Oxidized graphitic carbon nitride as a sustainable metal-free catalyst for hydrogen transfer reactions under mild conditions

Choudhary

et al. 2021

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143

Section: Reductionsmentioning

confidence: 99%

Recent Advances in Plasmonic Photocatalysis Based on TiO₂ and Noble Metal Nanoparticles for Energy Conversion, Environmental Remediation, and Organic Synthesis

Choudhary

et al. 2021

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“…The XRD results are in good agreement with the literature. 33,35 It is interesting to note that the full width half maximum (FWHM) and intensity values varied with respect to oxidation of g-C 3 N 4 and PANI coated g-C 3 N 4 (2e). The formation of a lower degree of crystallinity in modified g-C 3 N 4 nanocomposites results from the presence of oxygen deficit defect and disorders.…”

Section: Dmfc Analysismentioning

confidence: 99%

Synthesis and characterization of conductive polymer coated graphitic carbon nitride embedded sulfonated poly (ether ether ketone) membranes for direct methanol fuel cell applications

et al. 2021

Direct methanol fuel cell (DMFC) is a sustainable energy conversion device that is known for its advantages in terms of portability as well as can be stored and transported safely. Functionalized nanostructured materials have been used in proton exchange membrane (PEM) for DMFC applications to enhance the proton conductivity and suppress the methanol permeability. In this study, conductive polyaniline deposited oxidized graphitic carbon nitride (PANI-O-g-C 3 N 4 ) was incorporated in sulfonated poly (ether ether ketone) (SPEEK) membrane for DMFC applications. The performances of graphitic carbon nitride (g-C 3 N 4 ) and oxidized graphitic carbon nitride (O-g-C 3 N 4 ) on SPEEK PEM were also assessed and compared. The morphological and X-ray diffraction analysis indicated that the structure and crystallinity were altered with the deposition of PANI on g-C 3 N 4 . The scanning electron microscopy and topography analysis revealed that the existence of g-C 3 N 4 and functionalized g-C 3 N 4 were clearly seen on the surface of the SPEEK membrane. Water uptake capacity and ion exchange capacity were significantly improved in the functionalized g-C 3 N 4 -modified SPEEK membrane (O-g-C 3 N 4 /SPEEK and PANI-O-g-C 3 N 4 / SPEEK). The lower methanol permeability and higher proton conductivity of 3.71 Â 10 À7 cm À2 S À1 and 5.34 Â 10 À3 S cm À1 were recorded by 0.1 wt% PANI-O-g-C 3 N 4 incorporated SPEEK membrane. Functionalized g-C 3 N 4modified SPEEK membrane also exhibited higher oxidative stability. The performance of the PANI-O-g-C 3 N 4 incorporated SPEEK membrane in DMFC application highlights its potential as a superior nanofiller for the modification of PEM.

“…[34] Regarding CN, Figure 3c shows that the N 1s spectrum exhibited four peaks at 398.5, 399.5, 401.1, and 404.4 eV that originated from the sp 2 -hybridized N in the CÀ N=C groups, tertiary nitrogen (NÀ (C) 3 ) groups, and presence of the amino groups containing a CÀ NÀ H bond with a charge effect in the heterocycles. [35][36][37] Compared with the spectrum of CN, the N 1s spectrum of OCN-3 was slightly shifted, probably owing to the chemical oxidation environment. [38] Figure 3d displays binding energy of 532.2 eV for the O 1s spectra of CN that were assigned to the adsorption of H 2 O.…”

Section: Xps Analysismentioning

confidence: 99%

Enhancement of the Photodegradation Activity of Methylene Blue by the Low‐temperature Regulation of Oxide‐rich Graphitic Carbon Nitride

Xie

Fang

et al. 2021

ChemistrySelect

Oxygen‐rich graphitic carbon nitride (OCN‐3) was synthesized by low‐temperature regulation after the chemical oxidation of g‐C3N4, which was prepared by the calcination of melamine at a high temperature. Further, its photocatalytic activity was evaluated using methylene blue (MB) as the target pollutant for degradation. The characteristic results showed that OCN‐3 exhibited larger specific surface area (SSA) than pure g‐C3N4. Moreover, the recombination rate of its photogenerated carriers was significantly reduced. The photocatalytic degradation was performed with an MB solution that was prepared using ultrapure, tap, and lake water samples as the base liquids to measure the photocatalytic activity of OCN‐3. The experimental results display that the remove rate of MB has reached 83.7 %, 91.26 % and 95.2 %, respectively. The degradation of MB three consecutive times indicated that the catalyst exhibited good stability and reusability.