Effect of Surface Groups on Adsorption of PollutantsEnvironmental Protection Agency, Water Quality Office, 1970 - 29 páginas |
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Palavras e frases frequentes
acidic functional groups acidic groups acidic surface oxides ACTIVATED CARBON COLUMBIA activated sludge Activation Energies Active Carbon CF active carbon LC325 Adsorption Isotherms Adsorption of Dextrose adsorption of phenol adsorptive capacity ammonium persulfate AMOUNT ADSORBED AQUEOUS SOLUTION Base Consumption behavior cal/mole carbon adsorbent Carbon CF 300 CARBON COLUMBIA LC325 carbon sample carbon surface chemical COLUMBIA CARBON LC325 CONTROL RESEARCH SERIES COOH Darco S51 Dextrose on Active DEXTROSE ON CF300 hydrogen hydrogen bond ISOTHERMS OF DEXTROSE ISOTHERMS OF PHENOL LACTONE Lake Tahoe meq/gm microcrystalline carbon OCCUPIED BY PHENOL organic compounds outgassed oxides of carbon oxidized carbon oxidizing agent PARTICLE SIZE RANGE PHENOL ON ACTIVATED polarimeter POLLUTION CONTROL RESEARCH pore structure rate constant Rate of Adsorption regeneration SODIUM BENZENE sodium benzenesulfonate sodium bicarbonate solu SOLUTION AT 30.0°C sorption of phenol sorptive specific surface area SULFONATE ON ACTIVATED SURFACE CHEMISTRY Untreated Carbons urea WATER POLLUTION WATER POLLUTION CONTROL Water Quality Office
Passagens conhecidas
Página 4 - NaHCO3, etc. Accordingly, simple titration with different bases serves to identify the acidic surface oxides present on a given sample of carbon. It is possible to produce these acidic functional groups by oxidation in air or pure oxygen or by mixing the carbon sample with aqueous solutions of oxidizing agents like NaOCl, KMnO4, or (NH^SzOg.
Página 3 - Fig. 1. A graphite layer, which may be regarded as analogous to a very large, polynuclear aromatic molecule contains carbon atoms joined by a bonds to three neighboring carbon atoms with the fourth electron of each atom participating in a ^-bond (up2 hybridization).
Página 3 - TTelectron system, except where they are bound at lattice defects. Most important and best known among the surface compounds of carbon are those with oxygen and sulfur, although other elements such as chlorine and hydrogen can also combine with elemental carbon. Of these compounds the surface oxides...
Página 29 - Role of surface acidity in the adsorption of organic pollutants on the surface of carbon.
Página 4 - Boehm (6) has pointed out that they are formed after an outgassed carbon surface comes into contact with oxygen after cooling in an inert atmosphere. Of the many techniques for characterizing the acidic surface oxides of carbon, the method used extensively by Boehm, Diehl, et al.
Página 4 - It is also possible to partially remove the acidic functional groups by reduction or vacuum outgassing at elevated temperatures. In addition, these groups can be made to react in other ways such as esterification, formation of acid chlorides, and acetylation. MATERIALS AND METHODS Three different microcrystalline carbons were employed in this work: (1) an active carbon "Columbia Carbon LC325...
Página 3 - free valences" at the edges of the graphitic layer planes of microcrystalline carbon are very reactive and form compounds with any suitable foreign atoms present. It follows that functional groups or surface compounds can be expected almost exclusively at the layer edges; foreign atoms or molecules can be only weakly adsorbed on the basal faces by means of the graphitic TTelectron system, except where they are bound at lattice defects.