期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 297, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2022.121428
关键词
MXene; Cu(II)/PMS; Cu(III); Cu(I); Strong metal-support interaction
资金
- National Natural Science Foundation of China [52100077, 52070042]
- Basic and Applied Basic Research Foundation of Guangdong Province [2019A1515110862, 2020A1515410002]
There is an obvious contradiction between Cu(III) generation and Cu(I) contribution in the reductant-enhanced Cu(II)/peroxymonosulfate (PMS) process. This study investigates the MXene-mediated electron transfer mechanism in Cu(II)/PMS for the first time and proposes a novel understanding of the Cu(III)/Cu(I) transformation pathway.
There exists an obvious contradiction between Cu(III) generation and Cu(I) contribution in reductants enhanced Cu(II)/peroxymonosulfate (PMS) process because the involved electron transfer pathways were always ignored in previous studies. This study investigated the MXene-mediated electron transfer mechanism in Cu(II)/PMS for the first time. The introduction of MXene significantly promoted atrazine degradation under acidic condition because the in-situ generation of Cu(I) was an excellent activator for PMS. Under alkaline condition, although addition of MXene generated a large amount of Cu(I), the degradation of atrazine was inhibited due to that the conversion of Cu(I) to Cu(III) was interrupted. The strong metal-support interaction (SMSI) altered the reactive intermediate species from Cu(III) (two-electron transfer) to hydroxyl radical (HO center dot) and sulfate radical (SO4 center dot-) (one-electron transfer) under alkaline condition. This work proposed a novel MXene-mediated electron transfer mechanism and improved the understanding of Cu(III)/Cu(I) transformation pathway.
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