Preparation and characterization of an organic/inorganic hybrid sorbent (PLE) to enhance selectivity for As(V)

Byungryul An, Hakchan Kim, Sang Hyup Lee, Jae Woo Choi

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

For the selective removal of arsenate (As(V)) a hybrid sorbent was prepared using a non-toxic natural organic material, chitosan, by loading a transition metal, nickel. The immobilization of nickel was achieved by coordination with a deprotonated amino group (NH2) in the chitosan polymer chain. The amount of nickel was directly correlated to the presence of the amino group and was calculated to be 62mg/g. FTIR spectra showed a peak shift from 1656 to 1637cm-1 after Ni2+ loading, indicating the complexation between the amino group and nickel, and a peak of As(V) was observed at 834cm-1. An increase of sulfate concentration from 100mg/L to 200mg/L did not significantly affect As(V) sorption, and an increase in the concentration of bicarbonate reduced the As(V) uptake by 33%. The optimal pH of the solution was determined at pH 10, which is in accordance with the fraction of HAsO42- and AsO4-3. According to a fixed column test, a break through behavior of As(V) revealed that selectivity for As(V) was over sulfate. Regeneration using 5% NaCl extended the use of sorbent to up to uses without big loss of sorption capacity.

Original languageEnglish
Pages (from-to)54-62
Number of pages9
JournalJournal of hazardous materials
Volume289
DOIs
Publication statusPublished - 2015 May 1

Keywords

  • Arsenate
  • Chitosan
  • Polymeric ligand exchagner
  • Selectivity

ASJC Scopus subject areas

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

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