上转换/半导体核壳结构纳米复合材料光催化研究进展

Review on the photocatalytic properties of upconversion semiconductor core-shell nanocomposites

上转换荧光材料具有将近红外光转换为紫外光和可见光的光学性能,与传统的半导体材料复合,使其光谱响应拓展到近红外区域,充分利用太阳光,从而提高光催化效率。核壳结构除能够有效地防止核(上转换纳米材料)被污染失活外,还可以使其紧密接触,有利于荧光共振能量的传递,提高壳(半导体材料)对光的利用率。系统论述了上转换半导体核壳结构纳米复合材料的制备方法、催化降解效率和催化影响因素,对此类复合材料的结合和催化机理进行分析,指出今后应加强高效率荧光材料和催化活性更强的半导体材料复合及如何在实际中应用的研究。

Upconversion luminescent materials have optical property of converting near-infrared（ NIR）light into ultraviolet and visible light（ Vis）. The absorption range of traditional semiconductor materials is extended to NIR region by combining with upconversion luminescent materials to make full use of sunlight. Photocatalytic activities of nanocomposites are improved. Core-shell structure can not only effectively prevent contamination of core material（ upconversion material）,but also make them in close contact to facilitate the transmission of fluorescence resonance energy,thus more light is utilized by shell material（ semiconductor material）. In this paper,preparation of synthetic materials,degradation rate of organic pollutants,and effects of reaction conditions on degradation rate were systematically discussed.Combination and catalytic mechanism of core-shell structured nanocomposites were analyzed. Finally,it was pointed out that study on recombination of high efficiency fluorescent materials and more catalytic active semiconductor materials,application in the future should be strengthened.