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Advanced removal of C. famata in bioaerosols by simultaneous adsorption and photocatalytic oxidation of Cu-doped TiO2/PU under visible irradiation.

ABSTRACT: 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 × 105, 3.2 × 105 and 6.9 × 105 (CFU/cm3) under dark condition and 1.5 × 105, 3.3 × 105 and 1.8 × 106 (CFU/cm3) 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.

SUBMITTER: Pham TD

PROVIDER: S-EPMC7108340 | biostudies-literature | 2016 Feb

REPOSITORIES: biostudies-literature

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Advanced removal of C. famata in bioaerosols by simultaneous adsorption and photocatalytic oxidation of Cu-doped TiO2/PU under visible irradiation.

Pham Thanh-Dong TD Lee Byeong-Kyu BK

Chemical engineering journal (Lausanne, Switzerland : 1996) 20151104

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< ...[more]

PMID: 32288625

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Project description:Background purposePhotocatalytic water splitting for hydrogen evolution is a potential way to solve many energy and environmental issues. Developing visible-light-active photocatalysts to efficiently utilize sunlight and finding proper ways to improve photocatalytic activity for H2 evolution have always been hot topics for research. This study attempts to expand the use of sunlight and to enhance the photocatalytic activity of TiO2 by N doping and Au loading.MethodsAu/N-doped TiO2 photocatalysts were synthesized and successfully used for photocatalytic water splitting for H2 evolution under irradiation of UV and UV-vis light, respectively. The samples were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (DRS), photoluminescence spectroscopy (PL), and photoelectrochemical characterizations.ResultsDRS displayed an extension of light absorption into the visible region by doping of N and depositing with Au, respectively. PL analysis indicated electron-hole recombination due to N doping and an efficient inhibition of electron-hole recombination due to the loaded Au particles. Under the irradiation of UV light, the photocatalytic hydrogen production rate of the as-synthesized samples followed the order Au/TiO2 > Au/N-doped TiO2 > TiO2 > N-doped TiO2. While under irradiation of UV-vis light, the N-TiO2 and Au/N-TiO2 samples show higher H2 evolution than their corresponding nitrogen-free samples (TiO2 and Au/TiO2). This inconsistent result could be attributed to the doping of N and the surface plasmonic resonance (SPR) effect of Au particles extending the visible light absorption. The photoelectrochemical characterizations further indicated the enhancement of the visible light response of Au/N-doped TiO2.ConclusionComparative studies have shown that a combination of nitrogen doping and Au loading enhanced the visible light response of TiO2 and increased the utilization of solar energy, greatly boosting the photocatalytic activity for hydrogen production under UV-vis light.

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Advanced removal of C. famata in bioaerosols by simultaneous adsorption and photocatalytic oxidation of Cu-doped TiO2/PU under visible irradiation.

Publications

Advanced removal of <i>C. famata</i> in bioaerosols by simultaneous adsorption and photocatalytic oxidation of Cu-doped TiO<sub>2</sub>/PU under visible irradiation.

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