X-ray photoelectron spectroscopy (XPS) has been used to obtain surface chem
ical state information on two carbon black waste materials in terms of the
surface element distribution/concentration and chemical structure. Small am
ounts of sulfur in the form of CS, were detected on the surface (less than
1.7 mass %). C-H/C-C was the major carbon functional component on the surfa
ce of carbon black samples but other functional forms of carbon were also p
resent such as C=O and C-O. The surface of the carbon black obtained from a
hydropyrolysis process was highly oxidized primarily in the form of carbon
based oxygen groups. On the other hand, surface oxygen atoms on the surfac
e of the carbon black obtained from a pyrolysis process in the absence of H
-2 were in the form of both metal oxides and carbon based oxygen groups. (C
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