High-performance iron-doped molybdenum disulfide photocatalysts enhance peroxymonosulfate activation for water decontamination

Toward Practical Water Decontaminations via Peroxymonosulfate Nonradical Oxidation: The Role of Cocatalyst MoS2 with Sulfur Vacancies

“…The fully scanned spectra of F-M-3 corroborated that its main constituent elements are Fe, O, Mo, and S (Figure S3), which is in good agreement with the findings of Raman spectra and XRD patterns. The high-resolution Mo 3d XPS spectrum of F-M-3 can be deconvoluted into six peaks (Figure a), a distinct doublet located at binding energies of 228.9 and 232.1 eV corresponding to Mo IV , another doublet located at 233.2 and 235.5 eV corresponding to Mo VI , a peak at 226.2 eV representing S 2s, and a minor peak at 230.0 eV ascribed to Mo V . We note that the binding energy of Mo shifts to its lower value with the augmentation of Fe 3 O 4 , suggesting a higher charge density of Mo in the composite …”

“…Active species including radicals, oxidants, and oxygen-contained species were scrutinized throughout the F-M-X/PMS system using a scavenging trial . The reaction rate constants of scavengers used for different active species are listed in Table S3.…”

“…Besides, we also examined the exhibition of oxygen-contained active species super oxygen (O 2 •– ) and singlet oxygen ( 1 O 2 ) in the F-M-3/PMS system for pollutant degradation (Figure d,e). The inhibition effect on the degradation of pollutants with the addition of l -his and furfuryl alcohol (FFA) was much larger than that of the rest, indicating that the monoclinic oxygen in the system might be critical to the removal of pollutants . Moreover, the addition of F-M-3 significantly intensified the signal of the triplet  TEMP– 1 O 2 adduct, demonstrating the positive relation of 1 O 2 in the F-M-3/PMS system to the removal of pollutants .…”

Unraveling the Synergy Mechanism between Photocatalysis and Peroxymonosulfate Activation on a Co/Fe Bimetal-Doped Carbon Nitride

“…Graphitic carbon nitride (g-C 3 N 4 ), a conjugated polymer with semiconductor properties that can be excited by visible light, has shown great application potential in various environmental and energy catalysis fields. − In addition, the N elements with lone pairs of electrons on g-C 3 N 4 can easily coordinate with metal elements to form M–N x structures, thus forming stable atomically dispersed metal active sites and inhibiting the loss of metal elements. − Therefore, g-C 3 N 4 is an ideal support and platform for the fabrication and study of photo-Fenton-like catalysts. − Yet, due to the limited performance of traditional catalysts, various strategies have been applied to construct an efficient photo-Fenton-like catalyst, including constructing heterojunction, − doping, defect engineering, and so on. However, all of the reported works indicated that the degradation efficiency of pollutants was higher when photocatalysis and Fenton-like catalysis were employed simultaneously.…”

“…9−11 Therefore, g-C 3 N 4 is an ideal support and platform for the fabrication and study of photo-Fenton-like catalysts. 12−15 Yet, due to the limited performance of traditional catalysts, various strategies have been applied to construct an efficient photo-Fenton-like catalyst, including constructing heterojunction, 16−18 doping, 19 defect engineering, 20 and so on. However, all of the reported works indicated that the degradation efficiency of pollutants was higher when photocatalysis and Fenton-like catalysis were employed simultaneously.…”