Morphology and defects regulation of carbon nitride by hydrochloric acid to boost visible light absorption and photocatalytic activity

Ultrathin Graphitic Carbon Nitride Nanosheets as Efficient Catalysts for Degradation of Pollutants under Visible Light

“…Meanwhile, the high‐resolution C 1s and N 1s spectra of the B‐CN and U‐CNs‐4 were also collected, as shown in Figure b and c. No obvious binding energy shift of C 1s and N 1s, indicating that the chemical states for carbon and nitrogen in the U‐CNs‐4 were the same as the B‐CN. From Figure b, the C 1s spectrum of the U‐CNs‐4 can be separated into three peaks at 288.32, 286.10 and 284.86 eV, which were respectively assigned to the sp 2 ‐bonded carbon, C‐NH and standard reference carbon . From Figure c, the N 1s spectrum of the U‐CNs‐4 can also be divided into four peaks at 405.00, 401.34, 399.69 and 398.79 eV, which were respectively ascribed sp 2 ‐bonded nitrogen, tertiary nitrogen, amino functional groups and charging effect in heptazine rings .…”

“…where V 0 Ag/AgClvsNHE is about 0.2 V at 25°C . Therefore, the CB values should be −1.33 V and −1.13 V, versus NHE, respectively.…”

“…To overcome this problem, various modification approaches have been proposed to improve the photocatalytic performance of g‐C 3 N 4 , such as elemental doping, preparation of various nanostructures and construction of a composite catalyst . Among them, ultrathin g‐C 3 N 4 nanosheets have acquired more attentions due to the remarkable capacities in improving separation efficiency of photogenerated charge carriers as well as adjusting energy band position and width, and leading to higher oxidation or reducing ability of photocatalysis . Therefore, exfoliating effectively the g‐C 3 N 4 to obtain ultrathin g‐C 3 N 4 nanosheets through an appropriate method is of significance.…”

“…However, the synthetic method required a lot of energy and times with a relatively low yield. In addition, high‐performance ultrathin g‐C 3 N 4 nanosheets with high yield can be obtained by chemical hydrothermal exfoliation, cleaving bulk g‐C 3 N 4 into small pieces and introducing favorable defects, thus reducing migration distances and recombination of electrons and holes . However, chemical exfoliation also possible altered positive polarity and destroyed conjugated system overly of g‐C 3 N 4 .…”

Three‐Dimensional Interconnected Porous Nitrogen‐Doped Carbon Hybrid Foam for Notably Promoted Direct Dehydrogenation of Ethylbenzene to Styrene

“…Meanwhile, the released NH 3 as nitrogen resource for nitrogen doping and the released HCl can etch carbon nitride layer. [50] Moreover, the freeze-drying process can efficiently promote the formation pores. [49] Therefore, we envision that a novel 3D porous nitrogen-doped carbon foam material can be prepared by polymerizing the freeze-dried glucose/NH 4 Clloaded melamine sponge, and the 3D porous foam material can exhibit excellent catalytic performance for direct dehydrogenation of ethylbenzene.…”