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Fe(III)/Polydopamine-Mediated Capture and Release of Catecholic Compounds
Fe(III)/Polydopamine-Mediated Capture and Release of Catecholic Compounds
Bulletin of the Korean Chemical Society. 2014. Sep, 35(9): 2828-2830
Copyright © 2014, Korea Chemical Society
  • Received : March 17, 2014
  • Accepted : May 12, 2014
  • Published : September 20, 2014
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About the Authors
Suyeob Kim
Taewoo Gim
Ji Woo Park
Jongnam Kim
Department of IT Convergence and Application Engineering, Pukyong National University, Busan 608-737, Korea
Sung Min Kang

Abstract
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Experimental
Materials . Dopamine hydrochloride (98%, Aldrich), trizma base (99%, Sigma), trizma HCl (99%, Sigma), iron(III) chloride hexahydrate (FeCl 3 ·6H 2 O, 97%, Sigma-Aldrich), pyrocatechol violet (99%, Sigma-Aldrich), silica gel (99%, Sigma-Aldrich), and absolute ethanol (Merck) were used as received.
pDA Coating on Silica Beads . pDA coating was performed by combining silica gel (200-425 mesh particle size, 10 mg/mL) with a dopamine solution (10 mM, pH 8.5) at room temperature. After 1-hr coating, pDA-coated silica beads were separated from the suspension and washed several times by centrifuging/redispersing in water and ethanol.
Column Preparation and Fe(III) Complexation . 1 g of pDA-coated silica beads were suspended in ethanol and poured into the column. After packing, an ethanolic solution of FeCl 3 (10 mM, 10 mL) was added to the column for the complexation reaction. Residual FeCl 3 was then washed away with ethanol (50 mL).
Capture and Release of Pyrocatechol Violet (PCV) . 8 μmol of PCV was dissolved in ethanol and passed through the column. Non-captured PCV was monitored by UV-Vis spectroscopy. Captured molecules were then released by eluting with an EDTA solution (1 mM, pH 3.5). Typically, the eluent was added onto a column and allowed to flow forced by gravity. The elution of the PCV was analyzed by UV-Vis spectroscopy, and the detection wavelength was 445 nm.
Characterizations . X-ray photoelectron spectra were obtained using a MultiLab 2000 system (Thermo VG Scientific, UK) with a Mg Kα X-ray source and ultrahigh vacuum (~10 −10 mbar). UV-Vis spectroscopy was performed on a LAMBDA 35 UV/Vis spectrophotometer (Perkin Elmer).
Acknowledgements
Supporting Information. Figure S1 and 2.
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