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Hierarchical electrospun nanofibers treated by solvent vapor annealing as air filtration mat for high-efficiency PM2.5 capture

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  • ReceivedMay 28, 2018
  • AcceptedJul 2, 2018
  • PublishedAug 8, 2018

Abstract


Funded by

the National Natural Science Foundation of China(21473153,51771162)

Support Program for the Top Young Talents of Hebei Province

China Postdoctoral Science Foundation(2015M580214)

Research Program of the College Science & Technology of Hebei Province(ZD2018091)

and the Scientific and Technological Research and Development Program of Qinhuangdao City(201701B004)


Acknowledgment

This work was supported by the National Natural Science Foundation of China (21473153 and 51771162), Support Program for the Top Young Talents of Hebei Province, China Postdoctoral Science Foundation (2015M580214), Research Program of the College Science & Technology of Hebei Province (ZD2018091), and the Scientific and Technological Research and Development Program of Qinhuangdao City (201701B004).


Interest statement

The authors declare no conflicts of interest.


Contributions statement

Huang X, Jiao T, and Peng Q performed and designed the project and experiments. Liu Q, Zhang L, Zhou J, Li B, and Peng Q characterized the materials and discussed the results of the experiments. All the authors commented on the final paper.


Author information

Xinxin Huang is a postgraduate student in Professor Jiao’s group and will receive her master’s degree from the School of Environmental and Chemical Engineering at Yanshan University in 2019. Her current research focus is electrospun nanofiber composite materials for PM2.5 capture applications.


Tifeng Jiao received his PhD degree in physical chemistry from the Institute of Chemistry, Chinese Academy of Sciences (CAS). He was a Postdoctoral Fellow at CNRS (Centre National de la Recherche Scientifique) with Prof. Girard-Egrot (Université Claude Bernard Lyon 1, Lyon, France). Currently, he is a Full Professor and Vice Director of the School of Environmental and Chemical Engineering, Yanshan University. His current research focus includes the synthesis of new self-assembled nanostructured materials and nanocomposites and their related properties.


Qiuming Peng received his BSc degree at Xiangtan University of Technology and his PhD degree in inorganic chemistry from Changchun Institute of Applied Chemistry, CAS. He was an Alexander von Humboldt Fellow with Prof. Karl Ulrich Kainer (GKSS, Germany). In 2011, he was appointed as a Professor at Yanshan University. His current research focus includes high-pressure metallic-based materials and their related mechanical and chemical properties.


References

[1] Zhang R, Jing J, Tao J, et al. Chemical characterization and source apportionment of PM2.5 in Beijing: seasonal perspective. Atmos Chem Phys, 2013, 13: 7053-7074 CrossRef ADS Google Scholar

[2] Li K, Jiao T, Xing R, et al. Fabrication of tunable hierarchical MXene@AuNPs nanocomposites constructed by self-reduction reactions with enhanced catalytic performances. Sci China Mater, 2018, 61: 728-736 CrossRef Google Scholar

[3] Cheng C. Interfacial behaviors of PMMA-PEO block copolymers at the air/water interface. Sci China Ser B, 2005, 48: 567-573 CrossRef Google Scholar

[4] Zhao H, Jiao T, Zhang L, et al. Preparation and adsorption capacity evaluation of graphene oxide-chitosan composite hydrogels. Sci China Mater, 2015, 58: 811-818 CrossRef Google Scholar

[5] Sun Z, Liao T, Kou L. Strategies for designing metal oxide nanostructures. Sci China Mater, 2017, 60: 1-24 CrossRef Google Scholar

[6] Liang Q, Li Z, Bai Y, et al. Reduced-sized monolayer carbon nitride nanosheets for highly improved photoresponse for cell imaging and photocatalysis. Sci China Mater, 2017, 60: 109-118 CrossRef Google Scholar

[7] Wang D, Wang R, Liu L, et al. Down-shifting luminescence of water soluble NaYF4:Eu3+@Ag core-shell nanocrystals for fluorescence turn-on detection of glucose. Sci China Mater, 2017, 60: 68-74 CrossRef Google Scholar

[8] Streets DG, Wu Y, Chin M. Two-decadal aerosol trends as a likely explanation of the global dimming/brightening transition. Geophys Res Lett, 2006, 33: 292-306 CrossRef ADS Google Scholar

[9] Harrison RM, Yin J. Particulate matter in the atmosphere: which particle properties are important for its effects on health?. Sci Total Environ, 2000, 249: 85-101 CrossRef ADS Google Scholar

[10] Chow JC, Watson JG, Mauderly JL, et al. Health effects of fine particulate air pollution: lines that connect. J Air Waste Manage Association, 2006, 56: 1368-1380 CrossRef Google Scholar

[11] Betha R, Behera SN, Balasubramanian R. 2013 Southeast Asian smoke haze: Fractionation of particulate-bound elements and associated health risk. Environ Sci Technol, 2014, 48: 4327-4335 CrossRef PubMed ADS Google Scholar

[12] Wu S, Deng F, Wei H, et al. Association of cardiopulmonary health effects with source-appointed ambient fine particulate in Beijing, China: A combined analysis from the healthy volunteer natural relocation (HVNR) study. Environ Sci Technol, 2014, 48: 3438-3448 CrossRef PubMed ADS Google Scholar

[13] Brook RD, Rajagopalan S, Pope CA, et al. Particulate matter air pollution and cardiovascular disease: an update to the scientific statement from the American Heart Association. Circulation, 2010, 121: 2331-2378 CrossRef PubMed Google Scholar

[14] Anenberg SC, Horowitz LW, Tong DQ, et al. An estimate of the global burden of anthropogenic ozone and fine particulate matter on premature human mortality using atmospheric modeling. Environ Health Perspect, 2010, 118: 1189-1195 CrossRef PubMed Google Scholar

[15] Timonen KL, Vanninen E, de Hartog J, et al. Effects of ultrafine and fine particulate and gaseous air pollution on cardiac autonomic control in subjects with coronary artery disease: The ULTRA study. J Expo Sci Environ Epidemiol, 2006, 16: 332-341 CrossRef PubMed Google Scholar

[16] Reneker DH, Chun I. Nanometre diameter fibres of polymer, produced by electrospinning. Nanotechnology, 1996, 7: 216-223 CrossRef ADS Google Scholar

[17] Si Y, Wang X, Li Y, et al. Optimized colorimetric sensor strip for mercury(II) assay using hierarchical nanostructured conjugated polymers. J Mater Chem A, 2014, 2: 645-652 CrossRef Google Scholar

[18] Li D, Xia Y. Electrospinning of nanofibers: reinventing the wheel?. Adv Mater, 2004, 16: 1151-1170 CrossRef Google Scholar

[19] Lin J, Ding B, Yang J, et al. Subtle regulation of the micro- and nanostructures of electrospun polystyrene fibers and their application in oil absorption. Nanoscale, 2012, 4: 176-182 CrossRef PubMed ADS Google Scholar

[20] Matulevicius J, Kliucininkas L, Prasauskas T, et al. The comparative study of aerosol filtration by electrospun polyamide, polyvinyl acetate, polyacrylonitrile and cellulose acetate nanofiber media. J Aerosol Sci, 2016, 92: 27-37 CrossRef ADS Google Scholar

[21] Li J, Gao F, Liu LQ, et al. Needleless electro-spun nanofibers used for filtration of small particles. Express Polym Lett, 2013, 7: 683-689 CrossRef Google Scholar

[22] Kim HJ, Pant HR, Choi NJ, et al. Composite electrospun fly ash/polyurethane fibers for absorption of volatile organic compounds from air. Chem Eng J, 2013, 230: 244-250 CrossRef Google Scholar

[23] Scholten E, Bromberg L, Rutledge GC, et al. Electrospun polyurethane fibers for absorption of volatile organic compounds from air. ACS Appl Mater Interfaces, 2011, 3: 3902-3909 CrossRef PubMed Google Scholar

[24] Sambaer W, Zatloukal M, Kimmer D. 3D air filtration modeling for nanofiber based filters in the ultrafine particle size range. Chem Eng Sci, 2012, 82: 299-311 CrossRef Google Scholar

[25] Barhate RS, Loong CK, Ramakrishna S. Preparation and characterization of nanofibrous filtering media. J Membrane Sci, 2006, 283: 209-218 CrossRef Google Scholar

[26] Gibson P, Schreuder-Gibson H, Rivin D. Transport properties of porous membranes based on electrospun nanofibers. Colloids Surfs A-Physicochem Eng Aspects, 2001, 187-188: 469-481 CrossRef Google Scholar

[27] Liu C, Hsu PC, Lee HW, et al. Transparent air filter for high-efficiency PM2.5 capture. Nat Commun, 2015, 6: 6205 CrossRef PubMed ADS Google Scholar

[28] Wang Z, Zhao C, Pan Z. Porous bead-on-string poly(lactic acid) fibrous membranes for air filtration. J Colloid Interface Sci, 2015, 441: 121-129 CrossRef PubMed ADS Google Scholar

[29] Huang ZM, Zhang YZ, Kotaki M, et al. A review on polymer nanofibers by electrospinning and their applications in nanocomposites. Composites Sci Tech, 2003, 63: 2223-2253 CrossRef Google Scholar

[30] Ramakrishna S, Fujihara K, Teo WE, et al. Electrospun nanofibers: solving global issues. Mater Today, 2006, 9: 40-50 CrossRef Google Scholar

[31] Bhardwaj N, Kundu SC. Electrospinning: A fascinating fiber fabrication technique. Biotech Adv, 2010, 28: 325-347 CrossRef PubMed Google Scholar

[32] Kaur S, Sundarrajan S, Rana D, et al. Review: the characterization of electrospun nanofibrous liquid filtration membranes. J Mater Sci, 2014, 49: 6143-6159 CrossRef ADS Google Scholar

[33] Uyar T, Havelund R, Nur Y, et al. Molecular filters based on cyclodextrin functionalized electrospun fibers. J Membrane Sci, 2009, 332: 129-137 CrossRef Google Scholar

[34] Desai K, Kit K, Li J, et al. Nanofibrous chitosan non-wovens for filtration applications. Polymer, 2009, 50: 3661-3669 CrossRef Google Scholar

[35] Kadam VV, Wang L, Padhye R. Electrospun nanofibre materials to filter air pollutants–A review. J Industrial Textiles, 2018, 47: 2253-2280 CrossRef Google Scholar

[36] Wang N, Zhu Z, Sheng J, et al. Superamphiphobic nanofibrous membranes for effective filtration of fine particles. J Colloid Interface Sci, 2014, 428: 41-48 CrossRef PubMed ADS Google Scholar

[37] Wang N, Raza A, Si Y, et al. Tortuously structured polyvinyl chloride/polyurethane fibrous membranes for high-efficiency fine particulate filtration. J Colloid Interface Sci, 2013, 398: 240-246 CrossRef PubMed ADS Google Scholar

[38] Kayaci F, Uyar T. Electrospun polyester/cyclodextrin nanofibers for entrapment of volatile organic compounds. Polym Eng Sci, 2014, 54: 2970-2978 CrossRef Google Scholar

[39] Vanangamudi A, Hamzah S, Singh G. Synthesis of hybrid hydrophobic composite air filtration membranes for antibacterial activity and chemical detoxification with high particulate filtration efficiency (PFE). Chem Eng J, 2015, 260: 801-808 CrossRef Google Scholar

[40] Casper CL, Stephens JS, Tassi NG, et al. Controlling surface morphology of electrospun polystyrene fibers: effect of humidity and molecular weight in the electrospinning process. Macromolecules, 2004, 37: 573-578 CrossRef ADS Google Scholar

[41] Lee KH, Kim HY, Bang HJ, et al. The change of bead morphology formed on electrospun polystyrene fibers. Polymer, 2003, 44: 4029-4034 CrossRef Google Scholar

[42] Xu X, Wang H, Jiang L, et al. Comparison between cellulose nanocrystal and cellulose nanofibril reinforced poly(ethylene oxide) nanofibers and their novel shish-kebab-like crystalline structures. Macromolecules, 2014, 47: 3409-3416 CrossRef ADS Google Scholar

[43] Wang B, Li B, Xiong J, et al. Hierarchically ordered polymer nanofibers via electrospinning and controlled polymer crystallization. Macromolecules, 2008, 41: 9516-9521 CrossRef ADS Google Scholar

[44] Chen X, Wang W, Cheng S, et al. Mimicking bone nanostructure by combining block copolymer self-assembly and 1D crystal nucleation. ACS Nano, 2013, 7: 8251-8257 CrossRef PubMed Google Scholar

[45] Liu J, Bauer AJP, Li B. Solvent vapor annealing: an efficient approach for inscribing secondary nanostructures onto electrospun fibers. Macromol Rapid Commun, 2014, 35: 1503-1508 CrossRef PubMed Google Scholar

[46] Wang L, Pai CL, Boyce MC, et al. Wrinkled surface topographies of electrospun polymer fibers. Appl Phys Lett, 2009, 94: 151916 CrossRef ADS Google Scholar

[47] Bonino CA, Efimenko K, Jeong SI, et al. Three-dimensional electrospun alginate nanofiber mats via tailored charge repulsions. Small, 2012, 8: 1928-1936 CrossRef PubMed Google Scholar

[48] Lin J, Cai Y, Wang X, et al. Fabrication of biomimetic superhydrophobic surfaces inspired by lotus leaf and silver ragwort leaf. Nanoscale, 2011, 3: 1258-1262 CrossRef PubMed ADS Google Scholar

[49] Huang XF, Yun H, Gong ZH, et al. Source apportionment and secondary organic aerosol estimation of PM2.5 in an urban atmosphere in China. Sci China Earth Sci, 2014, 57: 1352-1362 CrossRef Google Scholar

[50] Lim CT, Tan EPS, Ng SY. Effects of crystalline morphology on the tensile properties of electrospun polymer nanofibers. Appl Phys Lett, 2008, 92: 141908 CrossRef ADS Google Scholar

[51] Yian Chew S, Hufnagel TC, Teck Lim C, et al. Mechanical properties of single electrospun drug-encapsulated nanofibres. Nanotechnology, 2006, 17: 3880-3891 CrossRef PubMed ADS Google Scholar

[52] Wong SC, Baji A, Leng S. Effect of fiber diameter on tensile properties of electrospun poly(ɛ-caprolactone). Polymer, 2008, 49: 4713-4722 CrossRef Google Scholar

[53] Pitt CG, Chasalow FI, Hibionada YM, et al. Aliphatic polyesters. I. The degradation of poly(ε-caprolactone) in vivo. J Appl Polym Sci, 1981, 26: 3779-3787 CrossRef Google Scholar

[54] Zhang Y, Mu Y, Meng F, et al. The pollution levels of BTEX and carbonyls under haze and non-haze days in Beijing, China. Sci Total Environ, 2014, 490: 391-396 CrossRef PubMed ADS Google Scholar

[55] Huang RJ, Zhang Y, Bozzetti C, et al. High secondary aerosol contribution to particulate pollution during haze events in China. Nature, 2014, 514: 218-222 CrossRef PubMed ADS Google Scholar

[56] Hou C, Jiao T, Xing R, et al. Preparation of TiO2 nanoparticles modified electrospun nanocomposite membranes toward efficient dye degradation for wastewater treatment. J Taiwan Institute Chem Engineers, 2017, 78: 118-126 CrossRef Google Scholar

[57] Bauer AJP, Grim ZB, Li B. Hierarchical polymer blend fibers of high structural regularity prepared by facile solvent vapor annealing treatment. Macromol Mater Eng, 2018, 303: 1700489 CrossRef Google Scholar

[58] Sepe A, Zhang J, Perlich J, et al. Toward an equilibrium structure in lamellar diblock copolymer thin films using solvent vapor annealing – An in-situ time-resolved GISAXS study. Eur Polymer J, 2016, 81: 607-620 CrossRef Google Scholar

[59] Sinturel C, Vayer M, Morris M, et al. Solvent vapor annealing of block polymer thin films. Macromolecules, 2013, 46: 5399-5415 CrossRef ADS Google Scholar

[60] Chen L, Zhao K, Chi S, et al. Improving fiber alignment by increasing the planar conformation of isoindigo-based conjugated polymers. Mater Chem Front, 2017, 1: 286-293 CrossRef Google Scholar

[61] Bauer AJP, Liu J, Windsor LJ, et al. Current development of collagen-based biomaterials for tissue repair and regeneration. Soft Mater, 2014, 12: 359-370 CrossRef Google Scholar

[62] Gan Z, Jiang B, Zhang J. Poly(ε-caprolactone)/poly(ethylene oxide) diblock copolymer. I. Isothermal crystallization and melting behavior. J Appl Polym Sci, 1996, 59: 961-967 CrossRef Google Scholar

[63] Zhou C, Chu R, Wu R, et al. Electrospun polyethylene oxide/cellulose nanocrystal composite nanofibrous mats with homogeneous and heterogeneous microstructures. Biomacromolecules, 2011, 12: 2617-2625 CrossRef PubMed Google Scholar

[64] Hu C, Cui W. Hierarchical structure of electrospun composite fibers for long-term controlled drug release carriers. Adv Healthcare Mater, 2015, 1: 809-814 CrossRef PubMed Google Scholar

[65] Lin J, Tian F, Shang Y, et al. Facile control of intra-fiber porosity and inter-fiber voids in electrospun fibers for selective adsorption. Nanoscale, 2012, 4: 5316-5320 CrossRef PubMed ADS Google Scholar

[66] Lai C, Guo Q, Wu XF, et al. Growth of carbon nanostructures on carbonized electrospun nanofibers with palladium nanoparticles. Nanotechnology, 2008, 19: 195303 CrossRef PubMed ADS Google Scholar

[67] Lu P, Xia Y. Maneuvering the internal porosity and surface morphology of electrospun polystyrene yarns by controlling the solvent and relative humidity. Langmuir, 2013, 29: 7070-7078 CrossRef PubMed Google Scholar

[68] Guo R, Jiao T, Li R, et al. Sandwiched Fe3O4/carboxylate graphene oxide nanostructures constructed by layer-by-layer assembly for highly efficient and magnetically recyclable dye removal. ACS Sustain Chem Eng, 2018, 6: 1279-1288 CrossRef Google Scholar

[69] Liu Y, Hou C, Jiao T, et al. Self-assembled AgNP-containing nanocomposites constructed by electrospinning as efficient dye photocatalyst materials for wastewater treatment. Nanomaterials, 2018, 8: 35 CrossRef PubMed Google Scholar

[70] Zhou J, Liu Y, Jiao T, et al. Preparation and enhanced structural integrity of electrospun poly(ε-caprolactone)-based fibers by freezing amorphous chains through thiol-ene click reaction. Colloids Surfs A-Physicochem Eng Aspects, 2018, 538: 7-13 CrossRef Google Scholar

[71] Song J, Xing R, Jiao T, et al. Crystalline dipeptide nanobelts based on solid–solid phase transformation self-assembly and their polarization imaging of cells. ACS Appl Mater Interfaces, 2018, 10: 2368-2376 CrossRef Google Scholar

[72] Huo S, Duan P, Jiao T, et al. Self-assembled luminescent quantum dots to generate full-color and white circularly polarized light. Angew Chem Int Ed, 2017, 56: 12174-12178 CrossRef PubMed Google Scholar

[73] Zhou J, Gao F, Jiao T, et al. Selective Cu(II) ion removal from wastewater via surface charged self-assembled polystyrene-Schiff base nanocomposites. Colloids Surfs A-Physicochem Eng Aspects, 2018, 545: 60-67 CrossRef Google Scholar

[74] Luo X, Ma K, Jiao T, et al. Graphene oxide-polymer composite langmuir films constructed by interfacial thiol-ene photopolymerization. Nanoscale Res Lett, 2017, 12: 99 CrossRef PubMed ADS Google Scholar

[75] Sun S, Jiao T, Xing R, et al. Preparation of MoS2-based polydopamine-modified core-shell nanocomposites with elevated adsorption performances. RSC Adv, 2018, 8: 21644-21650 CrossRef Google Scholar

[76] Li D, Wang Y, Xia Y. Electrospinning of polymeric and ceramic nanofibers as uniaxially aligned arrays. Nano Lett, 2003, 3: 1167-1171 CrossRef ADS Google Scholar

[77] Guibo Y, Qing Z, Yahong Z, et al. The electrospun polyamide 6 nanofiber membranes used as high efficiency filter materials: Filtration potential, thermal treatment, and their continuous production. J Appl Polym Sci, 2013, 128: 1061-1069 CrossRef Google Scholar

[78] Wu H, Kong D, Ruan Z, et al. A transparent electrode based on a metal nanotrough network. Nat Nanotech, 2013, 8: 421-425 CrossRef PubMed ADS Google Scholar

[79] Zhang S, Liu H, Zuo F, et al. A controlled design of ripple-like polyamide-6 nanofiber/nets membrane for high-efficiency air filter. Small, 2017, 13: 1603151 CrossRef PubMed Google Scholar

[80] Vitchuli N, Shi Q, Nowak J, et al. Electrospun ultrathin nylon fibers for protective applications. J Appl Polym Sci, 2010, 116: 2181-2187 CrossRef Google Scholar

[81] Wang N, Yang Y, Al-Deyab SS, et al. Ultra-light 3D nanofibre-nets binary structured nylon 6–polyacrylonitrile membranes for efficient filtration of fine particulate matter. J Mater Chem A, 2015, 3: 23946-23954 CrossRef Google Scholar

[82] Wang N, Si Y, Wang N, et al. Multilevel structured polyacrylonitrile/silica nanofibrous membranes for high-performance air filtration. Separation Purification Tech, 2014, 126: 44-51 CrossRef Google Scholar

  • Figure 1

    A schematic illustration of the preparation and filtration of the obtained electrospun nanowrinkled air filtration mat.

  • Figure 2

    (a) SEM images and fiber diameter size distributions of the prepared PCL/PEO nanofibers mat (Sample 1) by electrospinning (a and a') and subsequent by SVA treatment for 5 day (b and b').

  • Figure 3

    SEM images of the prepared electrospun PCL/PEO nanofibers (a, Sample 1) and SVA treatment at different time intervals: (b), one day; (c), 2 days; (d), 3 days; (e), 4 days; (f), 5 days.

  • Figure 4

    XRD patterns of the prepared PCL/PEO nanofibers (a) and with different subsequent SVA treatment time intervals (b).

  • Figure 5

    TG curves and infrared spectra of the PCL/PEO nanofiber mat by electrospinning and subsequent SVA treatment time of 5 days.

  • Figure 6

    Schematics of the air filtration mat that captured PM2.5 by air flow (a) and working state with mask filtration (b); (c) PM2.5 filtration curves for the air filtration mat (Sample 1) with different volumes of spinning precursor solution; (d) PM2.5 removal efficiency plots for primary fibers and SVA-treated fibers.

  • Figure 7

    SEM images and fiber diameter size distributions of the prepared PCL/PEO nanofiber mat by electrospinning (Sample 2, a and a'; Sample 3, c and c') and subsequently with SVA treatment at a time of 5 days (Sample 2, b and b'; Sample 3, d and d').

  • Figure 8

    (a) Comparison chart of PM2.5 removal efficiency of Sample 2 and Sample 3 with/without SVA treated fibers. (b) Comparison chart of PM2.5 removal efficiency of Sample 3 deposited on different commercial masks.

  • Figure 9

    (a) Photo of a commercial mask covered with an electrospun mat (Sample 1) after air filtration; (b, c) TEM and SEM characterization of the morphologies of Sample 1 attached to PM2.5 particles; (d) EDX composition analysis of PM2.5 particles.

  • Figure 10

    C 1s and O 1s deconvolutions in the XPS profiles of electrospun mat (Sample 1) before (a, b) and after (c, d) air filtration.

  • Table 1   Comparative characteristics and filtration performance of different materials reported in the literatures

    No.

    Materials

    Fiber diameter

    (nm)

    Filter media

    Advantages

    Disadvantage

    Ref.

    1

    Polyacrylonitrile

    (PAN)

    200

    Incense smoke

    Transparent, environmentally high stability and highly effective removal of PM2.5

    Low reusability, easy to aging, low strength, poor wear resistance

    [27]

    2

    Polylactic acid

    (PLA)

    150–300

    NaCl

    aerosol

    Controllable morphology, excellent filtration efficiency and a low pressure drop

    Poor stability, poor wear resistance and easy to aging

    [28]

    3

    Nylon6 (PA-6)

    150

    NaCl

    aerosol

    Good stability, good air permeability and good PM2.5 remove

    Easy to aging and low intensity

    [80]

    4

    Polyurethanes

    (PU)

    120

    Ammnium

    sulphate

    Excellent elasticity, good abrasion resistance and good PM2.5 remove

    Poor stability and easy to aging

    [24]

    5

    Nylon6/polyacrylonitrile

    (N6/PAN)

    272

    NaCl aerosol

    High porosity, high filtration efficiency and good stability.

    Poor air permeability, poor cycle performance

    [81]

    6

    Polyvinyl chloride /polyurethane

    (PVC/PU)

    960

    NaCl

    aerosol

    Good tensile strength, high abrasion resistance and high filtration efficiency

    Poor cycle performance and easy to aging

    [37]

    7

    Polyacrylonitrile /polyurethane (PAN/PU)

    175

    NaCl

    aerosol

    Superhydrophobicity, controllable morphology, porous structure

    Poor air permeability, poor cycle performance

    [36]

    8

    Polyacrylonitrile /silica nanoparticles (PAN/SiO2)

    600–700

    NaCl

    aerosol

    Layer-by-layer assisted stacking structure and high filtration efficiency

    Stability is poor, low strength, poor wear resistance

    [82]

    9

    Present work

    2,000–5,000

    smoke

    Adjustable nanostructure, high strength, high stability and high toughness

    Sensitive to temperature and solvents