Abstract
Copper- and chromium-impregnated and non-impregnated charcoals have been characterized by X-ray photoelectron spectroscopy and scanning electron microscopy, showing the composition and distribution of elements in the charcoal substrate. Water (as D 2O) was reacted with dried charcoals and its gradual thermal desorption was studied by mass spectrometry. The impregnated charcoal retains substantially more water over a wider temperature span. It is suggested that Cr 3+, in particular, increases the number of high-energy adsorption sites. Thermal desorption also results in decomposition of metal hydroxides and reduction of Cu 2+ to Cu + and Cr 6+ to Cr 3+.
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