A photocatalytic comparison study between tin complex and carboxylic acid derivatives of porphyrin/TiO2 composites

摘要

We synthesized a novel dihydroxotin(IV) porphyrin complex with full structural confirmation. The tin complex further converted to TiO2 composite (PR-2-TiO2) and photodegradation of methylene blue property compared with carboxylic-anchored porphyrin photocatalyst (PR-3-TiO2), basic porphyrin photocatalyst (PR-1-TiO2) and bare TiO2. PR-1-TiO2 showed slight photocatalytic activity, which was better than that of bare TiO2. The photocatalytic performances of tin-porphyrin (PR-2-TiO2) and carboxylic anchor porphyrin (PR-3-TiO2) were comparable, and tin-porphyrin catalyst showed similar stability in their reusability test result in comparison with carboxylic-anchored porphyrin catalyst. Finally, we showed a plausible structure for the tin porphyrin complex between the axial -OH ligand and TiO2 and a suitable mechanism with theoretical comparison for the photocatalytic process. Graphic abstract