title: Portable photocatalytic air cleaners: efficiencies and by-product generation.
abstract: Portable photocatalytic air cleaners were investigated in 24 and 48 m(3) emission test chambers with regard to efficiency and by-product generation. For this purpose, formaldehyde, decane, 1,2-dichlorobenzene, toluene, α-pinene and heptanal were doped at sub-ppm concentration levels into the chambers individually and in mixtures. By way of specified test protocols, efficiencies could be distinguished but were strongly dependant on the choice of test compounds, especially on whether single or multi compound dosing was used, and on long-term effects. Initial clean air delivery rates (CADRs) up to 137 m(3)/h were measured. Typical by-products were found in significant concentrations. The main ones were formaldehyde up to 50 ppb (62 μg/m(3)) and acetone up to 80 ppb (190 μg/m(3)). Other aldehydes were also found, but at smaller levels. The detection of chloroacetone, a strong irritating compound, at concentrations up to 15 ppb (57 μg/m(3)) strengthens the importance of such investigations especially in cases were chloro-organic compounds are involved.
authors.affiliation: Fraunhofer WKI, Bienroder Weg 54E, 38108, Braunschweig, Germany. jan.gunschera@wki.fraunhofer.de.
authors.forename: Jan
authors.initials: J
authors.lastname: Gunschera
authors.affiliation: Fraunhofer WKI, Bienroder Weg 54E, 38108, Braunschweig, Germany.
authors.forename: Doreen
authors.initials: D
authors.lastname: Markewitz
authors.affiliation: Fraunhofer WKI, Bienroder Weg 54E, 38108, Braunschweig, Germany.
authors.forename: Birger
authors.initials: B
authors.lastname: Bansen
authors.affiliation: Fraunhofer WKI, Bienroder Weg 54E, 38108, Braunschweig, Germany.
authors.forename: Tunga
authors.initials: T
authors.lastname: Salthammer
authors.affiliation: Beijing Academy of Science and Technology (BJAST), No.27, W.3rd Ring Rd North, Beijing, 100089, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Ding
mesh_terms: D000096:Acetone / Q000031:analogs & derivatives* / Q000032:analysis / Q000528:radiation effects; D000389:Air Conditioning / Q000295:instrumentation / Q000379:methods*; D000393:Air Pollutants / Q000032:analysis* / Q000528:radiation effects; D016902:Air Pollution, Indoor / Q000032:analysis*; D000447:Aldehydes / Q000032:analysis / Q000528:radiation effects; D000081008:Bicyclic Monoterpenes; D002384:Catalysis; D002722:Chlorobenzenes / Q000032:analysis / Q000528:radiation effects; D005557:Formaldehyde / Q000032:analysis* / Q000528:radiation effects; D039821:Monoterpenes / Q000032:analysis / Q000528:radiation effects; D014466:Ultraviolet Rays
chemical_list: D000393:Air Pollutants; D000447:Aldehydes; D000081008:Bicyclic Monoterpenes; D002722:Chlorobenzenes; D039821:Monoterpenes; D000096:Acetone; D005557:Formaldehyde; C006973:chloroacetone; C004726:2-dichlorobenzene; C046204:heptanal; C005451:alpha-pinene
keywords: Air cleaners; By-products; Efficiency; Emission test chambers; PCO