Nan Wang,Wangqiang Li,Yadong Ren,Jizhou Duan,Xiaofan Zhai,Fang Guan,Lifei Wang,Baorong Hou
Developing environmental and cost-effective antifouling technologies is essential to solve serious biofouling problems. Recently, enzyme mimics and halogenating enzymes have caught progressively attention as valuable tools to combat biofilm formation. In this work, the core-shell structure of CeO 2 @C, as one effective haloperoxidase-like enzyme mimics, was successfully synthesized using the carbon sphere as template through a simple coprecipitation method. Through the UV–vis absorption spectra and kinetic measurements, the CeO 2 @C displays intrinsic haloperoxidase-like activity via catalyzing the bromination of organic signaling compounds. Meanwhile, the prepared CeO 2 @C catalyst process high catalytic stability and recyclability, corresponding to a well catalytic performance repeatability after refresh of raw substrates (at least 10 times). The antibactrial property of CeO 2 @C as haloperoxidase mimicry is evaluated by immersing titanium plate/CeO 2 @C modified titanium plates into bacterial suspensions with different conditions for 4 h at 37 °C. It can catalyze the oxidation of Br − with H 2 O 2 to the corresponding hypobromous acid (HBrO), which exhibits strong antibacterial activity against Gram-negative ( Escherichia coli ), Gram-positive ( Staphylococcus aureus ) bacteria and typical marine ( Pseudomonas aeruginosa ) bacteria. This study introduces a stable, non-poisonous and inexpensive biomimetic material for antibacterial, antifouling and disinfection applications based on novel sustainable and conservation methods.
Hydrogels show great potential for marine antifouling, but their low mechanical strength and limited antifouling effectiveness hinder their broader application. Herein, the 3-sulfopropyl methacrylate potassium (SPMA) polymer brushes layer was grafted onto MXene, followed by in situ reduction to form silver nanoparticles (AgNPs) with an average particle size of about 10 nm. The resulting 0D/2D MXene-SPMA@Ag nanosheets exhibit effective antifouling capabilities, with antibacterial and algal removal rates exceeding 90 %. Meanwhile, composite antifouling hydrogels were developed by incorporating functionalized nanosheets into the hydrogel matrix. The incorporation of MXene-SPMA@Ag significantly enhanced mechanical strength, anti-swelling behavior, and friction reducing properties of the hydrogels. Compared to the blank hydrogel, the mechanical properties of the composite hydrogel were significantly improved, with the tensile strength increasing from 99 KPa to 238 KPa and the strain rising from 517 % to 861 %. In addition, MXene-SPMA@Ag/Gel showed excellent antifouling performance, with an antimicrobial activity approaching 100 % and an algae removal rate exceeding 90 %. These improvements were attributed to the synergistic effect between the MXene-SPMA@Ag nanosheets and the hydrogel.
危险品化学品经营许可证（带存储）