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- W2464073209 abstract "Graphitic carbons and graphites are widely used as catalyst supports for metals such as Pt and Cu. The catalysts are prepared by various impregnation procedures involving adsorption of metals salts from aqueous solutions, often with the addition of organic compounds lowering the surface tension of water. It is not clearly known in what state the individual adsorbed ions exist in the surface of the carbons, but it is often assumed that they interact with polar groups invariably present on the surface of the carbons. Until very recently the adsorption of the ions on pure graphitic surfaces, containing only negligible concentrations of polar sites has hardly been studied at all and it was tacitly assumed that the graphitic basal planes do not adsorb inorganic ions from aqueous solutions. Recent work with sensitive Flow Microcalorimeters has demonstrated that the graphitic basal planes can strongly interact with a variety of ions in aqueous solutions. The interactions are especially energetic with heavy transition metals such as gold, platinum and mercury. Certain anions such as CN{sup -} and SH{sup -} and S{sup =} (but not Ci{sup -}, SO and NO{sub 3}) are also strongly adsorbed and can effectively compete with the heavy metal cations, especiallymore » when present in relatively high concentrations. The heats of adsorption from water to most transition metals at surface coverages below 5% reach very high values and usually range from 200-300 kJ mol{sup -}. Nearer to the surface saturation levels, the heats of adsorption drop to about 70-80 kJ mol{sup -}. Some of the basal plane sites are therefore, capable of adsorbing the metals especially strongly. Adsorption/desorption experiments at room temperatures demonstrate, in fact, that the adsorption on the more active basal plane sites is virtually irreversible. Desorption can be obtained, however, with solutions of anions having a strong affinity for the graphite surface and/or the ability to complex the cations in solution.« less" @default.
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- W2464073209 date "1995-12-31" @default.
- W2464073209 modified "2023-09-27" @default.
- W2464073209 title "Chemisorption of metal ions from aqueous solutions on graphitic carbons" @default.
- W2464073209 hasPublicationYear "1995" @default.
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