Filtration Performance of Ultrathin Electrospun Cellulose Acetate Filters Doped with TiO<sub>2</sub> and Activated Charcoal
Air filters are crucial components of a building ventilation system that contribute to improving indoor air quality, but they are typically associated with relatively high pressure drops. The purpose of the study is to evaluate the effect of additives on ultrathin electrospun filters, the pressure d...
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| Format: | Article |
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MDPI AG
2021-11-01
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| Series: | Buildings |
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| Online Access: | https://www.mdpi.com/2075-5309/11/11/557 |
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| author | Roberta Orlando Yilun Gao Peter Fojan Jinhan Mo Alireza Afshari |
| author_facet | Roberta Orlando Yilun Gao Peter Fojan Jinhan Mo Alireza Afshari |
| author_sort | Roberta Orlando |
| collection | DOAJ |
| description | Air filters are crucial components of a building ventilation system that contribute to improving indoor air quality, but they are typically associated with relatively high pressure drops. The purpose of the study is to evaluate the effect of additives on ultrathin electrospun filters, the pressure drop, and the particle removal efficiency of uniformly charged particles. The fibres were electrospun under optimised conditions that resulted in a fast-fabricating process due to the properties of the cellulose acetate solution. Different ultrathin electrospun fibre filters based on cellulose acetate (CA) were fabricated: a pure CA electrospun fibre filter, two filters based on CA fibres separately doped with activated charcoal (AC) and titanium dioxide (TiO<sub>2</sub>), respectively, and a composite filter where the two additives, AC and TiO<sub>2</sub>, were embedded between two CA fibres layers. The ultrathin filters exhibited a low pressure drop of between 63.0 and 63.8 Pa at a face velocity of 0.8 m s<sup>−1</sup>. The filtration performance of uniformly charged particles showed a removal efficiency above 70% for particle sizes between 0.3 and 0.5 μm for all filters, rising above 90% for larger particles between 1 and 10 μm, which translates to the average sizes of pollens and other allergenic contaminant particles. Due to the positive impact on the fibre morphology caused by the additives, the composite filter showed the highest filtration performance among the produced filters, reaching 82.3% removal efficiency towards smaller particles and a removal of up to 100% for particle sizes between 5 and 10 μm. Furthermore, cellulose acetate itself is not a source of microparticles and is fully biodegradable compared to other polymers commonly used for filters. These ultrathin electrospun filters are expected to be practical in applications for better building environments. |
| first_indexed | 2024-03-10T05:39:05Z |
| format | Article |
| id | doaj.art-28321a18aa6d4191b0ad30a82cc47afc |
| institution | Directory Open Access Journal |
| issn | 2075-5309 |
| language | English |
| last_indexed | 2024-03-10T05:39:05Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Buildings |
| spelling | doaj.art-28321a18aa6d4191b0ad30a82cc47afc2023-11-22T22:40:15ZengMDPI AGBuildings2075-53092021-11-01111155710.3390/buildings11110557Filtration Performance of Ultrathin Electrospun Cellulose Acetate Filters Doped with TiO<sub>2</sub> and Activated CharcoalRoberta Orlando0Yilun Gao1Peter Fojan2Jinhan Mo3Alireza Afshari4Department of the Built Environment, Aalborg University, DK-2450 Copenhagen, DenmarkDepartment of Building Science, Tsinghua University, Beijing 100084, ChinaDepartment of Materials and Production, Aalborg University, DK-9220 Aalborg, DenmarkDepartment of Building Science, Tsinghua University, Beijing 100084, ChinaDepartment of the Built Environment, Aalborg University, DK-2450 Copenhagen, DenmarkAir filters are crucial components of a building ventilation system that contribute to improving indoor air quality, but they are typically associated with relatively high pressure drops. The purpose of the study is to evaluate the effect of additives on ultrathin electrospun filters, the pressure drop, and the particle removal efficiency of uniformly charged particles. The fibres were electrospun under optimised conditions that resulted in a fast-fabricating process due to the properties of the cellulose acetate solution. Different ultrathin electrospun fibre filters based on cellulose acetate (CA) were fabricated: a pure CA electrospun fibre filter, two filters based on CA fibres separately doped with activated charcoal (AC) and titanium dioxide (TiO<sub>2</sub>), respectively, and a composite filter where the two additives, AC and TiO<sub>2</sub>, were embedded between two CA fibres layers. The ultrathin filters exhibited a low pressure drop of between 63.0 and 63.8 Pa at a face velocity of 0.8 m s<sup>−1</sup>. The filtration performance of uniformly charged particles showed a removal efficiency above 70% for particle sizes between 0.3 and 0.5 μm for all filters, rising above 90% for larger particles between 1 and 10 μm, which translates to the average sizes of pollens and other allergenic contaminant particles. Due to the positive impact on the fibre morphology caused by the additives, the composite filter showed the highest filtration performance among the produced filters, reaching 82.3% removal efficiency towards smaller particles and a removal of up to 100% for particle sizes between 5 and 10 μm. Furthermore, cellulose acetate itself is not a source of microparticles and is fully biodegradable compared to other polymers commonly used for filters. These ultrathin electrospun filters are expected to be practical in applications for better building environments.https://www.mdpi.com/2075-5309/11/11/557cellulose acetateelectrospinningparticle pollutionair filterstitanium dioxideactivated charcoal |
| spellingShingle | Roberta Orlando Yilun Gao Peter Fojan Jinhan Mo Alireza Afshari Filtration Performance of Ultrathin Electrospun Cellulose Acetate Filters Doped with TiO<sub>2</sub> and Activated Charcoal Buildings cellulose acetate electrospinning particle pollution air filters titanium dioxide activated charcoal |
| title | Filtration Performance of Ultrathin Electrospun Cellulose Acetate Filters Doped with TiO<sub>2</sub> and Activated Charcoal |
| title_full | Filtration Performance of Ultrathin Electrospun Cellulose Acetate Filters Doped with TiO<sub>2</sub> and Activated Charcoal |
| title_fullStr | Filtration Performance of Ultrathin Electrospun Cellulose Acetate Filters Doped with TiO<sub>2</sub> and Activated Charcoal |
| title_full_unstemmed | Filtration Performance of Ultrathin Electrospun Cellulose Acetate Filters Doped with TiO<sub>2</sub> and Activated Charcoal |
| title_short | Filtration Performance of Ultrathin Electrospun Cellulose Acetate Filters Doped with TiO<sub>2</sub> and Activated Charcoal |
| title_sort | filtration performance of ultrathin electrospun cellulose acetate filters doped with tio sub 2 sub and activated charcoal |
| topic | cellulose acetate electrospinning particle pollution air filters titanium dioxide activated charcoal |
| url | https://www.mdpi.com/2075-5309/11/11/557 |
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