Abstract
The performance of Mn-TiO2/sepiolite photocatalysts prepared by the solgel method and calcinated at different temperatures was studied in the photocatalytic degradation of direct fast emerald green dye under visible light irradiation, and a series of analytical techniques such as XRD, SEM, FTIR, TG-DSC, XPS, UV-vis-DRS and Raman spectroscopy were used to characterize the morphology, structure and optical properties of the photocatalysts. It is found that the anatase TiO2 was formed in all photocatalysts. Mn4+ might incorporate into the lattice structure of TiO2 and partially replace Ti4+, thus causing the defects in the crystal structure and the broadening of the spectral response range of TiO2. At the same time, TiO2 particles were dispersed on the surface of the sepiolite, which immobilized TiO2 particles with sepiolite via the bond of Ti-O-Si. Mn-TiO2/sepiolite calcined at 400 °C exhibits the highest photocatalytic activity and the degradation rate of direct fast emerald green is up to 98.13%. Meanwhile, it also shows good stability and universality.
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