New insights into the origin of the visible light photocatalytic activity of Fe(iii) porphyrin surface anchored TiO2

Abstract

The chemisorbed Hemin molecule acts as a sensitizer under visible light and transfers photogenerated electrons to the TiO₂ conduction band through OC–O–Ti bonds which can act as electron transfer channels. The oxidized Hemin molecule is regenerated by triethanolamine a sacrificial electron donor.