纳米TiO_(2)可见光催化氧化有机污染物的研究进展

Research processes on nano TiO_(2) for visible-light photocatalytic oxidation of organic pollutants

纳米TiO_(2)较宽的带隙宽度决定了其只能被紫外光激发,从而限制了其在光催化氧化有机污染物领域的大规模应用。本文从纳米TiO_(2)自身可见光催化氧化、复合其他半导体氧化物、非金属元素掺杂3个方面综述了使纳米TiO_(2)可见光吸收增强,从而能够在可见光条件下光催化降解有机污染物的最新研究进展。其中,TiO_(2)与CeO_(2)、MnO_(2)、Co_(3)O_(4)等半导体氧化物复合既能实现复合催化剂在太阳光全光谱范围的吸收,又能通过光热协同催化效应大幅提高其氧化有机污染物的活性,具有较大应用潜力。

The wide band gap of nano TiO_(2) determines that it can only be excited by ultraviolet light,which limits its large-scale application in the field of photocatalytic oxidation of organic pollutants.In this paper,the latest progresses on enhancement of visible-light absorption on nano TiO_(2) and photocatalytic degradation of organic pollutants under visible light are reviewed from 3 aspects of self photocatalytic oxidation of nano TiO_(2),compounding with other semiconductor oxides and doping of non-metallic elements.Wherein the composite of TiO_(2) and other semiconductor oxide,such as CeO_(2),MnO_(2),Co_(3)O_(4),etc.,can not only realize the absorption of full-spectrum sunlight on the composite catalysts,but also greatly improve its oxidation activity to organic pollutants through photothermal synergistic catalytic effect,which has great application potential.