ZnO基纳米光催化剂的研究进展  

Research Progress on ZnO Based Nano-photocatalysts

作　　者：洪春水 杨雷[2] 祝文才 Hong Chunshui;Yang Lei;Zhu Wencai(Yongzhou Xiangjiang Rare Earths Co.,Ltd.,Yongzhou 426111,China;College of Materials Science and Engineering,Hunan University,Changsha 410082,China;Ganzhou Zhanhai New Material Technology Co.,Ltd.,Ganzhou 341000,China)

机构地区：[1]永州市湘江稀土有限责任公司,湖南永州426111 [2]湖南大学材料科学与工程学院,湖南长沙410082 [3]赣州湛海新材料科技有限公司,江西赣州341000

出　　处：《广东化工》2024年第14期62-65,共4页Guangdong Chemical Industry

基　　金：长沙市科技计划(kq2004023)。

摘　　要：当光子能量大于或等于半导体材料的禁带宽度时,电子吸收光子能量,跃迁到导带上,同时在价带留下空穴,此时部分电子和空穴迁移到催化剂的表面,与氧气或水反应生成自由基,与污染物进行氧化还原反应,从而把污染物降解。常见的光催化材料是ZnO和稀土掺杂ZnO纳米材料,常见的制备方法有沉淀法,水热,溶胶凝胶等方法。稀土离子的引入,会在ZnO的带隙中形成大量缺陷能级和杂质能级,这些能级的存在,有利于多光子过程,促使ZnO晶格对可见光的吸收,也促进了电子空穴的分离,促进光催化能力的提高。When the photon energy is greater than or equal to the band gap width of the semiconductor material,the electrons absorb the photon energy,jump to the conduction band,and leave holes in the valence band.At this time,part of the electrons and holes migrate to the surface of the catalyst,react with oxygen or water to generate free radicals,and conduct redox reaction with pollutants,thus degrading pollutants.The common photocatalytic materials are ZnO and rare-earth doped ZnO nanomaterials.The common preparation methods include precipitation,hydrothermal,sol-gel and so on.The introduction of rare earth ions will form a large number of defect levels and impurity levels in the band gap of ZnO.The existence of these levels promotes the multi-photon process,which promotes the absorption of visible light by the ZnO lattice,promotes the separation of electron holes,and promotes the improvement of photocatalytic ability.

关 键 词：氧化锌 光催化剂 稀土掺杂 电荷分离 催化效率 

分 类 号：TQ[化学工程]