Design and performance analysis of a MopFan-based multi-stage air purification system for indoor pollution control – Green Technology & Innovation | Caravel Press
Indoor air pollution poses a significant threat to global health, contributing to respiratory and cardiovascular diseases and exacerbating environmental challenges. Addressing this critical issue, this study evaluates the performance of a novel air purification device, the MopFan – a system integrating advanced filtration technologies, including high-efficiency particulate air filters, photocatalytic oxidation, and bio-aerogel materials, principally designed to mitigate gaseous pollutants. The MopFan was tested under controlled environmental conditions across three room sizes and varying ventilation states to assess its efficacy in removing volatile organic compounds (VOCs) and formaldehyde (HCHO), common indoor air pollutants. Employing ethanol vapour as pollutant, the results demonstrated reductions in gaseous pollutant concentrations – specifically, VOCs and HCHO – of up to 65% in small, enclosed spaces, with performance influenced by room size and ventilation. The device’s multi-stage filtration system effectively decomposed pollutants, leveraging TiO₂-coated fibres activated by ultraviolet C light and bio-aerogel filters for enhanced antiviral and chemical filtration. Particularly, ventilation plays a critical role in pollutant dispersion. Further comparative analysis is recommended to ascertain whether such a reduction suffices to meet the current regulatory guidelines. This study highlights the MopFan’s potential as a sustainable, scalable solution for improving indoor air quality (IAQ) in diverse settings. The MopFan’s innovative design, combining eco-friendly materials and advanced filtration methods, offers a pathway to mitigate indoor air pollution’s health impacts, aligning with global sustainability and public health objectives. This research advances the scientific understanding of IAQ interventions and supports the development of effective, scalable solutions.
Keywords. Indoor air pollution; Air purification technologies; Photocatalytic oxidation; Bio-aerogel filtration; Sustainable air quality solutions
References
World Health Organization. Household Air Pollution and Health. World Health Organization; 2020. Available from: https:// www.who.int/news-room/fact-sheets/detail/household-air-pollution-and-health [Last accessed 2025Apr 17].
Smith KR, Frumkin H, Balakrishnan K, et al. Energy and human health. Annu Rev Public Health. 2013;34(1):159-188. doi: 10.1146/annurev-publhealth-031912-114404
Balakrishnan K, Cohen A, Smith KR. Addressing the burden of disease attributable to air pollution in India: The need to integrate across household and ambient air pollution exposures. Environ Health Perspect. 2014;122(1):A6-A7. doi: 10.1289/ehp.1307822
Awbi HB. Ventilation for good indoor air quality and energy efficiency. Energy Procedia. 2017;112:277-286. doi: 10.1016/j.egypro.2017.03.1098
Weschler CJ. Changes in indoor pollutants since the 1950s. Atmos Environ. 2009;43(1):153-169. doi: 10.1016/j.atmosenv.2008.09.044
Dales R, Liu L, Wheeler AJ, Gilbert NL. Quality of indoor residential air and health. CMAJ. 2008;179(2):147-152. doi: 10.1503/cmaj.070359
U.S. Environmental Protection Agency. FY 2023-2024 Office of Air and Radiation National Program Guidance. Publication 440-B-22-001. United States: US EPA; 2022. Available from: https://www.epa.gov/system/files/documents/2022-08/fy-2023-2024-oar-npg.pdf [Last accessed on 2025 Apr 17].
National Institute of Environmental Health Sciences. Air Pollution and Your Health. National Institute of Environmental Health Sciences; 2020. Available from: https://www.niehs.nih.gov [Last accessed on 2025 Apr 17].
Pope CA 3rd, Dockery DW. Health effects of fine particulate air pollution: Lines that connect. J Air Waste Manage Assoc. 2006;56(6):709-742. doi: 10.1080/10473289.2006.10464485
Zhang J, Smith KR. Indoor air pollution: A global health concern. Br Med Bull. 2003;68(1):209-225. doi: 10.1093/bmb/ldg029
Noorian Najafabadi SA, Sugano S, Bluyssen PM. Impact of carpets on indoor air quality. Appl Sci. 2022;12(24):12989. doi: 10.3390/app122412989
Saini J, Dutta M, Marques G. A comprehensive review on indoor air quality monitoring systems for enhanced public health. Sustain Environ Res. 2020;30:6. doi: 10.1186/s42834-020-0047-y
Kolarik J, Wargocki P. Can a photocatalytic air purifier be used to improve the perceived air quality indoors? Indoor Air. 2010;20(3):255-262. doi: 10.1111/j.1600-0668.2010.00650.x
Chen C, Zhao B, Weschler CJ. Indoor exposure to “outdoor PM10”: Assessing its influence on the relationship between PM₁₀ and short-term mortality in U.S. Cities. Epidemiology. 2012;23(6):870-878. doi: 10.1097/EDE.0b013e31826b800e
Klepeis NE, Nelson WC, Ott WR, et al. The national human activity pattern survey (NHAPS): A resource for assessing exposure to environmental pollutants. J Expo Sci Environ Epidemiol. 2001;11(3):231-252. doi: 10.1038/sj.jea.7500165
Prather KA, Marr LC, Schooley RT, McDiarmid MA, Wilson ME, Milton DK. Airborne transmission of SARS- CoV-2. Science. 2020;370(6514):303-304. doi: 10.1126/science.abf0521
Hashimoto K, Irie H, Fujishima A. TiO₂ photocatalysis: A historical overview and future prospects. Jpn J Appl Phys. 2005;44(12R):8269. doi: 10.1143/JJAP.44.8269
Zhong L, Haghighat F. Modeling of by-products from photocatalytic oxidation (PCO) indoor air purifiers: A case study of ethanol. Build Environ. 2018;144:427-436. doi: 10.1016/j.buildenv.2018.08.048
Ao CH, Lee SC. Indoor air purification by photocatalyst TiO₂ immobilised on an activated carbon filter installed in an air cleaner. Chem Eng Sci. 2005;60(1):103-109. doi: 10.1016/j.ces.2004.01.073
Weschler CJ. Ozone’s impact on public health: Contributions from indoor exposures to ozone and products of ozone-initiated chemistry. Environ Health Perspect. 2006;114(10):1489-1496. doi: 10.1289/ehp.9256
Woodord C. How do Photocatalytic Air Purifiers Work? Explain That Stuff; 2022. Available from: https://www.explainthatstuff.com/how-photocatalytic-air-purifiers-work.html [Last accessed on 2025 Apr 17].
Zhong L. Experimental Evaluation and Modeling of Photocatalytic Oxidation Air Cleaners [Doctoral dissertation]. Montreal, QC: Concordia University; 2013.
Tapia-Brito E, Riffat J, Wang Y, Ghaemmaghami AM, Coleman CM, Riffat S. Experimental investigation of a MopFan-based photocatalytic air purification device. Future Cities Environ. 2022;8(1):1-14. doi: 10.5334/fce.149
Wongaree M, Chiarakorn S, Chuangchote S, Sagawa T. Photocatalytic performance of electrospun CNT/TiO₂ nanofibres in a simulated air purifier under visible light irradiation. Environ Sci Pollut Res Int. 2016;23(21):21395-21406. doi: 10.1007/s11356-016-7348-z
Airpura Industries. Photocatalytic Oxidation in Air Purification. Airpura Industries; 2023. Available from: https://www.airpura.com [Last accessed 2025 Apr 16].
Tapia-Brito E, Riffat J, Wang Y, et al. Experimental study of the purification performance of a MopFan-based photocatalytic air cleaning system. Build Environ. 2023;240:110422. doi: 10.1016/j.buildenv.2023.110422
Wang Y, Tapia-Brito E, Riffat J, Chen Z, Jiang F, Riffat S. Investigation on the efficient removal of particulate matter (PM) with biomass-based aerogel. Future Cities Environ. 2021;7(1):1-12. doi: 10.5334/fce.131
Jia L, Xu YF, Shi YZ. Investigation of the ozone formation potential for ethanol using a smog chamber. Chin Sci Bull. 2012;57(18):4472-4481. doi: 10.1007/s11434-012-5375-9
Atkinson R, Arey J. Atmospheric degradation of volatile organic compounds. Chem Rev. 2003;103(12):4605-4638. doi: 10.1021/cr0206420
British Standards Institution. BS EN 1822-1:2019. High efficiency air filters (EPA, HEPA and ULPA) - Part 1: Classification, Performance Testing, Marking. Available from: https://www.en-standard.eu/bs-en-1822-1-2019-high-efficiency-air-filters-epa-hepa-and-ulpa-classification-performance-testing-marking [Last accessed on 2025 Apr 17].
Leung WWF, Sun Q. The efficacy of vacuum-ultraviolet light disinfection of some common pathogenic bacteria. BMC Infect Dis. 2020;20(1):127. doi: 10.1186/s12879-020-4847-9
Coleman CM, Wang B, Wang Y, et al. Antiviral activity of salt-coated materials against SARS-CoV-2. Access Microbiol. 2023;5(9):000492-v5. doi: 10.1099/acmi.0.000492.v5
How to cite this article
Tapia-Brito, E. and Riffat, S. (2025). 'Design and performance analysis of a MopFan-based multi-stage air purification system for indoor pollution control'. Green Technology & Innovation, 1, pp. 1-19. https://doi.org/10.36922/gti.7100
