搜索结果: 1-15 共查到“地质学 Oxidation”相关记录38条 . 查询时间(0.015 秒)
Oxidation State of Iron in Glauconite from Oxidized and Reduced Zones of Soil-Geologic Columns
Glauconite Iron Mossbauer spectroscopy Oxidized zone Pyrite Reduced zone Soil
2011/11/30
Abstract: Glauconite from the oxidized and reduced zones of soil-geologic columns at two Coastal Plain sites, one in Maryland and one in New Jersey, was examined by M鰏sbauer spectroscopy. The data ind...
Synthesis, Characterization and Performance of Ce0.8La0.2O1.9-ATP Composite Catalyst for Phenol Catalytic Oxidation
Catalytic Activity Ce0.8La0.2O1.9-ATP Co-Precipitation Nano Composite
2011/11/22
Ce0.8La0.2O1.9-attapulgite (Ce0.8La0.2O1.9-ATP) nanocomposite materials were synthesized by co-precipitation method. The microstructure and phase composition of the as-prepared samples were characteri...
Mechanisms and Crystal Chemistry of Oxidation in Annite: Resolving the Hydrogen-Loss and Vacancy Reactions
Annite Biotite Crystal Chemistry Differential Thermal Analysis Ferrioxyannite Gas Chromatography Mossbauer Spectroscopy
2011/12/5
Abstract: A synthetic octahedral-site-vacancy-free annite sample and its progressive oxidation, induced by heating in air, were studied by powder X-ray diffraction (pXRD), Mössbauer spectroscopy,...
Effects of Iron Oxidation State and Organic Cations on Dioctahedral Smectite Hydration
Alkylammonium Ferric Iron Ferrous Iron HDTMA Hydrophilic Surface Hydrophobic Surface Interlayer Cation Oxidation Reduction Surface Hydration Swelling TMA TMPA
2011/12/6
Abstract: Reduction of structural Fe in Na-exchanged dioctahedral smectites decreases swellability in water, but because clay interlayers also collapse in the process the concomitant effect on surface...
The interaction of pyrite {100} surfaces with O2 and H2O: Fundamental oxidation mechanisms
The interaction pyrite {100} surfaces with O2 H2O:Fundamental oxidation mechanisms
2012/4/1
The interaction of gaseous O , H O, and their mixtures with clean {100} surfaces of pyrite
2 2) were investigated in ultra-high vacuum using scanning tunneling microscopy and spectros-(FeS
copy (STM...
Spectroscopy Study of Arsenite [As(III)] Oxidation on Mn-Substituted Goethite
Arsenate Arsenite Mn-Substituted Goethite Oxidation XANES
2011/12/7
Abstract: Mn-substituted goethite was synthesized and the interaction between arsenite (As(III)) and Mn-substituted goethite was investigated by both solution chemistry and X-ray adsorption near edge ...
Oxidation state of gold and arsenic in gold-bearing arsenian pyrite
Oxidation state gold gold-bearing arsenian pyrite
2012/3/31
XANES measurements on gold-bearing arsenian pyrite from the Twin Creeks Carlin-type gold
and Au and arsenic is present at As . Au is attributed
deposits show that gold is present as both Au
to su...
Microbial oxidation of pyrite: Experiments using microorganisms from an extreme acidic environment
Microbial oxidation microorganisms acidic environment
2012/4/1
Surface colonization and microbial dissolution of pyrite were studied in the laboratory and by in situ surface colonization experiments conducted at Iron Mountain, California.Laboratory experiments in...
Structural mechanism of CO2+ oxidation by the phyllomanganate buserite
Structural mechanism CO2+ oxidationp hyllomanganate buserite
2012/4/6
ThegeochemistryofCoattheEarthflssurfaceiscloselyassociatedwiththatofmanganeseoxides.ThisgeochemicalassociationresultsfromtheoxidationofhighlysolubleCotoweaklysolubleCo species,coupledwiththereductiono...
Transformation of titanomagnetite to titanomaghemite; A slow, two-step oxidation-ordering process in MORB
Transformation titanomaghemite A slow two-step oxidation-ordering process MORB
2012/4/6
Theyoungestsamplehasparameterscorrespondingtonearlyunoxidizedtitanomagne-
tite,whereastheoldestisnear-end-membertitanomaghemite.Intermediatesamplesare
partiallyalteredbutdisplaynosuperstructurere?ec...
Marcasite oxidation in low-temperature acidic (pH 3.0) solutions: Mechanism and rate laws
Marcasite oxidation low-temperature acidic :Mechanism rate laws
2012/4/6
MarcasitesurfaceswereanalyzedusingX-rayphotoelectronspectroscopy(XPS)andaugerelectronspectroscop(AES).XPSdataofapristinemarcasitesurfaceareusedasatemplatetoexaminethecharacteristicsofamarcasitesurface...
Conversion of Ferruginous Allophanes to Ferruginous Beidellites at 95 癈 Under Alkaline Conditions with Alternating Oxidation and Reduction
Allophane Beidellite Infrared Spectra Nontronite Vertisols X-ray Diffraction (XRD)
2011/12/22
Abstract: Ferruginous beidellites with Al:Fe atomic ratios up to 2.36 were obtained when solutions containing Al, Fe2+ and H4SiO4 were adjusted to pH 8.5 with Ca(OH)2 and incubated at 95 癈 in the pres...
Surface structural controls on pyrite oxidation kinetics: An XPS-UPS, STM, and modeling study
controls pyrite oxidation kinetics XPS-UPS STM modeling study
2012/4/6
X-ray and ultraviolet photoelectron spectroscopy (XPS and UPS,respectively) and scan-ning tunneling microscopy (STM) were used to observe the initial oxidation of pyrite surfaces in air. The results s...
Acidified Oxalate and Dithionite Solubility and Color of Synthetic, Partially Oxidized Al-Magnetites and their Thermal Oxidation Products
Aluminum substitution Electron microscopy Hematite Maghemite Magnetite Oxidation Solubility
2011/12/1
Abstract: Submicron-sized (∼3–60 nm) powders of Al-substituted magnetite were synthesized in the laboratory by precipitation methods by mixing appropriate molar volumes FeCl2, FeCl3 and AlCl3 so...
Oxidation of Phenol in Acidic Aqueous Suspensions of Manganese Oxides
Buserite Feitknechtite Manganese oxide Manganite Oxidation Phenol Quinones Reduction potential
2011/12/30
Phenol (benzenol) oxidation by three synthetic manganese oxides (buserite, manganite, and feitknechtite) has been studied in aerated, aqueous, acidified suspensions. The rate of reaction was pH depend...