Fabrication of Water-Based -Coated Pleated Synthetic Fiber toward Photocatalytic Oxidation of VOCs and CO for Indoor Air Quality Improvement
Publication: Journal of Environmental Engineering
Volume 145, Issue 6
Abstract
While titanium dioxide () is highly regarded as one of the most promising catalysts for air-pollution mitigation, its practical use has been challenging due to structural complexity, process scalability, and high cost of existing fabrication methods. In this study, a facile spray-coating method is employed for fabrication of a -coated filter, with fibrous structure allowing for satisfactory airflow, sufficient pollutant–catalyst interactions, and reusability. Scanning electron microscopy (SEM) analysis shows that nanoparticles were immobilized firmly on the surface of the membrane’s fibers. Energy dispersive X-ray (EDX) analysis reveals a homogeneous layer of nanoparticles on the pleated washable synthetic (PWS) fibers. The photocatalytic oxidations of volatile organic compounds (VOCs) and carbon monoxide (CO) are analyzed in both the laboratory and field tests. -coated PWS filter membrane () shows higher benzene and toluene removal efficiency (approximately 80%–86%) under UV radiation than that in the dark (less than 10%). This result indicates that photocatalytic oxidation on the surface of -coated PWS filter membrane contributes greatly to benzene and toluene degradation. The corresponding pilot-scale photocatalytic air filtration unit shows ethylene reduction rate of in a postharvest storage room. In a demonstrative elimination of automotive exhaust gases, the coated PWS filter membrane shows a 16% decrease in CO generated from a motorcycle. This study shows the potential use of the cost-effective -coated filter membrane for indoor air quality improvement.
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Acknowledgments
This study was partially supported by the National Research Council of Thailand. Furthermore, we are thankful to the automotive emission laboratory, Department of Pollution Control, Ministry of Natural Resources and Environment, and Department of Agriculture, Ministry of Agriculture and Cooperatives, Thailand, for their support on field trials.
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©2019 American Society of Civil Engineers.
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Received: Mar 10, 2018
Accepted: Oct 24, 2018
Published online: Apr 8, 2019
Published in print: Jun 1, 2019
Discussion open until: Sep 8, 2019
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