Electrospun polyvinylidene fluoride/SiO2 nanofibrous membranes with enhanced electret property for efficient air filtration

2019 ◽  
Vol 13 ◽  
pp. 57-62 ◽  
Author(s):  
Xinxin Ding ◽  
Yuyao Li ◽  
Yang Si ◽  
Xia Yin ◽  
Jianyong Yu ◽  
...  
Keyword(s):  
Polyvinylidene Fluoride ◽  
Air Filtration ◽  
Electret Property ◽  
Nanofibrous Membranes

scholarly journals Electrospun Nanostructured Membrane Engineering Using Reverse Osmosis Recycled Modules: Membrane Distillation Application

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1601
Author(s):  
Jorge Contreras-Martínez ◽  
Carmen García-Payo ◽  
Mohamed Khayet
Keyword(s):  
Reverse Osmosis ◽  
Polyvinylidene Fluoride ◽  
Membrane Distillation ◽  
Permeate Flux ◽  
Electrospinning Technique ◽  
Salt Rejection ◽  
Rejection Factor ◽  
Nanofibrous Membranes ◽  
Membrane Engineering ◽  
Desalination Plants

As a consequence of the increase in reverse osmosis (RO) desalination plants, the number of discarded RO modules for 2020 was estimated to be 14.8 million annually. Currently, these discarded modules are disposed of in nearby landfills generating high volumes of waste. In order to extend their useful life, in this research study, we propose recycling and reusing the internal components of the discarded RO modules, membranes and spacers, in membrane engineering for membrane distillation (MD) technology. After passive cleaning with a sodium hypochlorite aqueous solution, these recycled components were reused as support for polyvinylidene fluoride nanofibrous membranes prepared by electrospinning technique. The prepared membranes were characterized by different techniques and, finally, tested in desalination of high saline solutions (brines) by direct contact membrane distillation (DCMD). The effect of the electrospinning time, which is the same as the thickness of the nanofibrous layer, was studied in order to optimize the permeate flux together with the salt rejection factor and to obtain robust membranes with stable DCMD desalination performance. When the recycled RO membrane or the permeate spacer were used as supports with 60 min electrospinning time, good permeate fluxes were achieved, 43.2 and 18.1 kg m−2 h−1, respectively; with very high salt rejection factors, greater than 99.99%. These results are reasonably competitive compared to other supported and unsupported MD nanofibrous membranes. In contrast, when using the feed spacer as support, inhomogeneous structures were observed on the electrospun nanofibrous layer due to the special characteristics of this spacer resulting in low salt rejection factors and mechanical properties of the electrospun nanofibrous membrane.

Multilayer electrospun nanofibrous membranes with antibacterial property for air filtration

2020 ◽  
Vol 515 ◽  
pp. 145962 ◽  
Author(s):  
Lu Zhang ◽  
Lingfeng Li ◽  
Lincai Wang ◽  
Jun Nie ◽  
Guiping Ma
Keyword(s):  
Antibacterial Property ◽  
Air Filtration ◽  
Nanofibrous Membranes

Graphene Oxide-Modified Polyacrylonitrile Nanofibrous Membranes for Efficient Air Filtration

2019 ◽  
Vol 2 (6) ◽  
pp. 3916-3924 ◽  
Author(s):  
Chaoran Zhang ◽  
Lu Yao ◽  
Zhi Yang ◽  
Eric Siu-Wai Kong ◽  
Xiaofeng Zhu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Air Filtration ◽  
Nanofibrous Membranes

Electrospun polyvinylidene fluoride containing nanoscale graphite platelets as electret membrane and its application in air filtration under extreme environment

Polymer ◽  
2017 ◽  
Vol 131 ◽  
pp. 143-150 ◽  
Author(s):  
Zhao-Xia Huang ◽  
Xiaoxiao Liu ◽  
Xu Zhang ◽  
Shing-Chung Wong ◽  
George G. Chase ◽  
...  
Keyword(s):  
Polyvinylidene Fluoride ◽  
Extreme Environment ◽  
Air Filtration

scholarly journals Preparation of electrospun nanofiber membrane for air filtration and process optimization based on BP neural network

2021 ◽  
Author(s):  
Le Kang ◽  
Yuankun Liu ◽  
Liping Wang ◽  
Xiaoping Gao
Keyword(s):  
Neural Network ◽  
Quality Factor ◽  
Flow Rate ◽  
Bp Neural Network ◽  
Polyvinylidene Fluoride ◽  
Orthogonal Experiment ◽  
Solution Concentration ◽  
Filtration Efficiency ◽  
Air Filtration ◽  
Filtration Resistance

Abstract The filtration layer in a medical protective mask can effectively prevent aerosol particles that might carry viruses from air. A nanofiber/microfiber composite membrane (NMCM) was successfully fabricated by electrospinning polyvinylidene fluoride (PVDF) nanofibers collected on the electrified and melt-blown polypropylene (PP) nonwovens, aiming to improve the filtration efficiency and reduce the resistance of respiration of mask. A four-factor and three-level orthogonal experiment was designed to study the effect of electrospinning parameters such as spinning solution concentration, voltage, tip-collect distance (TCD), and flow rate of solution on the filtration efficiency, resistance of respiration as well as quality factor of NMC developed to predict the resistance of respiration. Experimental results demonstrated that the filtration efficiency of NMCM≥95% in comparison to that of electrified and melt-blown PP nonwovens 79.38%, which increases by 19.68%. Additionally, the average resistance of respiration is 94.78 Pa, which meets the protection requirements. Multivariate analysis of variance indicated that the resistance of respiration of the NMCM has significantly dependent on the concentration, voltage, TCD, and flow rate of the spinning solution and the quality factor of the NMCM has dependent on the resistance of respiration. The air permeability ranges from 166.23 to 314.35mm/s, which is inversely proportional to the filtration resistance. As far as the filtration resistance is concerned, the optimal spinning parameters were obtained as follows. The concentration of spinning solution is 15%, the voltage is 27 kV, the TCD is 22 cm, and the flow rate is 2.5 mL/h. The relative error of the BP neural network varies from 0.49505% to 1.49217%, i.e. the error value varies from 0.17 to1.33 Pa. The predicted resistance of respiration corresponding to the optimal process is 68.1374 Pa.

Flexible Multifunctional Porous Nanofibrous Membranes for High-Efficiency Air Filtration

2019 ◽  
Vol 11 (46) ◽  
pp. 43409-43415 ◽  
Author(s):  
Baixian Wang ◽  
Qifei Wang ◽  
Yang Wang ◽  
Jiancheng Di ◽  
Shiding Miao ◽  
...  
Keyword(s):  
High Efficiency ◽  
Air Filtration ◽  
Nanofibrous Membranes

Branched nanofibers with tiny diameters for air filtration via one-step electrospinning

2020 ◽  
pp. 152808372092377
Author(s):  
Bilal Zaarour ◽  
Hussen Tina ◽  
Lei Zhu ◽  
XiangYu Jin
Keyword(s):  
Sodium Chloride ◽  
Pressure Drop ◽  
Polyvinylidene Fluoride ◽  
Filtration Efficiency ◽  
Air Filtration ◽  
Air Filter ◽  
One Step ◽  
Tetrabutylammonium Chloride ◽  
Filtration Properties ◽  
Branched Structure

Engineering the surface morphology of fibers has been attracting significant consideration in various areas and applications. In this study, polyvinylidene fluoride (PVDF) branched nanofibers with a diameter of less than 50 nm are electrospun directly at a low relative humidity by adding tetrabutylammonium chloride. The effects of the branched structure on the specific surface area and pore size distribution are investigated, and the filtration properties of the air filter based on branched nanofiber webs with different basis weights are studied. The results exhibit that the air filter based on PVDF branched nanofibers with the basis weight of 1 g/m2 has an outstanding filtration efficiency (99.999%) to 0.26 µm sodium chloride particles under the pressure drop of 126.17 Pa. We believe that this study can be used as a useful reference for the preparation of branched nanofibers through one-step electrospinning.

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