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Publisher: Elsevier BV
Journal: Journal of Environmental Chemical Engineering
Languages: English
Types: Article
Subjects: Phase transition pathways, Anionic effects on corrosion, QD, Groundwater, Iron nanoparticles, Cu and Zn sorption behaviour
This work has investigated the influence of common groundwater anions (Cl-, NO3-, SO42- and HCO3-) on the corrosion behaviour and associated removal of copper (Cu) and zinc (Zn) ions onto nanoscale zero-valent iron particles (nZVI). After 16 week exposure to solutions containing each anion at 10 mM concentrations, nZVI was observed to corrode into different iron (hydr)oxide phases (determined using XRD), depending upon the anion present: HNO3- produced goethite particles; NO3- produced predominantly magnetite/maghemite particles; both SO42- and Cl- produced a mixture of phases, including magnetite/maghemite, lepidocrocite and goethite. For solutions containing the different anions and 0.3 mM concentrations of Cu or Zn, near-total metal removal onto nZVI was recorded in the initial stages of the reaction (e.g. <24 hrs) for all systems tested. However, when Cl- and SO42- were also present significant subsequent desorption was recorded and attributed to the influence of anionic pitting corrosion. In contrast, no Cu or Zn desorption was recorded for batch systems containing NO3-, which was attributed to the enmeshment of Cu or Zn in a mixed-valent iron oxide shell. Results herein therefore demonstrate that NO3- could be utilised alongside nZVI to improve its long-term performance for in situ water treatment applications.
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