Abstract
Adsorption from the n-butanol-benzene system on two carbon black heterogeneity sequences was studied at 25°. In one sequence, increasing the concentration of the heterogeneity, edge carbon atoms, increased the benzene preferential adsorption. In the other sequence introduction of the heterogeneity, surface oxide groups, was sufficient to cause some butanol preference. However, the butanol preference only increased slightly with increasing oxide coverage. Adsorption preferences were lower than the preferences for the methanol—benzene system on the same two surface sequences. Qualitatively the trends with coverage are explained by the strong edge carbon benzene monomer interaction and the low acidity of the butanol monomer. Monolayer mass balance theory indicated a benzene multilayer, or near multilayer, developed as a function of edge fraction. This theory again failed in monolayer cases, although less drastically than with methanol—benzene. The importance of surface group heterogeneity in solution adsorption is confirmed.
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