at Google ScholarTitle data
Formentini, Thiago Augusto ; Cornelis, Geert ; Gustafsson, Jon Petter ; Leicht, Kathrin ; Tiberg, Charlotta ; Planer-Friedrich, Britta ; Durant, Neal ; Fan, Dimin ; Kleja, Dan B.:
Immobilizing arsenic in contaminated anoxic aquifer sediment using sulfidated and uncoated zero-valent iron (ZVI).
In: Journal of Hazardous Materials.
Vol. 462
(2024)
.
- 132743.
ISSN 0304-3894
DOI: https://doi.org/10.1016/j.jhazmat.2023.132743
Abstract in another language
Arsenic (As) is carcinogenic and of major concern in groundwater. We collected sediment material from a contaminated anoxic aquifer in Sweden and investigated the immobilization of As by four commercial zero-valent iron (ZVI) particles. Solid-phase As and Fe speciation was assessed using X-ray absorption spectroscopy (XAS) and solution-phase As speciation using chromatographic separation. Without ZVI addition, arsenite dominated in solution and As(V) species in the solid phase. Adding ZVI caused a sharp increase in solution pH (9.3–9.8), favoring As oxidation despite a lowered redox potential. ZVI greatly improved As retention by complex binding of arsenate to the Fe(III) (hydr)oxides formed by ZVI corrosion. Uncoated ZVI, both in nano- and microscale, performed better than their sulfidated counterparts, partly due to occlusion of As by the Fe(III) (hydr)oxides formed. The effect of particle size (micro vs. nano ZVI) on As immobilization was small, likely because immobilization was related to the corrosion products formed, rather than the initial size of the particles. Our results provide a strong geochemical background for the application of ZVI particles to remove As in contaminated aquifers under anoxic conditions and illustrate that immobilization mechanisms can differ between ZVI in As spiked solutions and sediment suspensions.
Further data
| Item Type: | Article in a journal |
|---|---|
| Refereed: | Yes |
| Institutions of the University: | Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professor Environmental Geochemistry Group Profile Fields > Advanced Fields > Ecology and the Environmental Sciences Research Institutions > Central research institutes > Bayreuth Center of Ecology and Environmental Research- BayCEER |
| Result of work at the UBT: | No |
| DDC Subjects: | 500 Science > 550 Earth sciences, geology |
| Date Deposited: | 16 Oct 2023 10:34 |
| Last Modified: | 16 Oct 2023 10:34 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/87171 |