Arsenic (III,V) removal from aqueous solution by ultrafine α-Fe2O3 nanoparticles synthesized from solvent thermal method

Wenshu Tang, Qi Li, Shian Gao, Jian Ku Shang

Research output: Contribution to journalArticlepeer-review

Abstract

Ultrafine iron oxide (α-Fe2O3) nanoparticles were synthesized by a solvent thermal process and used to remove arsenic ions from both lab-prepared and natural water samples. The α-Fe2O3 nanoparticles assumed a near-sphere shape with an average size of about 5nm. They aggregated into a highly porous structure with a high specific surface area of ∼162m2/g, while their surface was covered by high-affinity hydroxyl groups. The arsenic adsorption experiment results demonstrated that they were effective, especially at low equilibrium arsenic concentrations, in removing both As(III) and As(V) from lab-prepared and natural water samples. Near the neutral pH, the adsorption capacities of the α-Fe2O3 nanoparticles on As(III) and As(V) from lab-prepared samples were found to be no less than 95mg/g and 47mg/g, respectively. In the presence of most competing ions, these α-Fe2O3 nanoparticles maintained their arsenic adsorption capacity even at very high competing anion concentrations. Without the pre-oxidation and/or the pH adjustment, these α-Fe2O3 nanoparticles effectively removed both As(III) and As(V) from a contaminated natural lake water sample to meet the USEPA drinking water standard for arsenic.

Original languageEnglish (US)
Pages (from-to)131-138
Number of pages8
JournalJournal of Hazardous Materials
Volume192
Issue number1
DOIs
StatePublished - Aug 15 2011

Keywords

  • Adsorption
  • Arsenate
  • Arsenite
  • Competing anions
  • α-FeO nanoparticles

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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