SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Qian Geng,Senjie Dong,Yajian Li,Huizhi Wu,Xiao Yang,Xin Ning,Ding Yuan
Design and fabrication of highly efficient and multifunctional nanofiber membranes for biological protection and environmental conservation has attracted wide attention. Herein, a unique bimodal fiber diameter distributed polyvinylidene fluoride (PVDF) composite membrane decorated by zeolitic imidazolate framework-8 (ZIF8) featuring favorable antibacterial activity was successfully prepared for efficient particulate matter (PM) capture and oil–water separation via a simple and feasible electrospinning process. Benefiting from the metal ions (Zn 2+ ) and organic ligands released by ZIF8, particularly the generated reactive oxygen species (ROS) under photoexcitation, the composite membrane presented strong bactericidal activity against Staphylococcus aureus ( S. aureus ) and Gram-negative Escherichia coli ( E. coli ). More impressively, owing to the effective drug loading capacity of ZIF8, the cefixime-encapsulated nanofiber membrane further exhibited remarkably enhanced antibacterial properties. Meanwhile, composite membrane achieved superior capture efficiency (99.90 ± 0.05 %) for PM 0.3 and high purification ability (99.40 ± 0.10 %) for PM 2.5 in real smoke environment under the combined effect of the strong surface charge on ZIF8 surface, high polarity of β-phase in PVDF, and ultrafine fibers, etc.; it also possessed excellent separation ability for water-in-oil emulsion and oil–water mixture due to the distinguished selective wettability, three dimensional porous structure and the enhanced demulsification performance of ZIF8. This multifunctional filtration/separation composite membrane emerges great potential in the fields of biological protection, air pollution control and oil–water separation.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
Nanotechnology and Precision Engineering
·
2021
·Vol. 4
·期 1
·
IF 0
Li Yanna,Fu Muqing,Pang Wei,Chang Ye,Duan Xuexin
Ambient suspended particulate matter (PM) (primarily with particle diameter 2.5 µm or less, i.e., PM2.5) can adversely affect ecosystems and human health. Currently, optical particle sensors based on light scattering dominate the portable PM sensing market. However, the light scattering method has poor adaptability to different-sized PM and adverse environmental conditions. Here, we design and develop a portable PM sensing microsystem that consists of a micromachined virtual impactor (VI) for particle separation, a thermophoretic deposition chip for particle collection, and an extended-gate field-effect transistor (FET) for particle analysis. This system can realize on-site separation, collection, and analysis of aerosol particles without being influenced by environmental factors. In this study, the design of the VI is thoroughly analyzed by numerical simulation, and mixtures of different-sized silicon dioxide (SiO 2 ) particles are used in an experimental verification of the performance of the VI and FET. Considering the low cost and compact design of the whole system, the proposed PM analysis microsystem has potential for PM detection under a wide range of conditions, such as heavily polluted industrial environments and for point-of-need outdoor and indoor air quality monitoring. A proposed microsystem system potentially provides accurate and calibration-free measurements based on a combination of front-end particulate matter (PM) separation and back-end PM detection. Silicon dioxide particles are used to verify the performance of the system’s virtual impactor, and an accurate cutoff diameter of 2 μm in low air flow rates can be obtained. Experimental results suggest that the proposed microsystem has potential for accurate real-time analysis of PM pollution under complex conditions.
研究领域:
环境科学
·
微纳米技术
·
传感器技术
✓ 已验证
产品关联
DOI
Materials
·
2021
·Vol. 14
·期 24
·7853
·
IF 3.623
Yan Luo,Zhongyun Shen,Zhihao Ma,Hongfeng Chen,Xiaodong Wang,Minger Luo,Ran Wang,Jianguo Huang
A silicon dioxide/polytetrafluoroethylene/polyethyleneimine/polyphenylene sulfide (SiO2/PTFE/PEI/PPS) composite filter medium with three-dimensional network structures was fabricated by using PPS nonwoven as the substrate which was widely employed as a cleanable filter medium. The PTFE/PEI bilayers were firstly coated on the surfaces of the PPS fibers through the layer-by-layer self-assembly technique ten times, followed by the deposition of SiO2nanoparticles, yielding the SiO2/(PTFE/PEI)10/PPS composite material. The contents of the PTFE component were easily controlled by adjusting the number of self-assembled PTFE/PEI bilayers. As compared with the pure PPS nonwoven, the obtained SiO2/(PTFE/PEI)10/PPS composite material exhibits better mechanical properties and enhanced wear, oxidation and heat resistance. When employed as a filter material, the SiO2/(PTFE/PEI)10/PPS composite filter medium exhibited excellent filtration performance for fine particulate. The PM2.5 (particulate matter less than 2.5 μm) filtration efficiency reached up to 99.55%. The superior filtration efficiency possessed by the SiO2/(PTFE/PEI)10/PPS composite filter medium was due to the uniformly modified PTFE layers, which played a dual role in fine particulate filtration. On the one hand, the PTFE layers not only increase the specific surface area and pore volume of the composite filter material but also narrow the spaces between the fibers, which were conducive to forming the dust cake quickly, resulting in intercepting the fine particles more efficiently than the pure PPS filter medium. On the other hand, the PTFE layers have low surface energy, which is in favor of the detachment of dust cake during pulse-jet cleaning, showing superior reusability. Thanks to the three-dimensional network structures of the SiO2/(PTFE/PEI)10/PPS composite filter medium, the pressure drop during filtration was low.Keywords:polytetrafluoroethylene;polyphenylene sulfide;filter medium;PM2.5;layer-by-layer self-assembly
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Zhefu Wu,Qing Su,Jie Yang,Zhimei Wei,Gang Zhang
Particulate matter 2.5 (PM 2.5 ) has become a major threat to human lives. To minimize the adverse effect of high temperature PM 2.5 , the best way is to alert and filter out the PM 2.5 simultaneously. However, it remains a challenge to design filters with combined merits of high-performance, fire-retardancy and thermal response. In this work, we prepare the thermochromic luminous polysulfone membrane with high-temperature PM 2.5 filtration and alarming property. The dual luminous center containing covalent donor–acceptor (DA) structure and metal–ligand interaction are incorporated and electrospun into structure unified nanofibers. And different thermal responsiveness is observed for the dual luminous center. The high PM 2.5 filtration efficiency (99.1%), low pressure drops (98 Pa) and heat-resistant (T g > 236 °C) membrane can be directly applied on an in-situ high-temperature PM 2.5 filtration and monitoring device, with the emission color variable from red to cyan in a wide range. More importantly, PBN composite filters show excellent flame retardancy in comparison with the commercial PE fabrics, and the color indicating property functions well even under fire. Therefore, the PBN composite membrane holds great potential in the fields of high-temperature PM 2.5 filtration and fire alarming.
研究领域:
材料科学
·
环境科学
·
纳米技术
·
消防安全工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Tongling Xia,Chun Chen
Because of the relatively low pressure drop and high particle removal efficiency, nanofiber filter media can be potentially used for indoor particulate air pollution control. However, the influence of particle loading on the long-term performance of nanofiber filters in indoor particle control has not been well studied. This study first experimentally investigated the relationship between the pressure drop and solid particle loading mass for 42 nanofiber filter samples under various face velocities. The results show that the air resistance coefficient increased with the solid particle loading mass for the nanofiber filter media. Furthermore, the air resistance coefficient was positively associated with the face velocity, as a higher air velocity tended to make the particle cake tighter with higher resistance. Based on the experimental data, a semi-empirical equation was developed for predicting the pressure drop under different particle loading masses and face velocities. The developed semi-empirical model was then used to assess the long-term performance of an air cleaner equipped with nanofiber filter media in indoor PM 2.5 control. The case study demonstrated that an air cleaner equipped with nanofiber filter media could effectively control indoor PM 2.5 , but the lifetime of the nanofiber filter was shorter than that of traditional HEPA filters.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Yingchun Su,Zhijia Zhang,Zegao Wang,Menglin Chen,Mingdong Dong,Xiaojun Han
The necklace-like fiber membranes are fabricated using electrospinning technique for high-efficiency PM (particulate matter) capture. Poly- N , N ′-[(4,5-dihydroxy-1,2 phenylene)bis(methylene)]bisacrylamide (POHABA) nanospheres as “pearls” are embedded in poly(ethylene oxide) (PEO) and poly(vinylpyrrolidone) (PVP) matrix substrates to make necklace-like fibers. The reason for choosing POHABA nanospheres is due to their broad-spectrum inhibitory effect on bacteria. The diameters of three POHABA nanospheres are controlled to be 190 ± 50, 364 ± 39 and 467 ± 65 nm, respectively. The necklace-like structures become more pronounced with the increase of POHABA diameter. The PM 2.5 removal efficiencies of PEO necklace-like fiber membranes obtained with electrospinning time of half an hour are in the range from 88.0 to 92.5%. Under the same fabrication conditions, the PEO/POHABA-467 fiber membrane displays better capture efficiency than that of PVP/POHABA-467 fiber membrane. Using thicker PEO/POHABA-467 filter membrane (electrospinning for one hour), excellent removal efficiency of PM 2.5 (99.2%) is achieved, which is better than that obtained from other membranes and even commercial QMA filter (Whatman). The necklace-like fiber membranes have a great potential in the fields of aero filter and mask.
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
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Jianfei Liu,Min Li,Pei Wang,Kaiqiang Liu,Yu Fang
In this work, a series of porous polymeric monoliths with densities as low as ∼0.060 g/cm 3 were prepared by employing some newly created gel-emulsions as templates, of which acidified cotton was utilized for the first time as an efficient stabilizer. The monoliths as obtained could be purified by simple washing and dried at ambient conditions. Moreover, they showed strong affinity to particulate matters (PMs). Adsorption tests revealed that the saturated adsorption capacity of one of the monoliths (M8) to PM 2.5 could reach ∼520 mg/g and the removal efficiency exceeds 93% at ambient conditions, a prominent result considering the collective advantages of the monolith. Importantly, the monoliths after adsorption can be recovered and re-used via simple washing and drying. More importantly, the stabilizer as created is so efficient that 0.1% ( w / v , cotton to the volume of the continuous phase) is enough to stabilize the gel emulsions. Considering the excellence in performance, low cost in preparation, and convenience in regeneration, we believe that the monoliths are strong candidates for real-life applications.
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
Polymers
·
2024
·Vol. 16
·期 2
·209
·
IF 4.7
Huanliang Liu,Wenqing Lai,Yue Shi,Lei Tian,Kang Li,Liping Bian,Zhuge Xi,Bencheng Lin
Rapid social and industrial development has resulted in an increasing demand for fossil fuel energy, which increases particulate matter (PM) pollution. In this study, we employed a simple one-step electrospinning technique to fabricate polysulfone (PSF) fiber membranes for PM filtration. A 0.3 g/mL polymer solution with anN,N-dimethylformamide:tetrahydrofuran volume ratio of 3:1 yielded uniform and bead-free PSF fibers with a diameter of approximately 1.17 μm. The PSF fiber membrane exhibited excellent hydrophobicity and mechanical properties, including a tensile strength of 1.14 MPa and an elongation at break of 116.6%. Finally, the PM filtration performance of the PSF fiber membrane was evaluated. The filtration efficiencies of the membrane for PM2.5and PM1.0were approximately 99.6% and 99.2%, respectively. The pressure drops were 65.0 and 65.2 Pa, which were significantly lower than those of commercial air filters. Using this technique, PSF fiber membrane filters can be easily fabricated over a large area, which is promising for numerous air filtration systems.
研究领域:
环境科学
·
材料科学
·
空气过滤技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 9
·1806
·
IF 4.324
Dawei Li,Huizhong Liu,Ying Shen,Huiping Wu,Feng Liu,Lanlan Wang,Qingsheng Liu,Bingyao Deng
Electrospun nanofiber, showing large specific area and high porosity, has attracted much attention across various fields, especially in the field of air filtration. The small diameter contributes to the construction of filters with high-filtration efficiency for fine particulate matter (PM), however, along with an increase in air resistance. Herein, composited nanofiber aerogels (NAs), a truly three-dimensional (3D) derivative of the densely compacted electrospun mat, were constructed with the blocks of polytetrafluoroethylene–polyamideimide (PTFE–PAI) composite nanofiber and polyimide (PI) nanofiber. PI/PTFE–PAI NAs with hierarchically porous architecture and excellent mechanical properties have been obtained by thermally induced crosslink bonding. Results indicated that sintering at 400 °C for 30 min could complete the decomposition of polyethylene (PEO) and imidization of polyamic acid (PAA) into PI, as well as generate sufficient mechanical bonding between adjacent nanofibers in the NAs without extra additive. The well-prepared PI/PTFE–PAI NAs could withstand high temperature up to 500 °C. In addition, the filtration tests illustrated that the composite NAs had an excellent performance in PM filtration. More importantly, the filtration behavior could be adjusted to meet the requirements of various applications. The excellent thermal stability and high-filtration efficiency indicated its great potential in the field of high-temperature air filtration.Keywords:nanofiber-based aerogels;PTFE–PAI nanofiber;high-efficiency filter;PM2.5;hierarchical porous architecture
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Mengyan Chen,Jiayu Jiang,Shasha Feng,Ze-Xian Low,Zhaoxiang Zhong,Weihong Xing
The functionalization of nanofibrous membranes (NFMs) is a prevailing and promising strategy to prepare highly efficient air filters for high-precision filtration. Graphene oxide (GO), due to its functional chemical groups, high mechanical properties , electrical conductivity , and excellent compatibility, has been widely applied in modification of polymer materials. In this work, two-dimensional graphene oxide (GO) nanosheets are introduced into PVDF NFMs through the use of the GO/PVDF blending-electrospinning and GO@PVDF surface coating methods to prepare a highly efficient air filter, respectively. Different GO loadings lead to NFMs with diverse surface properties, static electricity, nanofiber diameters, and air filtration performances. The basic properties, filtration performance and effects of the GO loading strategies of the optimized GO/PVDF and GO@PVDF NFMs are systematically compared and analyzed. In general, blending GO in a PVDF solution before electrospinning may significantly enhance the spinnability and static electricity. Meanwhile, GO with lamellar structure is of great benefit to provide the nucleation basis for β-PVDF, which can significantly endow the membrane with good particle capture capacity. The obtained GO/PVDF NFMs show a higher PM 2.5 removal efficiency of 99.31% and better reusability than the pristine PVDF NFMs (93.74%) and GO@PVDF NFMs (95.41%). This work reveals that blending GO in an electrospinning solution is a practical modification technique to prepare a high-efficiency air cleaning membrane.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Industrial Textiles
·
2022
·
IF 2.926
Yang Lei,Rong-Rong Cai,Rui-Qi Lin,Li-Zhi Zhang
Face masks are commonly used to protect an individual’s respiratory system from inhaling fine particulate matter (PM2.5) in polluted air, as well as the airborne pathogens, especially during the ongoing coronavirus disease 2019 (COVID-19) pandemic. However, all conventional masks with anti-PM2.5 function suffer from insufficient facial thermal comfort, particularly in a hot and humid environment. Herein, we demonstrated a novel infrared-transmittance visible-opaque PM2.5 media for radiative cooling utilizing rutile titanium dioxide particle-embedded polyamide 6 (PA6-TiO2). The transmission of visible light and infrared and PM2.5 removal performance of composite media containing a variety of microstructures, such as TiO2 particles of varying sizes, shapes, and contents, were numerically examined to determine the optimal ranges. Then the PA6-TiO2 media was effectively electrospun by controlling the arrangement of fibers and the morphology of TiO2 particles. By transmitting more than 85% of the thermal radiation from the human body and selectively blocking solar irradiance, the developed PA6-TiO2(flower-shaped) media cooled the simulative skin by 10.3°C as compared with commercial masks under strong solar irradiance. Additionally, they demonstrated a high PM2.5 removal efficiency of 95.3%, a low air resistance of 22.5 Pa (at 5.3 cm/s), and a sound water vapor transmission rate of 0.0169 g cm−2 h−1. This study presents an effective strategy for making thermally comfortable anti-PM2.5 masks, which will significantly benefit the public health prevention and control.
研究领域:
材料科学
·
环境科学
·
公共卫生
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2025
·
IF 14.1
Yongjian Li,Jinlong Xu,Zujie Gao,Haosheng Chen
PM 2 . 5 translocated across the air-blood barrier (ABB) can accumulate in the lungs and extrapulmonary organs, leading to both pulmonary and systemic pathophysiological effects. However, the mechanisms governing the translocation of micron-sized PM 2 . 5 (MPs) remain unclear. Here, a physiologically relevant in vitro ABB model is developed, comprising a triple co-culture system under respiratory-like cyclic strain. Using this platform, it is demonstrated that cyclic stretching enhances dTHP-1 phagocytosis and transmigration, synergistically promoting macrophage-mediated MPs translocation across the ABB in combination with strain-induced disruption of epithelial tight junctions. This cooperative mechanism governs MPs translocation across the ABB and markedly increases the transport of 2 µm particles compared to static conditions. By using scavenger receptor A (SR-A) inhibitors, this process are confirmed to be predominantly driven by macrophage phagocytosis. Furthermore, this study explores the potential fate of particles post-translocation, proposing their subsequent release from macrophages via active lysosomal exocytosis and passive release mediated by cell death. These findings provide new insights into mitigating PM 2 . 5 -induced health risks and inform macrophage-assisted pulmonary drug delivery strategies.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）