Arsenic removal from natural groundwater using ‘green rust’: Solid phase stability and contaminant fate
نویسندگان
چکیده
Arsenic (As) contamination in groundwater remains a pressing global challenge. In this study, we evaluated the potential of green rust (GR), redox-active iron phase frequently occurring anoxic environments, to treat As at former wood preservation site. We performed long-term batch experiments by exposing synthetic GR sulfate (GRSO4) As-free and As-spiked (6 mg L?1) natural both 25 4 °C. At °C, GRSO4 was metastable transformed GRCO3, then fully magnetite within 120 days; however, stability increased 7-fold lowering temperature 8-fold adding Highest observed when added This stabilizing effect is explained solubility being lowered adsorbed and/or lower temperatures, inhibiting partial dissolution required for transformation ultimately magnetite. Despite these mineral transformations, all removed from samples days while uptake 2 times slower Overall, have successfully documented that an important substrate immobilization subsurface environments.
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ژورنال
عنوان ژورنال: Journal of Hazardous Materials
سال: 2021
ISSN: ['1873-3336', '0304-3894']
DOI: https://doi.org/10.1016/j.jhazmat.2020.123327