Solvothermal preparation of graphite-like C3N4 nanocrystals

Bai, Yu‐Jun; Lü, Bo; Liu, Zhengang; Li, Ling; Cui, Deliang; Xu, Xiangang; Wang, Qilong

doi:10.1016/s0022-0248(02)01981-4

Cited by 86 publications

(40 citation statements)

References 29 publications

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“…38,39 The absorption peaks at 1638 cm À1 and 1238 cm À1 are attributed to the C]N and C-N stretching modes respectively. [40][41][42][43] The sharp peak at 1638 cm À1 is an indication of good crystallinity of g-C 3 N 4 crystals. Also, broad bands of stretching and deformation modes of the NH 2 (as well as an overlapping band of O-H stretching possibly) groups at 3414 cm À1 .…”

Section: Resultsmentioning

confidence: 99%

Facile synthesis of g-C₃N₄ nanosheets loaded with WO₃ nanoparticles with enhanced photocatalytic performance under visible light irradiation

et al. 2017

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Graphitic carbon nitride (g-C 3 N 4 ) nanosheets loaded with WO 3 nanoparticles were prepared via heat treatment of g-C 3 N 4 together with WO x -EDA nanobelts. The thermal treatment temperature and WO x -EDA precursor play the key role in enhancing the interaction between WO 3 nanoparticles and g-C 3 N 4 nanosheets, because the temperature of thermal decomposition of WO x -EDA ($400 C) is close to the thermal exfoliation temperature of g-C 3 N 4 . The structure evolution and promotion effect of the nanocomposites in photocatalytic performance were well studied. It is found that WO 3 nanoparticles uniformly dispersed on the surface of the g-C 3 N 4 nanosheets, and the close integration of WO 3 and g-C 3 N 4 lead to the high photocatalytic activity in the degradation of RhB under visible light irradiation.Meanwhile, a larger specific area and increase of visible light absorption are also of benefit to speed up the degradation of organic dye. Also, the mechanism of the photocatalytic reaction and its reutilization properties were investigated.

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Section: Resultsmentioning

confidence: 99%

Facile synthesis of g-C₃N₄ nanosheets loaded with WO₃ nanoparticles with enhanced photocatalytic performance under visible light irradiation

et al. 2017

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“…A few efforts have been reported on the use of dispersed CNTs as thermal conducting fillers in polymer composites, and certain enhancements in the thermal conductivity were observed. [12,13] Previously, we reported an enhancement of 65 % in thermal conductivity with a 4 wt.-% CNT loading. [13] But the enhanced values are still not satisfactory and are far below those predicted using the law of mixtures'.…”

Section: Methodsmentioning

confidence: 92%

Preparation and Characterization of Well‐Ordered Hexagonal Mesoporous Carbon Nitride

et al. 2005

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Mesoporous carbon materials [1] with nanoscale pore sizes prepared from periodic inorganic silica templates [2±4] have been receiving much attention because of their versatility, as they are used in size-and shape-selective adsorption media, chromatographic separation systems, catalysts, nanoreactors, battery electrodes, capacitors, energy-storage devices, and biomedical devices. [1,5±8] Mesoporous carbon nitride (MCN) materials with two-dimensional (2D) pore systems promise access to an even wider range of applications because of their unique properties, such as semiconductivity, ability to intercalate, hardness, etc.[9]Until now, no such material has been reported. However, there are many reports on the synthesis and characterization of nonporous carbon nitride materials.[10±19] These materials can be prepared either from molecular or chemical precursors at very high temperatures. Very recently, Qiu and Gao have reported the chemical synthesis of non-porous turbostratic carbon nitride crystallites from polymerized ethylenediamine and carbon tetrachloride.[10] Here, we used a similar chemical method for the preparation of a highly ordered mesoporous carbon nitride material, designated MCN-1, which has a uniform pore size distribution, high specific surface area, and specific pore volume. The material has a highly ordered hexagonal array of a 2D pore system with a lattice constant of 9.52 nm, and the structural symmetry of the well-known parent 2D mesoporous silica template, SBA-15, is retained. The MCN-1 material has great potential for applications, e.g., in catalysis, gas storage, lubrication, biomolecule adsorption, and drug delivery. We believe that its existence opens other possible paths for the preparation of various mesoporous carbon nitrides with different dimensional structures using other inorganic mesoporous-silica templates and carbon and nitrogen precursors.In a typical synthesis, the calcined mesoporous silica SBA-15 [20] was added to a mixture of ethylenediamine and carbon tetrachloride. The resultant mixture was refluxed and stirred at 90 C for 6 h. The template carbon nitride polymer composites were then heat-treated in a nitrogen flow to carbonize the polymer. The mesoporous carbon nitride was recovered after dissolution of the silica framework in 5 wt.-% hydrofluoric acid. The final product was washed several times with ethanol and dried overnight at 100 C. The ordered mesoporous carbon nitride MCN-1 structure was investigated by powder X-ray diffraction (XRD) and nitrogen gas adsorption measurements. The X-ray diffraction pattern of the MCN-1 material showed three clear peaks, which can be assigned to the (100), (110), and (200) diffractions of a 2D hexagonal lattice (space group p6mm) with a lattice constant a 100 = 9.52 nm. The pattern is similar to the XRD pattern of the parent mesoporous silica template SBA-15, which consists of a hexagonal arrangement of cylindrical pores; these pores are interlinked by the micropores present in the walls (Fig. 1a). Such materials with one-dimensional...

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“…More recently different solvothermal routes based on metathesis reactions have been investigated: (i) the reaction of CCl 4 and NH 4 Cl at 400°C and autogeneous pressure [57] leading to the graphitic C 3 N 4 , (ii) the liquid-solid reaction between anhydrous C 3 N 3 Cl 3 and Li 3 N using benzene as solvent (355°C, 5-6MPa) where the formation of the α and β forms have been claimed [58].…”

Section: Iv23 Solvothermal Elaboration Of C 3 Nmentioning

confidence: 99%

Solvothermal reactions: an original route for the synthesis of novel materials

2007

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Solvothermal preparation of graphite-like C3N4 nanocrystals

Cited by 86 publications

References 29 publications

Facile synthesis of g-C₃N₄ nanosheets loaded with WO₃ nanoparticles with enhanced photocatalytic performance under visible light irradiation

Facile synthesis of g-C₃N₄ nanosheets loaded with WO₃ nanoparticles with enhanced photocatalytic performance under visible light irradiation

Preparation and Characterization of Well‐Ordered Hexagonal Mesoporous Carbon Nitride

Solvothermal reactions: an original route for the synthesis of novel materials

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Solvothermal preparation of graphite-like C3N4 nanocrystals

Cited by 86 publications

References 29 publications

Facile synthesis of g-C3N4 nanosheets loaded with WO3 nanoparticles with enhanced photocatalytic performance under visible light irradiation

Facile synthesis of g-C3N4 nanosheets loaded with WO3 nanoparticles with enhanced photocatalytic performance under visible light irradiation

Preparation and Characterization of Well‐Ordered Hexagonal Mesoporous Carbon Nitride

Solvothermal reactions: an original route for the synthesis of novel materials

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Facile synthesis of g-C₃N₄ nanosheets loaded with WO₃ nanoparticles with enhanced photocatalytic performance under visible light irradiation

Facile synthesis of g-C₃N₄ nanosheets loaded with WO₃ nanoparticles with enhanced photocatalytic performance under visible light irradiation