Efficient and stable photocatalytic NO removal on C self-doped g-C<sub>3</sub>N<sub>4</sub>: electronic structure and reaction mechanism

Ran, Maoxi; Li, Jiarui; Cui, Wen; Li, Yuhan; Li, Peidong; Dong, Fan

doi:10.1039/c8cy00887f

Cited by 65 publications

(24 citation statements)

References 66 publications

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“…A new peak located at 1350 cm −1 appears, and the peak at 1230 cm −1 disappears (partial enlarged spectra shown in Figure S9 in the Supporting Information). [37,38] The intensities of signal peak become stronger after B-doping, indicating higher concentration of unpaired electrons in B-doped g-C 3 N 4 . Sci.…”

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confidence: 99%

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Graphitic Carbon Nitride with Dopant Induced Charge Localization for Enhanced Photoreduction of CO₂ to CH₄

et al. 2019

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The photoreduction of CO2 to hydrocarbon products has attracted much attention because it provides an avenue to directly synthesize value‐added carbon‐based fuels and feedstocks using solar energy. Among various photocatalysts, graphitic carbon nitride (g‐C3N4) has emerged as an attractive metal‐free visible‐light photocatalyst due to its advantages of earth‐abundance, nontoxicity, and stability. Unfortunately, its photocatalytic efficiency is seriously limited by charge carriers′ ready recombination and their low reaction dynamics. Modifying the local electronic structure of g‐C3N4 is predicted to be an efficient way to improve the charge transfer and reaction efficiency. Here, boron (B) is doped into the large cavity between adjacent tri‐s‐triazine units via coordination with two‐coordinated N atoms. Theoretical calculations prove that the new electron excitation from N (2px, 2py) to B (2px, 2py) with the same orbital direction in B‐doped g‐C3N4 is much easier than N (2px, 2py) to C 2pz in pure g‐C3N4, and improves the charge transfer and localization, and thus the reaction dynamics. Moreover, B atoms doping changes the adsorption of CO (intermediate), and can act as active sites for CH4 production. As a result, the optimal sample of 1%B/g‐C3N4 exhibits better selectivity for CH4 with ≈32 times higher yield than that of pure g‐C3N4.

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confidence: 99%

“…Primary Lorentzian lines with g value of 2.00 can be observed in three samples. These signals come from the unpaired electrons on the sp 2 ‐nitrogen atoms of the π‐conjugated C–N aromatic rings . The intensities of signal peak become stronger after B‐doping, indicating higher concentration of unpaired electrons in B‐doped g‐C 3 N 4 .…”

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Graphitic Carbon Nitride with Dopant Induced Charge Localization for Enhanced Photoreduction of CO₂ to CH₄

et al. 2019

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“…A facile solid state transformation route comprised of sol-gel and thermal exfoliation techniques followed for the synthesis of N doped g-C which accelerates oxidation process. Furthermore, they found improved BET surface area from 81 m 2 /g to 118 m 2 /g of bulk g-C 3 N 4 and C self-doped g-C 3 N 4 , respectively also there is an increased NO removal efficiency to 56.77 % after 30 min of visible light irradiation [141]. A synergistic effect has been observed between carbon dopant and g-C 3 N 4 for photocatalytic degradation of MB dye.…”

Section: Nitrogen Carbon Boron and Halogen Doped G-c 3 N 4 Photocatmentioning

confidence: 90%

Recent advances in noble metal free doped graphitic carbon nitride based nanohybrids for photocatalysis of organic contaminants in water: A review

Hasija

Raizada

Sudhaik

et al. 2019

Applied Materials Today

428

121

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Extensive contamination of water bodies by textile dyeing industries, organic pollutants and agricultural waste has emerged water pollution as one of the major global environmental crisis. The effect of this gross negligence is posing serious threats to human health therefore today; conserving water resources for the essence of life is of grave concern. Recently, advancements in photocatalytic properties of graphitic carbon nitride (g-C 3 N 4) for wastewater treatment have gained tremendous interest in research. However, pristine g-C 3 N 4 suffers from bottlenecks such as low surface area, rapid recombination of photo-generated electron-hole pairs and insufficient light absorption which thereby, reduces the photocatalytic degradation activity. Hitherto, noble metals have been widely utilized as dopants but are cost ineffective, rarely found and are difficult to recover. In this updated and allinclusive review we have briefly discussed photocatalysis mechanism, primarily focused on nonprecious elemental doping via various synthesis techniques of noble metal free doped g-C 3 N 4 photocatalysts. Typically metal, non-metal, rare earth metal doping and co-doping have been explored, which demonstrates the synergistic behavior of the doped nanocomposites in modulation of electronic structure, broaden the visible light absorption range, enhancement in photocatalytic wastewater remediation ability to obtain maximum pollutant eradication. Summary remarks conclude the review with valuable knowledge of noble metal free doped g-C 3 N 4 photocatalysts for water purification and sheds light on current challenges and crucial issues associated with its commercialization. The future aspect aims at designing of efficient solar light driven photocatalysts for application in various domains i.e. production of H 2 and O 2 , reduction of CO 2 , practical use of solar cells, treatment of wastewater, air purification and environmental conservation. Keywords: Graphitic carbon nitride (g-C 3 N 4); Inherent drawbacks of g-C 3 N 4 as photocatalyst; Noble metal free doping of g-C 3 N 4 ; Improved photocatalytic activity; Wastewater treatment 3. Noble metal free doped g-C 3 N 4 photocatalyst for water purification………………00 3.1 Na-K doped g-C 3 N 4 photocatalyst…………………………………………………00 3.2 Transition metal doped g-C 3 N 4 photocatalyst……………………………………00 3.3 Rare earth metal doped g-C 3 N 4 photocatalyst……………………………………00 4. Non-metal doping g-C 3 N 4 photocatalyst for water purification…………………00 4.1 Phosphorus doped g-C 3 N 4 photocatalyst…………………………………………00 4.2 Sulfur doped g-C 3 N 4 photocatalyst………………………………………………00 4.3 Oxygen doped g-C 3 N 4 photocatalyst………………………………………………00 4.4 Nitrogen, carbon, boron and halogen doped g-C 3 N 4 photocatalyst…………………00 5. Metal/nonmetal co-doping of g-C 3 N 4 photocatalyst for water purification…………00 6. Other potential applications of modulated g-C 3 N 4 …..…………00 7. Conclusion and future aspects………………………………..…………00

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“…Hence, it is urgently necessary to effectively decompose the NOx in the atmosphere [3,4]. The photocatalytic technology, which can effectively convert NOx to NO3 -, has been developed for a few years for NOx removal [5][6][7]. However, most photocatalysts can only oxidize a high concentration of NOx in the stable atmosphere, and only a few works have investigated the photocatalytic ppb-level NOx oxidation in continuous-flowing air [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

S-scheme Sb2WO6/g-C3N4 photocatalysts with enhanced visible-light-induced photocatalytic NO oxidation performance

Ren

et al. 2021

Chinese Journal of Catalysis

178

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Efficient and stable photocatalytic NO removal on C self-doped g-C₃N₄: electronic structure and reaction mechanism

Abstract: The unique electronic structure of C self-doped g-C3N4 enables highly enhanced photocatalytic NO removal efficiency.

Cited by 65 publications

References 66 publications

Graphitic Carbon Nitride with Dopant Induced Charge Localization for Enhanced Photoreduction of CO₂ to CH₄

Graphitic Carbon Nitride with Dopant Induced Charge Localization for Enhanced Photoreduction of CO₂ to CH₄

Recent advances in noble metal free doped graphitic carbon nitride based nanohybrids for photocatalysis of organic contaminants in water: A review

S-scheme Sb2WO6/g-C3N4 photocatalysts with enhanced visible-light-induced photocatalytic NO oxidation performance

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Efficient and stable photocatalytic NO removal on C self-doped g-C3N4: electronic structure and reaction mechanism

Abstract: The unique electronic structure of C self-doped g-C3N4 enables highly enhanced photocatalytic NO removal efficiency.

Cited by 65 publications

References 66 publications

Graphitic Carbon Nitride with Dopant Induced Charge Localization for Enhanced Photoreduction of CO2 to CH4

Graphitic Carbon Nitride with Dopant Induced Charge Localization for Enhanced Photoreduction of CO2 to CH4

Recent advances in noble metal free doped graphitic carbon nitride based nanohybrids for photocatalysis of organic contaminants in water: A review

S-scheme Sb2WO6/g-C3N4 photocatalysts with enhanced visible-light-induced photocatalytic NO oxidation performance

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Efficient and stable photocatalytic NO removal on C self-doped g-C₃N₄: electronic structure and reaction mechanism

Graphitic Carbon Nitride with Dopant Induced Charge Localization for Enhanced Photoreduction of CO₂ to CH₄

Graphitic Carbon Nitride with Dopant Induced Charge Localization for Enhanced Photoreduction of CO₂ to CH₄