In this study, a novel structured amphiphilic modifier with crosslinked hydrophobic segments was synthesized and used to fabricate antifouling membranes. The amphiphilic modifier (MF-g-PEG n ) was synthesized by etherification of melamine formaldehyde (MF) prepolymer with polyethylene glycol (PEG), and blended in polyethersulfone (PES) matrix to prepare membranes via a nonsolvent induced phase separation method. The hydrophilic polyethylene oxide (PEO) segments in the modifier were enriched at membrane surface through spontaneous surface segregation, endowing membranes with improved antifouling properties. The hydrophobic MF segments in the modifier were entangled with PES chains for robust anchorage of PEO segments. Moreover, the presence of MF-g-PEG n reduced the thermodynamic stability of the casting solution, endowing the membranes with high porosity. The separation performance of membranes was evaluated using bovine serum albumin (BSA) aqueous solution as model system. During the filtration process, the flux recovery ratios (FRR) after BSA aqueous solution separation of the PES control membrane and PES/MF-g-PEG6000 (0.36 wt%) were 70.8% and 91.6% respectively. The pure water fluxes of membranes were improved from 60.7 L m −2 h −1 for the PES control membrane to 164.7 L m −2 h −1 for PES/MF-g-PEG6000 (0.36 wt%), and all the membranes possessed 100% rejection efficiency.
Di Hu,Ruru Xu,Yating Jin,Shuqing Sun,Jing Ye,Jiajia Wu,Zhiyuan Dai,Jia-Wei Shen,Yanbin Lu
In this study, a sustainable and environmentally friendly method was developed for the enrichment and purification of phycocyanin from Spirulina platensis . This was achieved by utilizing a temperature-sensitive polymer, Pluronic F68, in an aqueous two-phase solvent system. The phase behavior of the temperature-sensitive polymer-based biphasic system was evaluated. The extraction conditions were optimized by both single-factor experiments and response surface methodology. Under the optimal conditions, the upper polymer-rich phase was recycled for sustainable phycocyanin extraction, resulting in a grade of 3.23 during the third extraction cycle. Pluronic F68 could be efficiently recovered and reused during the extraction process. The interaction mechanism between Pluronic F68 and phycocyanin was systematically studied using FT-IR and fluorescence analysis. This was further complemented by static and dynamic calculation of molecular motion through molecular docking and molecular dynamics simulation, indicating that hydrophobic segment of Pluronic F68 played a key role in the binding process with phycocyanin.
危险品化学品经营许可证（带存储）