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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Autores principales:	Roberta Orlando, Yilun Gao, Peter Fojan, Jinhan Mo, Alireza Afshari
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	cellulose acetate electrospinning particle pollution air filters titanium dioxide activated charcoal Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/28321a18aa6d4191b0ad30a82cc47afc
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spelling	oai:doaj.org-article:28321a18aa6d4191b0ad30a82cc47afc2021-11-25T17:00:36ZFiltration Performance of Ultrathin Electrospun Cellulose Acetate Filters Doped with TiO<sub>2</sub> and Activated Charcoal10.3390/buildings111105572075-5309https://doaj.org/article/28321a18aa6d4191b0ad30a82cc47afc2021-11-01T00:00:00Zhttps://www.mdpi.com/2075-5309/11/11/557https://doaj.org/toc/2075-5309Air 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.Roberta OrlandoYilun GaoPeter FojanJinhan MoAlireza AfshariMDPI AGarticlecellulose acetateelectrospinningparticle pollutionair filterstitanium dioxideactivated charcoalBuilding constructionTH1-9745ENBuildings, Vol 11, Iss 557, p 557 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	cellulose acetate electrospinning particle pollution air filters titanium dioxide activated charcoal Building construction TH1-9745
spellingShingle	cellulose acetate electrospinning particle pollution air filters titanium dioxide activated charcoal Building construction TH1-9745 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
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.
format	article
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
title	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_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_sort	filtration performance of ultrathin electrospun cellulose acetate filters doped with tio<sub>2</sub> and activated charcoal
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/28321a18aa6d4191b0ad30a82cc47afc
work_keys_str_mv	AT robertaorlando filtrationperformanceofultrathinelectrospuncelluloseacetatefiltersdopedwithtiosub2subandactivatedcharcoal AT yilungao filtrationperformanceofultrathinelectrospuncelluloseacetatefiltersdopedwithtiosub2subandactivatedcharcoal AT peterfojan filtrationperformanceofultrathinelectrospuncelluloseacetatefiltersdopedwithtiosub2subandactivatedcharcoal AT jinhanmo filtrationperformanceofultrathinelectrospuncelluloseacetatefiltersdopedwithtiosub2subandactivatedcharcoal AT alirezaafshari filtrationperformanceofultrathinelectrospuncelluloseacetatefiltersdopedwithtiosub2subandactivatedcharcoal
_version_	1718412765736992768

Filtration Performance of Ultrathin Electrospun Cellulose Acetate Filters Doped with TiO<sub>2</sub> and Activated Charcoal

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