Embedding Aromatic Conjugated Monomer within Carbon Nitride for Efficient Photocatalytic Reduction Reactions

Due to a growing number of significant vitality and environmental issues, the standardized variation of carbon nitride (CN) for visible-light photocatalytic water splitting is an encouraging scientific topic. By revealing this, the functionalized monomer 2,6-dibromobenzimidazole (BI) was successfully embedded within the heptazine units of CN via a molecular engineering (Co-polymerization process) approach, and the as-synthesized product was named CN/BIx. Thereafter, as-synthesized materials were employed in the photocatalytic production of hydrogen (H-2) via water splitting and CO2 reduction into CO under visible light irradiance (lambda = 420 nm). Surprisingly, the substituent framework of CN, which was intimi-dated by the description of BI monomer, acted as a substitution reaction material and lubricated the elec-tronic structure of CN by endorsing charge transition dissociation, which in turn boosted its photocatalytic performance under visible irradiation. The CN/BI10.0 yields 62.8 mol of CO and 18.1 mol of H-2 for 4 h of the catalyzed reaction upon photooxidation under light irradiation, emphasizing the max-imum photocatalytic performance with response to CO2-+ Correspondingly, the H-2 evolution rate (HER) for bulk CN was estimated as 17.6 mol/h(1), whereas it was approximated as 203.7 mol/h(1) for CN/BI10.0, which is 10 times higher than that of CN. Such a phenomenon also predicts a substantial encroachment in the surface area, energy gap, and chemical properties, along with promotes the effective segregation of pho-toinduced charge separation from the valence band (VB) to the conduction band (CB) of CN, thereby, making it a good alternative for the photocatalytic water and CO2 reduction reaction process. (c) 2022 Elsevier B.V. All rights reserved.

Automated summary

The standardized variation of carbon nitride (CN) for visible-light photocatalytic water splitting is an important scientific topic due to the growing vitality and environmental issues. By embedding the functionalized monomer into CN via molecular engineering, the photocatalytic performance of CN under visible light irradiation is boosted, making it a promising alternative for water and CO2 reduction reactions.