Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 493, Issue -, Pages 291-297Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2014.06.002
Keywords
Activated carbon fiber (ACE) filter; Sophora flavescens; Air filtration; Nanoparticles
Categories
Funding
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning, South Korea [2013K000386]
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Activated carbon fiber (ACF) filters have a wide range of applications, including air purification, dehumidification, and water purification, due to their large specific surface area, high adsorption capacity and rate, and specific surface reactivity. However, when airborne microorganisms such as bacteria and fungi adhere to the carbon substrate, ACF filters can become a source of microbial contamination, and their filter efficacy declines. Antimicrobial treatments are a promising means of preventing ACF bio-contamination. In this study, we demonstrate the use of Sophora flavescens in antimicrobial nanoparticles coated onto ACF filters. The particles were prepared using an aerosol process consisting of nebulization-thermal drying and particle deposition. The extract from S. flavescens is an effective, natural antimicrobial agent that exhibits antibacterial activity against various pathogens. The efficiency of Staphylococcus epidermidis inactivation increased with the concentration of S. flavescens nanoparticles in the ACF filter coating. The gas adsorption efficiency of the coated antimicrobial ACF filters was also evaluated using toluene. The toluene-removal capacity of the ACF filters remained unchanged while the antimicrobial activity was over 90% for some nanoparticle concentrations. Our results provide a scientific basis for controlling both bioaerosol and gaseous pollutants using antimicrobial ACF filters coated with S. flavescens nanopartides. (C) 2014 Elsevier BM. All rights reserved.
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