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J Hazard Mater. 2015 May 30;289:54-62. doi: 10.1016/j.jhazmat.2015.02.029. Epub 2015 Feb 11.

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

Author information

1
Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5 Seongbuk-gu, Seoul 136-791, Republic of Korea.
2
Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5 Seongbuk-gu, Seoul 136-791, Republic of Korea; Green School, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 136-701, Republic of Korea.
3
Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5 Seongbuk-gu, Seoul 136-791, Republic of Korea; Department of Energy and Environmental Engineering, University of Science and Technology (UST), Daejeon 305-350, Republic of Korea. Electronic address: plead36@kist.re.kr.

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 62 mg/g. FTIR spectra showed a peak shift from 1656 to 1637 cm(-1) after Ni(2+) loading, indicating the complexation between the amino group and nickel, and a peak of As(V) was observed at 834 cm(-1). An increase of sulfate concentration from 100 mg/L to 200 mg/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 HAsO4(2-) 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.

KEYWORDS:

Arsenate; Chitosan; Polymeric ligand exchagner; Selectivity

PMID:
25704435
DOI:
10.1016/j.jhazmat.2015.02.029
[Indexed for MEDLINE]

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