Single atom Mn anchored on N-doped porous carbon derived from spirulina for catalyzed peroxymonosulfate to degradation of emerging organic pollutants

Zhou, Chengyun; Liang, Yuntao; Wu, Xue-Bing; Almatrafi, Eydhah; Song, Biao; Wang, Ziwei; Zeng, Yuxi; Yang, Yang; Shang, Yanan; Wang, Chaohai; Zeng, Guangming

doi:10.1016/j.jhazmat.2022.129871

Cited by 117 publications

(24 citation statements)

References 52 publications

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“…The N 1s spectrum of the nanozymes has five peaks , (Figure c), which correspond to pyridine N peak (398.3 eV), pyrrole N peak (400.2 eV), graphene N peak (401.3 eV), pyridine N + –O – peak (403.6 eV) and Mn–N peak (399.2 eV). Figure d shows the Mn 2p spectrum, and its Mn 2p 3/2 peak is located in 642.2 eV, corresponding to 641.2 and 642.9 eV of Mn(II) 2p 3/2 and Mn(III) 2p 3/2 , respectively, indicating that the valence state of Mn in the nanozymes may be a mixed valence state, and it can be seen from the spectrum that it is more biased toward Mn 3+ . The C 1s spectrum of the nanozymes has four peaks (Figure S9), which correspond to the graphite carbon peak CC (284.8 eV), C–N peak (288.3 eV), C–P peak (285.6 eV), and C–S peak (284.5 eV), respectively.…”

Section: Resultsmentioning

confidence: 99%

Single-Atom Nanozyme Based on Mn-Center with Enhanced Peroxidase-like Activity for Organic Dye Degradation

Feng

Wang

Xue

et al. 2023

ACS Appl. Nano Mater.

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Compared with natural enzymes, nanozymes have advantages such as high stability, low cost, and a broad application prospect. However, due to the low catalytic activity of conventional nanozymes, synthesizing nanozymes with excellent enzyme-like activity will be long-term work. Herein, we synthesized single-atom nanozymes centered on Mn with N, P, and S doped (Mn-SAzyme) with enhanced peroxidase-like (POD-like) activity. We found that the presence of the Mn metal center significantly increased the POD-like activity of the nanozyme, exhibiting catalytic properties consistent with Michaelis–Menten kinetics. The POD-like activity was measured to be 17.48 U/mg, which was higher than that of the sample without the metal center. Using methylene blue (MB) as the organic dye model, the degradation efficiency of Mn-SAzyme could reach 90.1% within 300 min at pH 6.5, within the H2O2 concentration of 0.1 M and 25 mg/L of nanozyme dosage. Free radical quenching experiments and electron paramagnetic resonance tests showed that •O2 – and •OH were the key to degrading organic dyes. This work aims to explore more methods for synthesizing highly active nanozymes and successfully applying the synthesized nanozymes to the degradation of organic dyes.

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Section: Resultsmentioning

confidence: 99%

Single-Atom Nanozyme Based on Mn-Center with Enhanced Peroxidase-like Activity for Organic Dye Degradation

Feng

Wang

Xue

et al. 2023

ACS Appl. Nano Mater.

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“…[84,105,106] During the ball milling process, some covalent/coordination bonds of the support will be broken, thus forming defect sites for capturing the cocatalysts. [55,107] Importantly, the high-energy ball milling method can be extended to the large-scale production of most noble and transition metal SACs. [108][109][110][111] Gan et al have used the ball milling method to achieve the production of kilogramlevel Au 1 /CeO 2 SACs, providing certain insights into the industrial application of SACs.…”

Section: Ball Milling Methodsmentioning

confidence: 99%

Recent Progress of Single‐Atom Photocatalysts Applied in Energy Conversion and Environmental Protection

Pan

Zhang

et al. 2023

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Photocatalysis driven by solar energy is a feasible strategy to alleviate energy crises and environmental problems. In recent years, significant progress has been made in developing advanced photocatalysts for efficient solar‐to‐chemical energy conversion. Single‐atom catalysts have the advantages of highly dispersed active sites, maximum atomic utilization, unique coordination environment, and electronic structure, which have become a research hotspot in heterogeneous photocatalysis. This paper introduces the potential supports, preparation, and characterization methods of single‐atom photocatalysts in detail. Subsequently, the fascinating effects of single‐atom photocatalysts on three critical steps of photocatalysis (the absorption of incident light to produce electron‐hole pairs, carrier separation and migration, and interface reactions) are analyzed. At the same time, the applications of single‐atom photocatalysts in energy conversion and environmental protection (CO2 reduction, water splitting, N2 fixation, organic macromolecule reforming, air pollutant removal, and water pollutant degradation) are systematically summarized. Finally, the opportunities and challenges of single‐atom catalysts in heterogeneous photocatalysis are discussed. It is hoped that this work can provide insights into the design, synthesis, and application of single‐atom photocatalysts and promote the development of high‐performance photocatalytic systems.

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“…Moreover, several other works using XAS analysis confirmed metals atomically dispersed in carbon nitrides, in some cases accurately describing the chemical environment. We list here, in our opinion, the most relevant works, which confirmed metal single-atoms supported in carbon nitridebased materials using XAS: Fe, 43,[294][295][296][297][298][299] Co, 47,289,290,[300][301][302][303][304][305][306][307] Ti, 5 Zn, 32,308,309 Cr, 310 V, 311 Ni, 45,[312][313][314] Mn, 27,315 Mo, 35,316,317 Cu, 14,288,293,[318][319][320][321][322][323] Sb, 42 Pd, 18,256,260,282,…”

Section: X-ray Source Techniquesmentioning

confidence: 99%

“…414 A totally similar approach was reproduced in numerous works in the following years, with atomically distributed dispersions usually proven by STEM–HAADF imaging. Most common transition metals deposited from inorganic or organic salts through this technique include Mn, 315,415–417 Fe, 418–423 Co, 46,424–426 Cu, 288,427–429 Ni, 45,46,313,430 Ag, 46 V, 311 Mo 317 and W. 431 Metal loadings were between 0.1 wt% and 5 wt%, with few exceptions, including ultra-high loadings of 20 wt% or above. 425,428,430 Interestingly, some of these works synthesized CN from a dicyandiamide–formaldehyde resin.…”

Section: Synthesis Of Sacs Based On Carbon Nitride Materialsmentioning

confidence: 99%

Carbon nitride based materials: more than just a support for single-atom catalysis

et al. 2023

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Single atom Mn anchored on N-doped porous carbon derived from spirulina for catalyzed peroxymonosulfate to degradation of emerging organic pollutants

Cited by 117 publications

References 52 publications

Single-Atom Nanozyme Based on Mn-Center with Enhanced Peroxidase-like Activity for Organic Dye Degradation

Single-Atom Nanozyme Based on Mn-Center with Enhanced Peroxidase-like Activity for Organic Dye Degradation

Recent Progress of Single‐Atom Photocatalysts Applied in Energy Conversion and Environmental Protection

Carbon nitride based materials: more than just a support for single-atom catalysis

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