title: Preparation and characterization of an organic/inorganic hybrid sorbent (PLE) to enhance selectivity for As(V).
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.
authors.affiliation: Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5 Seongbuk-gu, Seoul 136-791, Republic of Korea.
authors.forename: Byungryul
authors.initials: B
authors.lastname: An
authors.affiliation: Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5 Seongbuk-gu, Seoul 136-791, Republic of Korea.
authors.forename: Hakchan
authors.initials: H
authors.lastname: Kim
authors.affiliation: Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5 Seongbuk-gu, Seoul 136-791, Republic of Korea.
authors.forename: Chanhyuk
authors.initials: C
authors.lastname: Park
authors.affiliation: 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.
authors.forename: Sang-Hyup
authors.initials: SH
authors.lastname: Lee
authors.affiliation: 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.
authors.forename: Jae-Woo
authors.initials: JW
authors.lastname: Choi
mesh_terms: D000327:Adsorption; D001149:Arsenates / Q000737:chemistry; D001151:Arsenic / Q000737:chemistry*; D002614:Chelating Agents; D048271:Chitosan; D004563:Electrochemistry; D006863:Hydrogen-Ion Concentration; D058116:Lewis Acids; D008855:Microscopy, Electron, Scanning; D009532:Nickel / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: D001149:Arsenates; D002614:Chelating Agents; D058116:Lewis Acids; D009532:Nickel; D048271:Chitosan; D001151:Arsenic
keywords: Arsenate; Chitosan; Polymeric ligand exchagner; Selectivity