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采用溶胶-电泳沉积技术,在多孔氧化铝模板中合成了二氧化钛(TiO_2)纳米线阵列结构。研究了La~(3+)/Fe~(3+)共掺杂对TiO_2纳米线可见光催化性能的影响,并分别与La~(3+),Fe~(3+)单掺杂TiO_2纳米线可见光催化性能进行了比较。结果表明:与La~(3+),Fe~(3+)单掺杂TiO_2纳米线相比,La~(3+)/Fe~(3+)共掺杂TiO_2纳米线具有更高的可见光催化活性,光照4h对甲基橙的降解率就达到了90%以上,大幅度提高了TiO_2的可见光催化活性,这是因为2种不同体系离子的协同作用,不仅有效抑制了光生电子和空穴的复合,而且明显降低了TiO_2的禁带宽度,由3.24降低到2.38。研究还表明:TiO_2纳米线阵列极大的比表面积以及表面特有的性质和结构是掺杂改性TiO_2纳米线具有较高可见光催化活性的重要因素。
The structure of titania (TiO 2) nanowire arrays was synthesized by sol-gel electrophoresis in a porous alumina template. The effect of La ~ (3 +) / Fe ~ (3 +) codoped on the visible light photocatalytic activity of TiO_2 nanowires was studied and compared with that of La ~ (3 +), Fe ~ (3+) Visible light catalytic properties were compared. The results show that La 3+ / Fe 3+ doped TiO 2 nanowires have higher visible light than La 3+ and Fe 3+ doped TiO 2 nanowires. Catalyzed activity, the degradation rate of methyl orange reached more than 90% after 4 h of light irradiation, which greatly enhanced the visible light photocatalytic activity of TiO 2 because the synergistic effect of the two different system ions not only effectively inhibited the photogenerated electron and hole , And significantly reduced the band gap of TiO_2 from 3.24 to 2.38. The research also shows that the extremely large specific surface area of TiO 2 nanowire arrays as well as the surface-specific properties and structures are important factors for the high photocatalytic activity of doped TiO 2 nanowires.