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- W78156937 abstract "Goethite is the most widespread iron oxide in natural environments. Many studies of natural Fe oxides indicate the association of many foreign cations like Al, Cr, Ni, Co, Cu, Zn, Mn, which may be present as substitutes for Fe in the structure of goethite. Substitution of other cations in goethite may influence the crystal habit, crystal size, crystallinity and chemical composition. These crystal properties are of great significance as they may modify the surface properties of iron oxides and consequently affect the specific sorption of cations and anions. This research was aimed to study the crystal and chemical properties of some Cu and Cd substituted goethites. A series of Cu (nominal mol % between 0-15) and Cd-substituted goethites (nominal mol % between 0-16) were prepared by mixing 250 ml of 1 M ferric nitrate and predetermined volume of 1 M metal nitrate solution with 600 ml of 5 M KOH to obtain solution pH >13. The solutions were aged at ambient temperature (~25°C) for 16 days while maintaining the solution pH -13. The amorphous and poorly crystalline fraction of the precipitate was removed by giving 5 sequential extractions in ammonium oxalate solution in the dark using a solid solution ratio of 1:200 and shaking time of 2 h. The oxalate extraction dissolved 100% of the precipitates for samples containing more than 4 mol% nominal Cu substitutions. The precipitates were characterised by synchrotron x-ray diffraction, Fourier transform infrared spectroscopy, thermal gravimetric analysis, and transmission electron microscopy (TEM). The maximum level of Cu2+ substitution was found to be ~3% which induced increase in the unit-cell parameters, except for a which increased presumably as a consequence of the Jahn-Teller effect (elongation of axial bonds). Furthermore a change from lath to acicular crystals was observed in both the diffraction data and the TEM images, as a result of copper substitution." @default.
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- W78156937 date "2002-01-01" @default.
- W78156937 modified "2023-09-25" @default.
- W78156937 title "Studies of synthetic copper containing goethite" @default.
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