WS2-cocatalyzed peroxymonosulfate activation via an enhanced Fe(III)/Fe(II) cycle toward efficient organic pollutant degradation

Chen, Yundan; Shao, Yan; Li, Ouyang; Liang, Jiaming; Tang, Siqi; Zhen-shan, LI

doi:10.1016/j.cej.2022.135961

Cited by 50 publications

(4 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A similar result was obtained in the XPS analysis of WS 2 before and after the reaction (Figure S9b). The W 4f spectra of WS 2 could be deconvoluted into four components . The two characteristic peaks at 33.0 and 35.2 eV were, respectively, assigned to W(IV) in the orbitals of W 4f7/2 and W 4f5/2, and another two peaks at 35.8 and 38.5 eV were designated as W(VI) in the orbitals of W 4f7/2 and W 4f5/2, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The W 4f spectra of WS 2 could be deconvoluted into four components. 42 The two characteristic peaks at 33.0 and 35.2 eV were, respectively, assigned to W(IV) in the orbitals of W 4f7/2 and W 4f5/2, and another two peaks at 35.8 and 38.5 eV were designated as W(VI) in the orbitals of W 4f7/2 and W 4f5/2, respectively. The W(IV)/W(VI) atomic ratio of raw WS 2 was 4.15 according to the calculation with the peak areas of W 4f, indicating that W(IV) and W(VI) accounted for 80.6 and 19.4%, respectively.…”

Section: Identification Of the Dominantmentioning

confidence: 99%

See 1 more Smart Citation

Efficient Degradation of Organic Contaminants by Activated Permanganate with Metal Sulfides: In Situ Generation of Mn(III)

Tian,

Ma,

et al. 2024

ACS EST Eng.

View full text Add to dashboard Cite

KMnO 4 activation processes have drawn increasing attention in water decontamination due to the massive generation of highly reactive Mn species. This study surprisingly found that metal sulfides such as molybdenum sulfide (MoS 2 ) and tungsten sulfide (WS 2 ) remarkably enhanced the oxidation of various trace organic contaminants (TrOCs, including antibiotics, pharmaceuticals, and pesticides) by KMnO 4 , with the degradation efficiency increasing to 24.6 ∼ 100% and 17.2 ∼ 100%, respectively. Probe compound oxidation experiments, Mn average valence determination, and UV absorbance spectral analyses suggested that Mn(III) species was the only reactive intermediate in situ formed and responsible for the enhanced contaminant oxidation. KMnO 4 activation with metal sulfides was mainly attributed to reducing S(−II) species, which served as the electron sacrificer for the conversion of MnO 4 − to Mn(III). The KMnO 4 /metal sulfide process exhibited a desirable removal of TrOCs in actual water. Significant degradation of sulfamethoxazole by KMnO 4 /MoS 2 and KMnO 4 /WS 2 was observed in a wide pH range from 3.0 to 9.0. HCO 3 − at a low concentration could enhance the oxidation efficiency, and humic acid (HA) simply showed a small negative impact. Importantly, metal ions leached after KMnO 4 /MoS 2 and KMnO 4 /WS 2 oxidation could be removed by the subsequent coagulation process. The results demonstrated that the KMnO 4 /metal sulfides process may be an alternative Mn(III)driven oxidation technology to remove organic contaminants for water remediation.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Identification Of the Dominantmentioning

confidence: 99%

Efficient Degradation of Organic Contaminants by Activated Permanganate with Metal Sulfides: In Situ Generation of Mn(III)

Tian,

Ma,

et al. 2024

ACS EST Eng.

View full text Add to dashboard Cite

show abstract

“…It has been established that high f – values are indicative of electrophilic reactions, ,,− while high f + values suggest nucleophilic reactions. , High f 0 values are susceptible to attack by free radicals. Among the AOPs, free radicals are considered to be the most important active substances; therefore, f 0 is widely utilized. ,,,,,,− ,,,,,,− It is noteworthy that f 0 considers both the electrophilic and nucleophilic properties of the radical. However, when the radical exhibits predominantly electrophilic properties in a reaction, f – may be more appropriate for predicting the reaction site.…”

Section: Reactive Active Site Prediction Based On Target Molecule Pro...mentioning

confidence: 99%

“…Advanced oxidation processes (AOPs), including ozonation, , Fenton/Fenton-like reactions, , photocatalysis, , and sulfate-radical-based AOPs (SR-AOPs), , are widely recognized as the most effective technologies for removing refractory organic pollutants. The core of the traditional advanced oxidation theory system lies in free radicals.…”

Section: Introductionmentioning

confidence: 99%

DFT Calculation of Nonperiodic Small Molecular Systems to Predict the Reaction Mechanism of Advanced Oxidation Processes: Challenges and Perspectives

et al. 2023

View full text Add to dashboard Cite

Advanced oxidation processes (AOPs) have a broad range of potential applications in the treatment of emerging refractory emerging pollutants. However, due to the presence of highly reactive substances such as free radicals that are difficult to capture, it is challenging to investigate the mechanism of AOPs at the elementary reaction level. The conventional methods, such as electron spin resonance (ESR), free radical quantification, and free radical quenching, are plagued by systematic issues that have led to bottlenecks in the field of AOP studies. The development of computational chemistry theory and computer performance provides a new method to study the mechanism of AOPs through density functional theory (DFT) calculation. Due to its excellent cost–performance benefit, DFT calculations for aperiodic small molecules have become popular in the field of AOPs. In this paper, a comprehensive review is presented on the applications of DFT calculations for predicting active sites and exploring reaction selectivity and oxidant activation mechanisms. A systematic classification of methods related to molecular descriptors and transition states is provided. Furthermore, some current research issues are identified, and future development prospects and challenges are discussed.

show abstract

Bimetallic Ni/Fe Atom Cluster Catalysts Enhance Non-free Radical Degradation of Organic Pollutant Phenol

Liu,

Song,

Liu

et al. 2023

Catal Lett

View full text Add to dashboard Cite

WS2-cocatalyzed peroxymonosulfate activation via an enhanced Fe(III)/Fe(II) cycle toward efficient organic pollutant degradation

Cited by 50 publications

References 67 publications

Efficient Degradation of Organic Contaminants by Activated Permanganate with Metal Sulfides: In Situ Generation of Mn(III)

Efficient Degradation of Organic Contaminants by Activated Permanganate with Metal Sulfides: In Situ Generation of Mn(III)

DFT Calculation of Nonperiodic Small Molecular Systems to Predict the Reaction Mechanism of Advanced Oxidation Processes: Challenges and Perspectives

Bimetallic Ni/Fe Atom Cluster Catalysts Enhance Non-free Radical Degradation of Organic Pollutant Phenol

Contact Info

Product

Resources

About