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

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingspeer-review


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.

Original languageEnglish
Title of host publicationEnvironmental Arsenic in a Changing World
Subtitle of host publicationProceedings of the 7th International Congress and Exhibition on Arsenic in the Environment (AS 2018)
EditorsYongguan Zhu, Huaming Guo, Prosun Bhattacharya, Arslan Ahmad, Jochen Bundschuh, Ravi Naidu
PublisherCRC Press
Number of pages2
ISBN (Print)978-1-138-48609-6
Publication statusPublished - 2018
Externally publishedYes
Event7th International Congress and Exhibition Arsenic in the Environment, 2018 - Beijing, China
Duration: 1 Jul 20186 Jul 2018
Conference number: 7


Conference7th International Congress and Exhibition Arsenic in the Environment, 2018
Abbreviated titleAS 2018

Programme Area

  • Programme Area 2: Water Resources


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