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Performance of a Functionalised Polymer-Coated Silica at Treating Uranium Contaminated Groundwater from a Hungarian Mine Site

Stewart, D.I., Csõvári, M., Barton, C.S., Morris, K. and Bryant, D.E. (2006) Performance of a Functionalised Polymer-Coated Silica at Treating Uranium Contaminated Groundwater from a Hungarian Mine Site. Engineering Geology, 85 (1-2). pp. 174-183. ISSN 0013-7952

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Abstract

The performance of an active material for treating uranium contaminated groundwater within a permeable reactive barrier (PRB) is reported. This material, called PANSIL, has a tailored ligand system that selectively removes the uranyl (UO22+) cation from solution. The active uranyl ligand in PANSIL is a polyacryloamidoxime resin derived from polyacrylonitrile, which is deposited from solution onto the surface of quartz sand to form a thin film coating. PANSIL is effective at sequestering cationic and neutral uranyl species when the solution pH is above 4, due to the stability of the polyacryloamidoxime-uranyl complex formed. However the rate of sequestration decreases rapidly when the pH exceeds about 8 where neutral uranyl species are present only at very low concentrations. It can preferentially sequester UO22+ in the presence of typical divalent groundwater cations. In mildly alkaline conditions the sequestration performance in groundwater is sensitive to the concentration of uranyl complexing ligands, such as bicarbonate. Such behaviour has important consequences for PRB design as it will determine the barrier thickness required to treat a particular groundwater flow rate.

Item Type: Article
Copyright, Publisher and Additional Information: © 2006 Elsevier B.V. All rights reserved. This is an author produced version of a paper published in Engineering Geology.
Keywords: Groundwater; Reaction rate; Permeable reactive barrier; Uranium; Groundwater remediation; Adsorption
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Civil Engineering (Leeds)
The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Environment (Leeds)
The University of Leeds > Faculty of Engineering (Leeds) > School of Civil Engineering (Leeds) > Inst for Pathogen Control Engineering (Leeds)
Depositing User: Douglas I Stewart
Date Deposited: 21 Jun 2006
Last Modified: 05 Jun 2014 12:12
Published Version: http://dx.doi.org/10.1016/j.enggeo.2005.09.037
Status: Published
Publisher: Elsevier
Refereed: Yes
Identification Number: 10.1016/j.enggeo.2005.09.037
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/1327

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