Strategy for improving photocatalytic ozonation activity of g-C3N4 by halogen doping for water purification

Recent advances of semiconductor photocatalysis for water pollutant treatment: mechanisms, materials and applications

“…This significantly promoted the separation and transfer of the photogenerated carriers, providing an effective pathway for transferring pollutants (BPA, sulfamethoxazole, ciprofloxacin (CIP), 2-chlorophenol (2-CP), and diphenhydramine) to the catalyst and promoting the production of O 2 ˙ − for further efficient degradation of the previous organic pollutants. Tan et al 68 evaluated the feasibility of doping halogens (Br, Cl, F, and I) to enhance the photocatalytic activity of g-C 3 N 4 to improve the degradation of a model pollutant, atrazine (ATZ). They concluded that the photochemical performance of all the halogen-doped materials was superior to that of the original g-C 3 N 4 , which was attributed to the C-halogen bond that reduced the forbidden bandwidth, in addition the doped halogens also enhanced the oxidation ability of h + and ˙OH in the degradation of ATZ to a certain extent.…”

Bridging Effect of Carbon Nitride with More Negative Conduction Potential and Halogens Promotes the Liquid-Phase Oxidation of Aromatic C–H Bonds

“…As nitrogen atoms in CN are rich in lone pair electrons, they can easily coordinate with metal heteroatoms to form surface traps near Ni that promote targeted electron transfer aggregation. , Based on this, we tried to dope halogens (F, Cl, Br, I) into the CN skeleton to establish hydrophobic potential-loving sites for a more inhomogeneous distribution of electrons on CN. Due to the difference of electronegativity, the doped halogens can make the electron transfer between s-triazine rings, which reduces the carrier recombination rate . Moreover, considering the high affinity of O 2 for hydrophobic regions and electron-rich sites, halogen can enhance the transfer of O 2 on the CN surface and improve the utilization of reactive oxygen species and electrons during the photocatalytic process. , In summary, Ni in the CN skeleton acts as a charge transfer bridge, connecting CN and Br to form a direct directed charge transfer path, which improves the photocatalytic performance of the catalyst.…”

Direct Z-scheme P–TiO2/g-C3N4 heterojunction for the photocatalytic degradation of sulfa antibiotics

“…However, the photocatalytic performance of g-C 3 N 4 is affected by its small specific surface area, fast electron–hole recombination rate and low visible light utilization rate. 29 In recent years, the photocatalytic performance of g-C 3 N 4 has been improved by using various approaches, such as element doping, 30 morphology control and surface modification. 29 The construction of heterojunctions can enable one to enhance the photocatalytic degradation activity of g-C 3 N 4 , 31 and the oxidation and reduction abilities can be enhanced by using composite materials with a more negative CB and more positive VB.…”