ZnS/ZnO异质结光催化剂的应用研究进展

Research progress in application of ZnS/ZnO heterojunction photocatalysts

ZnS和ZnO具有无毒、环境友好和制备简单等优点,并且常温下拥有优异的物理化学特性和催化活性,一直都是光催化领域研究的热点材料。然而,单一的ZnS和ZnO光催化剂表现出低的太阳能利用率、量子效率和光稳定性,极大地限制了它们的实际应用。ZnS与ZnO复合形成的ZnS/ZnO异质结不仅可以拓宽光吸收波长范围,而且能促进载流子的转移和空间分离,增强光催化活性和稳定性。该文介绍了半导体异质结(Ⅱ型异质结、Z型异质结和S型异质结)中载流子的转移路径及光催化机理;综述了ZnS/ZnO异质结在降解有机污染物、分解水产氢、CO_(2)还原领域中的应用研究进展;总结了ZnS/ZnO异质结光催化性能影响因素及提升策略;最后,提出了ZnS/ZnO异质结催化剂目前存在的问题,并对未来的发展方向进行了展望。

ZnS and ZnO have always been hot research materials in the field of photocatalysis due to their non-toxicity,environmental friendliness,simple synthesis,excellent physical/chemical properties and high catalytic activity.However,single ZnS and ZnO photocatalysts usually suffer from low solar energy utilization,poor quantum efficiency and bad photostability,which greatly limit their practical applications.ZnS/ZnO heterojunctions can effectively broaden the light-absorption wavelength range and simultaneously promote the transfer and spatial separation of carriers,leading to enhanced photocatalytic activity and stability.Herein,the carrier transfer pathways and photocatalytic mechanism of various semiconductor heterojunctions(TypeⅡ,Z-scheme and S-scheme)were summarized.The application of ZnS/ZnO heterojunctions in the degradation of organic pollutants,aquatic hydrogen decomposition and CO_(2) reduction were reviewed,followed by summarization on their influencing factors and improving strategies of photocatalytic performance.Finally,the existing problems and future development directions of ZnS/ZnO heterojunction catalysts were discussed.