Peroxymonosulfate-Assisted Phenol Degradation via a Magnetic Covalent-Triazine-Framework-Based Photocatalyst

Graphical We synthesized core-shell-structured nanospheres consisting of an Fe 3 O 4 core and a covalent triazine framework (TpMa) shell via a monomer-mediated in situ growth process. This nanocomposite was utilized as a heterojunction photocatalyst for the activation of peroxymonosulfate (PMS) in the degradation of phenol . Our findings indicate that the Fe 3 O 4 @TpMa core-shell structure promotes the utilization of light and activation of PMS, while SO 4 ⋅ − , ⋅OH, h + , O 2 ⋅ − , and 1 O 2 play crucial roles in the degradation of phenol. The development of efficient heterostructures combining covalent organic frameworks (COFs) and ideal semiconductors can significantly improve photocatalytic performance for pollutant degradation. Herein, we present the design, synthesis, and characterization of a core-shell-structured nanocomposite comprising covalent triazine framework-encased Fe 3 O 4 magnetic particles employed as a heterojunction photocatalyst for activating peroxymonosulfate (PMS) in phenol degradation. The distinctive internal structure between the TpMa shell (Tp=2,4,6-trihydroxy-1,3,5-benzenetricarboxaldehyde, Ma=melamine) and the Fe 3 O 4 core (Fe 3 O 4 @TpMa) facilitated charge transfer and accelerated charge separation. Furthermore, PMS served as an electron acceptor, enhancing photogenerated charge separation and maximizing the production of reactive oxygen species. The Fe 3 O 4 @TpMa/PMS system demonstrated remarkable photocatalytic performance and stability, achieving complete phenol degradation (10 mg L −1 ) in 40 min. The exceptional photocatalytic activity resulted from the synergistic effect of ⋅OH, SO 4 ⋅ − , O 2 ⋅ − , 1 O 2 , and h + generated in the Fe 3 O 4 @TpMa/PMS system during the degradation process. Overall, this material offers excellent potential for solar-driven pollutant degradation and enables the development of COF-based materials for wastewater treatment applications.