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By Sydney Marks

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24). 7. These indicate the selectivity series Cu2þ > Ni2þ,Cd2þ > Zn2þ. The increase in the concentration above the feed was due to chromatographic elution. A solution containing copper, zinc, nickel, and cadmium was used to obtain the selectivity of BGP AOx. The results shown in Fig. 25 indicate a selectivity order of Cu2þ > Ni2þ > Zn2þ,Cd2þ. These studies confirm that both materials are highly selective toward copper in the presence of other metal ions. The results of the minicolumn experiments for various samples of F400 are summarized in Table 18.

Chemical oxidation is commonly used to introduce these functional groups onto the surface of carbons. The sorptive capacity and selectivity of oxidized carbons vary for different metal ions, and higher valence metal ions are usually preferred to those of lower valence [42,43]. It has also been observed that selectivity differs even within a series of metals with the same valence. Among divalent metals, Cu2þ is generally the most preferred ion. However, the reasons for the higher affinity of oxidized carbons toward this particular metal ion have not been clearly identified.

The generalization of metal sorptive behavior using the Irving–Williams approach leads to a novel way of understanding metal sorption by active carbons and other carbonaceous adsorbents. We performed minicolumn experiments to determine breakthrough characteristics and regeneration performance. Adsorbents were used in as-received and oxidized form for the removal of copper, nickel, zinc, and cadmium from aqueous solution. A brief summary of materials (including surface oxidation conditions) used for obtaining breakthrough column data is provided in Table 8.

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A textbook of inorganic chemistry vol.VI part III Vanadium, Niobium, and Tantalum by Sydney Marks

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