Photoinduced oxidative transformation of diphenylamine on Al2O3 with enhancement by ZnO synergism

Abstract

Diphenylamine (DPA) in ethanol on the surface of Al 2 O 3 undergoes light-induced oxidative transformation affording N-phenylp-benzoquinonimine (PBQ). The photoinduced transformation on Al 2 O 3 enhances with [DPA], Al 2 O 3 -loading, airflow rate and photon flux. The formation of PBQ on Al 2 O 3 is larger under UV-C light than under UV-A light. The Al 2 O 3 surface does not lose it activity on reuse. The mechanism of photoinduced oxidative transformation of DPA on Al 2 O 3 has been discussed with appropriate kinetic law. ZnO enhances the UV light-induced transformation of DPA on Al 2 O 3 indicating synergism.