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Shim E, Noh J, Kim Y. Development and Performance Evaluation of Polytetrafluoroethylene-Membrane-Based Automotive Cabin Air Filter. ACS OMEGA 2022; 7:43738-43746. [PMID: 36506122 PMCID: PMC9730776 DOI: 10.1021/acsomega.2c04758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 10/25/2022] [Indexed: 06/17/2023]
Abstract
A high-efficiency, long-life cabin filter unit is required for the effective purification of the air inside a vehicle. However, conventional cabin air filters that utilize electrostatic effects are less efficient and less effective owing to environmental factors. Polytetrafluoroethylene (PTFE) membranes exhibit a high porosity and surface-to-surface dust-removal performance, and maintain a stable pressure drop, indicating their good potential as filter materials. Therefore, in this study, the use of PTFE membranes for the fabrication of automobile filters and the filtration performance of the filters were examined. To this end, first, the properties of PTFE membranes mainly used in HEPA air conditioning filters and those of membranes used as vehicle cabin filters were compared. Next, the thickness, weight, stiffness, pore size, and filtration performance characteristics of filter media fabricated by blending melt-blown (MB) nonwoven, PTFE membranes, and supporting nonwoven into a total filtration layer were compared and analyzed. Lastly, the environmental change durability performance of the automobile cabin filter based on PTFE membrane and the results of the test after the installation of the filter in a vehicle were demonstrated.
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Effects of various humid environments on the filtration and dust cleaning performance of filter media. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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3
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Shao Z, Chen H, Wang Q, Kang G, Wang X, Li W, Liu Y, Zheng G. High-performance multifunctional electrospun fibrous air filter for personal protection: A review. Sep Purif Technol 2022; 302:122175. [PMID: 36168392 PMCID: PMC9492398 DOI: 10.1016/j.seppur.2022.122175] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 09/13/2022] [Accepted: 09/16/2022] [Indexed: 11/05/2022]
Abstract
With the increasingly serious air pollution and the rampant coronavirus disease 2019 (COVID–19), preparing high–performance air filter to achieve the effective personal protection has become a research hotspot. Electrospun nanofibrous membrane has become the first choice of air filter because of its small diameter, high specific surface area and porosity. However, improving the filtration performance of the filter only cannot meet the personal needs: it should be given more functions based on high filtration performance to maximize the personal benefits, called, multifunctional, which can also be easily realized by electrospinning technology, and has attracted much attention. In this review, the filtration mechanism of high–performance electrospun air filter is innovatively summarized from the perspective of membrane. On this basis, the specific preparation process, advantages and disadvantages are analyzed in detail. Furthermore, other functions required for achieving maximum personal protection benefits are introduced specifically, and the existing high–performance electrospun air filter with multiple functions are summarized. Finally, the challenges, limitations, and development trends of manufacturing high–performance air filter with multiple functions for personal protection are presented.
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Affiliation(s)
- Zungui Shao
- Department of Instrumental and Electrical Engineering, Xiamen University, Xiamen 361102, China
| | - Huatan Chen
- Department of Instrumental and Electrical Engineering, Xiamen University, Xiamen 361102, China
| | - Qingfeng Wang
- Department of Instrumental and Electrical Engineering, Xiamen University, Xiamen 361102, China
| | - Guoyi Kang
- Department of Instrumental and Electrical Engineering, Xiamen University, Xiamen 361102, China
| | - Xiang Wang
- School of Mechanical and Automotive Engineering, Xiamen University of Technology, Xiamen 361024, China
| | - Wenwang Li
- School of Mechanical and Automotive Engineering, Xiamen University of Technology, Xiamen 361024, China
| | - Yifang Liu
- Department of Instrumental and Electrical Engineering, Xiamen University, Xiamen 361102, China
| | - Gaofeng Zheng
- Department of Instrumental and Electrical Engineering, Xiamen University, Xiamen 361102, China
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Su Q, Wei Z, Zhu C, Wang X, Zeng W, Wang S, Long S, Yang J. Multilevel structured PASS nanofiber filter with outstanding thermal stability and excellent mechanical property for high-efficiency particulate matter removal. JOURNAL OF HAZARDOUS MATERIALS 2022; 431:128514. [PMID: 35217345 DOI: 10.1016/j.jhazmat.2022.128514] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 02/12/2022] [Accepted: 02/17/2022] [Indexed: 05/25/2023]
Abstract
Particulate matter (PM) pollution from industrialization poses a great threat to people's health. Although fiber-based filters are used effectively to capture PM, the traditional filters with large diameter suffer from low filtration efficiency, high pressure drop and low temperature resistance. In this study, multilayer poly arylene sulfide sulfone (M-PASS) composite filter was designed and fabricated via electrospinning technology. The M-PASS composite filter is sandwich-structure. Due to the unique structure and composition, the M-PASS filter exhibited outstanding removal efficiency of 99.97 ± 0.0050%, extremely low air resistance of 44.3 ± 0.7 Pa, excellent quality factor (QF) of 0.19 ± 0.0019 Pa-1, and desirable mechanical strength of 7.0 ± 0.2 MPa. Furthermore, the as-prepared M-PASS filter can remain outstanding filtration performance at 200.0 ℃ due to the high thermal stability of PASS and the removal efficiency was still above 95.2 ± 0.4% after long-term filtration test. These results demonstrate that the structure of filter is the important one for air filtration and the M-PASS nanofiber filters have great potential in PM removal, especially under high temperature conditions.
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Affiliation(s)
- Qing Su
- Institute of Materials Science and Technology, Analytical & Testing Center, Sichuan University, Chengdu 610065, China; College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Zhimei Wei
- Institute of Materials Science and Technology, Analytical & Testing Center, Sichuan University, Chengdu 610065, China; State Key Laboratory of Polymer Materials Engineering (Sichuan University), Chengdu 610065, China.
| | - Chuanren Zhu
- College of Polymer Science and Engineering, Sichuan University, Chengdu 610064, China
| | - Xiaojun Wang
- Institute of Materials Science and Technology, Analytical & Testing Center, Sichuan University, Chengdu 610065, China
| | - Wei Zeng
- College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Shaoyu Wang
- College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Shengru Long
- Institute of Materials Science and Technology, Analytical & Testing Center, Sichuan University, Chengdu 610065, China
| | - Jie Yang
- Institute of Materials Science and Technology, Analytical & Testing Center, Sichuan University, Chengdu 610065, China; State Key Laboratory of Polymer Materials Engineering (Sichuan University), Chengdu 610065, China
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5
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Schwarz AD, Dutzi J, Weber P, Sattler C, Schulz K, Caesar T, Meyer J, Dittler A. Humidity Considerations in Filter Testing Based on Analysis of Filters from Gas Turbine Applications. Chem Eng Technol 2022. [DOI: 10.1002/ceat.202100344] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Almuth D. Schwarz
- Karlsruhe Institute of Technology Institute of Mechanical Process Engineering and Mechanics Strasse am Forum 8 76131 Karlsruhe Germany
| | - Julian Dutzi
- Karlsruhe Institute of Technology Institute of Mechanical Process Engineering and Mechanics Strasse am Forum 8 76131 Karlsruhe Germany
| | - Patrick Weber
- Freudenberg Filtration Technologies SE & Co. KG Hoehnerweg 2–4 69469 Weinheim Germany
| | - Carsten Sattler
- Freudenberg Filtration Technologies SE & Co. KG Hoehnerweg 2–4 69469 Weinheim Germany
| | - Karsten Schulz
- Freudenberg Filtration Technologies SE & Co. KG Hoehnerweg 2–4 69469 Weinheim Germany
| | - Thomas Caesar
- Freudenberg Filtration Technologies SE & Co. KG Hoehnerweg 2–4 69469 Weinheim Germany
| | - Jörg Meyer
- Karlsruhe Institute of Technology Institute of Mechanical Process Engineering and Mechanics Strasse am Forum 8 76131 Karlsruhe Germany
| | - Achim Dittler
- Karlsruhe Institute of Technology Institute of Mechanical Process Engineering and Mechanics Strasse am Forum 8 76131 Karlsruhe Germany
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Heo KJ, Oh HJ, Eom H, Kim Y, Jung JH. High-performance bag filter with a super-hydrophobic microporous polytetrafluoroethylene layer fabricated by air-assisted electrospraying. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 783:147043. [PMID: 34088110 DOI: 10.1016/j.scitotenv.2021.147043] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 03/19/2021] [Accepted: 04/06/2021] [Indexed: 06/12/2023]
Abstract
Reducing PM emissions from industrial sites has become increasingly important as the adverse health effects of particulate matter have been demonstrated by multiple epidemiological and toxicological studies. High-performance bag filters are often used for this purpose. We fabricated polytetrafluoroethylene (PTFE) nanoparticle (NP)-coated high-efficiency bag filters using air-assisted electrospraying (AAES) technology. AAES functionalized with a combination of airflow drag force and an applied electric field facilitates high-throughput without requiring additional purification or preparation process of a PTFE emulsion. PTFE NPs form a unique three-dimensional microporous structure on a foam-filter medium, enhancing mechanical filtration performance (diffusion and interception). Moreover, the surface hydrophobicity was significantly improved as the PTFE NPs covered the bag filter surface. These factors highlight the feasibility of large-scale implementation of PTFE NP-coated bag filters for reducing PM emissions from industrial sources.
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Affiliation(s)
- Ki Joon Heo
- Advanced Textile R&D Department, Korea Institute of Industrial Technology (KITECH), Ansan 15588, Republic of Korea; Department of Environmental Machinery, Korea Institute of Machinery & Materials (KIMM), Daejeon 34103, Republic of Korea
| | - Hyun Ju Oh
- Advanced Textile R&D Department, Korea Institute of Industrial Technology (KITECH), Ansan 15588, Republic of Korea
| | - Hyeonjin Eom
- Thermochemical energy system R&D group, Korea Institute of Industrial Technology (KITECH), Chenan 31056, Republic of Korea
| | - Yeonsang Kim
- Advanced Textile R&D Department, Korea Institute of Industrial Technology (KITECH), Ansan 15588, Republic of Korea.
| | - Jae Hee Jung
- Department of Mechanical Engineering, Sejong University, Seoul 05006, Republic of Korea.
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Liu T, Cai C, Ma R, Deng Y, Tu L, Fan Y, Lu D. Super-hydrophobic Cellulose Nanofiber Air Filter with Highly Efficient Filtration and Humidity Resistance. ACS APPLIED MATERIALS & INTERFACES 2021; 13:24032-24041. [PMID: 33978395 DOI: 10.1021/acsami.1c04258] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
High-air humidity, especially condensation into droplets under the influence of temperature, can pose a serious threat to air purification filters. This report introduces the use of methyltrimethoxysilane (MTMS) for the silanization hydrophobic modification of cellulose nanofibers (CNFs) and obtains an air filter with super-hydrophobicity (CA = 152.4°) and high-efficiency filtration of particulate matter (PM) through the freeze-drying technology. The antihumidity performance of CNFs filters that undergo hydrophobic modification in high-humidity air is improved. Especially in the case of high-humidity air forming condensed water droplets, the increase in the rate of filtration resistance of the hydrophobically modified CNFs filter is much lower than that of the unmodified filter. In addition, the water-vapor-transmission rate of the hydrophobically modified filter is improved. More importantly, adding MTMS can regulate the porous structure of CNFs filters and improve the filtration performance. The specific surface area and the porosity of the filter are 26.54 m2/g and 99.21%, respectively, and the filtering effects of PM1.0 and PM2.5 reach 99.31 and 99.75%, respectively, while a low-filtration resistance (42 Pa) and a quality factor of up to 0.122 Pa-1 are achieved. This work has improved the application potential of high-performance air-purification devices to remove particulate pollution and may provide useful insights to design next-generation air filters suitable for application in high-air humidity.
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Affiliation(s)
- Tao Liu
- School of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China
| | - Chenchen Cai
- School of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China
| | - Ruijia Ma
- School of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China
| | - Yongfei Deng
- School of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China
| | - Lingyun Tu
- School of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China
| | - Yifeng Fan
- School of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China
| | - Dengjun Lu
- School of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China
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Scatigno C, Prieto-Taboada N, Festa G, Madariaga JM. Soluble Salts Quantitative Characterization and Thermodynamic Modeling on Roman Bricks to Assess the Origin of Their Formation. Molecules 2021; 26:2866. [PMID: 34066114 PMCID: PMC8150792 DOI: 10.3390/molecules26102866] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 05/04/2021] [Accepted: 05/08/2021] [Indexed: 12/02/2022] Open
Abstract
The environmental weathering and the formation of efflorescences on the brick walls are studied at the "Casa di Diana" Mithraeum at Ostia Antica archaeological site. Previous studies on subsoil, bedrock, hydrological systems and environmental conditions, and new ion chromatography analysis combined with ECOS-RUNSALT and Medusa-Hydra thermodynamic modelling software, had allowed us to identify the subsoil contamination related to soluble salts. The atmospheric acidic gases, CO2 and SO2, are determined as the main salt weathering species. A dry deposition after a subsequent hydration action from the shallow freshwater aquifer that reaches up to 1 m on the walls is identified as the mechanism of salt formation. An evaluation of potential sources such as the nearby Fiumicino airport, CO2-rich gases inputs from fumaroles and CO2 inputs was also debated. The risk level of contamination the surfaces of the materials should be considered mildly/very polluted with a medium/high risk of hygroscopic moisture due to the high concentration of sulphates.
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Affiliation(s)
- Claudia Scatigno
- CREF-Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”, Via Panisperna 89 a, c/o Piazza del Viminale 1, 00189 Rome, Italy;
| | - Nagore Prieto-Taboada
- Department of Applied Chemistry, Faculty of Chemistry, UPV-EHU, P° Manuel Lardizabal, 3, 20018 Donostia, Spain;
| | - Giulia Festa
- CREF-Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”, Via Panisperna 89 a, c/o Piazza del Viminale 1, 00189 Rome, Italy;
| | - Juan Manuel Madariaga
- Department of Analytical Chemistry, Faculty of Science and Technology, UPV-EHU, 48080 Bilbao, Spain;
- Unesco Chair of Cultural Landscapes and Heritage, UPV-EHU, 01006 Vitoria-Gasteiz, Spain
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