scholarly journals Solar Photocatalytic Degradation of Typical Indoor Air Pollutants Using TiO2Thin Film Codoped with Iron(III) and Nitrogen

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Shuaijie Wang ◽  
Xingxing Cheng
Keyword(s):  
Indoor Air ◽  
Air Pollutants ◽  
Reaction Rate ◽  
Sol Gel ◽  
Visible Region ◽  
Reaction Rate Constant ◽  
Solar Light ◽  
Photocatalytic Ability ◽  
Vis Spectroscopy ◽  
Indoor Air Pollutants

A type of iron and nitrogen codoped titania thin film was prepared by sol-gel method to degrade three typical indoor air pollutants: formaldehyde (HCHO), ammonia (NH3), and benzene (C6H6) under solar light. X-ray diffraction (XRD), UV-Vis spectroscopy, and energy dispersive spectra (EDS) were employed to characterize the photocatalysts. The results showed that the Fe/N codoped TiO2had a stronger absorption in the visible region than pure, Fe-doped, and N-doped TiO2and exhibited excellent photocatalytic ability for the degradation of indoor HCHO, NH3, and C6H6. When the three pollutants existed in indoor air at the same time, the removal percentages of HCHO, NH3, or C6H6after 6 h photocatalytic reaction under solar light reached 48.8%, 50.6%, and 32.0%. The degradation reaction of the three pollutants followed the pseudo-first-order kinetics with the reaction rate constants in the order of 0.110 h−1for ammonia, 0.109 h−1for formaldehyde, and 0.060 h−1for benzene. The reaction rate constant decreased with the increase of initial reactant concentration, which reflected that there was oxidation competition between the substrate and its intermediate during the photocatalytic process.

scholarly journals Degradation of Typical Indoor Air Pollutants Using Fe-Doped TiO2Thin Film under Daylight Illumination

2014 ◽  
Vol 2014 ◽  
pp. 1-5
Author(s):  
Shuaijie Wang ◽  
Hao Yu ◽  
Xingxing Cheng
Keyword(s):  
Thin Film ◽  
Sol Gel ◽  
Visible Region ◽  
Preparation Condition ◽  
Solar Light ◽  
Photocatalytic Reaction ◽  
X Ray Diffraction ◽  
Vis Spectroscopy ◽  
Doped Titania ◽  
Indoor Air Pollutants

A type of iron-doped titania thin film was prepared by means of sol-gel method to degrade indoor formaldehyde (HCHO), ammonia (NH3), and benzene (C6H6) under sunlight. The photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-Vis spectroscopy, and energy dispersive spetra (EDS). The results showed that the iron was doped in the TiO2photocatalyst successfully. The absorption edge of doped TiO2had red shifts and the doped TiO2had a stronger absorption than the pure TiO2in the visible region. Fe-doped TiO2thin film prepared with the optimal preparation condition could remove indoor HCHO, NH3and C6H6effectively under solar light irradiation. The removal percentage of HCHO, NH3or C6H6after 9 h photocatalytic reaction under solar light reached 55%, 53.1%, and 37.5%, respectively, when they existed in the air individually. When the three pollutants were mixed in the air, the removal percentage decreased to 33.3%, 28.3%, and 28%. The degradation reaction of the three pollutants followed the pseudo first-order kinetics, which reflects that the photocatalytic reaction was controlled by the surface chemical reaction and the reaction rate was controlled by concentration of reactants.

scholarly journals Removal of Formaldehyde Using Highly Active Pt/TiO2Catalysts without Irradiation

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Haibao Huang ◽  
Huiling Huang ◽  
Peng Hu ◽  
Xinguo Ye ◽  
Dennis Y. C. Leung
Keyword(s):  
Indoor Air ◽  
Air Pollutants ◽  
Active Sites ◽  
Room Temperature ◽  
Sol Gel ◽  
Pt Nanoparticles ◽  
Highly Active ◽  
Supported Pt Catalysts ◽  
Activation Of Oxygen ◽  
Indoor Air Pollutants

Formaldehyde (HCHO) is one of the major indoor air pollutants. TiO2supported Pt catalysts were prepared by sol-gel method and used to eliminate HCHO at room temperature without irradiation. The reduced Pt/TiO2catalyst (denoted as Pt/TiO2-H2) showed much higher activity than that calcined in air (denoted as Pt/TiO2-air). More than 96% of the conversion of HCHO was obtained over 0.5 wt% Pt/TiO2-H2, on which highly dispersed metallic Pt nanoparticles with very small size (~2 nm) were identified. Metallic Pt rather than cationic Pt nanoparticles provide the active sites for HCHO oxidation. Negatively charged metallic Pt nanoparticles facilitate the transfer of charge and oxygen species and the activation of oxygen.

Degradation of Indoor Ammonia Using TiO2 Thin Film Doped with Iron(III) under Visible Light Illumination

2013 ◽  
Vol 668 ◽  
pp. 136-139
Author(s):  
Shuai Jie Wang ◽  
Hao Yu ◽  
Xue Qin Gao
Keyword(s):  
Thin Film ◽  
Visible Light ◽  
Tio2 Thin Film ◽  
Sol Gel ◽  
Visible Region ◽  
Reaction Rate Constant ◽  
Light Illumination ◽  
Doping Amount ◽  
Doped Tio2 ◽  
Vis Spectroscopy

A type of titania thin film doped with iron(III) was prepared by means of sol-gel method to degrade indoor ammonia (NH3) under visible light irradiation. The photocatalysts was characterized by X-ray diffraction (XRD) and UV-vis spectroscopy. The results demonstrated that the adsorption edge of doped TiO2 thin film had red shifts and the doped TiO2 thin film had a stronger absorption than undoped TiO2 thin film in the visible region. Doping amount of Fe(III) effected the photocatalytic actitivity of Fe-doped TiO2 thin film significantly. The optimal doping amount of Fe(III) was 1%(mole fraction). Using the optimal Fe-doped TiO2 thin film, the removal percentage of NH3 after 9h phtocatalytic reaction under visible light reached 53.1%. The degradation reaction of NH3 was successfully described by the pseudo first-order kinetics. The reaction rate constant decreased with the increase of initial concentration of NH3, which reflected that there was oxidation competition between NH3 and its intermediate during the photocatalytic process.

scholarly journals Exposure and Health Impacts Related to Outdoor and Indoor Air Pollutants

Atmosphere ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 105
Author(s):  
Haider A. Khwaja
Keyword(s):  
Indoor Air ◽  
Air Pollutants ◽  
Health Impacts ◽  
Special Issue ◽  
Indoor Air Pollutants ◽  
Selection Of

The five papers included in this Special Issue represent a diverse selection of contributions [...]

Photocatalytic Degradation of Methylene Blue by NiO Thin Films under Solar Light Irradiation

2019 ◽  
Vol 56 ◽  
pp. 152-157 ◽  
Author(s):  
Abdelouahab Noua ◽  
Hichem Farh ◽  
Rebai Guemini ◽  
Oussama Zaoui ◽  
Tarek Diab Ounis ◽  
...  
Keyword(s):  
Thin Films ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Sol Gel ◽  
Visible Region ◽  
Optical Transmittance ◽  
Dip Coating ◽  
Light Irradiation ◽  
Solar Light ◽  
Solar Light Irradiation

Nickel oxide (NiO) thin films were successfully deposited by sol-gel dip-coating method on glass substrates. The structural, morphological and optical properties in addition to the photocatalytic activity of the prepared films were investigated. The results show that the films have a polycrystalline NiO cubic structure with dense NiO grains and average optical transmittance in the visible region. The photocatalytic properties of the films were studied through the degradation of methylene blue and 89% of degradation was achieved for 4.5h of solar light irradiation exposure which indicates the capability of NiO photocatalytic activity.

Risk assessment of exposure to indoor air pollutants

1990 ◽  
Vol 11 (4) ◽  
pp. 295-302 ◽  
Author(s):  
J. J. McAughey ◽  
J. N. Pritchard ◽  
A. Black
Keyword(s):  
Risk Assessment ◽  
Indoor Air ◽  
Air Pollutants ◽  
Indoor Air Pollutants
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