Photodiscoloration of textile reactive dyes on Ni/TiO2 prepared by the impregnation method: Effect of calcination temperature

In this work, we report the preparation of Ni/TiO2 (2 and 5 wt%) catalysts by the impregnation method and calcinations temperature (250, 300 and 400 °C) for the discoloration of dyes reactive orange-122, reactive blue-19 and reactive yellow-145 under artificial and solar light. The characterization techniques used were: N2 adsorption measurements (BET method), scanning electron microscopy (SEM) with energy dispersive X-ray (EDS), temperature programmed reduction (TPR), X-ray diffraction (XRD), thermogravimetric analyzer (TGA) and photoacoustic spectroscopy (PAS). The experimental results under artificial light indicate that the photocatalyst 5% Ni/TiO2 calcined at 400 °C discolored dye reactive yellow-145 aqueous solutions 91.78% in 8 h, in contrast to 2% Ni/TiO2 calcined at 400 °C with 41.82% to dye reactive blue-19 and 5% Ni/TiO2 calcined at 250 °C to dye reactive orange-122 with 48.20%. The photocatalyst 5% Ni/TiO2 calcined at 400 °C under solar irradiation in 60 min, is more efficient in the discolored dye reactive orange-122 aqueous solutions 92.16%.

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