A rapid treatment of formaldehyde in a highly tight room using a photocatalytic reactor combined with a continuous adsorption and desorption apparatus

Shiraishi, Fumihidé; Yamaguchi, Shunsuke; Ohbuchi, Yusuke

doi:10.1016/s0009-2509(02)00630-9

Cited by 83 publications

(56 citation statements)

References 7 publications

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“…Ao and Lee [144] studied toluene vapour and nitrogen oxide removal using TiO 2 immobilized on an activated carbon filter. Shiraishi et al [145], by combining photocatalysis with adsorption and thermal regeneration, developed a novel air-purification system consisting of a rotating honeycomb loaded with zeolite or activated carbon, combined with a photoreactor able to eventually oxidize the desorbed volatile contaminants. Chin et al [146] developed a kinetic model for a rotating adsorbent-photocatalyst reactor able to remove formaldehyde in air.…”

Section: Physical Adsorptionmentioning

confidence: 99%

The combination of heterogeneous photocatalysis with chemical and physical operations: A tool for improving the photoprocess performance

Augugliaro

Litter

Palmisano

et al. 2006

Journal of Photochemistry and Photobiology C: Photochemistry Re

427

180

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Heterogeneous photocatalysis is a process of great potential for pollutant abatement and waste treatment. In order to improve the overall performance of the photoprocess, heterogeneous photocatalysis is being combined with physical or chemical operations, which affect the chemical kinetics and/or the overall efficiency. This review addresses the various possibilities to couple heterogeneous photocatalysis with other technologies to photodegrade organic and inorganic pollutants dissolved in actual or synthetic aqueous effluents. These combinations increase the photoprocess efficiency by decreasing the reaction time in respect to the separated operations or they decrease the cost in respect of heterogeneous photocatalysis alone, generally in terms of light energy. Depending on the operation coupled with heterogeneous photocatalysis, two categories of combinations exist. When the coupling is with ultrasonic irradiation, photo-Fenton reaction, ozonation, or electrochemical treatment, the combination affects the photocatalytic mechanisms thus improving the efficiency of the photocatalytic process. When the coupling is with biological treatment, membrane reactor, membrane photoreactor, or physical adsorption, the combination does not affect the photocatalytic mechanisms but it improves the efficiency of the overall process. The choice of the coupling is related to the type of wastewater to be treated. A synergistic effect, giving rise to an improvement of the efficiency of the photocatalytic process, has been reported in the literature for many cases.

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Section: Physical Adsorptionmentioning

confidence: 99%

The combination of heterogeneous photocatalysis with chemical and physical operations: A tool for improving the photoprocess performance

Augugliaro

Litter

Palmisano

et al. 2006

Journal of Photochemistry and Photobiology C: Photochemistry Re

427

180

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“…Here a ''honeycomb rotor'' was loaded with zeolite particles and used as a sorption apparatus initially for formaldehyde. In this case, preference was still given to loading with activated carbon and thermal desorption [27]. Later the same set-up was tested with further volatile compounds using zeolites as a first step and photocatalytical decomposition as a second step [28].…”

Section: Introductionmentioning

confidence: 99%

Catalyzed Reactions on Mineral Plaster Materials Used for Indoor Air Purification

Gunschera¹,

Markewitz²,

Koberski³

et al. 2013

CLEAN Soil Air Water

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Zeolites have been used for a long time for purification and catalytical purposes. Recently, first products appeared on the market using zeolites also for improving the indoor air quality so far volatile organic compounds (VOC) are concerned. However, porous compounds like zeolites can be found also in plaster material. Therefore, it was manifest to evaluate the capability of plaster with regard to air cleaning. In this article, the contribution of plaster compounds toward adsorption and catalytical decomposition of VOCs is evaluated using a-pinene, chlorobenzene, 2-ethoxyethylacetate, and pentanal as target substances under standard conditions (238C, 50% r.H.). These compounds were chosen because of their VOC typical physicochemical properties like molecular dimensions, density, boiling point, vapor pressure, and octanol-water distribution coefficient (logk ow ). Hydrated lime and metakaolin were found out to have good adsorption properties under these circumstances. Also natural zeolites showed good results especially on pentanal. By investigations in environmental chambers the reduction potential of test plasters on chlorobenzene and 2-ethoxyethylacetate concentrations could be shown. Application of coatings had no or only temporary influence on the performance of the plaster. Additional tests in small chambers demonstrated the possibility to improve the properties of plasters with help of FAU-or MFI-type zeolites but the experiments also showed that a-pinene and pentanal undergo chemical reactions. Further effort should be made on investigations also toward other compounds, especially more volatile ones like formaldehyde. Also additional building materials like insulation material or boards should be taken into account.

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“…Among them, heterogeneous photocatalysis appears to be an emerging destructive technology leading to the total mineralization of most organic pollutants. [2][3][4][5][6] TiO 2 is the most widely used photocatalyst because of its good activity, chemical stability, commercial availability, and inexpensiveness. Anatase has higher photocatalytic activity and has been studied more than the other two forms of TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Characterization of Co-AC/TiO2 Composites and Their Photonic Decomposition for Organic Dyes

Chen¹,

Son²,

Park³

et al. 2010

Korean. J. Mater. Res.

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In this study, activated carbon (AC) as a carbon source was modified with different concentrations of cobalt chloride (CoCl 2 ) to prepare a Co-AC composite, and it was used for the preparation of Co-AC/TiO 2 composites with titanium oxysulfate (TOS) as the titanium precursor. The physicochemical properties of the prepared Co-AC/TiO 2 composites were characterized by N 2 adsorption at 77 K, X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray (EDX) analysis. The photocatalytic treatments of organic dyes were examined under an irradiation of visible light with different irradiation times. N 2 adsorption data showed that the composites had decreased surface area compared with the pristine AC, which was 389 m 2 /g. From the XRD results, the Co-AC/TiO 2 composites contained a mixturephase structuresof anatase and rutile, but a cobalt oxide phase was not detected in the XRD pattern. The EDX results of the Co-AC/TiO 2 composites confirmed the presence of various elements, namely, C, O, Ti, and Co. Subsequently, the decomposition of methylene orange (MO, C 14 H 14 N 3 NaO 3 S) and rhodamine B (Rh.B, C 28 H 31 ClN 2 O 3 ) in an aqueous solution, respectively, showed the combined effects of an adsorption effect by AC and the photo degradation effect by TiO 2 . Especially, the Co particles in the Co-AC/TiO 2 composites could enhance the photo degradation behaviors of TiO 2 under visible light.

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A rapid treatment of formaldehyde in a highly tight room using a photocatalytic reactor combined with a continuous adsorption and desorption apparatus

Cited by 83 publications

References 7 publications

The combination of heterogeneous photocatalysis with chemical and physical operations: A tool for improving the photoprocess performance

The combination of heterogeneous photocatalysis with chemical and physical operations: A tool for improving the photoprocess performance

Catalyzed Reactions on Mineral Plaster Materials Used for Indoor Air Purification

Characterization of Co-AC/TiO2 Composites and Their Photonic Decomposition for Organic Dyes

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