Search Results - "Parks, G.A."

Surface complexation of Pb(II) at oxide-water interfaces: II. XAFS and bond-valence determination of mononuclear Pb(II) sorption products and surface functional groups on iron oxides by Bargar, J.R., Brown, G.E., Parks, G.A.

“…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/m 2), and [Pb] eq…”
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Surface Complexation of Pb(II) at Oxide-Water Interfaces: III. XAFS Determination of Pb(II) and Pb(II)-Chloro Adsorption Complexes on Goethite and Alumina by Bargar, J.R, Brown, G.E, Parks, G.A

“…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/m 2), and [Pb]…”
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Formation and Release of Cobalt(II) Sorption and Precipitation Products in Aging Kaolinite–Water Slurries by Thompson, Hillary A., Parks, George A., Brown, Gordon E.

“…The uptake and release behavior of cobalt(II) was studied over thousands of hours in CO2-free aqueous suspensions of kaolinite under three pairs of total…”
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Surface complexation of Pb(II) at oxide-water interfaces: I. XAFS and bond-valence determination of mononuclear and polynuclear Pb(II) sorption products on aluminum oxides by Bargar, J.R., Brown, G.E., Parks, G.A.

“…Pb(II) sorption on Al 2O 3 powders was studied as functions of sorption density (from 0.5 to 5.2 μmoles/m 2) and [Pb] eq (0.03–1.4 mM) in 0.1 M NaNO 3…”
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Quantitative Speciation of Lead in Selected Mine Tailings from Leadville, CO by Ostergren, John D, Brown, Gordon E, Parks, George A, Tingle, Tracy N

“…We have characterized Pb speciation in selected tailings from the Leadville, CO, area using a variety of analytical techniques, including X-ray absorption fine…”
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Differential redox and sorption of Cr (III/VI) on natural silicate and oxide minerals: EXAFS and XANES results by Peterson, Maria L., Brown, Gordon E., Parks, George A., Stein, Carol L.

“…Synchrotron-based X-ray absorption fine structure (XAFS) spectroscopy was used to investigate the reduction of aqueous Cr(VI) to Cr(III) in magnetite-bearing…”
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Dynamic interactions of dissolution, surface adsorption, and precipitation in an aging cobalt(II)-clay-water system by Thompson, Hillary A., Parks, George A., Brown, Gordon E.

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XAFS and Bond-Valence Determination of the Structures and Compositions of Surface Functional Groups and Pb(II) and Co(II) Sorption Products on Single-Crystal α-Al2O3 by Bargar, J.R., Towle, S.N., Brown, G.E., Parks, G.A.

“…The structures and compositions of Pb(II) adsorption complexes and surface binding sites on α-Al2O3(0001) and (1&1macr;02) surfaces were investigated in the…”
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X-ray Absorption Fine-Structure Spectroscopy Study of Photocatalyzed, Heterogeneous As(III) Oxidation on Kaolin and Anatase by Foster, A. L, Brown, G. E, Parks, G. A

“…We have used X-ray absorption fine-structure spectroscopy (XAFS) to investigate As(III) adsorption on bulk Georgia kaolin (KGa-1b), Wyoming smectite (SWy-2),…”
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X-ray absorption spectroscopy of Co(II) sorption complexes on quartz (α-SiO 2) and rutile (TiO 2) by O'Day, Peggy A., Chisholm-Brause, Catherine J., Towle, Steven N., Parks, George A., Brown, Gordon E.

“…The local molecular structure of Co(II) surface complexes sorbed to two pure mineral substrates, quartz (α-SiO 2) and rutile (TiO 2), was examined with X-ray…”
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Sorption of Co(II) on metal oxide surfaces. 1. Identification of specific binding sites of Co(II) on (110) and (001) surfaces of TiO{sub 2} (rutile) by grazing-incidence XAFS spectroscopy by Towle, S.N., Brown, G.E. Jr, Parks, G.A.

“…The authors have examined the molecular-scale details of aqueous Co(II) surface complexes and the types of surface sites to which these complexes bind on the…”
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Inorganic ligand effects on Pb(II) sorption to goethite ({alpha}-FeOOH). 2. Sulfate by Ostergren, J.D., Brown, G.E. Jr, Parks, G.A., Persson, P.

“…The effects of sulfate anions on the uptake of Pb(II) onto goethite were investigated at the molecular level using in situ PbL{sub III}-EXAFS and ATR-FTIR…”
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Structure and bonding of Cu(II)-glutamate complexes at the {gamma}-Al{sub 2}O{sub 3}-water interface by Fitts, J.P., Persson, P., Brown, G.E. Jr, Parks, G.A.

“…The composition and mode of attachment of Cu(II) complexes at the {gamma}-Al{sub 2}O{sub 3}-water interface in suspensions containing a simple amino acid…”
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Sorption of Co(II) on metal oxide surfaces. 2. identification of Co(II)(aq) adsorption sites on the (0001) and (1{bar 1}02) surfaces of {alpha}-Al{sub 2}O{sub 3} by grazing-incidence XAFS spectroscopy by Towle, S.N., Bargar, J.R., Brown, G.E. Jr, Parks, G.A.

“…The authors have characterized the adsorption of Co(II) on the (0001) and (1{bar 1}02) surfaces of {alpha}-Al{sub 2}O{sub 3} single crystals under ambient…”
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Inorganic ligand effects on Pb(II) sorption to goethite ({alpha}-FeOOH). 1. Carbonate by Ostergren, J.D., Trainor, T.P., Bargar, J.R., Brown, G.E. Jr, Parks, G.A.

“…Macroscopic measurements show that Pb(II) uptake on iron(hydr)oxides can be altered significantly by dissolved carbonate (enhanced up to 18% at pH 5 and…”
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Structure and composition of copper(II)-2-2{prime}-bipyridine sorption complexes on amorphous SiO{sub 2} by Cheah, S.F., Brown, G.E. Jr, Parks, G.A.

“…The authors have used solution uptake studies, X-ray absorption fine structure (XAFS) spectroscopy, and electron paramagnetic resonance (EPR) spectroscopy to…”
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EXAFS spectroscopic study of neptunium(V) sorption at the α-FeOOH/water interface by COMBES, J.-M, CHISHOLM-BRAUSE, C. J, BROWN, G. E, PARKS, G. A, CONRADSON, S. D, ELLER, P. G, TRIAY, I. R, HOBART, D. E, MEIJER, A

“…The toxicity, potential mobility, and half-life of neptunium-237 made it one of the most important radionuclides to be stored in high-level radioactive waste…”
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X-ray Absorption Spectroscopic Studies of Cadmium and Selenite Adsorption on Aluminum Oxides by Papelis, Charalambos, Brown, Gordon E, Parks, George A, Leckie, James O

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XAFS study of Pb (II) sorption at the α-Al 2O 3-water interface by Bargar, J.R., Brown, G.E., Parks, G.A.

“…XAFS spectra of Pb(II) adsorbed at the α-Al 2O 3-water interface were collected over a range of pH, total Pb concentration, and sorption density (Γ) in 0.1 M…”
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XAFS study of Co(II) sorption at the α-Al 2O 3-water interface by Towle, S.N., Bargar, J.A., Persson, P., Brown, G.E., Parks, G.A.

“…Aqueous Co(II) sorption onto α-Al 2O 3 at pH 8.1 and surface concentrations (Γ) of 0.16 to 11.3 μ mol m −2 has been studied by XAFS spectroscopy. At low Γ, Co…”
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