Peroxydisulfate activation by positively polarized carbocatalyst for enhanced removal of aqueous organic pollutants

Nie, Chunyang; Dai, Zhenhua; Meng, Hong; Duan, Xiaoguang; Qin, Yanlin; Zhou, Yanbo; Ao, Zhimin; Wang, Shaobin

doi:10.1016/j.watres.2019.115043

Cited by 150 publications

(40 citation statements)

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“…It can be observed that the charge variation of uc-TM atoms of TM S2 is smooth, while the variation is relatively drastic for uc-TM atoms of DV-TMDs. As known, charge variation is the result of electron transfer, [42] [22] The low oxidation state of uc-TM atoms in TM S2 should be related to the e-TM atoms. The Hirshifeld analysis shows that Q = 0.29 for e-Mo atom and 0.22 for e-W atom, larger than the Q values of uc-TM atoms.…”

Section: Resultsmentioning

confidence: 99%

“…It can be observed that the charge variation of uc‐TM atoms of TM S2 is smooth, while the variation is relatively drastic for uc‐TM atoms of DV‐TMDs. As known, charge variation is the result of electron transfer, [42] and low Φ value means good ability of electron transfer. The calculation shows that Φ= 5.55 and 5.99 eV for Mo S2 and DV‐Mo S2 , respectively, and the Φ value of W S2 is also smaller than that of DV‐WS 2 .…”

Section: Resultsmentioning

confidence: 99%

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Steric Hindrance‐ and Work Function‐Promoted High Performance for Electrochemical CO Methanation on Antisite Defects of MoS₂ and WS₂

et al. 2021

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CO methanation from electrochemical CO reduction reaction (CORR) is significant for sustainable environment and energy, but electrocatalysts with excellent selectivity and activity are still lacking. Selectivity is sensitive to the structure of active sites, and activity can be tailored by work function. Moreover, intrinsic active sites usually possess relatively high concentration compared to artificial ones. Here, antisite defects Mo S2 and W S2 , intrinsic atomic defects of MoS 2 and WS 2 with a transition metal atom substituting a S 2 column, were investigated for CORR by density functional theory calculations. The steric hindrance from the special bowl structure of Mo S2 and W S2 ensured good selectivity towards CO methanation. Coordination environment variation of the active sites, the undercoordinated Mo or W atoms, effectively lowered the work function, making Mo S2 and W S2 highly active for CO methanation with the required potential of À 0.47 and À 0.49 V vs. reversible hydrogen electrode, respectively. Moreover, high concentration of active sites and minimal structural deformation during the catalytic process of Mo S2 and W S2 enhanced their attraction for future commercial application.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Steric Hindrance‐ and Work Function‐Promoted High Performance for Electrochemical CO Methanation on Antisite Defects of MoS₂ and WS₂

et al. 2021

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“…Various reactive oxygen species (ROS), for example, sulfate (SO 4 •– ), hydroxyl ( • OH) and superoxide (O 2 •– ) radicals, singlet oxygen ( 1 O 2 ), and carbon-activated persulfate complexes, could be formed via PMS activation by heat, ultrasound, ultraviolet light, alkaline matter, or catalysts. − Besides the traditional activation methods, novel routes such as light to heat and piezoelectric techniques were also employed for PMS activation. , Among the activation methods, catalytic activation integrates the advantages of mild operation conditions, no extra energy input, and easy recycling of catalysts and exhibits outstanding application potential . Typically, metal- and carbon-based materials were common catalysts to initiate PMS activation. − …”

Section: Introductionmentioning

confidence: 99%

Correlation of Active Sites to Generated Reactive Species and Degradation Routes of Organics in Peroxymonosulfate Activation by Co-Loaded Carbon

Duan

et al. 2021

Environ. Sci. Technol.

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Peroxymonosulfate (PMS)-based advanced oxidation processes (PMS-AOPs) as an efficient strategy for organic degradation are highly dependent on catalyst design and structured active sites. However, the identification of the active sites and their relationship with reaction mechanisms for organic degradation are not fully understood for a composite catalyst due to the complex structure. Herein, we developed a family of Co encapsulated in Ndoped carbons (Co-PCN) with tailored types and contents of active sites via manipulated pyrolysis for PMS activation and ciprofloxacin (CIP) degradation, focusing on the correlation of active sites to generated reactive species and degradation routes of organics. The structure−function relationships between the different active sites in Co-PCN catalysts and reactive oxygen species (ROS), as well as bond breaking position of CIP, were revealed through regression analysis and density functional theory calculation. Co−N x , O−CO, CO, graphitic N, and defects in Co-PCN stimulate the generation of 1 O 2 for oxidizing the C−C bond in the piperazine ring of CIP into CO. The substitution of F by OH and hydroxylation of the piperazine ring might be induced by SO 4•− and • OH, whose formation was affected by C−O, Co(0), Co−N x , graphitic N, and defects. The findings provided new insights into reaction mechanisms in PMS-AOP systems and rational design of catalysts for ROS-oriented degradation of pollutants.

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“…Although a small fraction of pollutants is present in aquatic environments, most of them bio-accumulate and resist traditional physical removal methods [1]. Consequently, innovative strategies, such as advanced oxidation processes (AOPs), have been introduced; the Fenton reaction, which was discovered in 1894, is one of the most studied strategies [2][3][4][5][6][7][8][9][10]. The main reactions stated below [Eqs.…”

Section: Introductionmentioning

confidence: 99%

Graphene-Based Photo-Fenton Catalysts for Pollutant Control

Bao

Yan

et al. 2021

Trans. Tianjin Univ.

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Water pollution is a global environmental issue with multi-dimensional influences on human life. Some strategies, such as photo-Fenton reaction, have been employed to remove recalcitrant pollutants. Two-dimensional (2D) graphene and its three-dimensional (3D) configurations have attracted considerable attention as emerging carbon-based catalysts in photo-Fenton fields owing to their alluring properties in electron transfer, reactant adsorption, and light response. This review summarizes the recent developments in 2D and 3D graphene-based catalysts for photo-Fenton reactions. Their structures, characteristics, activity, and mechanisms are discussed. The conclusions and outlooks are proposed for the profound understanding of challenges and future directions.

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Peroxydisulfate activation by positively polarized carbocatalyst for enhanced removal of aqueous organic pollutants

Cited by 150 publications

References 50 publications

Steric Hindrance‐ and Work Function‐Promoted High Performance for Electrochemical CO Methanation on Antisite Defects of MoS₂ and WS₂

Steric Hindrance‐ and Work Function‐Promoted High Performance for Electrochemical CO Methanation on Antisite Defects of MoS₂ and WS₂

Correlation of Active Sites to Generated Reactive Species and Degradation Routes of Organics in Peroxymonosulfate Activation by Co-Loaded Carbon

Graphene-Based Photo-Fenton Catalysts for Pollutant Control

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Peroxydisulfate activation by positively polarized carbocatalyst for enhanced removal of aqueous organic pollutants

Cited by 150 publications

References 50 publications

Steric Hindrance‐ and Work Function‐Promoted High Performance for Electrochemical CO Methanation on Antisite Defects of MoS2 and WS2

Steric Hindrance‐ and Work Function‐Promoted High Performance for Electrochemical CO Methanation on Antisite Defects of MoS2 and WS2

Correlation of Active Sites to Generated Reactive Species and Degradation Routes of Organics in Peroxymonosulfate Activation by Co-Loaded Carbon

Graphene-Based Photo-Fenton Catalysts for Pollutant Control

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Product

Resources

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Steric Hindrance‐ and Work Function‐Promoted High Performance for Electrochemical CO Methanation on Antisite Defects of MoS₂ and WS₂

Steric Hindrance‐ and Work Function‐Promoted High Performance for Electrochemical CO Methanation on Antisite Defects of MoS₂ and WS₂