Fast and lasting electron transfer between γ-FeOOH and g-C3N4/kaolinite containing N vacancies for enhanced visible-light-assisted peroxymonosulfate activation

Zhang, Xiangwei; Liu, Yangyu; Li, Chunquan; Tian, Long; Yuan, Fang; Zheng, Shuilin; Sun, Zhiming

doi:10.1016/j.cej.2021.132374

Cited by 77 publications

(7 citation statements)

References 59 publications

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“…[16] For HCN, the intensity of Lorentzian line is extremely weak because only a few unpaired electrons coming from the edges of the heptazine rings exist. [17] In the case of AHCN 2 , the intensity of Lorentzian line is almost the same as that of HCN, revealing that the introduction of certain graphitic C atoms by replacing N atoms causes little defect in heptazine units. Whereas, the intensity of Lorentzian line increases remarkably for FHCN 2 , highlighting that much more unpaired electrons are generated owing to the introduction of N vacancies within heptazine units and the generated structural defects.…”

Section: Resultsmentioning

confidence: 87%

Acetamide‐ or Formamide‐Assisted In Situ Approach to Carbon‐Rich or Nitrogen‐Deficient Graphitic Carbon Nitride for Notably Enhanced Visible‐Light Photocatalytic Redox Performance

Zhang

Yang

Meng

et al. 2023

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graphitic carbon nitride (g-C 3 N 4 ), possesses unique properties including visible-light response and strong light harvesting capacity; more importantly, the polymeric nature renders g-C 3 N 4 as a highly flexible host for precise molecular structure modification along with wellcontrolled electronic structure and energy levels, which provide infinite opportunities for g-C 3 N 4 -based photocatalysis in organic pollutant degradation and clean energy production. [2] Among versatile modification approaches, small organic molecule-assisted synthesis of g-C 3 N 4based photocatalysts has been well developed for achieving exciting photocatalytic redox performance. On the one hand, the copolymerization of C/N monomer with small organic molecule can result in carbon atom self-doping and/or heteroatom doping into the heptazine rings of g-C 3 N 4 framework, and thus π-electronic system and energy levels of g-C 3 N 4 can be well adjusted; on the other hand, the copolymerization can create C and/or N as well as structural defects in g-C 3 N 4 framework, which can not only regulate the band structure by as-generated defect-induced midgap state to improve light absorption in visible-light region but also significantly inhibit the recombination of electrons and holes because the defects can function as electron trapping sites. Both the dopant and vacancy are classified as highly effective point defects in g-C 3 N 4 , and they play the dominant roles in the photocatalytic redox performance of g-C 3 N 4 . [3] Moreover, in comparison of conventional point defect engineering strategies (e.g., annealing treatment under H 2 or inert atmosphere [4] and reduction by reductant [5] ) that face the challenge of hardly controlling of the locations, concentrations and types of the defects on g-C 3 N 4 framework precisely, small organic molecule-assistance is a reliable synthesis protocol for the accurate and uniform engineering of point defects. A lot of π-electron-rich small organic molecules, such as L-cysteine, [6] nicotinic acid, [7] uracil, [8] barbituric acid, [9] 2-aminobenzothiazole, [10] creatinine [11] and phloroglucinol, [12] are successfully applied to introduce organic fragment into g-C 3 N 4 framework by thermal copolymerizing Acetamide-or formamide-assisted in situ strategy is designed to synthesize carbon atom self-doped g-C 3 N 4 (AHCN x ) or nitrogen vacancy-modified g-C 3 N 4 (FHCN x ). Different from the direct copolymerization route that suffers from the problem of mismatched physical properties of acetamide (or formamide) with urea, the synthesis of AHCN x (or FHCN x ) starts from a crucial preorganization step of acetamide (or formamide) with urea via freeze dryinghydrothermal treatment so that the chemical structures as well as C-doping level in AHCN x and N-vacancy concentration in FHCN x can be precisely regulated. By using various structural characterization methods, well-defined AHCN x and FHCN x structures are proposed. At the optimal C-doping level in AHCN x or N-vacancy concentration in FHCN x , both AHCN ...

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Section: Resultsmentioning

confidence: 87%

Acetamide‐ or Formamide‐Assisted In Situ Approach to Carbon‐Rich or Nitrogen‐Deficient Graphitic Carbon Nitride for Notably Enhanced Visible‐Light Photocatalytic Redox Performance

Zhang

Yang

Meng

et al. 2023

Small

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“…Figure c,d shows the XPS spectrum of N 1s; the peaks at around 402.4, 400.7, 398.4, 399.9, and 405.0 eV were assigned to graphitic N, pyrrole-N, pyridinic-N, Fe–N x , and oxidized N . The percentages of these N were summarized in Table S4, compared with other catalysts; the surface of 5Fe-HM@C-850 catalyst has the highest Fe–N content (27.27%), which is often identified as an efficient active site for catalytic oxidation …”

Section: Resultsmentioning

confidence: 99%

“…Figure 4c,d shows the XPS spectrum of N 1s; the peaks at around 402.4, 400.7, 398.4, 399.9, and 405.0 eV were assigned to graphitic N, pyrrole-N, pyridinic-N, Fe−N x , and oxidized N. 31 The percentages of these N were summarized in Table S4, compared with other catalysts; the surface of 5Fe-HM@C-850 catalyst has the highest Fe−N content (27.27%), which is often identified as an efficient active site for catalytic oxidation. 32 FTIR spectral analysis was carried out to describe the surface functional groups of αFe-HM@C-T, and the results are shown in Figure 5a. These spectra consist mainly of five peaks at 3749, 3536, 2934, 1542, and 1093 cm −1 , which are assigned to N�H, �OH/�CH, �CH 2 , C�C, and C�C, 33 respectively.…”

Section: Analysis Of Surface Composition and Redox Propertymentioning

confidence: 99%

High Efficiency Degradation Organic Pollutant Using Novel Heme-Derived Fe–N Co-Doped Carbon Catalyst Activated PDS and H₂O₂

Jiang,

Hou,

Yang

et al. 2024

J. Phys. Chem. C

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Fe−N co-doped carbon catalyst has received increasing attention in the field of organic wastewater treatment because of its unique structure and outstanding activity. However, the reusability, catalytic activity, and pH working range are still a great challenge for future application. Herein, a novel αFe-HM@ C-T catalyst was prepared by pyrolyzing a mixture of starch and heme and was analyzed by TEM, H 2 -TPR, XRD, BET, XPS, FTIR, and Raman spectrum. Meanwhile,

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“…This may indicate that calcination broke down the chitosan structure and created carboxylic acid in MCC. Furthermore, CHS has a strong peak around 500 cm −1 , which is frequently recognized as the result of Fe-O vibrations in γ-FeOOH [43]. The peak at 500 cm −1 faded in MCC, and a new peak that protruded at 564 cm −1 -related to Fe-O vibration in Fe3O4-appeared [36].…”

Section: Xrdmentioning

confidence: 99%

Facile Preparation of Magnetic Chitosan Carbon Based on Recycling of Iron Sludge for Sb(III) Removal

Zeng,

Xu,

Zeng

et al. 2024

Sustainability

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In this study, following the concept of “treating waste with waste”, magnetic chitosan carbon (MCC) was developed through the pyrolysis of chitosan/iron sludge (CHS) beads created using an embedding method in a closed environment for antimony removal. The results indicate MCC has a good magnetic recovery rate and that its magnetic saturation strength can reach 33.243 emu/g. The iron proportion and acid resistance of MCC were all better than those of CHS, and at 25 °C, its adsorption saturation capacity improved from 24.956 mg/g to 38.234 mg/g. MCC has a quick adsorption equilibrium time, and in about 20 min, 90% of the final equilibrium capacity can be achieved. The primary mechanism of Sb adsorption by MCC is the formation of an inner sphere complex between Fe-O and Sb, while surface complexation, hydrogen bonding, and interaction also play a function. Thus, MCC, a lower-cost and greener adsorbent for Sb removal, has been made using iron sludge. This enabled it to utilize iron sludge as a resource and served as a reference for the sustainable management of water treatment residuals.

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Fast and lasting electron transfer between γ-FeOOH and g-C3N4/kaolinite containing N vacancies for enhanced visible-light-assisted peroxymonosulfate activation

Cited by 77 publications

References 59 publications

Acetamide‐ or Formamide‐Assisted In Situ Approach to Carbon‐Rich or Nitrogen‐Deficient Graphitic Carbon Nitride for Notably Enhanced Visible‐Light Photocatalytic Redox Performance

Acetamide‐ or Formamide‐Assisted In Situ Approach to Carbon‐Rich or Nitrogen‐Deficient Graphitic Carbon Nitride for Notably Enhanced Visible‐Light Photocatalytic Redox Performance

High Efficiency Degradation Organic Pollutant Using Novel Heme-Derived Fe–N Co-Doped Carbon Catalyst Activated PDS and H₂O₂

Facile Preparation of Magnetic Chitosan Carbon Based on Recycling of Iron Sludge for Sb(III) Removal

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Fast and lasting electron transfer between γ-FeOOH and g-C3N4/kaolinite containing N vacancies for enhanced visible-light-assisted peroxymonosulfate activation

Cited by 77 publications

References 59 publications

Acetamide‐ or Formamide‐Assisted In Situ Approach to Carbon‐Rich or Nitrogen‐Deficient Graphitic Carbon Nitride for Notably Enhanced Visible‐Light Photocatalytic Redox Performance

Acetamide‐ or Formamide‐Assisted In Situ Approach to Carbon‐Rich or Nitrogen‐Deficient Graphitic Carbon Nitride for Notably Enhanced Visible‐Light Photocatalytic Redox Performance

High Efficiency Degradation Organic Pollutant Using Novel Heme-Derived Fe–N Co-Doped Carbon Catalyst Activated PDS and H2O2

Facile Preparation of Magnetic Chitosan Carbon Based on Recycling of Iron Sludge for Sb(III) Removal

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High Efficiency Degradation Organic Pollutant Using Novel Heme-Derived Fe–N Co-Doped Carbon Catalyst Activated PDS and H₂O₂