Han Bing, Bi Renke, Zhou Chutong, Liu Zhe, Lou Yunchao, Wang Zhiyu
State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
Environ Sci Pollut Res Int. 2022 Dec;29(56):85095-85102. doi: 10.1007/s11356-022-21808-4. Epub 2022 Jul 6.
CeF-O with intermediate band showed improved synergic photodegradation activity toward HCl-TC and RhB under NIR light irradiation when enhanced by Ag as a cocatalyst. Ag ions take electrons from the second transition in CeF-O's intermediate band, which are then reduced to Ag as cocatalyst. The photodegradation efficiencies of HCl-TC by various Ag/CeF-O nanoparticles in 180-min increase from 26.5 to 73.1%. The optimal Ag/CeF-O-100 is about 2.76 times that of pure CeF-O. Ag/CeF-O-100 has an apparent rate constant of 4.5 × 10 min, which is 3.0 times that of pure CeF-O. Similarly, Ag/CeF-O-10 achieves a superior photodegradation efficiency of RhB at 96.7% under NIR light within 120 min. Its apparent rate constant of 27.7 × 10 min is 12.0 times that of pure CeF-O (2.3 × 10 min). Further, the turnover frequencies of Ag/CeF-O nanoparticles are greatly higher than that of the corresponding pure CeF-O nanoparticles. Ag-enhanced CeF-O has a unique metal-semiconductor interface where Ag acts as a bridge for facilitating charge transfer and the separation efficiency of photogenerated carries. The synergic effect between CeF-O and Ag provides a practical technique for enhancing the wastewater treatment with NIR light irradiation.
具有中间带的CeF-O在作为助催化剂的Ag增强下，在近红外光照射下对HCl-TC和RhB表现出改善的协同光降解活性。Ag离子从CeF-O中间带的第二次跃迁中获取电子，然后这些电子被还原为作为助催化剂的Ag。各种Ag/CeF-O纳米颗粒在180分钟内对HCl-TC的光降解效率从26.5%提高到73.1%。最佳的Ag/CeF-O-100约为纯CeF-O的2.76倍。Ag/CeF-O-100的表观速率常数为4.5×10⁻³ min⁻¹，是纯CeF-O的3.0倍。同样，Ag/CeF-O-10在近红外光下120分钟内对RhB的光降解效率达到96.7%。其表观速率常数为27.7×10⁻³ min⁻¹，是纯CeF-O（2.3×10⁻³ min⁻¹）的12.0倍。此外，Ag/CeF-O纳米颗粒的周转频率大大高于相应的纯CeF-O纳米颗粒。Ag增强的CeF-O具有独特的金属-半导体界面，其中Ag作为促进电荷转移和光生载流子分离效率的桥梁。CeF-O和Ag之间的协同效应为利用近红外光照射增强废水处理提供了一种实用技术。
