银系半导体光催化材料研究进展

Recent Progress on Ag-based Semiconductor Photocatalysts

银系半导体由于较窄的带隙和单质银的表面等离子体共振效应,普遍对可见光响应且具有理想的可见光光催化活性,在有机污染物降解、二氧化碳还原和杀毒灭菌等环境光催化领域具有广阔的应用前景。银离子可以与各种负离子或负离子基团形成种类繁多的银基卤化物、氧化物、硫化物和含氧酸盐等半导体光催化材料。银系半导体的光催化活性和稳定性高度取决于这些负离子或负离子基团的性质。综述了分别由卤族、硫族、氮族、碳族、硼族和过渡金属元素构成的负离子或负离子基团对银系半导体能带结构、光学吸收以及光催化活性的影响,探讨了提高银系半导体可见光光催化活性和稳定性的策略,并展望了未来的研究方向,从而有助于人们构建更高效的银系半导体光催化材料(体系)。

Ag-based semiconductors commonly respond to visible light and exhibit the excellent photocatalytic activity under visible-light irradiation due to their narrow band gap and surface plasmon resonance （SPR） adsorption, thus having a promising application as Ag-based photocatalysts in organic pollutant degradation, dioxide carbon reduction and bacteria inactivation. Ag-based photocatalysts can be fabricated by chemically combing Ag iron and various anions （i.e., anion groups）, including halides, sulphides, oxides and oxysalts. The photocatalytic activity and stability of Ag-based photocatalysts greatly depend on those anions （anion groups）, which are formed by halogen, chalcogen, nitrogen, carbon and boron group and transition metal element. This review systematically summarized the effect of anions （anion groups） on the photocatalytic activity and stability of Ag-based photocatalysts. The perspectives for the further investigation were proposed. This review can provide the information for constructing more efficient Ag-based semiconductor photocatalyst.