铝热还原法制备Magnéli相亚氧化钛及其可见光光催化活性研究

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

摘要:

采用铝热还原-盐酸酸洗工艺成功制备了Magnéli相亚氧化钛,通过X-ray diffraction (XRD), Scanning electron microscopy (SEM),UV-visible diffuse reflectance spectroscopy (UV-Vis DRS) 和X-ray photoelectron spectroscopy(XPS)等手段进行表征表明：在焙烧温度950℃,焙烧时间20min,Al/TiO₂=0.2时,成功制备以Ti₄O₇为主要物相的Magnéli相亚氧化钛材料,其粒径为400~600nm,样品表面形成了大量的氧空位,表现出很强的紫外和可见光吸收性能。在可见光条件下光照130min时,950℃焙烧20min,25min和35min条件下制备并酸洗后的Magnéli相亚氧化钛降解亚甲基蓝的效率分别达到37%,43%和62%。

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.