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.
Restricted to Registered users only
Download (186Kb) | Request a copy
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|
Actions (login required)