1
|
Guo L, Liu YL, Zeng Q, Zhang C, Wen Y, Zhang Q, Tang G, Zhang Q, Zeng Q. A self-driven solar coupling system with TiO 2@MXene cathode for effectively eliminating uranium and organics from complex wastewater accompanying with electricity generation. JOURNAL OF HAZARDOUS MATERIALS 2024; 465:133415. [PMID: 38185087 DOI: 10.1016/j.jhazmat.2023.133415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 12/16/2023] [Accepted: 12/29/2023] [Indexed: 01/09/2024]
Abstract
The inevitable organic matters in radioactive wastewater and contaminated waters pose great challenge in uranium recycling by traditional techniques. Here, a self-driven solar coupling system (SSCS), which was assembled by a TiO2 @MXene/CF cathode and a monolithic photoanode, was proposed for synergistically recycling uranium and degrading organics from complex radioactive wastewater, combining with electricity production. The TiO2 @MXene/CF was prepared via a simple annealing process with in-situ derived TiO2 nanoparticles decorated Ti3C2 MXene coated on carbon felt (CF). Under sunlight illumination, the photoanode captured electrons of organics, and drove electrons to the TiO2 @MXene/CF, which exhibited an exceptional UO22+ adsorption and reduction capacity because TiO2 nanoparticles provided plenty of surface hydroxyl groups for UO22+ adsorption, and the unique two-dimensional MXene facilitated the charge transfer. The SSCS with TiO2 @MXene/CF removed almost 100% UO22+ and organics with rate constants of ∼21 and ∼6.9 times those of the system with CF, accompanying with excellent power output (∼1000 μW·cm-2). The fixed uranium on TiO2 @MXene/CF was effectively reduced into insoluble UO2 (91.1%), and no obvious decay was observed after 15 repeated uses. This study proposes a multi-functional and easy-operated way for remediating radioactive wastewater and contaminated waters, and gives valuable insights in designing cathode materials for uranium reduction.
Collapse
Affiliation(s)
- Lulin Guo
- School of Resources & Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, China
| | - Yi-Lin Liu
- School of Resources & Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, China; School of Mechanical Engineering, University of South China, Hengyang, Hunan 421001, China.
| | - Qingming Zeng
- School of Resources & Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, China
| | - Chao Zhang
- School of Resources & Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, China
| | - Yanjun Wen
- School of Resources & Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, China
| | - Qingyan Zhang
- School of Resources & Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, China
| | - Guolong Tang
- School of Resources & Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, China; School of Mechanical and Electrical Engineering, Qingdao Qiushi College, Qingdao, Shandong 266108, China
| | - Qingsong Zhang
- School of Resources & Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, China
| | - Qingyi Zeng
- School of Resources & Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, China.
| |
Collapse
|