Kang Hua, Niu Lin, Zhang Fan, Qing Chenglin, Dong Mingdong, Guan Li, Zhang Meining, Liu Zheng
School of Chemistry and Life Resources, Renmin University of China, Beijing 100872, China.
Laboratory of Flexible Electronics Technology, Key Laboratory of Organic Optoelectronics & Molecular Engineering, Ministry of Education, Department of Chemistry, State Key Laboratory of Tribology in Advanced Equipment (SKLT), Laboratory of Flexible Electronics Technology, Tsinghua University, Beijing 100084, China.
ACS Appl Mater Interfaces. 2024 Oct 9;16(40):54566-54573. doi: 10.1021/acsami.4c10922. Epub 2024 Sep 30.
Serious haze pollution, mainly caused by fine and ultrafine particulate matters (PMs) and aerosols, poses a significant threat to the public health, especially when the aerodynamic diameter is less than 2.5 μm. Electrostatic capture techniques, such as polymer electret filters and kinetic plasma processes, are widely used instead of mechanical filtration with high removal efficiency and low wind resistance (pressure drop). However, the inability to recharge, coupled with the generation of ozone byproducts, makes it challenging to meet the requirements for both recoverability and highly efficient filtration. Here, we propose an electrostatic filter as an alternative to conventional polymer electrets, aiming to achieve an ultrahigh removal efficiency, long-term performance stability, and reusability. Piezoelectric LiNbO (LN) particles are integrated into the polypropylene (PP) matrix through the melt-blown strategy to fabricate the LN/PP nonwoven fabric. Benefiting from the employment of piezoelectric LN particles, the LN/PP nonwovens exhibit an ultrahigh removal efficiency of 99.9% for PM to PM. The airflow facilitates the sustained regeneration of piezoelectric charges on the surface of LN/PP nonwovens, thereby maintaining a removal efficiency of approximately 95% for continuous filtration over 11 days. Even after eight cycles of washing, the removal efficiency of the LN/PP nonwovens remains at nearly 90%, demonstrating the excellent reusability. Our proposed strategy offers an ingenious combination of high-efficiency and recoverability for filters, holding great promise for reducing plastic pollution.
严重的雾霾污染主要由细颗粒物和超细颗粒物（PMs）以及气溶胶引起，对公众健康构成重大威胁，尤其是当空气动力学直径小于2.5μm时。静电捕获技术，如聚合物驻极体过滤器和动力学等离子体工艺，因其具有高去除效率和低风阻（压降）而被广泛应用，以替代机械过滤。然而，无法再充电以及产生臭氧副产物，使得难以满足可回收性和高效过滤的要求。在此，我们提出一种静电过滤器作为传统聚合物驻极体的替代品，旨在实现超高去除效率、长期性能稳定性和可重复使用性。通过熔喷策略将压电LiNbO（LN）颗粒集成到聚丙烯（PP）基体中，以制备LN/PP无纺布。得益于压电LN颗粒的应用，LN/PP无纺布对PM到PM的去除效率高达99.9%。气流有助于LN/PP无纺布表面压电电荷的持续再生，从而在连续过滤11天内保持约95%的去除效率。即使经过八次洗涤循环，LN/PP无纺布的去除效率仍保持在近90%，显示出优异的可重复使用性。我们提出的策略为过滤器提供了高效性和可回收性的巧妙结合，在减少塑料污染方面具有巨大潜力。
