. (1976) Vol-tametric behavior of iron(III) hydrolyzed solutions and characterization of the reducible species. J. Colloid Interface Sci. 57 327-336 Nesson, M.H. Lowenstam, H.A. (1985) Biomineralization proceses of radula teeth of chitons. In Kirschvink, J.L. Stone, D.S. (eds.) Magnetite biomineralization and magneto reception in organisms. Plenum Press, New York, 333-363... [Pg.612]

Tamura, H. Matijevic, E. Meites, L. (1983) Adsorption of Co " ions on spherical magnetite particles. J. Colloid Interface Sci. 92 303-314... [Pg.634]

The points representing the data plotted in the coordinates log P0l vs. mass of O in the surface layer lie on a straight line. Thus the logarithmic adsorption isotherm is obeyed. A particular feature of this system is that the state of free surface, 6 — 0, corresponds to a complete removal of oxygen from the monoatomic surface layer of the Fe304 lattice and the state of occupied surface, 0 = 1, corresponds to the oxide with the stoichiometric composition in the surface layer. Thus Z in (344) is an oxygen vacancy on the surface of a magnetite crystal. [Pg.264]

The source of this discrepancy is unknown to us. Equation (349) is, undoubtedly, adequate for the description of the reaction kinetics on an iron-chromium oxide catalyst. The fact that in one of the works (124) magnetite without the addition of chromium oxide served as a catalyst can hardly be of consequence since a study of adsorption-chemical equilibrium (344) on an iron-chromium oxide catalyst (7% Cr203) (52) led to the value of the average energy of liberation of a surface oxygen atom that practically coincides with that found earlier (50) for an iron oxide catalyst with no chromium oxide. It may be suspected that in the first work (124) the catalyst was poisoned with sulfur of H2S that possibly was contained in unpurified C02... [Pg.266]

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