TY - GEN
T1 - Interaction of arsenic with co-precipitated Fe(II,III) (hydr)oxides
AU - van Genuchten, C. M.
AU - Behrends, T.
AU - Kraal, P.
AU - Stipp, S. L.S.
AU - Dideriksen, K.
N1 - Funding Information:
We acknowledge Dipanjan Banerjee (ESRF) and Ryan Davis (SSRL) for assistance during XAS data collection. CMvG acknowledges funding support by a NWO Veni grant (Project No. 14400).
Funding Information:
The authors would like to thank CAPES, CNPq, FAPEMIG and INCT Acqua.
Publisher Copyright:
© 2018, CRC Press/Balkema. All rights reserved.
PY - 2018
Y1 - 2018
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85079242029&partnerID=8YFLogxK
U2 - 10.1201/9781351046633-155
DO - 10.1201/9781351046633-155
M3 - Conference article in proceedings
AN - SCOPUS:85079242029
SN - 9781138486096
T3 - Environmental Arsenic in a ChangingWorld - 7th International Congress and Exhibition Arsenic in the Environment, 2018
SP - 401
EP - 402
BT - Environmental Arsenic in a ChangingWorld - 7th International Congress and Exhibition Arsenic in the Environment, 2018
A2 - Zhu, Yong-Guan
A2 - Zhu, Yong-Guan
A2 - Guo, Huaming
A2 - Guo, Huaming
A2 - Bhattacharya, Prosun
A2 - Bhattacharya, Prosun
A2 - Bundschuh, Jochen
A2 - Ahmad, Arslan
A2 - Ahmad, Arslan
A2 - Ahmad, Arslan
A2 - Naidu, Ravi
A2 - Naidu, Ravi
PB - CRC Press/Balkema
T2 - 7th International Congress and Exhibition Arsenic in the Environment, 2018
Y2 - 1 July 2018 through 6 July 2018
ER -