Vibrational frequencies of the impurity-centred oxygen tetrahedra in sillenites

Self-assembled hierarchical Bi12TiO20–graphene nanoarchitectures with excellent simulated sunlight photocatalytic activity

“…Bi 12 TiO 20 exhibits two intensive peaks at 1391 and 1468 cm À1 , which are assigned to the n 3 vibrational mode of TiO 4 tetrahedral units of Bi 12 TiO 20 ; the peaks at 451, 520, 661 and 845 cm À1 are ascribed to Bi-O vibration modes, corresponding to the characteristic peaks of sillenite. 29,30 After the solvothermal reduction process, the peak intensity of CQO group of GR (1734 cm À1 ) decreases significantly; additionally, the peak intensities of C-O, C-O-C and C-OH groups become weaker. The above result indicates that most of oxygenous functional groups attached to the basal GO layers have been removed.…”