Preparation and characterization of an organic/inorganic hybrid sorbent (PLE) to enhance selectivity for As(V)
- Preparation and characterization of an organic/inorganic hybrid sorbent (PLE) to enhance selectivity for As(V)
- 안병렬; 김학찬; 박찬혁; 이상협; 최재우
- Polymeric ligand exchanger; Arsenate; Selectivity; Chitosan
- Issue Date
- Journal of hazardous materials
- VOL 289, 54-62
- For the selective removal of arsenate (As(V)) a hybrid sorbent was prepared using a non-toxic naturalorganic material, chitosan, by loading a transition metal, nickel. The immobilization of nickel was achievedby coordination with a deprotonated amino group (NH2) in the chitosan polymer chain. The amount ofnickel was directly correlated to the presence of the amino group and was calculated to be 62 mg/g.FTIR spectra showed a peak shift from 1656 to 1637 cm−1after Ni2+loading, indicating the complexationbetween the amino group and nickel, and a peak of As(V) was observed at 834 cm−1. An increase of sulfateconcentration from 100 mg/L to 200 mg/L did not significantly affect As(V) sorption, and an increase inthe concentration of bicarbonate reduced the As(V) uptake by 33%. The optimal pH of the solution wasdetermined at pH 10, which is in accordance with the fraction of HAsO42−and AsO4−3. According to afixed 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.
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