Production of Porous Carbon from Ion Exchange Resin Waste

概要

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The possibility to produce porous carbons with controlled micropores from waste ion exchange resins wasexamined. Two waste ion exchange resins were used as starting materials: one was used for desalination of water (Waste-P) and the other was used for refining suger (Waste-Gel). They were carbonized at 500 to 900°C were nonporousdue to thermal shrinkage. Waste-Gel contained about 7wt% of calcium, and Waste-P adsorbed organics. Then, to clarifythe effect of the impurities contained in the waste resins on the pore development, the virgin resins exchanged by calcium ion and those adsorbing phenol or fructose were prepared and carbonized. Calcium ion was found to greatly affect thecarbonization behavior of the resin, and consequently prevented the resin from shrinking thermally. On the other hand, the organics adsorbed enhanced thermoplastic property of the resin. When carbonized at 900°C, the Ca exchanged resinhad almost same pore volume distribution as the carbonized Waste-Gel had. This clarified that the pore developmentof the carbonized Waste-Gel is controlled by the calcium in the resin. The porous carbons produced from the waste resins had molecular sieving property to separate carbon dioxide from methane.
炭素材料学会の論文