PDF(Pubmed)
Abstract：
Considering the high demand for air quality, the development of biomass-based air filtration membranes with high air filtration efficiency and good stability is an urgent task. In this work, polyvinyl alcohol (PVA), gelatin (GA), and cellulose nanocrystals (CNC) were mixed and prepared into a membrane through an electrospinning method for air filtration. After a hydrophobic modification, the modified PVA/GA/CNC composite membrane showed excellent filtration efficiency for PM2.5 (97.65%) through the internal three-dimensional structure barrier and the electrostatic capture effect of the CNC with a negative charge, as well as a low-pressure drop (only 50 Pa). In addition, the modified PVA/GA/CNC composite membrane had good mechanical properties (maximum tensile fracture rate of 78.3%) and high stability (air filtration efficiency of above 90% after five wash-filter cycles and a high-temperature treatment at 200 °C). It is worth noting that the whole preparation process is completed without organic solvents, putting forward a new strategy for the construction of green air filtration membranes.
摘要：
考虑到对空气质量的高要求，开发具有高空气过滤效率和良好稳定性的生物质基空气过滤膜是当务之急。在这项工作中,聚乙烯醇(PVA),明胶(GA),和纤维素纳米晶体（CNC）混合并通过静电纺丝方法制备成膜，用于空气过滤。疏水改性后，改性PVA/GA/CNC复合膜通过内部三维结构屏障对PM2.5(97.65%)表现出优异的过滤效率和带负电荷的CNC静电捕获效应,以及低压降（只有50Pa）。此外,改性PVA/GA/CNC复合膜具有良好的力学性能(最大拉伸断裂率为78.3%)和较高的稳定性(经过5次洗涤过滤循环和200℃高温处理后，空气过滤效率在90%以上)。值得注意的是，整个制备过程是在没有有机溶剂的情况下完成的，提出了绿色空气过滤膜建设的新策略。
