Ordered mesoporous carbons synthesized by a modified sol-gel process for electrosorptive removal of sodium chloride
Date
2009
Authors
Li, L.
Zou, L.
Song, H.
Morris, G.
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Carbon, 2009; 47(3):775-781
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Abstract
Capacitive deionization (CDI) represents an alternative process to remove the ions from thebrackish water. In this study two series of ordered mesoporous carbons (OMCs) that dem-onstrated the potential use for capacitive desalination have been synthesized by a modifiedsol–gel process involving nickel salts. It was shown that the preferred formation of crown-ether type complexes between nickel ions and triblock copolymers resulted in higher BETsurface area and smaller mesopores. As the electrode materials for CDI, OMC obtained bythe addition of NiSO4Æ6H2O exhibited best electrochemical performance compared withother OMCs and a commercial activated carbon either in 0.1 M NaCl solution or in0.0008 M NaCl solution, plus the amount of adsorbed ions measured by a flow throughapparatus reached 15.9lmol g1and the ions could be fully released into the solution.The excellent electrosorption desalination performance of OMC obtained by the additionof NiSO4Æ6H2O was ascribed to its high BET surface area of 1491 m2g1and ordered mes-opores of 3.7 nm. Based on these results, it is deduced that the modified sol–gel processmight be a potential method of obtaining the excellent electrode materials for CDI.
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Copyright 2009 Pergamon