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Raw, iron oxide, and aluminum oxide impregnated carbon nanotubes (CNTs) were found to be effective adsorbents for the removal of Cr(VI) ions from aqueous solution.
Regarding the adsorption of 2,4-DNP, the situation is extremely different, because while for carbon impregnated adsorbent 2,4-DNP (G_D) the value of qo is 0.732, this same value is twice as high for phosphoric acid impregnated carbon (GPD: 1.628).
The space agency had originally baselined Phenolic Impregnated Carbon Ablator (PICA), but in subsequent testing it was outperformed by Avcoat.