A novel route for preparation of Magnéli titanium suboxides by aluminothermic reductionand their photocatalytic activity under visible light

Abstract:

Magnéli-phases titanium suboxides have been successfully prepared by our aluminum reduction-hydrochloric acid leaching route. The resulting sample was characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), UV-visible diffuse reflectance spectroscopy (UV-Vis DRS) and X-ray photoelectron spectroscopy(XPS).The Characterization results show that the mother phase was Ti4O7 of magnéli phase titanium oxide could be prepared at the calcination temperature of 950°C,roasting time for 20 min and the amount of aluminum was 0.2.The as-prepared magnéli-phase titanium suboxides samples with the diameters of 400~600nm, the surface of magnéli-phase titanium suboxides formation of oxygen vacancies, which has strong UV and visible-light absorption property. The degradation efficiency of 37%, 43%, and 62% was achieved for the as-prepared magnéli-phase titanium suboxides samples after visible light irradiation for 130min.