Marine antifouling materials based on fluorescence characteristics are the development trend for environmentally friendly marine antifouling coatings. Existing fluorescent antifouling materials face limitations such as limited functions and unclear mechanisms. A novel fluoranthene derivative was synthesized by Friedel–Crafts alkylation reaction, after which zinc acrylate resin containing the derivative was prepared. The results of the performance evaluation revealed that the inhibitory effect of the resin on algae growth was 28.4 %, and the antiadhesion effect increased by 72.7 %, which indicated that the resin had chemical repellent properties. Compared with that under the incubator light, the antiadhesion performance under sunlight increased by 52.4 %. The concentrations of photosynthetic pigments in the algae increased by 41.2 % (carotenoids), whereas the EPS decreased by 42.6 % (RPS) and 13.1 % (CPS). These results suggested that the fluorescence effect promoted the photosynthesis of algae and reduced the secretion of EPS. The actual sea antifouling test results confirmed that the resin has excellent antifouling effects because of its combination of fluorescence, chemical repellency and self-polishing properties. This study laid the foundation for the development of a multifunctional and environmentally friendly marine antifouling material belt.
Hydrogen-based membrane biofilm reactors using hollow-fiber membrane modules as their functional cores can play an important role in treating oxidizing pollutants. However, most studies have focused on pollutant removal, and few have investigated how membrane material properties affect reactor's operation. Here, we selected polyvinyl chloride (PVC) and polyvinylidene fluoride (PVDF) hollow fiber membrane materials with large differences in membrane surface properties to assemble the reactor, and investigated how the membrane properties affected nitrate removal and EPS secretion in MBfRs. The results showed that the membrane surface zeta potential and membrane contact angle had a certain positive impact on the NO 3 − -N removal rate and total EPS secretion in the MBfRs. When the contact angle (74.51–85.51°) and zeta potential (−12.5–4.5) increased, the biofilm on the membrane surface secreted more binding proteins (90.81–113.54 mg/gVSS), facilitating reactor biofilm growth, pollutant removal, and impact loads. Moreover, the properties of the experimentally selected PVC membrane material are more suitable for MBfR operation and are in line with the fundamental need for energy saving and emission reduction in modern society. This study provides a theoretical basis for the selection of membrane materials to enhance denitrification in H 2 -MBfRs, and an engineering foundation for reactors applications.
危险品化学品经营许可证（带存储）