Photocatalytic purification of volatile organic compounds in indoor air: A literature review

Mo, Jinhan; Zhang, Yinping; Xu, Qiujian; Lamson, Jennifer Joaquin; Ren, Zhao Hui

doi:10.1016/j.atmosenv.2009.01.034

Cited by 755 publications

(472 citation statements)

References 157 publications

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“…An acclimation period with lower removal efficiency (RE) of VOCs was necessary for microorganisms according our previous study [14]. For PCO, photocatalyst deactivation could result in the gradual decrease of its photocatalytic activity as observed in many researches [17,27,28]. Therefore, it is considered that single biological or PCO is not so perfect for organic waste gas treatment.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, biological and photocatalytic oxidation (PCO) have becoming attractive techniques for this purpose due to their low energy consumption, relatively moderate operating costs and minimal byproduct generation [11]. Moreover, these two techniques can decompose VOCs to nontoxic final products such as CO 2 and H 2 O at ambient temperatures [12][13][14][15][16][17]. Several researches have been found that a large number of VOCs, like benzene [18,19], toluene [20,21], xylene [1,22] and styrene [23,24] could be removed by single biological or PCO purification technology.…”

Section: Introductionmentioning

confidence: 99%

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Treatment of organic waste gas in a paint plant by combined technique of biotrickling filtration with photocatalytic oxidation

Zhao

Chen

et al. 2012

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Treatment of organic waste gas in a paint plant by combined technique of biotrickling filtration with photocatalytic oxidation

Zhao

Chen

et al. 2012

Chemical Engineering Journal

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“…Selective catalytic oxidation (SCO) is an effective method to degrade NH 3 , but the oxidation reaction generally requires a high temperature [5][6][7]. Photocatalytic oxidation (PCO) could eliminate the indoor air pollutants such as formaldehyde and volatile organic compounds under ultraviolet (UV) light irradiation at ambient temperature; therefore, it is a promising method for indoor air NH 3 destruction [8][9][10][11]. A few studies have been focused on the photocatalytic removal of gaseous NH 3 .…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic oxidation of gaseous ammonia over fluorinated TiO2 with exposed (001) facets

et al. 2014

Applied Catalysis B: Environmental

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a b s t r a c tA surface-fluorinated TiO 2 (F-TiO 2 ) catalyst was synthesized by a hydrothermal method using hydrofluoric acid (HF) solution as a capping agent, and defluorinated TiO 2 (D-TiO 2 ) was next obtained by washing the F-TiO 2 with NaOH solution. The as-prepared catalysts were tested for the photocatalytic oxidation (PCO) of gaseous NH 3 under UV light. The F-TiO 2 catalyst exhibited remarkable activity for NH 3 removal, about twice as high as that of the commercial catalyst P25. In contrast, D-TiO 2 showed an obvious decrease in PCO activity. The catalysts were characterized by X-ray diffractometry (XRD), Brunauer-Emmett-Teller (BET) adsorption analysis, High-resolution Transmission electron microscopy (HR-TEM), and X-ray photoelectron spectroscopy (XPS). The results showed that the surface fluorination process formed the surface Ti-F group and also increased the percentage of reactive (0 0 1) facets to about 50%; the surface defluorination removed the fluorine (F) element from the F-TiO 2 surface but showed no influence on the percentage of reactive (0 0 1) facets. By comparing the specific activities of the catalysts, we found that both the active (0 0 1) facets and the surface Ti-F group contributed to the improvement of the PCO activity, while the surface Ti-F group plays the dominant role. The Ti-F group could retard the recombination of photogenerated electrons and holes, which is possibly the major reason for the excellent activity of the F-TiO 2 catalyst.

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“…On the other hand, thermal methods act to break down contaminants but require significant energy input for heating: temperatures in the range of 200-250°C for processes incorporating catalysts [3] and a range of730-850°C for those processes not incorporating catalysts [4]; furthermore, there is the potential for harmful side-product formation (e.g., NO x and S02) from the thermal process which requires subsequent purification [5]. An emerging alternative method for air pollution control employs the use of semiconductors in photocatalytic oxidation (PCO) of organic contaminants to produce innocuous CO 2 and H 2 0 [1,6,7] . The primary advantages ofPCO over the aforementioned technologies are the use of non-expendable materials and low energy demand because the process operates at or near room temperature.…”

mentioning

confidence: 99%

The effect of photon source on heterogeneous photocatalytic oxidation of ethanol by a silica–titania composite

Coutts¹,

Levine²,

Richards³

et al. 2011

Journal of Photochemistry and Photobiology A: Chemistry

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Abstract:The objective of this study was to distinguish the effect of photon flux (i.e., photons per unit time reaching a surface) from that of photon energy (i.e., wavelength) of a photon source on the silica-titania composite (STC)-catalyzed degradation of ethanol in the gas phase.Experiments were conducted in a bench-scale annular reactor packed with STC pellets and irradiated with either a UV-A fluorescent black light blue lamp (Amax=365 nm) at its maximum light intensity or a UV-C germicidal lamp (Amax=254 nm) at three levels of light intensity. The STC-catalyzed oxidation of ethanol was found to follow zero-order kinetics with respect to CO 2 production, regardless of the photon source. Increased photon flux led to increased EtOH removal, mineralization, and oxidation rate accompanied by lower intermediate concentration in the effluent. The oxidation rate was higher in the reactor irradiated by UV-C than by UV-A (38.4 vs. 31.9 nM S-I) at the same photon flux, with similar trends for mineralization (53.9 vs.43.4%) and reaction quantum efficiency (i.e., photonic efficiency, 63.3 vs. 50.1 nmol CO 2 ~mol photons-I). UV-C irradiation also led to decreased intermediate concentration in the effluent . compared to UV -A irradiation. These results demonstrated that STC-catalyzed oxidation is enhanced by both increased photon flux and photon energy.

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Photocatalytic purification of volatile organic compounds in indoor air: A literature review

Cited by 755 publications

References 157 publications

Treatment of organic waste gas in a paint plant by combined technique of biotrickling filtration with photocatalytic oxidation

Treatment of organic waste gas in a paint plant by combined technique of biotrickling filtration with photocatalytic oxidation

Photocatalytic oxidation of gaseous ammonia over fluorinated TiO2 with exposed (001) facets

The effect of photon source on heterogeneous photocatalytic oxidation of ethanol by a silica–titania composite

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