Pyrolysis Synthesized g‐C₃N₄ for Photocatalytic Degradation of Methylene Blue

Abstract

Graphitic carbon nitride (g-C3N4) was synthesized at 520°C by the pyrolysis of cyanamide, dicyandiamide, and melamine. The samples were characterized by X–ray diffraction (XRD), UV-visible diffuse reflectance spectra, Fourier transform infrared spectroscopy (FT-IR), and elemental analyzer. The photocatalytic activity of g-C3N4was evaluated by the photodegrading experiments of methylene blue (MB). The results indicated that g-C3N4. A photocatalytic mechanism presumed the MB photodegradation over the C3N4photocatalyst is attributed to photogenerated electron impelled multistep reduction of O2.

Synthesis of reduced carbon nitride at the reduction by hydroquinone of water-soluble carbon nitride oxide (g-C3N4)O

“…3 curves 4 and 5) and synthesized carbon nitride (SCN) (Fig. 3 curve 1) have the general absorption bands at $ 810 cm À 1 and in the 1200-1650 cm À 1 region, which correspond to "breathing" vibration of a triazine ring in g-C 3 N 4 and the stretching vibrations of aromatic CN-bonds in condensed carbon-nitrogen heterocycles accordingly [28][29][30][31]. At the same time, the IR spectra of both samples CNO have the absorption bands of oxygen containing groups [5] which are absent in the IR spectrum of SCN.…”

Nanoparticles of Graphitic Carbon Nitride: Stabilization in Aqueous Solutions, Spectral and Luminescent Properties

“…The X-ray diffractogram of the product from pyrolysis of urea contains a peak at 27.6°c haracteristic of layered GCN and corresponding to an interlayer distance of d 002 = 0.323 nm [15]. A fairly wide assortment of d 002 values (ranging from 0.319 to 0.326 nm) have been reported for GCN [16][17][18][19][20][21][22], depending on the method of synthesis and on the nature of the initial compound, but in most papers a value of d 002 = 0.326 nm is quoted. The increase of d 002 is associated with disordering of the layer structure of GCN due to the presence of residual amino groups in its composition that avoid condensation.…”

“…1b, curve 1) there is a band at 810 cm -1 , which is the so-called fingerprint of heterocycles of the triazine and heptazine series and arises from the deformation vibrations of the N-C=N bonds in these compounds [16,17,27]. Apart from this, the spectrum contains bands at 1265, 1320, 1420, 1490, and 1570 cm -1 , characteristic of triazine, heptazine, and their derivatives [27][28][29][30], and also a band at 1620 cm -1 , which can be assigned to the deformation vibrations of adsorbed water.…”

Accelerated decomposition of Oxone using graphene-like carbon nitride with visible light irradiation for enhanced decolorization in water

“…1(d), in which several peaks occur in 800−1700 cm −1 , derived from the chemical bonding between carbon and nitrogen. The peak at 808 cm −1 can be assigned to the characteristic breathing mode of the triazine units [33]. The peaks at 1238, 1412 and 1563 cm −1 can be attributed to the stretching modes of C-N heterocyclics [34].…”