期刊
CHEMICAL ENGINEERING JOURNAL
卷 426, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.130850
关键词
Peroxymonosulfate; Metallic oxides-carbon catalyst; Radical and non-radical; Electron transfer; Built-in electric field
资金
- Key R AMP
- D project of Hunan province [2018SK2048]
- National Natural Science Founda-tion of China [51541801, 51521006]
In this study, CuFe2O4 nanoparticles anchored on nitrogen-doped carbon nanosheets were prepared to investigate the electron transfer for radical and non-radical pathway activation. The results indicate that a built-in electric field (BIEF) plays a crucial role in adjusting the electron transfer. Under the dominance of BIEF, the CFONC-2/PMS system showed excellent removal performance of levofloxacin (LVFX), suggesting a promising strategy for designing metallic oxides-carbon catalyst with strong electric field effect in PMS catalytic reaction.
Radical and non-radical dominated PMS activation has been widely researched, but the driving force of this process is not well understood. Herein, CuFe2O4 nanoparticles anchored on nitrogen-doped carbon nanosheets (CFONC-2) was prepared for investigation. Experimental results and DFT calculations indicate that a built-in electric field (BIEF) is formed between CuFe2O4 and N-doped carbon nanosheets, which is proposed as the driving force to adjust the electron transfer for triggering radical and non-radical pathway. Specifically, Cu+/ Cu2+ and Fe2+/Fe3+ redox cycles are regarded to be the dominant catalytic sites for radical generation (SO4 center dot-, HO center dot and center dot O2-). Whereas graphitic N, sp2-hybridized structure, as well as C = O functional group are main active sites for non-radical production (1O2 and direct electron transfer process). Under the radical and non-radical processes dominated by BIEF, the CFONC-2/PMS system exhibits excellent removal performance of levofloxacin (LVFX), where 84.87% of LVFX is removed in 90 min. This work offers a feasible strategy for designing metallic oxides-carbon catalyst with strong electric field effect to satisfy the charge transfer in PMS catalytic reaction.
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