Photodegradation of volatile organic compounds (VOCs) and NO for indoor air purification using TiO2: promotion versus inhibition effect of NO

Ao, C.H.; Lee, Shuncheng; Mak, Chee Leung; Чан, Лю

doi:10.1016/s0926-3373(02)00219-9

Cited by 205 publications

(108 citation statements)

References 31 publications

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“…23,24 The sensitivity ͑S͒ is defined as S = R a / R g , where R a is the electrical resistance in atmospheric air ͑ϳ22% relative humidity͒ and R g the resistance of the fiber mats in CO-air mixed gas. The sensitivity was evaluated according to the resistance variation under a dc voltage of 3 V. Air mixed with a given concentration of CO gas was flowed at 3000 ml/ min through the gas chamber at 23.5°C and ambient pressure.…”

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confidence: 99%

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Room temperature gas sensing properties of SnO2/multiwall-carbon-nanotube composite nanofibers

Tao

Wang

et al. 2007

Applied Physics Letters

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Pure SnO 2 and SnO 2 polycrystalline nanofibers doped with multiwall carbon nanotubes ͑MWCNTs͒ are synthesized by electrospinning followed by calcination in air at 500°C. The measurement results by sensors fabricated from these fiber mats at steady state show that the n-type SnO 2 /MWCNT nanofibers are able to detect carbon monoxide at 50 ppm at room temperature, while the pure SnO 2 nanofibers are insensitive up to 500 ppm. The MWCNT doped SnO 2 nanofibers have demonstrated their potentials for wearable room temperature gas sensors with low cost and power consumption.

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confidence: 99%

“…The concentration of CO was continuously measured by a chemiluminescene CO analyzer. 24 After the inlet and outlet concentration achieved equilibrium ͑1 h͒, the electrochemical interface was turned on and recorded the data.…”

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confidence: 99%

Room temperature gas sensing properties of SnO2/multiwall-carbon-nanotube composite nanofibers

Tao

Wang

et al. 2007

Applied Physics Letters

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“…Further research of the so-called heterogeneous photocatalysis by TiO 2 relied on the use of this substance for decomposing environmental pollutions (Górska 2009, Ramirez et al 2010. At present, the possibility of applying the heterogeneous photocatalysis using TiO 2 is being used to eliminate organic pollutants from air, water and sewers (Hoffmann et al 1995, Wang et al 1999, Frazer 2001, Ao et al 2003, Devahasdin et al 2003) and in the processes of self-purification of surfaces (Wang et al 1999, Giergiczny & Sokołowski 2009, Langridge et al 2009). …”

Section: Titanium In the Industrymentioning

confidence: 99%

“…Heterogeneous photocatalysis allows the disintegration of organic compounds present in air, waters or sewers to CO 2 , water and inorganic acids (Hager & Bauer 1999, Herrmann 1999, Wang et al 1999, Frazer 2001. Many examples of catalytic TiO 2 working on the decomposition of organic compounds, i. e. benzene, toluene or BTEX sums, acetic aldehyde, acetone, phenol, formaldehyde, alcohol glycols, organic acids or organic dyes so as methylene blue, Reactive of Roadsteads, Direct Green 99, Acid Orange 7 and others were described in literature (Hager & Bauer 1999, Asahi et al 2001, Ao et al 2003, Strini et al 2005, Górska 2009, Liu et al 2014a, 2014b. The impact of TiO 2 involves the process of decomposition of PAHs, such that simpler organic compounds are formed.…”

Section: Titanium In the Industrymentioning

confidence: 99%

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Titanium compounds and their impact on the transformation of air pollutants

Bok¹,

Bożym²

2015

geol

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Titanium, as a transition metal, demonstrates a high mechanical strength. It is light and corrosion resistant. The estimation of the environmental impact of the use of machine parts that grains are freed from and contact the surface of titanium alloys by wear is buffing. Due to its catalytic action, TiO 2 is nowadays added to asphalt, concrete, exterior paints for elevation, self-cleaning glass and protective coatings. It is also present in clothes, food (E171), cosmetics (CI 77891) and textiles. The research on the toxicity of titanium and its compounds points towards their neutral character, however an adverse impact is also observed in nature. TiO 2 may affect air quality. It promotes free radicals and ozone origination. The properties and direction of the use of titanium compounds and their influence on the circulation of pollutants are described below.

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A review of prospects and challenges of photocatalytic decomposition of volatile organic compounds (VOCs) under humid environment

Masresha,

Jabasingh,

Kebede

et al. 2023

Can J Chem Eng

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Volatile organic compounds (VOCs) are harmful for humans and the surrounding ecosystem. Emissions from these pollutants have caused a significant reduction in air quality, which has an effect on people's health. Alkanes, alkenes, alcohols, aromatics, and other VOC pollutants have all been broken down by TiO2 photocatalytic processes. Due to several operating inefficiencies and deactivation issues in humid environments, the practical application of photocatalysis has not been realized on a broader scale. The effectiveness of photo‐oxidation of VOCs is impacted by a variety of environmental conditions. In the photocatalytic oxidation of the VOCs, relative humidity (RH) is critical. Therefore, it is important to review the recent findings on how humidity affects the photocatalytic breakdown of VOCs in air. To satisfy this need, this work provides a critical review of the related literature with focus on the fundamentals of photocatalysis, photocatalytic degradation of air pollutants, and the influence of humidity on the photocatalytic process degradation for selected air pollutants. It also highlights the kinetic models and typical photocatalytic reactor and supports for VOC removal.

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Photodegradation of volatile organic compounds (VOCs) and NO for indoor air purification using TiO2: promotion versus inhibition effect of NO

Cited by 205 publications

References 31 publications

Room temperature gas sensing properties of SnO2/multiwall-carbon-nanotube composite nanofibers

Room temperature gas sensing properties of SnO2/multiwall-carbon-nanotube composite nanofibers

Titanium compounds and their impact on the transformation of air pollutants

A review of prospects and challenges of photocatalytic decomposition of volatile organic compounds (VOCs) under humid environment

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