Synthesis of carbon-doped g-C3N4 composites with enhanced visible-light photocatalytic activity

Characterization of urea derived polymeric carbon nitride and resultant thermally vacuum deposited amorphous thin films: Structural, chemical and photophysical properties

“…Two pronounced peaks were observed at 27.47 and 13.13° in p-CN diffraction pattern corresponding to the interlayer stacking peak of aromatic systems and the in-plane structural packing motif of tri-s-triazine units [36], respectively, which is in consistence with the reported p-CN derived from thermal decomposition of urea [8,33,34]. It is important to note that very similar diffraction patterns with practically identical peak positions were obtained via thermal treatment (temperature range of 520-550 ºC) of melamine [23,25,26,56] and dicyandiamide [11,13,16,18] as source materials. The initial molecular structure of p-CN was reconstructed from [44].…”

“…Two features at 288.2 eV and 284.9 eV were attributed to the existence of C-N-C coordination and surface adventitious carbon, respectively [13]. The third feature at 293.5 eV was assigned to the π-electron delocalization in p-CN heterocycles [38].…”

“…The p-CN only consists of abundant elements in a tri-s-triazine ring structure as elementary building block. It can be synthesized via a straightforward and scalable process from relatively cheap source materials such as dicyandiamide [10][11][12][13][14][15][16][17][18], cyanamide [19], ammonium thiocyanate [20], melamine [21][22][23][24][25][26][27][28][29][30], urea [8,9,[31][32][33][34][35][36], thiourea [28], guanidine carbonate [37] and thiosemicarbazide [38]. Generally, synthesis methods of p-CN involve thermal treatment of precursor material in the temperature range of 450-650 °C.…”

“…Three features at 285.5, 290.3 and 292.5 eV were attributed to carbon bounds in C-O-C, C-O=C and π-electron delocalization, respectively.Two features at 287.9 and 284.2 eV indicated the existence of C-N-C coordination and surface adventitious carbon, respectively[13]. Nitrogen N 1s region was deconvoluted into five components centered at 398.5, 399.8, 401.1, 403.19 and 405.6 eV.…”

Novel P O codoped g-C3N4 with large specific surface area: Hydrothermal synthesis assisted by dissolution–precipitation process and their visible light activity under anoxic conditions

“…However, the ionic liquid [Bmim]PF 6 is not an ideal phosphorus source due to its high price and complicated synthesis process. In addition to S, P and I, other dopants (C and B) have also been used [19,20]. Codoping could combine the advantages of these dopants, leading to improved photocatalytic performance.…”