摘要
生物基可降解聚乳酸(PLA)纳纤膜(NFMs)可缓解塑料污染,并辅助改善空气质量,在颗粒物(PM)滤除领域备受关注,但其自身并不具备气体选择性,且因电活性不足与电荷耗散过快导致PM过滤效率不稳定,严重制约了其发展.本文采用微波辅助法制备了高选择活性纳米晶(HSANs),通过电纺电喷联用策略将其掺杂到PLA NFMs中,最终形成具有多级孔结构的高选择活性纳纤膜(HAS NFMs).借助HSANs(2%,4%和8%,质量分数)的均匀负载作用,所得HSA NFMs的表面电位(最高达7.6 kV)和介电常数(1.68)均显著提升.同时,凭借显著增强的电活性与优化后的形态结构,HSA NFMs在85 L/min气流速度下对PM_(2.5)和PM_(0.3)的过滤效率分别达到99.8%和99.5%,显著优于Pure PLA(仅分别为83.5%和82.7%).此外,HSA NFMs表现出优异的二氧化碳(CO_(2))吸附性能,其中HSA-8在273.15 K/1.0 bar(1 bar=100 kPa)条件下的吸附容量高达57.2 cm^(3)/g,并通过理想吸附溶液理论(IAST)模拟得到CO_(2)/N_(2)选择性为40.该策略实现了高效CO_(2)选择性吸附与卓越PM过滤性能的有机整合,有望推动环境友好型同步滤除分离功能膜的发展.
Biodegradable poly(lactic acid)(PLA)nanofibrous membranes(NFMs)can alleviate plastic pollution,aid in air quality improvement,and have gained significant attention in particulate matter(PM)filtration.However,they inherently lack gas selectivity;moreover,insufficient electroactivity and rapid charge dissipation lead to unstable PM filtration efficiency,which seriously restricts their development prospects.Herein,we employed a microwave-assisted method to fabricate high-selectivity active nanocrystals(HSANs),which were then integrated into PLA NFMs using a combined electrospinning⁃electrospray strategy,resulting in high-selectivity active(HSA)NFMs with a hierarchical porous structure.With the uniform,affinitive anchoring of HSANs(2%,4%and 8%,mass fraction),the HSA NFMs thus obtained showed a significant increase in surface potential(up to 7.6 kV)and dielectric constant(1.68).Meanwhile,endowed with pronounced activity and optimized morphology,HSA NFMs exhibited PM_(2.5) and PM_(0.3) filtration efficiencies of 99.8%and 99.5%at 85 L/min,markedly outperforming Pure PLA(only 83.5%and 82.7%,respectively).Moreover,the prepared HSA NFMs exhibited excellent CO_(2) adsorption performance.Specifically,HSA-8 achieved the highest capacity of 57.2 cm^(3)/g at 273.15 K/1.0 bar(1 bar=100 kPa),and its CO_(2)/N_(2) selectivity of 40 was confirmed via ideal adsorbed solution theory(IAST)simulation.The proposed methodology exhibits an outstanding integration of high-efficiency CO_(2) capture and superior air filtration,which may facilitate the development of eco-friendly and functional protective membranes.
作者
户书达
董丽宁
王存民
李欣雨
汪少振
李世航
张生辉
徐欢
HU Shuda;DONG Lining;WANG Cunmin;LI Xinyu;WANG Shaozhen;LI Shihang;ZHANG Shenghui;XU Huan(Carbon Neutrality Institute,China University of Mining and Technology,Xuzhou 221116,China;School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China;School of Materials Science and Physics,China University of Mining and Technology,Xuzhou 221116,China)
出处
《高等学校化学学报》
北大核心
2026年第2期145-154,共10页
Chemical Journal of Chinese Universities
基金
江苏省自然科学基金青年项目(批准号:BK20241648)
中国博士后科学基金(批准编号:2024M763559)
国家自然科学基金(批准号:52174222,52573054)资助。
关键词
纳纤膜
高选择活性纳米晶
同步滤除
选择性吸附
Nanofibrous membrane
Highly selective active nanocrystal
Simultaneous filtration and removal
Selective adsorption
