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Now showing items 14065-14084 of 39375
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(1999)Colloidal hematite (α-Fe2O3) is used as model solid to investigate the kinetic effect of specific adsorption interactions on the chemical reduction of uranyl (UVIO22+) by ferrous iron. Acid-base titrations and Fe(II) and ...
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(2001)The empirical rate laws formulated to describe the dissolution rates of oxide minerals include the surface charge concentration that results from the protonation and deprotonation of surface functional groups. Previous ...
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(2005)The surface charge density of colloidal SiO2 (Aerosil 380) was measured in alkali chloride (0.067 and 0.20 M LiCl, NaCl, and KCl) and alkaline earth chloride (0.067 M MgCl2, CaCl2, SrCl2, BaCl2) solutions. Measurements ...
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(1998)The isoelectric points, pHi.e.p., of ZnS, PbS, CuFeS2, FeS, FeS2, NiS2, CoS2, and MnS2 in NaCl supported electrolyte solutions are estimated to be between pH 3.3 and 0.6, with most of the isoelectric points below pH 2. The ...
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(1998)This study characterizes the surface chemistry and morphology of poorly crystalline iron sulfides precipitated in a chemically defined growth media for sulfate-reducing bacteria. The precipitates were analyzed by X-ray ...
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(2004)The surface binding site characteristics and Ni sorptive capacities of synthesized hydrous Mn oxyhydroxides experimentally conditioned to represent three hydrological conditions-MnOXW, freshly precipitated; MnOXD, dried ...
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(2002)Tetragonal FeS1-x mackinawite, has been synthesized by reacting metallic iron with a sodium sulfide solution and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), transmission Mossbauer ...
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(2005)Disordered mackinawite, FeS, is the first formed iron sulfide in ambient sulfidic environments and has a highly reactive surface. In this study, the solubility and surface chemistry of FeS is described. Its solubility in ...
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(2001)Adsorption of organic ligands to the surfaces of minerals is a ubiquitous environmental process that often regulates interfacial aqueous chemistry. In the current work, the infrared spectra of dicarboxylate ligands adsorbed ...
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(2002)''Two-line'' ferrihydrite samples precipitated and then exposed to a range of aqueous Zn solutions (10-5 to 10-3 M), and also coprecipitated in similar Zn solutions (pH 6.5), have been examined by Zn and Fe K-edge X-ray ...
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(2003)X-ray absorption near-edge spectroscopy (XANES) analysis of sorption complexes has the advantages of high sensitivity (10- to 20-fold greater than extended X-ray absorption fine structure [EXAFS] analysis) and relative ...
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(1996)Calcium and magnesium adsorb in near-stoichiometric proportions to dolomite over wide ranges in [Ca2+]2+], ionic strength, and solution composition pointing to minimal mixing of metal cations between the CaCO3 and MgCO3 ...
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(2005)We measured the adsorption of Cu(II) onto kaolinite from pH 3–7 at constant ionic strength. EXAFS spectra show that Cu(II) adsorbs as (CuO4Hn)n−6 and binuclear (Cu2O6Hn)n−8 inner-sphere complexes on variable-charge ≡AlOH ...
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(2003)Arsenic(V), as the arsenate (AsO4)3- ion and its conjugate acids, is strongly sorbed to iron(III) oxides (α-Fe2O3), oxide hydroxides (α-,γ-FeOOH) and poorly crystalline ferrihydrite (hydrous ferric oxide). The mechanism ...
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(2005)The adsorption of Nd3+ onto rutile surfaces was examined by potentiometric titration from 25 to 250°C, in 0.03 and 0.30m NaCl background electrolyte. Experimental results show that Nd3+ sorbs strongly, even at low temperature, ...
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(1997)Pb(II) sorption on Al2O3 powders was studied as functions of sorption density (from 0.5 to 5.2 μmoles/m2) and [Pb]eq (0.03-1.4 mM) in 0.1 M NaNO3 electrolyte solution using XAFS spectroscopy. At pH 6 and 7, Pb(II) ions ...
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(1997)Pb(II) sorption on goethite and hematite powders was studied at room temperature as a function of pH (6-8), sorption density (2-10 μmoles/m2), and [Pb]eq (0.2 μM - 1.2 mM) in 0.1 M NaNO3 electrolyte using XAFS spectroscopy. ...
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(1998)Pb(II) sorption on goethite and γ-alumina was studied in aqueous 0.1 M NaCl solutions as a function of pH (5-7), sorption density (1.2-5 μmoles/m2), and [Pb]T (0.24-4.53 mM) using XAFS (X-ray absorption fine structure) ...
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(1998)Sulfate adsorbed to hematite surfaces from aqueous solution is examined using Fourier transform infrared (FTIR) spectroscopy and scanning tunneling microscopy (STM). FTIR was carried out using an Attenuated Total Reflectance ...
Now showing items 14065-14084 of 39375