Article
Licensed
Unlicensed
Requires Authentication
Arsenate sorption on schwertmannite
-
Keisuke Fukushi
,
Nobuyuki Yanase
Published/Copyright:
March 28, 2015
Abstract
The sorption mechanism of arsenate [As(V)] on schwertmannite was investigated by means of batch sorption experiments as a function of As(V) concentration in acidic solution at 25 °C. Structural simulation indicated that the surface sites of schwertmannite comprised various O atom (or hydroxyl) and SO4 groups. Sorption experiments showed that the reactive sites for As(V) sorption are surfacecoordinated SO4 groups rather than surface hydroxyl groups, as reported in earlier studies. The As(V) sorption mechanism involves ligand exchange with surface-adsorbed and structural SO4. The results of the sorption experiments also suggested monodentate As(V) coordination at the surface-adsorbed SO4 sites [(Fe1)2SO4] and bidentate As(V) coordination at the structural SO4 sites [(Fe3)2SO4]. The overall ligand-exchange reaction was
0.61 (Fe1)2SO4 + 0.39 (Fe3)2SO4 + 1.61 H2AsO4- → 1.22 Fe1H2AsO4 + 0.39 (Fe3)2HAsO4 + 0.39 H+ + SO42-
where the 1 and 3 in Fe1 and Fe3 are coordination numbers. The equilibrium constant derived for the exchange reaction, log KEX = 4.96, describes the observed As(V) sorption behavior. Nanocrystalline materials like schwertmannite are widespread in nature and typically contain significant amounts of anionic impurities, such as sulfate and silicate. Our results indicate that the effects of impurities can be significant and should be considered in order to gain a realistic understanding of sorption processes in natural systems.
Received: 2003-8-3
Accepted: 2004-4-7
Published Online: 2015-3-28
Published in Print: 2004-11-1
© 2015 by Walter de Gruyter Berlin/Boston
You are currently not able to access this content.
You are currently not able to access this content.
Articles in the same Issue
- First-principle study of polytype structures of 1:1 dioctahedral phyllosilicates
- Calorimetry of liquids in the system Na2O-Fe2O3-SiO2
- A Mössbauer study of the oxidation state of Fe in silicate melts
- Nanometer-scale measurements of Fe3+/ΣFe by electron energy-loss spectroscopy: A cautionary note
- The most reduced rock from the moon, Apollo 14 basalt 14053: Its unique features and their origin
- Quantitative analysis of ammonium in biotite using infrared spectroscopy
- Lizardite-chlorite structural relationships and an inferred high-pressure lizardite polytype
- V oxidation state and coordination number in silicate glasses by XAS
- Structure of the fluorapatite (100)-water interface by high-resolution X-ray reflectivity
- Origin of diffuse superstructure reflections in labuntsovite-group minerals
- Isosymmetric structural phase transition of orthoenstatite: Molecular dynamics simulation
- Crystal nucleation in hydrous rhyolite: Experimental data applied to classical theory
- Investigation of polytypes in lepidolite using electron back-scattered diffraction
- Iron partitioning between basaltic melts and clinopyroxene as a function of oxygen fugacity
- The synthesis of zeolite-P, Linde Type A, and hydroxysodalite zeolites from paper sludge ash at low temperature (80 °C): Optimal ash-leaching condition for zeolite synthesis
- High-pressure viscometry of polymerized silicate melts and limitations of the Eyring equation
- Biological control on calcite crystallization: AFM investigation of coccolith polysaccharide function
- Order parameter variation through the C2/m-P21/m phase transition in cummingtonite
- Arsenate sorption on schwertmannite
- Evidence on the structure of synthetic schwertmannite
- Crystal-chemical characterization of tourmalines from the English Lake District: Electron-microprobe analyses and Mössbauer spectroscopy
- Crystal chemistry and paragenesis of compositionally unique (Al-, Fe-, Nb-, and Zr-rich) titanite from Afrikanda, Russia
- Site distribution of Fe2+and Fe3+in the axinite mineral group: New crystal-chemical formula
- Epidote-rich talc-kyanite-phengite eclogites, Sulu terrane, eastern China: P-T-fO₂estimates and the significance of the epidote-talc assemblage in eclogite
- Quantitative mineralogy of the Yukon River system: Changes with reach and season, and determining sediment provenance
- Exsolution of thortveitite, yttrialite, and xenotime during low-temperature recrystallization of zircon from New Caledonia, and their significance for trace element incorporation in zircon
- Mineralogical characterization and genesis of hydrothermal Mn oxides from the flank of the Juan the Fuca Ridge
- Synchrotron X-ray diffraction study of the structure of shafranovskite, K2Na3(Mn,Fe,Na)4[Si9(O,OH)27](OH)2⋅nH2O, a rare manganese phyllosilicate from the Kola peninsula, Russia
- Letter. Coupled cation and oxygen-isotope exchange between alkali feldspar and aqueous chloride solution
Articles in the same Issue
- First-principle study of polytype structures of 1:1 dioctahedral phyllosilicates
- Calorimetry of liquids in the system Na2O-Fe2O3-SiO2
- A Mössbauer study of the oxidation state of Fe in silicate melts
- Nanometer-scale measurements of Fe3+/ΣFe by electron energy-loss spectroscopy: A cautionary note
- The most reduced rock from the moon, Apollo 14 basalt 14053: Its unique features and their origin
- Quantitative analysis of ammonium in biotite using infrared spectroscopy
- Lizardite-chlorite structural relationships and an inferred high-pressure lizardite polytype
- V oxidation state and coordination number in silicate glasses by XAS
- Structure of the fluorapatite (100)-water interface by high-resolution X-ray reflectivity
- Origin of diffuse superstructure reflections in labuntsovite-group minerals
- Isosymmetric structural phase transition of orthoenstatite: Molecular dynamics simulation
- Crystal nucleation in hydrous rhyolite: Experimental data applied to classical theory
- Investigation of polytypes in lepidolite using electron back-scattered diffraction
- Iron partitioning between basaltic melts and clinopyroxene as a function of oxygen fugacity
- The synthesis of zeolite-P, Linde Type A, and hydroxysodalite zeolites from paper sludge ash at low temperature (80 °C): Optimal ash-leaching condition for zeolite synthesis
- High-pressure viscometry of polymerized silicate melts and limitations of the Eyring equation
- Biological control on calcite crystallization: AFM investigation of coccolith polysaccharide function
- Order parameter variation through the C2/m-P21/m phase transition in cummingtonite
- Arsenate sorption on schwertmannite
- Evidence on the structure of synthetic schwertmannite
- Crystal-chemical characterization of tourmalines from the English Lake District: Electron-microprobe analyses and Mössbauer spectroscopy
- Crystal chemistry and paragenesis of compositionally unique (Al-, Fe-, Nb-, and Zr-rich) titanite from Afrikanda, Russia
- Site distribution of Fe2+and Fe3+in the axinite mineral group: New crystal-chemical formula
- Epidote-rich talc-kyanite-phengite eclogites, Sulu terrane, eastern China: P-T-fO₂estimates and the significance of the epidote-talc assemblage in eclogite
- Quantitative mineralogy of the Yukon River system: Changes with reach and season, and determining sediment provenance
- Exsolution of thortveitite, yttrialite, and xenotime during low-temperature recrystallization of zircon from New Caledonia, and their significance for trace element incorporation in zircon
- Mineralogical characterization and genesis of hydrothermal Mn oxides from the flank of the Juan the Fuca Ridge
- Synchrotron X-ray diffraction study of the structure of shafranovskite, K2Na3(Mn,Fe,Na)4[Si9(O,OH)27](OH)2⋅nH2O, a rare manganese phyllosilicate from the Kola peninsula, Russia
- Letter. Coupled cation and oxygen-isotope exchange between alkali feldspar and aqueous chloride solution
