Electroactive Materials for Anion Separation-Technetium from Nitrate

Hubler, Timothy L. ; McBreen, James ; Smyrl, William H. ; Lilga, Mike A. ; Rassat, Scot D.

Pacific Northwest National Laboratory (U.S.)

关键词: Ion Exchange Materials;    Capacity;    Nitrates;    Polymers;    Implementation;   

DOI  :  10.2172/839061
RP-ID  :  EMSP-81912--2004
RP-ID  :  839061

美国|英语

来源: UNT Digital Library

【 摘 要 】

The aim of the proposed research is to use electroactive ion exchange materials to remove anionic contaminants from HLW wastes and process streams. An ion exchange process using electroactive materials sorbs contaminants selectively and then expels (elutes) them electrochemically by changing the charge balance through redox reactions in the sorbent as opposed to requiring the addition of a chemical eluent. Such processes can theoretically remove anions (e.g., pertechnetate, chromate, and perchorate) and concentrate them in a separate product stream while adding no process chemicals. A practical implementation in HLW process facilities would be a breakthrough in the ability of DOE to economically minimize waste and prevent pollution throughout the complex. To enable this, our work focuses on manipulating specific properties of redox polymers to control the hydrophobicity and ion-pair properties pertinent to the reversibility, selectivity, stability, intercalation/de-intercalation rates, and capacity of the polymers.