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Sulfonated carbonaceous materials

  • US 20040042955A1
  • Filed: 08/28/2002
  • Published: 03/04/2004
  • Est. Priority Date: 05/23/2002
  • Status: Active Grant
First Claim
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1. A surface modified carbonaceous material, comprising a plurality of sulfonate substituents of the general formula —

  • SO3M surface bonded thereto, wherein M is hydrogen or a cationic species, and wherein the surface atomic concentration of sulfur present within the surface bonded SO3M moieties, measured by XPS, is greater than or equal to approximately 0.25% relative to the total surface atomic concentration of the surface treated carbonaceous material.

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