Sorption Efficiency of Chitosan Nanofibers toward Metal Ions at Low Concentrations

Abstract

Chitosan fibers showing narrow diameter distribution with a mean of 42 nm were produced by electrospinning and utilized for the sorption of Fe(III), Cu(II), Ag(I), and Cd(II) ions from aqueous solutions. The ion concentrations in the supernatant solutions were determined using inductively coupled plasma-mass spectrometry (ICP-MS). The filtration efficiency of the fibers toward these ions was studied by both batch and microcolumn methods. High efficiency in sorption of the metal ions was obtained in the both methods. The effects of sorbent amount (0.10-0.50 mg), shaking time (15-120 min), initial metal ion concentration (10.0-1000.0 µg · L -1 ), and temperature (25 and 50°C) on the extent of sorption were examined. The sorbent amount did not significantly alter the efficiency of sorption; however, shaking time, temperature, and metal ion concentration were found to have a strong influence on sorption. By virtue of its mechanical integrity, the applicability of the chitosan mat in solid phase extraction under continuous flow looks promising.

Laccase Immobilization by Chelated Metal Ion Coordination Chemistry

“…Those results of the immobilized enzyme stability presented hereinbefore can be interpreted in terms of the size of the metal ions and electric density which could further determine the coordination capability between the chelate fiber ligand and the metal ions. According to Lewis theory [29] and Pearson rules [30], metal ions, which have small size, high positive electric, low polarization ability, and the property of being difficult to be deformed, are called hard acid. Hard acid such as Fe .…”

Synthesis of amidoximated polyacrylonitrile fibers and its application for sorption of aqueous uranyl ions under continuous flow

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Electrospun amino-functionalized PDMS as a novel SPME sorbent for the speciation of inorganic and organometallic arsenic species

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