Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 9, Issue 6, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.106389
Keywords
photocatalysis; visible light; metal-free semiconductor; co-polymerization
Categories
Funding
- Maa-javesitekniikan tuki foundation
- Saint-Petersburg State University [32706707]
- Department of Industrial Engineering, Padova University [Progetto SGAR_SID17_01]
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A new visible-light active polymeric semiconductor was successfully fabricated by covalently functionalizing g-C3N4 with halogenated phenyl groups, leading to enhanced visible-light absorption and charge carrier separation. The functionalization extended the pore structure of g-C3N4, resulting in increased specific surface area and active sites, ultimately improving photocatalytic performance.
A new visible-light active polymeric semiconductor was fabricated covalently functionalizing the g-C3N4 using halogenated phenyl groups. 4-bromobenzonitrile was employed to introduce organic motifs into g-C3N4 networks through a convenient one-pot thermally induced process. The functionalization of the g-C3N4 with the halogenated phenyl group extended the original pi-conjugation system, leading to the enhancement of visible-light absorption, and the separation of charge carriers. Introducing the new group, the g-C3N4 pore structure was enriched, resulting in a larger specific surface area and an increase in active sites. The functionalization led to an easier exfoliation of the g-C3N4 framework into thinner layers, enhancing its dispersion ability in the water. Under visible-light irradiation, the as-prepared semiconductor exhibited increased photocatalytic activity to the pristine g-C3N4. The photocatalytic performances were investigated on a simple organic compound, methanol, a model dye, rhodamine B, and an emergent contaminant, 4-nitrophenol. This research provided new insights on metal-free modified g-C3N4 as a visible-light photocatalyst.
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