Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 42
·22269-22279
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IF 11.301
Kangli Xu,Jixia Deng,Rui Lin,Heng Zhang,Qinfei Ke,Chen Huang
Nonwovens are widely applied in the air filtration field for their multi-layered fibrous structures and interconnected pores. Despite their intensive use, conventional microfiber nonwovens usually suffer from low filtration efficiencies due to their large pore size, while most nanofiber nonwovens are still confined within the laboratory due to the difficulties of reconciling the comprehensive requirements (such as low pressure drop, high fluffiness, strength and long-term reliability) raised from practical applications. Herein, we report a simple and scalable method that can generate more nanofibrils in a para-aramid microfiber nonwoven without interfering with the three-dimensional nonwoven structure. The success of this method relies on treating the whole nonwoven, rather than individual fibers, with phosphoric acid to trigger a surface fibrillation process of para-aramid microfibers. The structural reinforcement from microfibers, in combination with the enlarged surface area and the reduced pore size brought by nanofibrils, improves the filtration efficiency of the fibrillated nonwoven by 84.7% and maintains the pressure drop at an ultralow value of 3.5 Pa. Further synthesis and loading of a novel catalyst (CuO–CeO2) onto the nonwoven demonstrates a higher catalyst-loading capacity after fibrillation. The resulting nonwoven filter shows high elimination rates against a variety of solid and gaseous pollutants (including particulate matter, carbon monoxide and toluene), and is applicable at both room and elevated temperatures. We believe that the generation of nanofibrils in microfiber nonwovens and the subsequent loading of catalysts will find extensive utility in the purification of industrial emissions, automobile exhausts and indoor air.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yang Yang,Jifu Zhang,Jiajun Tang,Shanshan Li,Juming Yao,Guocheng Zhu,Baochun Guo,Parpiev Khabibulla,Ming Zhang
The escalating global industrialization has precipitated severe environmental crises, particularly from airborne particulate matter (PM) and oily wastewater discharges, which collectively threaten ecosystems and public health. The development of dual-functional separation materials capable of concurrently addressing airborne particulates and oily wastewater constitutes a significant scientific challenge in environmental materials engineering. Herein, based on the sequential electrospinning strategy, we engineered a composite fibrous membrane (CFM) featuring a vertical binary structure with polyacrylonitrile (PAN) nanofiber/net layer and polyvinylidene fluoride (PVDF) bead-on-string fibrous layer for high-performance filtration and superior oil/water mixtures separation. This architecture enables the CFM to achieve 99.35 % PM 0.3 capture efficiency at a low pressure drop (89.83 Pa) and exhibit outstanding durability, maintaining stable filtration efficiency under high particulate loading conditions exceeding 999 μg m −3 . Moreover, attributed to its surface wettability, the CFM demonstrates superb oil/water separation capability, achieving > 95 % separation efficiency with a maximum flux of 6660.66 L m −2 h −1 . Therefore, this work establishes a materials design strategy for developing fibrous membrane with high-performance and charming prospects to address both airborne particulate matter and oily wastewater contamination.
研究领域:
环境材料工程
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纳米技术
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膜科学
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空气污染控制
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水处理
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jiaxin Li,Jian Zhao,Zhe Xu,Yaling Zhai,Xiaolong Su,Dianfeng Luo,Chao Jia,Meifang Zhu
Currently, air pollution primarily arises from industrial emissions, coal combustion, and automobile exhaust, posing significant challenges for mitigation. This highlights the urgent need for advanced and efficient filtration materials with low pressure drop and high-temperature resistance. Traditionally, improving filtration property has involved increasing the thickness of the filtration materials, which consequently leads to higher costs. Here, dual-scale mullite nanofiber (MNF) films containing interwoven thick nanofibers (606 nm) and thin nanofibers (186 nm) are prepared using solution blow spinning. The dual-scale structure design enables the films to maintain a low pressure drop while achieving high filtration efficiency. At an airflow velocity of 5.3 cm s–1, the films with an areal density of 3.8 mg cm–2, achieve a filtration efficiency of 98.23% and a pressure drop of 141 Pa for PM0.3. In addition, the MNF films exhibit excellent flexibility and high-temperature resistance, making them have great potential for use in high-temperature flue gas filtration.
研究领域:
材料科学
·
环境工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jinmiao Chen,Shaohua Zhang,Yuejie Dou,Guangting Han,Na Wang,Zhenghai Qu,Chunguo Liu,Jiwei Li
The high humidity environment created by human breath can easily lead to charge loss in the mask's filter and weaken the mask's filtration effect on aerosols containing bacteria and viruses. Therefore, in this study, a breath moisture-induced electroactive nanofibrous membrane was prepared by incorporating Cu/Zn nanoparticles into cellulose acetate/poly (vinyl butyral) fibers. Adjacent Cu/Zn nanoparticles can form galvanic couples that can be activated by human breath to undergo redox discharge reactions, thus imparting moisture-induced electroactivity to nanofibrous membrane. Based on the moisture-induced electroactivity, nanofibrous membrane demonstrated antibacterial rates of 98.32 % against Escherichia coli ( E. coli ) and 99.06 % against Staphylococcus aureus ( S. aureus ). Moreover, moisture-induced electroactive nanofibrous membrane significantly reduced the titer of Enterovirus 71 (EV71) transmitted through the respiratory tract within 5 min. The excellent antibacterial and antiviral performance of electroactive nanofibrous membrane can be attributed to the synergistic effect of Cu/Zn’s electrical stimulation (ES) interference on the electrodynamics of bacteria and viruses, the generated reactive oxygen species (ROS), and the released metal ions. Benefiting from the increased surface potential from Cu/Zn galvanic couples, moisture-induced electroactive nanofibrous membrane exhibited a filtration efficiency of 99.61 % for PM 0.3 particles while maintaining a low-pressure drop (78 Pa). Meanwhile, electroactive nanofibrous membrane showed excellent wear comfort and non-cytotoxicity. In summary, this moisture-induced electroactive nanofibrous membrane maintains high filtration performance and exhibits excellent antibacterial and antiviral activities, shedding some light on developing novel efficient air filters.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
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