Photodegradation of Methylene Blue over Cr Doped TiO_2 and Cr Doped TiO_2 Supported TUD-1 Photocatalysts

摘要

A series of visible light driven photocatalysts of Cr-doped TiO_2 and Cr-doped TiO_2 supported on TUD-1 have been successfully synthesized via surfactant-free sol-gel method followed by wet impregnation procedure. XRD analysis revealed that both anatase and rutile phases existed in Cr-doped TiO_2 samples. After loading onto TUD-1, both Ti and Cr were incorporated in the highly porous siliceous matrix. As observed, more tetrahedrally coordinated Ti species was formed in Cr-doped TiO_2 after supporting onto TUD-1. The photocatalytic performance of the synthesized materials was tested in the photodegradation of Methylene Blue under visible light irradiation. Results showed that 2.5 mol% Cr dopant gave the highest photocatytic activity to TiO_2 in dye photodegradation. Besides, all the 2.5Cr-TiO_2 supported on TUD-1 materials had higher photocatalytic activity than that of 2.5Cr-TiO_2. Among the materials prepared, 2.5Cr-TiO_2/30TUD-1 appeared as the most superior photocatalyst which gave the highest dye photodegradation of 75%.