The synergy of sulfur vacancies and heterostructure on CoS@FeS nanosheets for boosting the peroxymonosulfate activation

MoS2 Nanosheets Anchored onto MIL-100(Fe)-Derived FeS2 as a Peroxymonosulfate Activator for Efficient Sulfamethoxazole Degradation: Insights into the Mechanism

“…Three possible degradation routes are illustrated in Figure . In route I, SMX was attacked by 1 O 2 to form hydroxylated SMX (P1), the methyl group of which was further oxidized to the carboxyl group to yield P2, followed by the production of P3 and P4 . In route II, SMX underwent the oxidation of the aniline group to generate nitro-SMX (P5), followed by the reaction of hydroxylation (C13) and isoxazole ring opening to generate P6 and P7, respectively .…”

“…Additionally, compared to pure FeS 2 and MoS 2 , the as-synthesized FeS 2 @MoS 2 -2 with more electron-deficient SVs possessed stronger affinity toward PMS molecules, which could facilitate the redox cycle of Fe­(III)/Fe­(II) and lead to more yield of • OH, SO 4 •– , and Fe IV = O. , Additionally, the dissolved O 2 can be adsorbed on SVs to accept an electron from SVs to generate O 2 •– …”

“…•− , and Fe IV = O. 58,59 Additionally, the dissolved O 2 can be adsorbed on SVs to accept an electron from SVs to generate O 2…”

Sulfur vacancies on MoS2 enhanced the activation of peroxymonosulfate through the co-existence of radical and non-radical pathways to degrade organic pollutants in wastewater

“…The activation of PMS by heterogeneous catalysts containing defect sites has attracted much attention in the past few years. [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] Among them, the oxygen vacancies are the most studied, 16,[18][19][20][21][22][23][24][25] which oen appear in various catalysts containing oxygen, including pure metal oxides such as Co 3 O 4 16 and ZnO, 19 perovskite 20 and composited compounds. [21][22][23] For example, Zhao et al 16 reported the role of oxygen vacancies in different Co 3 O 4 crystal planes for the activation of PMS by the formation of 1 O 2 ; Gao et al 20 demonstrated the correlation between oxygen-decient sites in the perovskite and the formation of 1 O 2 in activated PMS.…”

“…Sulfur vacancies used for activating PMS have attracted great attention in recent years. [26][27][28][29][30][31] This case is common in transition metal suldes. Compared to oxygen and nitrogen vacancies, sulfur vacancies possess more advantages, as it is not only that the valence-changing transition metal ions are usually good activators for PMS but also that the sulfur defect sites themselves can activate both PMS and metal ions.…”