Photocatalytic degradation of volatile organic compounds at the gas–solid interface of a TiO2 photocatalyst

Kim, Sang Bum; Hwang, Hyun Tae; Hong, Sung Chang

doi:10.1016/s0045-6535(02)00101-7

Cited by 130 publications

(54 citation statements)

References 18 publications

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“…The formation of this type of aggregate has been described frequently in TiO 2 thin film reactors. 9,13 The second type of particle was smaller and included those attached to the fiberglass. These particles were usually found grouped together to form units varying in size but usually less than 1-2 µm in diameter.…”

Section: Reagents and Photocatalystsmentioning

confidence: 99%

“…The effect of RH on the degradation of oxygenated compounds appears less frequently in the literature. The impact of water in the degradation of methanol, 9 acetone, 13,21 formaldehyde 25 and propanol 5 has been described. Most of these studies detailed a similar behaviour: at low levels of water content RE increased with increasing RH, and at high RH the opposite effect was generally observed.…”

Section: Effect Of Relative Humidity Of Air On the Conversion Of Vocsmentioning

confidence: 99%

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UV photocatalytic oxidation of paint solvent compounds in air using an annular TiO2-supported reactor

Palau

Penya‐Roja

Gabaldón

et al. 2010

J. Chem. Technol. Biotechnol.

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BACKGROUND: One of the most important industrial sources of volatile organic compounds (VOCs) is related to coating and painting applications. In this sense, photocatalytic oxidation can become an innovative and promising alternative for the remediation of air polluted by VOCs. In this study the UV photodegradation of m-xylene, toluene and n-butyl acetate, as representative compounds of paint solvents, was carried out in an annular reactor using a TiO 2 -glass wool supported catalyst.

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Section: Reagents and Photocatalystsmentioning

confidence: 99%

Section: Effect Of Relative Humidity Of Air On the Conversion Of Vocsmentioning

confidence: 99%

UV photocatalytic oxidation of paint solvent compounds in air using an annular TiO2-supported reactor

Palau

Penya‐Roja

Gabaldón

et al. 2010

J. Chem. Technol. Biotechnol.

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“…[1] In particular, growing attention is now placed on the study of volatile organic compounds (VOCs), as they have been shown to be a major contributing factor in the formation of lower-atmosphere ozone and are considered to be harmful to human health over long-term exposure. [2] Heterogeneous photocatalytic oxidation has proved to be a promising technique for the remediation of both aqueous and gaseous VOCs. The experimental conditions are mild, requiring only a UV or near-UV light source in the presence of a semiconductor to oxidise the VOCs to carbon dioxide and water.…”

Section: Introductionmentioning

confidence: 99%

Free‐Radical Pathways in the Decomposition of Ketones over Polycrystalline TiO₂: The Role of Organoperoxy Radicals

2006

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The oxidative decomposition of various ketones (including acetone, 2-butanone, 4-heptanone, cyclopentanone and cyclohexanone) over dehydrated TiO(2) (P25) powder is investigated by electron paramagnetic resonance (EPR) spectroscopy. For the first time, a series of thermally unstable radical intermediates are observed both on the activated and reduced TiO(2) surface, depending on the adopted experimental conditions. These radical intermediates are identified as organoperoxy-based species of general formula ROO(.-) and RCO(3) (.-). They are formed by reaction of photogenerated charge carriers (either trapped electrons or trapped holes) with the adsorbed ketones in the presence of molecular oxygen. The organoperoxy intermediates are thermally unstable and decompose at temperatures in the region of 180-250 K. This work demonstrates that free-radical pathways involving both organoperoxy and superoxide radicals can be responsible for the thermal- and photodecomposition of ketones over polycrystalline TiO(2) (P25).

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“…Photocatalytic degradation of trichloroethylene and methanol was more effective at a moderate temperature than at higher temperatures. 23 The yield of acetone from 2-propanol oxidation was maximized at a surface temperature of 77…”

Section: Effect Of Temperaturementioning

confidence: 99%

“…23 The surface coverage of the reactant decreases with increasing temperature. 19,25 Therefore, the photocatalytic rate of 2-propanol was reduced when reaction temperatures were above 100…”

Section: Effect Of Temperaturementioning

confidence: 99%

Characteristics of photocatalytic oxidation of gaseous 2‐propanol using thin‐film TiO₂ photocatalyst

Chang

Chen

2004

J of Chemical Tech & Biotech

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This work presents a photocatalysis-based method to treat and purify air because of its broad applicability to common, oxidizable, air contaminants. The effect of oxygen content, temperature, water vapor, and 2-propanol concentration on the TiO 2 surface was investigated. The rate of 2-propanol decomposition increased with increasing the oxygen content, but was reduced at temperatures higher than 100• C. When water vapor concentration was in the range of 10-355 mmol m −3 , the rate of 2-propanol decomposition was proportional to the water content. However, an opposite result was observed at a higher concentration of water vapor. 2-Propanol was photooxidized to acetone, and eventually to carbon dioxide and water. The kinetic model of 2-propanol photooxidation was successfully developed by the competitive Langmuir-Hinshelwood rate form, incorporating the inhibition effect coming from the formation of acetone.  2004 Society of Chemical Industry Keywords: photocatalysis; titanium dioxide; kinetics; 2-propanol; acetoneReaction rate constant of acetone (mmol m

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Photocatalytic degradation of volatile organic compounds at the gas–solid interface of a TiO2 photocatalyst

Cited by 130 publications

References 18 publications

UV photocatalytic oxidation of paint solvent compounds in air using an annular TiO2-supported reactor

UV photocatalytic oxidation of paint solvent compounds in air using an annular TiO2-supported reactor

Free‐Radical Pathways in the Decomposition of Ketones over Polycrystalline TiO₂: The Role of Organoperoxy Radicals

Characteristics of photocatalytic oxidation of gaseous 2‐propanol using thin‐film TiO₂ photocatalyst

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Photocatalytic degradation of volatile organic compounds at the gas–solid interface of a TiO2 photocatalyst

Cited by 130 publications

References 18 publications

UV photocatalytic oxidation of paint solvent compounds in air using an annular TiO2-supported reactor

UV photocatalytic oxidation of paint solvent compounds in air using an annular TiO2-supported reactor

Free‐Radical Pathways in the Decomposition of Ketones over Polycrystalline TiO2: The Role of Organoperoxy Radicals

Characteristics of photocatalytic oxidation of gaseous 2‐propanol using thin‐film TiO2 photocatalyst

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Free‐Radical Pathways in the Decomposition of Ketones over Polycrystalline TiO₂: The Role of Organoperoxy Radicals

Characteristics of photocatalytic oxidation of gaseous 2‐propanol using thin‐film TiO₂ photocatalyst