3D flower-like Ag/Bi5O7I embedded on an acrylate fluoroboron polymer as a multifunctional assembly film for ultrastable plasmon-enhanced photocatalysis and antibiosis

Highlights: • A novel Bi₅O₇I/Ag/acrylate fluoroboron polymer ternary assembly film is fabricated. • The co-catalysts of Ag and fluoropolymer promote the charge separation. • It exhibits excellent anti-diatom, antibacterial and degradation activity. • It is due to synergistic effect of photocatalytic coupling self-updating. Flower-like Bi₅O₇I microspheres modified with Ag nanoparticles are prepared, exhibiting excellent surface plasmon resonance. Bi₅O₇I/Ag/acrylate fluoroboron polymer (AFBP) ternary assembly films are also fabricated using Bi₅O₇I/Ag composites uniformly distributed in acrylate fluoroboron polymer. The structure and photocatalytic properties of Bi₅O₇I/Ag are characterized. Characterization results indicate that Bi₅O₇I/Ag has a large specific surface area, a low band gap, and excellent visible light response. To evaluate the properties of the Bi₅O₇I/Ag/AFBP ternary assembly film, laboratory diatom assays and antibacterial activity are tested. The results show excellent diatom anti-settlement performance and high antibacterial rates of 99.63% for Escherichia coli and 99.92% for Staphylococcus aureus. Photocatalytic degradation of 2,4,6-trichlorophenol by visible-light irradiation for 150 min shows a removal rate of 95%, which is attributed to charge efficiency separation. Simultaneously, the photodegradation pathway and TOC of 2,4,6-trichlorophenol are analyzed. Thus, this study shows the significance of assembly film for potential marine applications in the future.