Photocatalytic degradation of ethylene over thin films of titania supported on glass rings

Sirisuk, Akawat; Hill, Charles G.; Anderson, Marc A.

doi:10.1016/s0920-5861(99)00177-7

Cited by 79 publications

(50 citation statements)

References 9 publications

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“…11 Consequently, various types of photocatalytic reactors with immobilized titanium dioxide have been made; for example,¯uidized-bed type, 12 TiO 2 -coated ®ber optic cable type, 13 multiple tube type, 14 swirl-¯ow type, 15 annular-¯ow type, 16 packed-bed type, 17 rotating disk type, 18,19 corrugated-plate type, 20¯a t sheet polymeric membrane type, 21 thin ®lm cascade reactor type, 22 continuous¯ow bubble column type, 23 and falling ®lm type. 24 Some more improvements, however, are necessary to achieve the practical application of the photocatalytic reactors.…”

Section: ±10mentioning

confidence: 99%

Decomposition of formic acid in a photocatalytic reactor with a parallel array of four light sources

Wang

Shiraishi

Nakano

2002

J of Chemical Tech & Biotech

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Section: ±10mentioning

confidence: 99%

Decomposition of formic acid in a photocatalytic reactor with a parallel array of four light sources

Wang

Shiraishi

Nakano

2002

J of Chemical Tech & Biotech

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“…Recent studies have suggested some processes for treating ethylene-containing air, including photocatalytic oxidation (Fu et al, 1996;Krishnankutty et al, 1996;Obee and Hay, 1997;Sirisuk et al, 1999;Yamazaki et al, 1999;Zorn et al, 2000;Rojluechai et al, 2007), biofiltration (Kim, 2003), adsorption (Chen et al, 1999), and cyclic adsorption-catalytic degradation processes (Kim et al, 2005). However, the degradation of ethylene using a TiO 2 photocatalyst in an actual environment with humidity is difficult because the degradation rate decreases with increasing relative humidity (Obee and Hay, 1997) due to the strong hydrophobicity of ethylene (Henry's law constant for solubility in water = 0.0048 mol/kg/bar at 298.15 K) (NIST Chemistry Web Book, 2012).…”

Section: Introductionmentioning

confidence: 99%

Removal of Ethylene and Secondary Organic Aerosols Using UV-C254 + 185 nm with TiO2 Catalyst

Chang

Sekiguchi

Wang

et al. 2013

Aerosol Air Qual. Res.

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In this investigation we evaluated the feasibility and effectiveness of ozone-producing UV (254 + 185 nm) irradiation and a TiO 2 photocatalyst for degradation of ethylene, which is strongly hydrophobic and does not decompose easily in a humid environment. Tests were performed in a photoreactor (V = 0.55 L) under UV irradiation at various wavelengths (365, 254 and 254 + 185 nm), relative humidities (RH < 1% and RH > 86%), atmospheres (pure N 2 and air), residence times (11-33 sec), initial ethylene concentrations in the range of 25-105 ppmv and TiO 2 contact areas (86.4-259 cm 2 ) with presumably ambient pressure and temperature.The experimental results demonstrated that the use of TiO 2 under 254 + 185 nm UV irradiation significantly enhanced the photodegradation of ethylene compared to the case of UV irradiation alone, due to the synergistic effect of photochemical oxidation in the gas phase and photocatalytic oxidation on the TiO 2 surface. Photodegradation induced with 254 + 185 nm UV irradiation was compared with photodegradation induced with UV irradiation at wavelengths of 365 and 254 nm. The highest conversion and mineralization levels were obtained with 254 + 185 nm UV irradiation among the three tested UV sources. Moreover, irradiating with 254 +185 nm light generated secondary organic aerosols (SOA) via gas-to-particle conversion of organic compounds in the air stream. The results indicate that the concentration of generated SOAs decreased in the presence of the TiO 2 catalyst, and thus that TiO 2 may be used to effectively control the emissions of undesirable SOAs.In an application test, for photocatalytic oxidation with 254 + 185 nm UV irradiation, corresponding to a flow rate of 0.5 L/min, and an initial concentration of 34 ppmv, over 90% of the inlet ethylene could be degraded.

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“…A major problem associated with using unsupported photocatalysts in a photoreactor is that a large amount of catalyst is needed, but only the thin exterior layer of the typical unsupported photocatalyst actually absorbs UV light. Consequently, only a small fraction of the solid is active with respect to its capability to bring about photocatalytic reactions (Sirisuk et al 1999).…”

Section: Introductionmentioning

confidence: 99%

“…The possible solutions to this problem involve the use of a thin layer of titanium coated on a variety of supports such as glass rings, aluminium sheets, silica, ceramics and magnesia (Sirisuk et al 1999). The common disadvantage of the attached photocatalysts is their reduced photocatalytic activity due to the reduced contact surface and, often, the screening effect of the water layer above the catalyst.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic oxidation of humic substances with TiO2-coated glass micro-spheres

Portjanskaja¹,

Krichevskaya²,

Preis

et al. 2004

Environ Chem Lett

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The photocatalytic oxidation of humic substances in aqueous solutions and natural waters with TiO 2 attached to buoyant, hollow glass micro-spheres was studied. A maximum oxidation efficiency of 3.6 mg W 1 h 1 was achieved in neutral or alkaline media at a plane surface concentration of the catalyst attached to the micro-spheres of 25 g m 2 . Proceeding by different mechanisms in acidic and alkaline media, the photocatalytic oxidation efficiency did not benefit from an excessive presence of hydroxyl radical promoters, hydrogen peroxide and alkali.

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Photocatalytic degradation of ethylene over thin films of titania supported on glass rings

Cited by 79 publications

References 9 publications

Decomposition of formic acid in a photocatalytic reactor with a parallel array of four light sources

Decomposition of formic acid in a photocatalytic reactor with a parallel array of four light sources

Removal of Ethylene and Secondary Organic Aerosols Using UV-C254 + 185 nm with TiO2 Catalyst

Photocatalytic oxidation of humic substances with TiO2-coated glass micro-spheres

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