Chemical Engineering Journal, Vol.286, 377-386, 2016
Advanced removal of C. famata in bioaerosols by simultaneous adsorption and photocatalytic oxidation of Cu-doped TiO2/PU under visible irradiation
Polyurethane (PU), a honeycomb structure material, was used as a substrate onto which TiO2 and Cu-TiO2 were deposited in order to integrate the adsorption property to the photocatalysts. TiO2 deposited on PU (TiO2/PU) and Cu-doped TiO2 deposited on PU (Cu-TiO2/PU) were synthesized and applied to the removal of Candida famata (C. famata), a frequently encountered airborne yeast. The removal capacities of C famata by PU, TiO2/PU and Cu-TiO2/PU were 1.5 x 10(5), 3.2 x 10(6) and 6.9 x 10(5) (CFU/cm(3)) under dark condition and 1.5 x 10(5), 3.3 x 10(5) and 1.8 x 10(6) (CFU/cm(3)) under visible light irradiation, respectively. PU and TiO2/PU seemed to exhibit only an adsorption ability for removing C famata in aerosols under both dark and visible light. The C famata removal capacity of Cu-TiO2/PU under visible light was increased 2.6-fold compared to that under dark condition. This significant increase was attributed to the Cu dopant, which enhanced the electron-hole separation efficiency and capacity of TiO2, resulting in the high photocatalytic activity of Cu-TiO2/PU under visible light. (C) 2015 Elsevier B.V. All rights reserved.