Carbon vacancies and hydroxyls in graphitic carbon nitride: Promoted photocatalytic NO removal activity and mechanism

Gu, Zhengrong; Cui, Zhitao; Wang, Zijing; Qin, Ken Sinkou; Asakura, Yusuke; Hasegawa, Tetsuya; Tsukuda, Satoshi; Hongo, Kenta; Maezono, Ryo; Yin, Shu

doi:10.1016/j.apcatb.2020.119376

Cited by 89 publications

(51 citation statements)

References 59 publications

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“…Another peak appearing at 888 cm −1 originates from the deformation mode of N-H bonding [33,36]. Notably, in the broad band between 3000 and 3600 cm −1 , owing to the combination of the N-H and O-H stretching vibrations, the O-H bands become relatively stronger with the increase in solvothermal treatment temperature, indicating the introduction of -OH functional groups [12,33,37]. This is consistent with the XPS data shown below.…”

Section: Structural and Chemical Propertiessupporting

confidence: 86%

“…As depicted in Figure 5, the spectra of the four samples could be fitted into the three peaks detected at approximately 398.2, 400.1, and 400.7 eV. The peak at 400.1 eV assigned to a tertiary N atom (N3C) and the dominant peak at around 398.2 eV could be attributed to the sp 2 -hybridized N bonded to two C atoms (C = N-C, N2C) [7,12,15,20,25,29,34,36,37,39]. As the solvothermal temperature increases, these N2C and N3C peaks shift from 398.2 and 400.1 eV in Pt/CN-140 to the higher binding energies of 398.4 and 400.3 eV in the Pt/CN-220 sample, respectively.…”

Section: Structural and Chemical Propertiesmentioning

confidence: 96%

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Ethanol Solvothermal Treatment on Graphitic Carbon Nitride Materials for Enhancing Photocatalytic Hydrogen Evolution Performance

Nguyen

Dao

et al. 2022

Nanomaterials

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Recently, Pt-loaded graphic carbon nitride (g-C3N4) materials have attracted great attention as a photocatalyst for hydrogen evolution from water. The simple surface modification of g-C3N4 by hydrothermal methods improves photocatalytic performance. In this study, ethanol is used as a solvothermal solvent to modify the surface properties of g-C3N4 for the first time. The g-C3N4 is thermally treated in ethanol at different temperatures (T = 140 °C, 160 °C, 180 °C, and 220 °C), and the Pt co-catalyst is subsequently deposited on the g-C3N4 via a photodeposition method. Elemental analysis and XPS O 1s data confirm that the ethanol solvothermal treatment increased the contents of the oxygen-containing functional groups on the g-C3N4 and were proportional to the treatment temperatures. However, the XPS Pt 4f data show that the Pt2+/Pt0 value for the Pt/g-C3N4 treated at ethanol solvothermal temperature of 160 °C (Pt/CN-160) is the highest at 7.03, implying the highest hydrogen production rate of Pt/CN-160 is at 492.3 μmol g−1 h−1 because the PtO phase is favorable for the water adsorption and hydrogen desorption in the hydrogen evolution process. In addition, the electrochemical impedance spectroscopy data and the photoluminescence spectra emission peak intensify reflect that the Pt/CN-160 had a more efficient charge separation process that also enhanced the photocatalytic activity.

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Section: Structural and Chemical Propertiessupporting

confidence: 86%

Section: Structural and Chemical Propertiesmentioning

confidence: 96%

Ethanol Solvothermal Treatment on Graphitic Carbon Nitride Materials for Enhancing Photocatalytic Hydrogen Evolution Performance

Nguyen

Dao

et al. 2022

Nanomaterials

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“…In addition, Figure 3d shows the time‐resolved photoluminescence (TRPL) decay spectra of NU‐1000 and In 2 S 3 /NU‐1000‐3. The PL lifetimes of NU‐1000 and In 2 S 3 /NU‐1000‐3 were calculated according to the exponential equation Equation [39 40]

true Y = y_{0} + A_{1} e x p (() - \frac{t}{τ_{1}}) + A_{2} e x p (() - \frac{t}{τ_{2}})

…”

Section: Resultsmentioning

confidence: 99%

“…

τ_{1}

and

τ_{2}

are the excited‐state luminescence decay time, corresponding to

A_{1}

and

A_{2}

, respectively. In addition, the average lifetimes of NU‐1000 and In 2 S 3 /NU‐1000‐3 could be calculated by the Equation [39 40]

true τ = \frac{A_{1} τ_{1}^{2} + A_{2} τ_{2}^{2}}{A_{1} τ_{1} + A_{2} τ_{2}}

…”

Section: Resultsmentioning

confidence: 99%

Z‐Scheme In₂S₃/NU‐1000 Heterojunction for Boosting Photo‐Oxidation of Sulfide into Sulfoxide under Ambient Conditions

Wang

Shen

Zhang

et al. 2021

Chemistry A European J

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Photocatalytic oxidation of sulfide into sulfoxide has attracted extensive attention as an environmentally friendly strategy for chemical transformations or toxic chemicals degradation. Herein, we construct a series of In2S3/NU‐1000 heterojunction photocatalysts, which can efficiently catalyze the oxidation of sulfides to form sulfoxides as the sole product under LED lamp (full‐spectrum) illumination in air at room temperature. Especially, the sulfur mustard simulant, 2‐chloroethyl ethyl sulfide (CEES), can also be photocatalytically oxidized with In2S3/NU‐1000 to afford nontoxic 2‐chloroethyl ethyl sulfoxide (CEESO) selectively and effectively. In contrast, individual NU‐1000 and In2S3 show very low catalytic activity on this reaction. The significantly improved photocatalytic activity is ascribed to the constructing of an efficient Z‐scheme photocatalysts In2S3/NU‐1000, which exhibits the enhancement of light harvesting, the promotion of photogenerated electron‐hole separation, and the retention of high porosity of the parent MOF. Moreover, mechanism studies in photocatalytic oxidation reveal that the superoxide radical (.O2−) and singlet oxygen (1O2) are the main oxidative species in the oxidation system. This work exploits the opportunities for the construction of porous Z‐scheme photocatalysts based on the photoactive MOFs materials and inorganic semiconductors for promoting catalytic organic transformations. More importantly, it provides a route to the rational design of efficient photocatalysts for the detoxification of mustard gas.

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“…[ 45 , 105 , 178 ] In addressing the aforementioned problems, considerable effort has been made on PCN‐based photocatalysts by a nanostructure design (adjusting the polymerization process, incorporating the defective sites, controlling the morphologies, and transforming the types of the semiconductor). [ 120 , 179 , 180 , 181 , 182 ] The electronic structure regulations are used to modify the light absorption of and the redox potentials through adding cations and anions and co‐doping, or molecular doping of PCN. [ 115 , 117 , 125 , 128 , 136 , 183 ] The heterostructure constructions through band alignment are also designed to accelerate the kinetics of charges, and the synergistic effects of multi‐components increase the adsorption of reactants/desorption of products, mass transfer, and ROS generation, thereby promoting the PODN efficiency.…”

Section: Application Of Pcn In Environmental Catalysismentioning

confidence: 99%

Photocatalytic Air Purification Using Functional Polymeric Carbon Nitrides

Zhou¹,

et al. 2021

Advanced Science

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The techniques for the production of the environment have received attention because of the increasing air pollution, which results in a negative impact on the living environment of mankind. Over the decades, burgeoning interest in polymeric carbon nitride (PCN) based photocatalysts for heterogeneous catalysis of air pollutants has been witnessed, which is improved by harvesting visible light, layered/defective structures, functional groups, suitable/adjustable band positions, and existing Lewis basic sites. PCN-based photocatalytic air purification can reduce the negative impacts of the emission of air pollutants and convert the undesirable and harmful materials into value-added or nontoxic, or low-toxic chemicals. However, based on previous reports, the systematic summary and analysis of PCN-based photocatalysts in the catalytic elimination of air pollutants have not been reported. The research progress of functional PCN-based composite materials as photocatalysts for the removal of air pollutants is reviewed here. The working mechanisms of each enhancement modification are elucidated and discussed on structures (nanostructure, molecular structue, and composite) regarding their effects on light-absorption/utilization, reactant adsorption, intermediate/product desorption, charge kinetics, and reactive oxygen species production. Perspectives related to further challenges and directions as well as design strategies of PCN-based photocatalysts in the heterogeneous catalysis of air pollutants are also provided.

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Carbon vacancies and hydroxyls in graphitic carbon nitride: Promoted photocatalytic NO removal activity and mechanism

Cited by 89 publications

References 59 publications

Ethanol Solvothermal Treatment on Graphitic Carbon Nitride Materials for Enhancing Photocatalytic Hydrogen Evolution Performance

Ethanol Solvothermal Treatment on Graphitic Carbon Nitride Materials for Enhancing Photocatalytic Hydrogen Evolution Performance

Z‐Scheme In₂S₃/NU‐1000 Heterojunction for Boosting Photo‐Oxidation of Sulfide into Sulfoxide under Ambient Conditions

Photocatalytic Air Purification Using Functional Polymeric Carbon Nitrides

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Carbon vacancies and hydroxyls in graphitic carbon nitride: Promoted photocatalytic NO removal activity and mechanism

Cited by 89 publications

References 59 publications

Ethanol Solvothermal Treatment on Graphitic Carbon Nitride Materials for Enhancing Photocatalytic Hydrogen Evolution Performance

Ethanol Solvothermal Treatment on Graphitic Carbon Nitride Materials for Enhancing Photocatalytic Hydrogen Evolution Performance

Z‐Scheme In2S3/NU‐1000 Heterojunction for Boosting Photo‐Oxidation of Sulfide into Sulfoxide under Ambient Conditions

Photocatalytic Air Purification Using Functional Polymeric Carbon Nitrides

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Product

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Z‐Scheme In₂S₃/NU‐1000 Heterojunction for Boosting Photo‐Oxidation of Sulfide into Sulfoxide under Ambient Conditions