Zero-Valent Iron Nanoparticles Reduce Arsenites and Arsenates to As(0) Firmly Embedded in CoreShell Superstructure: Challenging Strategy of Arsenic Treatment under Anoxic Conditions Academic Article uri icon

abstract

  • 2017 American Chemical Society. Arsenites and arsenates are carcinogenic to humans and are typically removed from contaminated water using various sorbents. However, these treatment methods result in the secondary release of weakly bound As species and require large amounts of sorbents. Here, we introduce a groundbreaking method involving the use of oxidic-shell-free nanoscale zero-valent iron (OSF-nZVI) to treat arsenite/arsenate-polluted underground water. Under anoxic conditions, OSF-nZVI is capable to reduce As(III)/As(V) species to As(0) (up to 65% of total arsenic content). Thus, reduction synergistically contributes to sorption tuning suitably the chemical nature and isoelectric points of As species, thereby enhancing arsenic removal from an anoxic aqueous environment. More importantly, As species are locked between the Fe(0) core and iron(III) oxide outer shell. For comparison, the removal capability of OSF-nZVI is 2 times lower under oxic conditions, due to the complex redox mechanism resulting in exclusive sorption of As(III)/As(V) species onto the surface of oxidized OSF-nZVI particles. The unique strategy to treat arsenites/arsenates by their reduction to zero-valent arsenic with OSF-nZVI was also demonstrated in experiments with real polluted water. Results suggest that green reduction and firm immobilization of toxic As species through OSF-nZVI could provide environmentally friendly tool to treat arsenic-polluted underground water, a main source of highly contaminated drinking water worldwide.

published proceedings

  • ACS Sustainable Chemistry & Engineering

altmetric score

  • 13.16

author list (cited authors)

  • Tuek, J., Prucek, R., Kolak, J., Zoppellaro, G., Petr, M., Filip, J., Sharma, V. K., & Zboil, R.

citation count

  • 64

complete list of authors

  • Tuček, Jiří||Prucek, Robert||Kolařík, Jan||Zoppellaro, Giorgio||Petr, Martin||Filip, Jan||Sharma, Virender K||Zbořil, Radek

publication date

  • April 2017