By Arup K SenGupta; Yizhak Marcus
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The best result was obtained for the Ox9h-WW, with over Copyright © 2004 by Taylor & Francis Group, LLC Activated Carbons and Carbonaceous Materials 45 Figure 25 Breakthrough curve using a feed solution containing copper, nickel, zinc, and cadmium with a sample of BGP AOx. 7; ﬂow rate ¼ 5 BV=h. 100 BV of feed solution treated before breakthrough was detected. Figure 29 shows minicolumn results for cadmium. The results are similar to those for zinc and nickel, with similar breakthrough volumes treated before cadmium is detected for Ox9h-WW, Ox9h-AW, and Ox24h samples.
69 mmol=g for copper using an F400-Ox9h-WW sample. All the other samples had an uptake capacity between these two extremes. A 60-fold increase in copper uptake was obtained by acid oxidation compared to the unoxidized sample. Experiments were conducted to determine the ion-exchange performance after multiple sorption–desorption cycles. 1 M HCl after each sorption run. The results show that there was no signiﬁcant difference in breakthrough performance between as-received samples and the samples after four sorption–desorption cycles (see Fig.
The heteroatoms may be distributed at random within the carbon matrix, concentrated at the exposed surface of carbons, present at dislocations in the microcrystalline structure, or a combination of all three. Surface-bound heteroatoms may be considered analogs of substituted aromatic compounds. Copyright © 2004 by Taylor & Francis Group, LLC Activated Carbons and Carbonaceous Materials 21 Heteroatoms present in the core of the carbon matrix may be unreactive due to their inaccessibility and their mode of combination with local atoms.