China Nonferrous Metallurgy

In this paper, titanium concentrate and anhydrous potassium carbonate were used as raw materials to synthesize potassium ferrite composites in situ by oxidation roasting process. The roasted products prepared at different roasting temperatures were characterized and their photocatalytic degradation performance was evaluated. The phase composition, valence state, spectral absorption and microscopic morphology of the roasted products were characterized by XRD, XPS, UV-Vis and SEM. The results show that the calcined product after oxidation roasting is mainly composed of potassium ferrite, potassium titanate and potassium titanium ferrite. Potassium ferrite and potassium titanate are unevenly attached to the surface of potassium titanium ferrite crystal; iron and titanium exist in the form of Fe3+ and Ti4+, respectively; When the calcination temperature is 750℃, 850℃ and 950℃, the band gaps of the synthesized potassium titanate composites are 1.25eV, 1.15eV and 1.45eV, respectively; photocatalytic performance test results show that with the increase of calcination temperature, the photocatalytic degradation performance of calcined products for methylene blue first increases and then decreases, and the potassium titanoferrite composites at 850℃ reach the optimum, up to 98.3%; when methyl orange is used as a pollutant, the degradation effect of calcined products is better with the increase of calcination temperature, and the degradation rate can reach 56.6% at 1000℃.