Design of an efficient photocatalytic reactor for the decomposition of gaseous organic contaminants in air

Lee, David Minzae; Yun, Hongseok; Yu, Sungju; Yun, Seong Jin; Lee, Sun Young; Kang, Sang Hoon; Yi, Jongheop

doi:10.1016/j.cej.2012.01.121

Cited by 18 publications

(3 citation statements)

References 36 publications

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“…The increased degradation efficiency of TCE during co-feeding was likely due to hydroxyl radicals produced during the photodegradation of 2-propanol, because the hydroxyl radicals were considered the major active species in the photocatalytic oxidation of organic pollutants [29]. In contrast, other studies [30,31,32,33,34] reported that chlorinated olefins, TCE, perchloroethylene (PCE) and 1,1,3-trichloropropene (TCP), promoted the PDEs of aromatic VOCs. Specifically, Sauer et al .…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic Oxidation of Low-Level Airborne 2-Propanol and Trichloroethylene over Titania Irradiated with Bulb-Type Light-Emitting Diodes

2013

Materials

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This study examined the photocatalytic oxidation of gas-phase trichloroethylene (TCE) and 2-propanol, at indoor levels, over titanium dioxide (TiO2) irradiated with light-emitting diodes (LED) under different operational conditions. TiO2 powder baked at 450 °C exhibited the highest photocatalytic decomposition efficiency (PDE) for TCE, while all photocatalysts baked at different temperatures showed similar PDEs for 2-propanol. The average PDEs of TCE over a three hour period were four, four, five, and 51% for TiO2 powders baked at 150, 250, 350, and 450 °C, respectively. The average PDEs of 2-propanol were 95, 97, 98, and 96% for TiO2 powders baked at 150, 250, 350, and 450 °C, respectively. The ratio of anatase at 2θ = 25.2° to rutile at 2θ = 27.4° was lowest for the TiO2 powder baked at 450 °C. Although the LED-irradiated TiO2 system revealed lower PDEs of TCE and 2-propanol when compared to those of the eight watt, black-light lamp-irradiated TiO2 system, the results for the PDEs normalized to the energy consumption were reversed. Other operational parameters, such as relative humidity, input concentrations, flow rate, and feeding type were also found to influence the photocatalytic performance of the UV LED-irradiated TiO2 system when applied to the cleaning of TCE and 2-propanol at indoor air levels.

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Section: Resultsmentioning

confidence: 99%

Photocatalytic Oxidation of Low-Level Airborne 2-Propanol and Trichloroethylene over Titania Irradiated with Bulb-Type Light-Emitting Diodes

2013

Materials

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“…A wide range of chemical reactions have been performed on the microfluidic platform in a rapid manner with higher efficiency due to the large surface to volume ratio and shorter diffusion distance of the reactant solution in the microchannels. Photocatalysis using semiconductor materials is a promising alternative to the conventional treatment processes for a wide variety of organic contaminants in both air and water [6][7][8]. Recently, several researchers have made an effort to adopt these microfluidic chips as their choice of microreactor in order to enhance photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

An integrated photocatalytic microfluidic platform enabling total phosphorus digestion

Tong¹,

Tian²,

Bian³

et al. 2015

J. Micromech. Microeng.

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This paper presents an integrated thermally assisted photocatalytic microfluidic chip and its application to the digestion of total phosphorus (TP) in freshwater. A micro heater, a micro temperature sensor, thermal-isolation channels and a polymethylsiloxane (PDMS) reaction chamber were fabricated on the microfluidic chip. Nano-TiO 2 film sputtered on the surface of silicon in the reaction area was used as the photocatalyst, and a micro ultraviolet A-ray-lightemitting diode (UVA-LED) array fabricated by MEMS technology were attached to the top of reaction chamber for TP degradation. In this study, sodium tripolyphosphate (Na 5 P 3 O 10 ) and sodium glycerophosphate (C 3 H 7 Na 2 O 6 P) were chosen as the typical components of TP, and these water samples were digested under UVA light irradiation and heating at the same time. Compared with the conventional high-temperature TP digestion which works at 120 °C for 30 min, the thermally assisted UVA digestion method could work at relatively low temperature, and the power consumption is decreased to less than 2 W. Since this digestion method could work without an oxidizing reagent, it is compatible with the electrochemical detection process, which makes it possible to achieve a fully functional detection chip by integrating the digestion unit and electrochemical microelectrode, to realize the on-chip detection of TP, and other water quality parameters such as total nitrogen and chemical oxygen demand.

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“…But this type of reactors has a major drawback: the catalyst particles must be separated from the liquid phase which involves a time and energy consuming process. To avoid the filtration/separation and catalyst recovery steps, the active phase is anchored on a suitable support and used in fixed or fluidized bed reactors [10,11]. Different materials can 2 Advances in Materials Science and Engineering be used as catalytic carrier for TiO 2 in the photocatalytic degradation process.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Performance of Carbon Monolith/TiO₂Composite

Maletić

Vukčević

Kalijadis

et al. 2015

Advances in Materials Science and Engineering

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The new and simple approach for deposition of catalytically active TiO 2 coating on carbon monolith (CM) carrier was presented. CM photocatalysts were impregnated with TiO 2 using titanium solution and thermal treatment, and their photocatalytic activity was investigated in the process of methylene blue (MB) photodegradation. For the purpose of comparison, CM composite photocatalysts were prepared by dip-coating method, which implies binder usage. The presence of TiO 2 on CM carrier was confirmed by Raman spectroscopy and scanning electron microscopy. The sorption characteristics of CM and the role of adsorption in the overall process of MB removal were evaluated through amount of surface oxygen groups obtained by temperatureprogrammed desorption and specific surface area determined by BET method. CM has shown good adsorption properties toward MB due to high amount of surface oxygen groups and relatively high specific surface area. It was concluded that photocatalytic activity increases with CM disc thickness due to increase of MB adsorption and amount of deposited TiO 2 . Good photocatalytic activity achieved for samples obtained by thermal treatment is the result of better accessibility of MB solution to the TiO 2 particles induced by binder absence.

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Design of an efficient photocatalytic reactor for the decomposition of gaseous organic contaminants in air

Cited by 18 publications

References 36 publications

Photocatalytic Oxidation of Low-Level Airborne 2-Propanol and Trichloroethylene over Titania Irradiated with Bulb-Type Light-Emitting Diodes

Photocatalytic Oxidation of Low-Level Airborne 2-Propanol and Trichloroethylene over Titania Irradiated with Bulb-Type Light-Emitting Diodes

An integrated photocatalytic microfluidic platform enabling total phosphorus digestion

Photocatalytic Performance of Carbon Monolith/TiO₂Composite

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Design of an efficient photocatalytic reactor for the decomposition of gaseous organic contaminants in air

Cited by 18 publications

References 36 publications

Photocatalytic Oxidation of Low-Level Airborne 2-Propanol and Trichloroethylene over Titania Irradiated with Bulb-Type Light-Emitting Diodes

Photocatalytic Oxidation of Low-Level Airborne 2-Propanol and Trichloroethylene over Titania Irradiated with Bulb-Type Light-Emitting Diodes

An integrated photocatalytic microfluidic platform enabling total phosphorus digestion

Photocatalytic Performance of Carbon Monolith/TiO2Composite

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About

Photocatalytic Performance of Carbon Monolith/TiO₂Composite