Interaction of arsenic with co-precipitated Fe(II,III) (hydr)oxides

C. M. van Genuchten, T. Behrends, P. Kraal, S. L.S. Stipp, K. Dideriksen

Publikation: Bidrag til bog/rapport/konferenceproceedingsKonferenceartikel i proceedingspeer review

Abstrakt

Iron electrocoagulation (EC) is a low-cost arsenic (As) treatment method that is able to produce Fe(II,III) phases that bind As effectively, such as green rust (GR) and magnetite (Mag). We compared the As removal performance of coprecipitated GR, Mag and lepidocrocite (Lp) produced by Fe(0) EC. The As(III) removal efficiency for these phases was >60%, increasing in order of GR < Mag ≤ Lp, and all three Fe phases removed >95% of the initial As(V) (0.5 to 11 mg L−1). Spectroscopic data of EC samples revealed that As was able to substitute for tetrahedral Fe sites in Mag, associating with multiple Fe atoms, while As formed binuclear corner sharing geometries on GR and Lp surfaces. The formation of multinuclear As complexes during Mag production by Fe(0) EC can explain the low fraction of As remobilized from the solids during extractions with 2.5 mM PO3− 4 or 0.01 M NaOH. Taken together, our results show that Mag is the optimum phase for As removal in Fe(0) EC field treatment.

OriginalsprogEngelsk
TitelEnvironmental Arsenic in a ChangingWorld - 7th International Congress and Exhibition Arsenic in the Environment, 2018
RedaktørerYong-Guan Zhu, Yong-Guan Zhu, Huaming Guo, Huaming Guo, Prosun Bhattacharya, Prosun Bhattacharya, Jochen Bundschuh, Arslan Ahmad, Arslan Ahmad, Arslan Ahmad, Ravi Naidu, Ravi Naidu
ForlagCRC Press/Balkema
Sider401-402
Antal sider2
ISBN (Trykt)9781138486096
DOI
StatusUdgivet - 2018
Begivenhed7th International Congress and Exhibition Arsenic in the Environment, 2018 - Beijing, Kina
Varighed: 1 jul. 20186 jul. 2018

Publikationsserier

NavnEnvironmental Arsenic in a ChangingWorld - 7th International Congress and Exhibition Arsenic in the Environment, 2018

Konference

Konference7th International Congress and Exhibition Arsenic in the Environment, 2018
Land/OmrådeKina
ByBeijing
Periode1/07/186/07/18

Programområde

  • Programområde 2: Vandressourcer

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