表面荷正电玻纤滤材的制备及其对水中纳米塑料过滤性能研究

Research on Preparation of Positively Surface-charged Glass Fiber Filter Materials and Their Filtration Performance for Nanoplastics in Water

关键词:  玻纤滤材  荷正电  纳米塑料  过滤效率  稳定性

Key Words:glass fiber filter materials  positively charged  nanoplastics  filtration efficiency  durability

摘要:本研究通过合成具有反应活性的季铵化聚乙烯亚胺（GPEI），并应用于玻纤滤材增强改性，获得表面荷正电的玻纤滤材并应用于水中纳米塑料的过滤。采用傅里叶变换红外光谱仪分析GPEI的化学结构，研究了GPEI上胶量和季铵化试剂用量对改性后玻纤滤材的物理性能和水中纳米塑料过滤性能的影响，探究了改性玻纤滤材过滤性能的持久稳定性。结果表明，当KH560∶PEI∶GTMAC物质的量比为6∶1∶1、GPEI上胶量为6.0%时，改性后表面荷正电玻纤滤材综合性能最佳，其抗张强度为0.789 kN/m，表面Zeta电位为+55.7 mV，对300 nm聚苯乙烯乳胶球颗粒物的过滤效率达97.3%，过滤阻力仅为6.2 kPa，在水中浸泡30天后，过滤效率仍能保持95.2%，具有良好的持久稳定性。

Abstract:In this study， reactive quaternized polyethyleneimine （GPEI） was synthesized and applied for the enhanced modification of glass fiber filter paper， resulting in positively charged glass fiber filter materials that were used for filtering nanoplastics in water. Fourier-transform infrared spectroscopy was employed to analyze the chemical structure of GPEI. The effects of GPEI coating amount and quaternization reagent dosage on the physical properties of the modified glass fiber filter materials and its filtration performance for nanoplastics in water were studied， the filtration durability of the positively charged glass fiber filter materials was also studied. The results showed that when the molar ratio of KH560∶PEI∶GTMAC was 6∶1∶1 and the GPEI coating amount was 6.0%， the modified positively surface-charged glass fiber filter materials exhibited optimal overall performance with a tensile strength of 0.789 kN/m， surface Zeta potential of +55.7 mV， filtration efficiency of 97.3% for 300 nm polystyrene latex particles， and filtration resistance of only 6.2 kPa. After 30 days of immersion in water， the filtration efficiency remained at 95.2%， demonstrating excellent filtration durability.