Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 302, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2021.120868
Keywords
b-N-TiO2; Ag3PO4; Defects; Heterojunction; Band structure; Algal cells
Funding
- Natural Science Foundation of Shanghai [21ZR1456700]
- Shanghai Sailing Program [21YF1440900]
- National Natural Science Foundation of China [42007147]
Ask authors/readers for more resources
A novel p-n heterojunction was successfully synthesized between Ag3PO4 and nitrogen-doped black TiO2, which exhibited enhanced photocatalytic activity for chlorophyll-a degradation. Mechanism exploration revealed the transfer pathways of photo-produced electrons and holes to generate the dominant superoxide anion radicals, providing new insights into the roles of defects in forming heterojunctions in photocatalytic composites.
A novel p-n heterojunction between Ag3PO4 and nitrogen-doped black TiO2 (b-N-TiO2) was successfully synthesized via the calcination and precipitation method. The incorporated nitrogen and produced oxygen vacancies in b-N-TiO2 narrowed the bandgap and shifted the band position of TiO2, which promoted p-n heterojunction formation and subsequently facilitated the separation of photogenerated electrons and holes in the composite bN-TiO2/Ag3PO4. The b-N-TiO2/Ag3PO4 exhibited enhanced photocatalytic activity for chlorophyll-a degradation in Microcystis aeruginosa cells, which was 2.73, 7.72, and 6.04 times higher than that of the pure Ag3PO4, b-NTiO2, and P25/Ag3PO4, respectively. Furthermore, the mechanism exploration indicated the transfer pathways of photo-produced electrons and holes to generate the dominant superoxide anion radicals (center dot O2-) in photocatalytic processes. The charge transfer increased the photocatalytic stability of the composite b-N-TiO2/Ag3PO4 compared with pure Ag3PO4 and P25/Ag3PO4. This research provides a new perspective into the roles of defects to form heterojunctions in photocatalytic composites.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available