Enhanced visible-light-driven photocatalytic removal of NO: Effect on layer distortion on g-C3N4 by H2 heating

Ho, Wingkei; Zhang, Zizhong; Xu, Mukun; Zhang, Xianwen; Wang, Xuxu; Huang, Yu

doi:10.1016/j.apcatb.2015.05.010

Cited by 136 publications

(66 citation statements)

References 30 publications

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“…However, in all cases the C/N ratio was lower than the theoretical value (0.75). This outcome is in consistence with other reported results [12,32] implying that amino groups remain due to incomplete polycondensation. According to [13], the residual hydrogen atoms bind to the edges of the g-C 3 N 4 network in the form of C-NH 2 and 2C-NH bonds.…”

Section: Page 10 Of 24supporting

confidence: 93%

“…The higher packing density perpendicular to the layers for aromatic systems with heteroatom substitution can be attributed to the localization of the electrons and stronger binding between the layers [31]. The other is the weak peak at 13.1 o corresponding to the (100) plane, which is related to the in-plane structural packing motif of tri-s-triazine units with an interplanar distance of d = 0.645 nm [18,32]. In the case of CN-650, it can be seen that both (100) and (002) diffraction peaks are less intense.…”

Section: Page 7 Of 24mentioning

confidence: 96%

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Effect of processing temperature on structure and photocatalytic properties of g-C3N4

Papailias

Giannakopoulou

Todorova

et al. 2015

Applied Surface Science

289

123

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Section: Page 10 Of 24supporting

confidence: 93%

Section: Page 7 Of 24mentioning

confidence: 96%

Effect of processing temperature on structure and photocatalytic properties of g-C3N4

Papailias

Giannakopoulou

Todorova

et al. 2015

Applied Surface Science

289

123

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“…Figure 1 illustrates the X-and Q-band EPR spectra of pristine g-C3N4 and M1 powder (initial melamine/TiO2 wt. ratio 3:1) measured in the dark at room temperature (RT) and at 100 K. In the EPR spectra of pristine g-C3N4, only a nearly isotropic signal at g = 2.003 (*) was detected (Figure 1), often observed in the EPR spectra of graphitic carbon nitride and attributed to the conduction electrons in the localized π-states of g-C3N4 [30]. An analogous EPR signal found in the TiO2 matrix upon high-temperature treatment was assigned to the medium-polarized conduction electrons or oxygen vacancies [31,32].…”

Section: Resultsmentioning

confidence: 99%

EPR Investigations of G-C3N4/TiO2 Nanocomposites

et al. 2018

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Abstract:The g-C 3 N 4 /TiO 2 nanopowders prepared by the annealing of melamine and TiO 2 P25 at 550 • C were investigated under dark and upon UV or visible-light photoactivation using X-and Q-band electron paramagnetic resonance (EPR) spectroscopy. The EPR spectra of powders monitored at room temperature and 100 K showed the impact of the initial loading ratio of melamine/TiO 2 on the character of paramagnetic centers observed. For the photocatalysts synthesized using a lower titania content, the paramagnetic signals characteristic for the g-C 3 N 4 /TiO 2 nanocomposites were already found before exposure. The samples annealed using the higher TiO 2 loading revealed the photoinduced generation of paramagnetic nitrogen bulk centers (g-tensor components g 1 = 2.005, g 2 = 2.004, g 3 = 2.003 and hyperfine couplings from the nitrogen A 1 = 0.23 mT, A 2 = 0.44 mT, A 3 = 3.23 mT) typical for N-doped TiO 2 . The ability of photocatalysts to generate reactive oxygen species (ROS) upon in situ UV or visible-light photoexcitation was tested in water or dimethyl sulfoxide by EPR spin trapping using 5,5-dimethyl 1-pyrroline N-oxide. The results obtained reflect the differences in photocatalyst nanostructures caused by the differing initial ratio of melamine/TiO 2 ; the photocatalyst prepared by the high-temperature treatment of melamine/TiO 2 wt. ratio of 1:3 revealed an adequate photoactivity in both spectral regions.

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“…Several works have been published about cathodic electroluminescence using carbon nitride electrodes [56,57]. In these cases, the luminescence was detected in the presence of oxygen or other electron acceptor species and it was related to the ability of CN to inject hot electrons and generate radicals in aqueous media.…”

Section: Resultsmentioning

confidence: 99%

A comparative photophysical and photoelectrochemical study of undoped and 2-aminothiophene-3-carbonitrile-doped carbon nitride

Díaz-García

Díez‐García

Lana–Villarreal

et al. 2016

Electrochimica Acta

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Please cite this article as: Ana Korina Díaz-García, María Isabel Díez-García, Teresa Lana-Villarreal, Roberto Gómez, A comparative photophysical and photoelectrochemical study of undoped and 2-aminothiophene-3-carbonitrile-doped carbon nitride, Electrochimica Acta http://dx. Graphical abstract Research highlights The effect of molecular doping on carbon nitride is revealed by means of photoelectrochemical and luminescence spectroelectrochemical measurements. The effect of pH on the photoelectrochemical response of pristine and doped carbon nitride is presented.2  The intensity of the emission band appearing as a result of molecular doping depends in a reversible way on the applied potential. Doped carbon nitride exhibits stronger light absorption and enhanced photocurrents for hydrogen generation. AbstractIntroducing molecular dopants in carbon nitride has been shown to dramatically modify its electronic structure, resulting in efficient charge separation and improved photocatalytic efficiency. Herein, we have studied the effect of doping carbon nitride with 2-aminothiophene-3-carbonitrile. A fundamental photoelectrochemical characterization has been performed comparing the behavior of the resulting material (ATCN) with carbon nitride (CN). On the one hand, it is shown that the photocurrent onset shifts with the pH up to a value of 8 for both materials, as expected theoretically. On the other, ATCN, which benefits from additional light absorption, shows an improved photoactivity toward hydrogen evolution. In addition, it displays intriguing photoluminescence properties that can be additionally engineered by modulating the potential. In a more general vein, this study illustrates how to shed light on the effects of introducing molecular dopants in the CN matrix.

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Enhanced visible-light-driven photocatalytic removal of NO: Effect on layer distortion on g-C3N4 by H2 heating

Cited by 136 publications

References 30 publications

Effect of processing temperature on structure and photocatalytic properties of g-C3N4

Effect of processing temperature on structure and photocatalytic properties of g-C3N4

EPR Investigations of G-C3N4/TiO2 Nanocomposites

A comparative photophysical and photoelectrochemical study of undoped and 2-aminothiophene-3-carbonitrile-doped carbon nitride

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