The use of carbon aerogel electrodes for deionizing water and treating aqueous process wastes

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A wide variety of ionic contaminants can be removed from aqueous solutions by electrosorption on carbon aerogel electrodes. Carbon aerogel is an ideal electrode material because of its low electrical resistivity (< 40 m{Omega}-cm), high specific surface area (400 to 1100 m{sup 2}/g), and controllable pore size distribution (< 50 nm). This approach may avoid the generation of a substantial amount of secondary waste associated with ion exchange processing. Ion exchange resins require concentrated solutions of acid, base, or salt for regeneration, whereas carbon aerogel electrodes require only electrical discharge or reverse polarization. Aqueous solutions of NaCl, NaNO{sub 3}, NH{sub ... continued below

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14 p.

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Farmer, J.C.; Mack, G.V. & Fix, D.V. July 1, 1996.

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Description

A wide variety of ionic contaminants can be removed from aqueous solutions by electrosorption on carbon aerogel electrodes. Carbon aerogel is an ideal electrode material because of its low electrical resistivity (< 40 m{Omega}-cm), high specific surface area (400 to 1100 m{sup 2}/g), and controllable pore size distribution (< 50 nm). This approach may avoid the generation of a substantial amount of secondary waste associated with ion exchange processing. Ion exchange resins require concentrated solutions of acid, base, or salt for regeneration, whereas carbon aerogel electrodes require only electrical discharge or reverse polarization. Aqueous solutions of NaCl, NaNO{sub 3}, NH{sub 4}ClO{sub 4}, Na{sub 2}CO{sub 3}, Na{sub 2}SO{sub 4} and Na{sub 3}PO{sub 4} have been separated into concentrate and high-purity product streams. The deionization of a 100 {mu}S/cm NaCl solution with two parallel stacks of carbon aerogel electrodes in a potential-swing mode is discussed in detail. The selective removal of Cu, Zn, Cd, Pb, Cr, Mn, Co and U from a variety of process solutions and natural waters has also been demonstrated. Feasibility tests indicate that the remediation of Cr(VI)-contaminated ground water may be possible.

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14 p.

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OSTI as DE96013153

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  • 4. international congress on environmentally conscious design and manufacturing, Cleveland, OH (United States), 23-25 Jul 1996

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  • Other: DE96013153
  • Report No.: UCRL-JC--123461
  • Report No.: CONF-9607140--1
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 273790
  • Archival Resource Key: ark:/67531/metadc665002

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  • July 1, 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Feb. 18, 2016, 11:06 a.m.

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Farmer, J.C.; Mack, G.V. & Fix, D.V. The use of carbon aerogel electrodes for deionizing water and treating aqueous process wastes, article, July 1, 1996; California. (digital.library.unt.edu/ark:/67531/metadc665002/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.