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A Superfast Sorbent Based on Textile-Grade Poly(acrylonitrile) Fiber/Fabric. Rapid Removal of Uranium from Mildly Acidic Aqueous Solutions of Low Concentration

Chanda, M and Rempel, GL (2003) A Superfast Sorbent Based on Textile-Grade Poly(acrylonitrile) Fiber/Fabric. Rapid Removal of Uranium from Mildly Acidic Aqueous Solutions of Low Concentration. In: Industrial & Engineering Chemistry Research, 42 (22). pp. 5647-5655.

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Abstract

Poly(ethyleneimine) cross-linked with glutaraldehyde has been coated on partially hydrolyzed poly(acrylonitrile) (textile grade), used in fiber as well as fabric form, by a copper-mediated gel-coating process. For uranium sorption from aqueous solutions at low substrate concentrations (1 \le mmol/L), the gel-coated fiber or fabric, containing 15% resin (w/w on a dry basis), exhibits an order of magnitude higher sorption capacity and 2 orders of magnitude higher initial rate of sorption, as compared to conventional bead-form anionic resin Dowex 21K. For example, in a 1 mM solution of $UO_2SO_4$ at pH 4.0, the sorption capacities of the gel-coated fiber and Dowex 21K resin beads are respectively 106 and 12 mg of U/g of dry sorbent, while the initial rates of sorption are 3.5 and 0.02 mg of U/(g of dry sorbent)(s), respectively. With the sorption on the gel-coated fiber being by both ion exchange and chelation, it shows a significantly greater salt (NaCl) tolerance than Dowex 21K on which the sorption takes place only by ion exchange. Following fast stripping with dilute mineral acid, the gel-coated fiber is regenerated by a simple wash with dilute alkali to its original capacity. The sorption rate data on the fiber, in the initial stage, fit to a shell-core model equation derived for a cylindrical-shaped sorbent of a very large length/diameter ratio.

Item Type: Journal Article
Additional Information: The Copyright belongs to American Chemical Society.
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 16 May 2006
Last Modified: 19 Sep 2010 04:26
URI: http://eprints.iisc.ernet.in/id/eprint/6690

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