Three birds with one stone: Fe(Ⅲ)-coordinated cross-linked antibiofouling cellulose composite membrane for synergistic photodynamic and Fenton-like water disinfection
The development of green and highly efficient antimicrobial filter membranes for water disinfection is crucial to public health. Photodynamic therapy (PDT), an emerging bactericidal strategy, has shown significant potential for the preparation of antimicrobial filter membranes. Unfortunately, its antibacterial efficacy is often compromised by self-quenching caused by the aggregation of photosensitizers, as well as the short diffusion length and lifespan of the reactive oxygen species (ROS) generated. Herein, a Fe(Ⅲ)-coordinated cross-linked antibiofouling cellulose composite membrane (Fe/TOCNF-TPZnPc-1.5) with significantly enhanced synergistic photodynamic and Fenton-like bactericidal performance was fabricated via a facile flow-based sequential filtration method for water disinfection. The formation of a Fe(Ⅲ)-coordinated cross-link increases the structural stability of the membrane, prevents the migration and aggregation of tetra(4-carboxyphenoxy)-phthalocyaninatozinc (ii) (TPZnPc), and also provides the Fe(Ⅲ) complexes for the accelerated Fenton-like reaction. Through synergistic photodynamic and Fenton-like reactions, the Fe/TOCNF-TPZnPc-1.5 membrane achieves rapid and effective inactivation for E. coli and B. subtilis with a lethality rate of 100 % under NIR irradiation and H 2 O 2 treatment. The primary active species responsible for bacterial inactivation are singlet oxygen species ( 1 O 2 ) and hydroxyl radicals ( OH). The disinfection performance of the Fe/TOCNF-TPZnPc-1.5 membrane in river water samples demonstrated 100 % disinfection efficiency for waterborne pathogenic bacteria. In addition, the Fe/TOCNF-TPZnPc-1.5 membrane exhibits moderate water permeance (26.6 L m −2 h −1 ), high bacteria rejection (＞96 %), excellent antifouling ability, and 100 % biodegradation within 90 days. These attributes indicate significant potential for the practical application of this composite membrane in water purification.
危险品化学品经营许可证（带存储）