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.

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 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 [...]

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

How low-cost air pollution sensors could make homes smarter?

2021 ◽  
Author(s):  
Hamid Omidvarborna ◽  
Prashant Kumar
Keyword(s):  
Air Pollution ◽  
Indoor Air ◽  
Air Pollutants ◽  
Indoor Air Pollution ◽  
Prediction Models ◽  
Disease Risk ◽  
Low Cost ◽  
Mortality And Morbidity ◽  
Spatio Temporal ◽  
Indoor Air Pollutants

<p>The majority of people spend most of their time indoors, where they are exposed to indoor air pollutants. Indoor air pollution is ranked among the top ten largest global burden of a disease risk factor as well as the top five environmental public health risks, which could result in mortality and morbidity worldwide. The spent time in indoor environments has been recently elevated due to coronavirus disease 2019 (COVID-19) outbreak when the public are advised to stay in their place for longer hours per day to protect lives. This opens an opportunity to low-cost air pollution sensors in the real-time Spatio-temporal mapping of IAQ and monitors their concentration/exposure levels indoors. However, the optimum selection of low-cost sensors (LCSs) for certain indoor application is challenging due to diversity in the air pollution sensing device technologies. Making affordable sensing units composed of individual sensors capable of measuring indoor environmental parameters and pollutant concentration for indoor applications requires a diverse scientific and engineering knowledge, which is not yet established. The study aims to gather all these methodologies and technologies in one place, where it allows transforming typical homes into smart homes by specifically focusing on IAQ. This approach addresses the following questions: 1) which and what sensors are suitable for indoor networked application by considering their specifications and limitation, 2) where to deploy sensors to better capture Spatio-temporal mapping of indoor air pollutants, while the operation is optimum, 3) how to treat the collected data from the sensor network and make them ready for the subsequent analysis and 4) how to feed data to prediction models, and which models are best suited for indoors.</p>

Human exposure to indoor air pollutants in sleep microenvironments: A literature review

2017 ◽  
Vol 125 ◽  
pp. 528-555 ◽  
Author(s):  
Brandon E. Boor ◽  
Michal P. Spilak ◽  
Jelle Laverge ◽  
Atila Novoselac ◽  
Ying Xu
Keyword(s):  
Literature Review ◽  
Indoor Air ◽  
Air Pollutants ◽  
Human Exposure ◽  
Indoor Air Pollutants

Asthma‐related outcomes associated with indoor air pollutants among schoolchildren from four informal settlements in two municipalities in the Western Cape Province of South Africa

Indoor Air ◽  
2018 ◽  
Vol 29 (1) ◽  
pp. 89-100 ◽  
Author(s):  
Toyib Olaniyan ◽  
Mohamed Aqiel Dalvie ◽  
Martin Röösli ◽  
Rajen Naidoo ◽  
Nino Künzli ◽  
...  
Keyword(s):  
South Africa ◽  
Indoor Air ◽  
Air Pollutants ◽  
Informal Settlements ◽  
Western Cape ◽  
Western Cape Province ◽  
Indoor Air Pollutants
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