Enhancement of photocatalytic hydrogen evolution activity of porous oxygen doped g-C3N4 with nitrogen defects induced by changing electron transition

Enhancement of visible‐light photocatalytic degradation performance over nitrogen‐deficient g‐C3N4/KNbO3 heterojunction photocatalyst

“…35 In the N 1s spectrum, the N 3c shifts from 401.1 eV to 400 eV which could be ascribed to the existence of cyano groups whose N 1s binding energy are intermediate between those of N 2c and N 3c. 39 The N 2c intensity of CNx and 3% KNO/CNx decreased significantly, which provided evidence for the existence of N vacancy in CNx and 3% KNO/CNx composite. Furthermore, the atomic% and weight% of different elements present in CN, CNx and 3% KNO/CNx are provided and shown in Supporting Information Table S1.…”

“…Compared to CN, CNx and the 3% KNO/CNx spectra exhibit an intensive peak at 286.1 eV, which could be assigned to C‐NH x ( x = 1, 2) on the edges of heptazine units, indicating the existence of cyano groups (C≡N) since C≡N groups possess similar C 1s binding energies to C‐NH x . In the N 1s spectrum, the N 3c shifts from 401.1 eV to 400 eV which could be ascribed to the existence of cyano groups whose N 1s binding energy are intermediate between those of N 2c and N 3c . The N 2c intensity of CNx and 3% KNO/CNx decreased significantly, which provided evidence for the existence of N vacancy in CNx and 3% KNO/CNx composite.…”

“…However, it is worth noting that the (002) peak is slightly offset in the large angle direction and the peak (100) intensity decreases. This slight deviation may be related to the reduction of the stacking distance between the nanocrystals during the thermal polymerization and the loss of the planar ordered structure, which demonstrates the formation of N‐deficiency in CN. Furthermore, it is noticeable that the XRD patterns of the KNO/CNx composites with different mass fractions exhibited a reflection related to both KNO and CNx, and the characteristic peak of KNO was gradually increased as the KNO content increased, indicating that KNO and CNx were combined successfully.…”

Recent advances in photodegradation of antibiotic residues in water

“…To further improve photocatalytic properties, 2D porous materials with a more accessible BET surface and additional reactive sites are developed to completely expose the active sites to the contaminants and participate in the oxidation–reduction process, which degrades the contaminants and produces H 2 /O 2 . [302] Unfortunately, 2D porous materials, such as MoSe 2 [303] , [304] , MoS 2 [305] , [306] , [307] , and g-C 3 N 4 [308] , [309] , [310] , [311] , [312] , [313] , [314] , [315] , [316] , [317] , [318] , [319] , [320] , [321] , [322] are mostly used in photocatalytic hydrogen evolution or photodegradation of organic dyes and are rarely applied for the degradation of antibiotics. Nonetheless, 2D porous materials could be promising candidates for the photocatalytic treatment of antibiotics.…”

A 3D Hierarchical Pancake-Like Porous Carbon Nitride for Highly Enhanced Visible-Light Photocatalytic H2 Evolution

“…template-assistance strategies, topdown methods, and hydrothermal approaches have been regarded as representative and impelling strategies to fabricate multidimensional CN [44,45]. Nevertheless, these methods have many unsatisfactory deficiencies, such as a shortage of template species, large time consumption, and being environmentally unfriendly, resulting from the introduction of hazardous reagents, challenging the removal of the byproducts [46,47]. In contrast, the highly efficient photocatalysis materials benefited from the improved structure and accelerated the separation efficiency of photo-induced charge carriers, which is relatively convenient to obtain by a facile bottom-up method [48,49].…”