Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education, Jinan 250100, PR China.
Shandong Institute for Product Quality Inspection, Jinan 250100, PR China.
J Colloid Interface Sci. 2022 Nov;625:446-456. doi: 10.1016/j.jcis.2022.06.046. Epub 2022 Jun 15.
With the rapid development of economy and global industrialization, the problem of air pollution has become a worldwide topic. The efficient filtration of airborne particulate matters (PMs) is critical for human health and environmental sustainability.
Herein, self-supporting bio-based polyelectrolyte aerogels were prepared and acted as the advanced filters for efficient removal of PMs. The natural choline cation (Ch) or the organic cation, 1-butyl-3-methylimidazolium (Bmim), are introduced into alginate (Alg) to form the polyelectrolytes of ChAlg or BmimAlg due to the electrostatic interaction. By the directional freeze-drying in liquid N, hierarchically porous aerogels with mechanical robustness, flexibility and thermo-stability were prepared. This specific structure may permit the polluted air to pass adequately through the aerogel channels, which are conducive to intercept various PMs with different diameters.
As an example, the removal efficiency of ChAlg aerogels for PM, PM and PM are respectively up to (99.24 ± 0.03)%, (99.22 ± 0.02)%, and (93.41 ± 0.22)% within 15 h durability test. One outstanding character lies in ensuring high removal efficiency, while achieving a good balance with the low pressure drop (10 Pa), which is driven by synergistic effect of passive trapping and electrostatic capture. Moreover, the polyelectrolyte aerogels exhibit excellent antimicrobial activity and regenerated capacity. These properties endow the aerogels of polyelectrolyte ChAlg or BmimAlg with remarkable potential as new advanced filters for masks and other personal protective equipment.
随着经济的快速发展和全球工业化进程的推进，空气污染问题已成为全球性议题。空气中颗粒物（PMs）的高效过滤对于人类健康和环境可持续性至关重要。
在此，我们制备了自支撑的生物基聚电解质气凝胶，用作高效去除 PMs 的先进过滤器。天然胆碱阳离子（Ch）或有机阳离子 1-丁基-3-甲基咪唑鎓（Bmim）由于静电相互作用被引入海藻酸钠（Alg）中，形成聚电解质 ChAlg 或 BmimAlg。通过在液态 N 中定向冷冻干燥，制备了具有机械强度、柔韧性和热稳定性的分级多孔气凝胶。这种特殊结构可能允许污染空气充分通过气凝胶通道，有利于拦截不同直径的各种 PMs。
例如，ChAlg 气凝胶对 PM、PM 和 PM 的去除效率分别高达（99.24±0.03）%、（99.22±0.02）%和（93.41±0.22）%，在 15 h 耐久性测试中。一个突出的特点在于在保证高去除效率的同时，实现了低压降（10 Pa）的良好平衡，这是被动捕获和静电捕获协同作用的结果。此外，聚电解质气凝胶还表现出优异的抗菌活性和可再生能力。这些特性使聚电解质 ChAlg 或 BmimAlg 气凝胶具有作为新型先进口罩和其他个人防护设备过滤器的显著潜力。
