Preparation and Photocatalytic Studies on Nanocomposites of 4-Hydroxylphenyl-Substituted Corrole/TiO2 towards Methyl Orange Photodegradation

摘要

A new 5,15-di(4-chlorophenyl)-10-(4-hydroxylphenyl)corrole [H-3(OH-Cor)] and its corresponding copper complex [Cu(OH-Cor)] and cobalt complex [Co(OH-Cor)(PPh3)] were designed and synthesized to sensitize TiO2 nanoparticles. The photocatalytic activity of the obtained nanocomposites, which are represented as [H-3(OH-Cor)]/TiO2, [Cu(OH-Cor)]/TiO2 and [Co(OH-Cor)(PPh3)]/TiO2, was investigated by carrying out the photodegradation of methyl orange in aqueous solution under visible light irradiation. All the nanocomposites show much higher photocatalytic efficiency than the pure TiO2 nanoparticles. Especially, [Co(OH-Cor)(PPh3)]/TiO2 degraded 86.5 % of methyl orange under visible light irradiation for 2.5 h. Moreover, the nanocomposites can be easily separated for reuse and also maintained the high photodegradation efficiency over three successive degradation experiments. A possible photocatalytic mechanism is proposed.