A hybrid sorbent utilizing nanoparticles of hydrous iron oxide for arsenic removal from drinking water

P. Sylvester, Paul Westerhoff, T. Möller, M. Badruzzaman, O. Boyd

Research output: Contribution to journalArticle

95 Scopus citations

Abstract

Arsenic in drinking water, present primarily as inorganic As(III) (arsenite) or As(V) (arsenate), has been linked to a number of human ailments. This has prompted the United States Environmental Protection Agency (U.S. EPA) to lower the maximum contaminant level for arsenic in drinking water from 50 to 10 μg/L. ArsenXnp was developed to satisfy the need for an efficient, reliable, and reusable material to meet this new arsenic standard. ArsenXnp is a hybrid sorbent consisting of nanoparticles of hydrous iron oxide distributed throughout a porous polymeric bead. This combines the excellent handling, flow characteristics and attrition resistance of conventional ion exchange resins with the well-documented arsenic affinity of hydrous iron oxides. In field tests, the resin maintained an effluent arsenic concentration below 10 μg/L for 4 months of continuous operation with no mechanical problems and no pressure buildup across the resin bed. Arsenic is removed from solution due to the interaction with the nanoscale hydrous iron oxide surfaces rather than the anion exchange groups associated with the polymeric substrate, and the arsenic capacity is unaffected by common anions such as sulfate, chloride, or bicarbonate.

Original languageEnglish (US)
Pages (from-to)104-112
Number of pages9
JournalEnvironmental Engineering Science
Volume24
Issue number1
DOIs
StatePublished - Jan 10 2007

Keywords

  • ArsenX
  • Arsenic
  • Drinking water
  • Hybrid
  • Hydrous iron oxide
  • Nanoparticles
  • Sorbent

ASJC Scopus subject areas

  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

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