Global water shortages have significantly intensified the demand for efficient and sustainable water purification technologies. Nanofiltration (NF) plays a crucial role in desalination, providing distinct advantages by removing a variety of pollutants including heavy metals and organic compounds, all while consuming minimal energy. Traditional NF membranes often struggle to balance high rejection with satisfactory permeability. This study advances NF technology by utilizing polysulfone as a durable substrate and introducing tannic acid (TA)-polyvinyl alcohol (PVA) interlayer to enhance structural robustness and functional capabilities of membranes. Through streamlined one-step coating followed by precise interfacial polymerization, this approach optimizes monomer piperazine storage and dispersion on substrate, effectively controlling its diffusion rate, resulting in a thinner polyamide (PA) layer. These strategic enhancements not only lead to a significant increase in permeability to 216.3 L·m −2 ·h −1 ·MPa −1 and an impressive rejection for Na 2 SO 4 of 99.04 % but also ensure enhanced long-term operational stability. The innovative TA-PVA interlayer sets new benchmarks for high-performance NF membranes by combining environmental friendliness with cost-effectiveness, making it ideal for large-scale industrial applications. This unique composition promotes sustainability and economic efficiency in water treatment technologies, and underscoring the vast potential for expanding the production and application of advanced NF systems.
Yanling Liu,Junyong Zhu,Junfeng Zheng,Xiaoqi Gao,Miaomiao Tian,Xiaomao Wang,Yuefeng F. Xie,Yatao Zhang,Alexander Volodin,Bart Van der Bruggen
Porous organic polymers have been considered promising for the design of high performing membranes, mainly because of their superior surface area, intrinsic mesoporous structure and good polymer affinity. In this study, hierarchical o -hydroxyazo porous organic polymers (o-POPs) and piperazine (PIP) monomers were incorporated into the casting solution, followed by phase inversion to prepare PIP-containing polymeric substrates. The o-POPs modified thin film nanocomposite (TFN) membranes were fabricated by interfacial polymerization (IP) with trimesoyl chloride (TMC). The incorporated o-POPs could locally enrich PIP in substrates and impede its diffusion towards the organic interface during IP reaction through hydrogen bonding and physical obstruction, leading to the formation of a crumpled membrane surface. The enhancement of surface roughness and hydrophilicity endowed the TFN membranes with a signally elevated water permeance while maintaining a comparable solute rejection. The optimal TFN membrane with the o-POP content of 0.3 wt% displayed a remarkable water permeance of 29.6 L m −2 h −1 bar −1 , a high Na 2 SO 4 rejection of 94.9%, and an efficient removal of reactive dyes (e.g., reactive black 5 and reactive orange 16, >98.2%), which makes o-POP functionalized TFN membranes competitive for NF applications in water treatment.
危险品化学品经营许可证（带存储）