Abstract
Diphenylamine (DPA) undergoes photocatalytic transformation on nanoparticulate ZnO surface yielding N-phenyl-<em>p</em>-benzoquinonimine (PBQ). The reaction rate increases with the increase of (i) DPA-concentration, (ii) ZnO-loading, (iii) airflow rate and (iv) light intensity. The formation of PBQ is larger on using UV-C light instead of UV-A light. The photocatalyst is reusable. The mechanism of the photocatalytic transformation has been discussed with a suitable kinetic law. Nanoparticulate TiO2, V2O5, CeO2 and ZnS enhance the ZnO-photocatalyzed PBQ formation indicating interparticle charge transfer in semiconductor mixtures.
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