Investigation of sorption mechanism on arsenic co-precipitation with ferrihydrite for quantitative modelling of AMD treatment

Chiharu Tokoro, Daisuke Haraguchi, Sayaka Izawa

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Sorption mechanism of dilute As(V) co-precipitation with ferrihydrite was investigated for quantitative modelling toward an effective treatment of acid mine drainage (AMD). In this study, co-precipitation experiments were exactly distinguished from simple adsorption ones. Several kinds of experimental investigations were conducted for both experiments respectively; sorption characteristics observation, X-ray diffraction (XRD) analysis and X-ray Absorption Fine Structure (XAFS) analysis. We compared experimental results between co-precipitation experiments and simple adsorption ones. These results suggested that the sorption mechanism in co-precipitation process consists of not only simple two-dimensional adsorption onto the surface of ferrihydrite but also some three-dimensional uptake with ferrihydrite. We also evaluated the sorption mechanism by analysis of XRD and XANES. XRD or XANES spectra showed that surface precipitation of poorly crystalline ferric arsenate was formed when the initial As/Fe molar ratio was > 0.5, beyond the thermodynamic bulk precipitation range for ferric arsenate. From XANES analysis on As K edge, we also obtained the ratio of simple adsorption of As(V) to ferrihydrite and surface precipitation of ferric arsenate in co-precipitates quantitatively. We also attempted to obtain quantitative models for As(V) sorption in co-precipitation or simple adsorption with ferrihydrite. The surface complexation models could quantitatively represent experimental results in adsorption experiments. On the other hand, the surface precipitation models considering with poorly crystalline ferric arsenate formation was newly constructed for As(V) co-precipitation with ferrihydrite. As a result, calculations of the surface precipitation models were in good agreement with the experimental results of As(V) co-precipitation and surface precipitation models were capable to predict As(V) co-precipitation.

    Original languageEnglish
    Title of host publicationEuropean Metallurgical Conference, EMC 2013
    Pages329-342
    Number of pages14
    Publication statusPublished - 2013
    Event7th European Metallurgical Conference, EMC 2013 - Weimar
    Duration: 2013 Jun 232013 Jun 26

    Other

    Other7th European Metallurgical Conference, EMC 2013
    CityWeimar
    Period13/6/2313/6/26

    Fingerprint

    Arsenic
    Coprecipitation
    Drainage
    Sorption
    Acids
    Adsorption
    Experiments
    Crystalline materials
    X ray diffraction
    ferrihydrite
    X ray absorption
    Complexation
    X ray diffraction analysis
    Precipitates
    Thermodynamics
    arsenic acid

    Keywords

    • Acid mine drainage
    • Arsenic
    • Surface complexation model
    • Surface precipitation model
    • XAFS

    ASJC Scopus subject areas

    • Metals and Alloys

    Cite this

    Tokoro, C., Haraguchi, D., & Izawa, S. (2013). Investigation of sorption mechanism on arsenic co-precipitation with ferrihydrite for quantitative modelling of AMD treatment. In European Metallurgical Conference, EMC 2013 (pp. 329-342)

    Investigation of sorption mechanism on arsenic co-precipitation with ferrihydrite for quantitative modelling of AMD treatment. / Tokoro, Chiharu; Haraguchi, Daisuke; Izawa, Sayaka.

    European Metallurgical Conference, EMC 2013. 2013. p. 329-342.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Tokoro, C, Haraguchi, D & Izawa, S 2013, Investigation of sorption mechanism on arsenic co-precipitation with ferrihydrite for quantitative modelling of AMD treatment. in European Metallurgical Conference, EMC 2013. pp. 329-342, 7th European Metallurgical Conference, EMC 2013, Weimar, 13/6/23.
    Tokoro C, Haraguchi D, Izawa S. Investigation of sorption mechanism on arsenic co-precipitation with ferrihydrite for quantitative modelling of AMD treatment. In European Metallurgical Conference, EMC 2013. 2013. p. 329-342
    Tokoro, Chiharu ; Haraguchi, Daisuke ; Izawa, Sayaka. / Investigation of sorption mechanism on arsenic co-precipitation with ferrihydrite for quantitative modelling of AMD treatment. European Metallurgical Conference, EMC 2013. 2013. pp. 329-342
    @inproceedings{5da2533a69f843e686554d9a64420e8b,
    title = "Investigation of sorption mechanism on arsenic co-precipitation with ferrihydrite for quantitative modelling of AMD treatment",
    abstract = "Sorption mechanism of dilute As(V) co-precipitation with ferrihydrite was investigated for quantitative modelling toward an effective treatment of acid mine drainage (AMD). In this study, co-precipitation experiments were exactly distinguished from simple adsorption ones. Several kinds of experimental investigations were conducted for both experiments respectively; sorption characteristics observation, X-ray diffraction (XRD) analysis and X-ray Absorption Fine Structure (XAFS) analysis. We compared experimental results between co-precipitation experiments and simple adsorption ones. These results suggested that the sorption mechanism in co-precipitation process consists of not only simple two-dimensional adsorption onto the surface of ferrihydrite but also some three-dimensional uptake with ferrihydrite. We also evaluated the sorption mechanism by analysis of XRD and XANES. XRD or XANES spectra showed that surface precipitation of poorly crystalline ferric arsenate was formed when the initial As/Fe molar ratio was > 0.5, beyond the thermodynamic bulk precipitation range for ferric arsenate. From XANES analysis on As K edge, we also obtained the ratio of simple adsorption of As(V) to ferrihydrite and surface precipitation of ferric arsenate in co-precipitates quantitatively. We also attempted to obtain quantitative models for As(V) sorption in co-precipitation or simple adsorption with ferrihydrite. The surface complexation models could quantitatively represent experimental results in adsorption experiments. On the other hand, the surface precipitation models considering with poorly crystalline ferric arsenate formation was newly constructed for As(V) co-precipitation with ferrihydrite. As a result, calculations of the surface precipitation models were in good agreement with the experimental results of As(V) co-precipitation and surface precipitation models were capable to predict As(V) co-precipitation.",
    keywords = "Acid mine drainage, Arsenic, Surface complexation model, Surface precipitation model, XAFS",
    author = "Chiharu Tokoro and Daisuke Haraguchi and Sayaka Izawa",
    year = "2013",
    language = "English",
    pages = "329--342",
    booktitle = "European Metallurgical Conference, EMC 2013",

    }

    TY - GEN

    T1 - Investigation of sorption mechanism on arsenic co-precipitation with ferrihydrite for quantitative modelling of AMD treatment

    AU - Tokoro, Chiharu

    AU - Haraguchi, Daisuke

    AU - Izawa, Sayaka

    PY - 2013

    Y1 - 2013

    N2 - Sorption mechanism of dilute As(V) co-precipitation with ferrihydrite was investigated for quantitative modelling toward an effective treatment of acid mine drainage (AMD). In this study, co-precipitation experiments were exactly distinguished from simple adsorption ones. Several kinds of experimental investigations were conducted for both experiments respectively; sorption characteristics observation, X-ray diffraction (XRD) analysis and X-ray Absorption Fine Structure (XAFS) analysis. We compared experimental results between co-precipitation experiments and simple adsorption ones. These results suggested that the sorption mechanism in co-precipitation process consists of not only simple two-dimensional adsorption onto the surface of ferrihydrite but also some three-dimensional uptake with ferrihydrite. We also evaluated the sorption mechanism by analysis of XRD and XANES. XRD or XANES spectra showed that surface precipitation of poorly crystalline ferric arsenate was formed when the initial As/Fe molar ratio was > 0.5, beyond the thermodynamic bulk precipitation range for ferric arsenate. From XANES analysis on As K edge, we also obtained the ratio of simple adsorption of As(V) to ferrihydrite and surface precipitation of ferric arsenate in co-precipitates quantitatively. We also attempted to obtain quantitative models for As(V) sorption in co-precipitation or simple adsorption with ferrihydrite. The surface complexation models could quantitatively represent experimental results in adsorption experiments. On the other hand, the surface precipitation models considering with poorly crystalline ferric arsenate formation was newly constructed for As(V) co-precipitation with ferrihydrite. As a result, calculations of the surface precipitation models were in good agreement with the experimental results of As(V) co-precipitation and surface precipitation models were capable to predict As(V) co-precipitation.

    AB - Sorption mechanism of dilute As(V) co-precipitation with ferrihydrite was investigated for quantitative modelling toward an effective treatment of acid mine drainage (AMD). In this study, co-precipitation experiments were exactly distinguished from simple adsorption ones. Several kinds of experimental investigations were conducted for both experiments respectively; sorption characteristics observation, X-ray diffraction (XRD) analysis and X-ray Absorption Fine Structure (XAFS) analysis. We compared experimental results between co-precipitation experiments and simple adsorption ones. These results suggested that the sorption mechanism in co-precipitation process consists of not only simple two-dimensional adsorption onto the surface of ferrihydrite but also some three-dimensional uptake with ferrihydrite. We also evaluated the sorption mechanism by analysis of XRD and XANES. XRD or XANES spectra showed that surface precipitation of poorly crystalline ferric arsenate was formed when the initial As/Fe molar ratio was > 0.5, beyond the thermodynamic bulk precipitation range for ferric arsenate. From XANES analysis on As K edge, we also obtained the ratio of simple adsorption of As(V) to ferrihydrite and surface precipitation of ferric arsenate in co-precipitates quantitatively. We also attempted to obtain quantitative models for As(V) sorption in co-precipitation or simple adsorption with ferrihydrite. The surface complexation models could quantitatively represent experimental results in adsorption experiments. On the other hand, the surface precipitation models considering with poorly crystalline ferric arsenate formation was newly constructed for As(V) co-precipitation with ferrihydrite. As a result, calculations of the surface precipitation models were in good agreement with the experimental results of As(V) co-precipitation and surface precipitation models were capable to predict As(V) co-precipitation.

    KW - Acid mine drainage

    KW - Arsenic

    KW - Surface complexation model

    KW - Surface precipitation model

    KW - XAFS

    UR - http://www.scopus.com/inward/record.url?scp=84884924616&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84884924616&partnerID=8YFLogxK

    M3 - Conference contribution

    AN - SCOPUS:84884924616

    SP - 329

    EP - 342

    BT - European Metallurgical Conference, EMC 2013

    ER -