1. Encapsulating Fe-Co bimetal inside carbon aerogel to boost electron transfer for efficient heterogeneous electro-peroxone oxidation of organic pollutants.
- Author
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Xie, Jinxin, Fu, Wenyang, Wu, Huizhong, Zheng, Yang, Li, Shasha, Gu, Jinyu, Zhang, Hanyue, and Zhou, Minghua
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CHARGE exchange , *LAMINATED metals , *POLLUTANTS , *AEROGELS , *INTERFACIAL reactions - Abstract
[Display omitted] • The metal–oxygen-carbon bonds boosted interfacial electron transfer. • Ozone utilization efficiency was higher (ΔTOC/ΔO 3 = 1.23–0.68) in Fe 2 Co@CS/EP compared with EP. • Catalytic ozonation played the dominant role in · OH, · O 2 − and 1O 2 generation. • Fe 2 Co@CS/EP presented an enormous potential in wastewater treatment. We fabricated a novel Fe-Co bimetal encapsulated inside carbon aerogel sphere (Fe 2 Co@CS) to improve the electro-peroxone (EP) process. The degradation and mineralization of p -nitrophenol (p -NP) were 100% (15 min) with rate constant of 0.314 min−1 and 83.8% (60 min) in Fe 2 Co@CS/EP, respectively. Fe 2 Co@CS was composed of defective graphite carbon and Fe 2 Co alloy. The presence of metal–oxygen-carbon (M-O-C, M Fe/Co) bonds promoted interface electron transfer from carbon layer towards Fe 2 Co alloy, which was advantageous to the reduction of ≡Fe3+/≡Co3+. Moreover, the Fe-Co synergistic effect also accelerated the interfacial catalytic reaction for activating O 3 and H 2 O 2. The quenching experiment and EPR test indicated that · OH, · O 2 - and 1O 2 were main reactive oxygen species (ROSs). DFT calculations showed that O 3 had lower adsorption energy on Fe 2 Co@CS than H 2 O 2 , manifesting that catalytic ozonation played the key role in ROSs generation. In addition, ozone utilization efficiency in Fe 2 Co@CS/EP (ΔTOC/ΔO 3 = 1.23–0.68) revealed 66-36% increase relative to those of EP (0.74–0.5). Fe 2 Co@CS was an efficient catalyst over a wide pH range (3–11) with permissible iron and cobalt releases. The Fe 2 Co@CS/EP process exhibited high-performance for degrading different pollutants under high salinity condition with coexistence of Cl−, NO 3 − and SO 4 2−. For treating real coal wastewater, the TOC removal was 52.7% at 4 h with low EEC (0.038 kWh (g TOC)−1). This study provided an efficient method for the development of EP in wastewater treatment. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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