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Doping polymetals on Fe-based catalysts is proved to be an effective way to improve the performance on activating persulfate. In this paper, a highly efficient persulfate activation catalyst (FeCo@MoS2) was successfully synthesized by introducing MoS2 onto the surface of FeCo nanoboxes. During the activation of PMS the introduced of MoS2 effectively promoted the formation of free radicals (center dot OH, SO4 center dot), O-1(2) and Fe(IV). Due to the synergistic effects between Mo and Fe, FeCo@MoS2 has better catalytic activity (2.01 times larger of defluorination efficiency and 3.91 times larger of the apparent rate constant (k(obs))) than FeCo. Under the optimal conditions (catalyst dosage of 0.2 g L-1, PMS dosage of 1.0 g L-1 and initial pH 4.0), the perfluorooctanoic acid (PFOA, 10 mg L-1) could be degraded in 60 min, with 90.26 +/- 2.64% of the defluorination efficiency. The LCMS results showed that under the attack of free radicals (center dot OH, SO4 center dot), O-1(2) and Fe(IV), the PFOA underwent stepby-step defluorination process. In addition, the ECOSAR results showed that during the whole degradation of PFOA in FeCo@MoS2/PMS system, no highly toxic intermediates was accumulated, suggesting a green degradation process. This work showed new ideas and strategies for studying the influence of polymetallic doping on the catalytic process of PMS multiphase catalytic system.
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JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
ISSN: 2213-2929
Year: 2023
Issue: 2
Volume: 11
7 . 4
JCR@2023
7 . 4 0 0
JCR@2023
ESI Discipline: ENGINEERING;
ESI HC Threshold:35
JCR Journal Grade:1
CAS Journal Grade:2
Cited Count:
WoS CC Cited Count: 9
SCOPUS Cited Count: 9
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 4
Affiliated Colleges: