Enhanced Antibiofouling and Corrosion Resistance of CeO₂-Functionalized Polydopamine-Modified Two-Dimensional Zeolitic Imidazole Framework-7 (2D ZIF-7) Nanosheets

Biofouling has been a persistent challenge for offshore equipment, significantly affecting its longevity. In this study, two-dimensional (2D) ZIF-7 nanosheets were synthesized via a hydrothermal method and modified with polydopamine (PDA) to enhance their dispersibility. A multifunctional ZIF-7@PDA-CeO₂ nanocomposite was then prepared through in situ growth, where CeO₂ was uniformly and securely anchored onto the ZIF-7@PDA surface, facilitated by the large specific surface area and its electrostatic interactions between ZIF-7@PDA. UV-vis absorption spectra demonstrate that the ZIF-7@PDA-CeO₂ exhibit haloperoxidase-like (HPO-like) catalytic activity, efficiently catalyzing the oxidation of NH₄Br and H₂O₂ to generate HBrO. Antibacterial assays indicate that ZIF-7@PDA-CeO₂ possesses strong bactericidal activity and effectively inhibits biofilm formation. Furthermore, ZIF-7@PDA-CeO₂ are used as fillers to prepare ZIF-7@PDA-CeO₂/EP composite coating, and the antibacterial and long-term corrosion resistance is also explored. We believe this work offers a sustainable solution to the challenges of biofouling and corrosion in marine environments.