title: Effect of binders on airborne microorganism inactivation using TiO2 photocatalytic fluorescent lamps.
abstract: 5% Degussa P25 TiO2 was spray-coated onto black-light and white-light fluorescent lamps, using five different binders, namely DURAMAX B-1000, DURAMAX D-3005, silane-69, and two polyethylene glycols with molecular weight 1000 (PEG-1000) and 700 (PEG-700). The coated lamps were tested with Staphylococcus epidermidis, Escherichia coli, spores of Bacillus subtilis and spores of Aspergillus niger. It was found that 0.5% B-1000 and 1% PEG-1000 gave the highest inactivation rates: 93-96% from coated black-light lamps and 85-88% from coated white-light lamps for bacteria. In the case of spores, 70-72% and 55-57% inactivation rates were recorded from coated black-light and coated white-light lamps, respectively. The effects of UVA irradiance and face velocity were also examined. Significant improvement was observed from coated white-light lamps when the UVA irradiance increased. High face velocity adversely affected microorganism inactivation.
authors.affiliation: Program in Biomedical Sciences, Khon Kaen University, Thailand.
authors.forename: Krisaneeya
authors.initials: K
authors.lastname: Sungkajuntranon
authors.affiliation: Centre for Research and Development of Medical Diagnostic Laboratories, Faculty of Associated Medical Sciences, Khon Kaen University, Thailand.
authors.forename: Pipat
authors.initials: P
authors.lastname: Sribenjalux
authors.affiliation: National Metal and Materials Technology Center, National Science and Technology Development Agency, Thailand.
authors.forename: Sitthisuntorn
authors.initials: S
authors.lastname: Supothina
authors.affiliation: Department of Environmental Science, Faculty of Science and Technology, Thammasat University, Thailand. Electronic address: paradee@tu.ac.th.
authors.forename: Paradee
authors.initials: P
authors.lastname: Chuaybamroong
mesh_terms: D000391:Air Microbiology; D001234:Aspergillus niger / Q000502:physiology; D001412:Bacillus subtilis / Q000502:physiology; D001419:Bacteria / Q000528:radiation effects*; D002384:Catalysis; D004926:Escherichia coli / Q000528:radiation effects; D005658:Fungi / Q000528:radiation effects*; D008027:Light; D011092:Polyethylene Glycols / Q000737:chemistry; D012821:Silanes / Q000737:chemistry; D013171:Spores, Bacterial / Q000528:radiation effects; D013172:Spores, Fungal / Q000528:radiation effects; D013212:Staphylococcus epidermidis / Q000528:radiation effects; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D012821:Silanes; C009495:titanium dioxide; D011092:Polyethylene Glycols; D014025:Titanium
keywords: Acrylic polymer; Binder; Dispersant; Microorganism removal; Spray-coating; TiO(2)-coated lamp