Feasibility of Silver Doped TiO2/Glass Fiber Photocatalyst under Visible Irradiation as an Indoor Air Germicide

Pham, Thanh-Dong; Lee, Byeong–Kyu

doi:10.3390/ijerph110303271

Cited by 54 publications

(21 citation statements)

References 54 publications

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“…The number of active sites could capture photo generated electron probably fell down with further increase in Ag percentage i.e. for 1.5 and 2% (w/w) Ag-doping [21]. EY sensitized Ag-doped TiO 2 (TiO 2 /Ag-1.0/EY) showed the highest absorbance with a maxima at 450 nm due to dye coloration.…”

Section: Resultsmentioning

confidence: 98%

Fabrication and characterization of Ag-doped titania: impact of dye-sensitization, phenol decomposition kinetics and biodegradability index

Behera

Rao

Das

et al. 2015

Desalination and Water Treatment

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A B S T R A C THeterogeneous photocatalytic wastewater treatment using TiO 2 is a well-accepted technique under UV light illumination. Different strategies are employed to modify TiO 2 for shifting its photo-response to the visible light. In this work, Ag-doped TiO 2 nano-composites were synthesized by UV photo-reduction method to narrow down the band gap energy. Further, dye sensitization was performed using Eosin Yellowish to find out its influence on phenol decomposition. Synthesized catalysts were characterized using diffuse UV-vis spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy (TEM), Brunner Emmer Teller (BET) area and zeta-potential measurements. Nanowire like structure was observed with 30-70 nm in diameter from TEM images. BET surface area was decreased considerably with Ag-doping (maximum 31.6%) and dye sensitization (40.6%). Ag concentration and solution pH showed dramatic impact on phenol decomposition with maximum 87% at pH 7, Ag-loading 1% (w/w) and catalyst dose 0.5 g L −1 . Practically no positive synergy was noted with dye sensitization even though the photo-responses were moved intensely to the visible region. The pseudo-first order kinetic exhibited sound agreement to the experimental results with correlation coefficient ≥0.98. Moreover, the enhancement of biodegradability is investigated in terms of biochemical to chemical oxygen demand.

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Section: Resultsmentioning

confidence: 98%

Fabrication and characterization of Ag-doped titania: impact of dye-sensitization, phenol decomposition kinetics and biodegradability index

Behera

Rao

Das

et al. 2015

Desalination and Water Treatment

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“…Among these strategies, metals or non-metals as doping agents to enhance the photocatalytic activity of TiO 2 have been frequently used [17][18][19][20][21]. In our previous studies, we used Ag as a doping and sensitization to enhance the photocatalytic activity of TiO 2 deposited on glass fiber [22][23][24]. The synthesized photocatalysts exhibited high photocatalytic disinfection activity in removing Escherichia coli (E. coli) and Staphylococcus (Staph) in bioaerosols under visible light.…”

Section: Introductionmentioning

confidence: 99%

Novel integrated approach of adsorption and photo-oxidation using Ag–TiO2/PU for bioaerosol removal under visible light

Pham

Lee

2015

Chemical Engineering Journal

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h i g h l i g h t sThe photocatalytic activity of TiO 2 was enhanced by Ag metal doping. TiO 2 and Ag-doped TiO 2 were coated on porous polyurethane (PU) using C-Si-O-Ti bonds. Increased adsorption ability of the photocatalyst was due to the porosity of the PU. Removal of E. coli from an aerosol was only by adsorption with PU and TiO 2 /PU. Under visible light, E. coli was removed by adsorption and photo-oxidation with Ag-TiO 2 /PU. a b s t r a c tWe investigated a novel approach by synthesizing an integrated material, which could act as both adsorbent and photocatalytic material, for bioaerosol purification under visible light conditions. Ag was used as a dopant agent to enhance photocatalytic activity of TiO 2 , leading to high photocatalytic activity of the doped TiO 2 even under visible light. Under visible light, the doped TiO 2 photocatalyst could produce oxy radicals, oxidative agents, that participate in oxidation reactions to decompose important organic components of bacteria, leading to death or removal of bacteria from an aerosol. Adsorption property was integrated into the enhanced TiO 2 photocatalyst by using polyurethane (PU), a honeycomb structure material, as a substrate for coating process of the doped TiO 2 . Three materials including pristine PU, TiO 2 coating on PU (TiO 2 /PU), and Ag-doped TiO 2 coating on PU (Ag-TiO 2 /PU) were used to remove Escherichia coli in an aerosol under visible light. Under dark conditions, the removal capacities of E. coli in the aerosol by PU, TiO 2 /PU, and Ag-TiO 2 /PU were 1.2 Â 10 5 , 2.7 Â 10 5 , and 6.2 Â 10 5 (CFU/cm 3 ), respectively. Under visible light irradiation, the removal capacities of E. coli in an aerosol by PU, TiO 2 /PU, and Ag-TiO 2 /PU were 1.2 Â 10 5 , 2.7 Â 10 5 , and 1.8 Â 10 6 (CFU/cm 3 ), respectively. The improvement of the removal capacity by TiO 2 /PU and Ag-TiO 2 /PU, versus PU, is due to adsorption alone and the combination of adsorption plus photocatalytic activity, respectively.

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“…and O are three main elements in the sample. Pham and Lee16 indicated that the peaks (at 368.14 eV and 374.16 eV) represent the silver ions (Ag + ) and the two peaks (at 369.21 eV and 375.27 eV) represent the silver metal (Ag o ). The two big peaks located at 368.14 eV and 374.16 eV represent silver metal (Ag o ) and the two small peaks, located at 369.21 eV and 375.27 eV represent silver oxide (Ag2O)15 .…”

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confidence: 99%

Generation of silver titania nanoparticles from an Ag–Ti alloy via picosecond laser ablation and their antibacterial activities

Hamad

Liu

et al. 2015

RSC Adv.

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In this work, a bulk Ti/Ag alloy was used, for the first time, to produce Ag-TiO 2 compound nanoparticles using picosecond laser ablation in deionised water. Spherical Ag-TiO 2 compound nanoparticles with an average size of 31 nm were produced. They were characterised using a UV-VIS spectrometer, transmission electron microscopy (TEM), High-Angle Annular Dark-Field -Scanning Transmission Electron Microscopy (HAADF-STEM), Energy Dispersive X-ray Spectroscopy (EDS), X-ray Photoelectron Spectroscopy (XPS) and X-ray Diffraction (XRD) methods to identify the nanoparticle size distribution, morphology, chemical composition, phase and surface properties. It was found that Ag-doped TiO 2 nanoparticles were produced. . The optical absorption spectra of the Ag-TiO 2 compound nanoparticles shifted to longer wavelengths. The antibacterial activity of the Ag-TiO 2 compound nanoparticles against gram-negative Escherichia coli (E. coli) bacteria was examined and compared with those using laser generated Ag and TiO 2 nanoparticles and distilled deionised water. It was found that the antibacterial activity of the Ag-TiO 2 compound nanoparticles was better than laser generated TiO 2 nanoparticles and chemically produced Ag nanoparticles, and was almost as good as laser generated Ag nanoparticles while Ag-TiO2 having used at much lower Ag concentration. The reason behind this is discussed.

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Feasibility of Silver Doped TiO2/Glass Fiber Photocatalyst under Visible Irradiation as an Indoor Air Germicide

Cited by 54 publications

References 54 publications

Fabrication and characterization of Ag-doped titania: impact of dye-sensitization, phenol decomposition kinetics and biodegradability index

Fabrication and characterization of Ag-doped titania: impact of dye-sensitization, phenol decomposition kinetics and biodegradability index

Novel integrated approach of adsorption and photo-oxidation using Ag–TiO2/PU for bioaerosol removal under visible light

Generation of silver titania nanoparticles from an Ag–Ti alloy via picosecond laser ablation and their antibacterial activities

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