Iron oxide microcrystallites incorporated in sodium montmorillonite clay interlayers exhibited ca. 0.28 eV greater band gap than α-Fe2O3 bulk powder, and the Fermi level of the former was 0.23 V more negative than that of the latter. Photocatalytic activities for photodecomposition of acetic acid was higher at the iron oxide microcrystallites than those of α-Fe2O3 powder, the activity difference exceeding the surface area difference between the two.
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Miyoshi et al. (1989) studied this question.