Photocatalytic air purification: Comparative efficacy and pressure drop of a TiO2-coated thin mesh and a honeycomb monolith at high air velocities using a 0.4m3 close-loop reactor

Taranto, Jérôme; Frochot, Didier; Pichat, Pierre

doi:10.1016/j.seppur.2009.03.017

Cited by 61 publications

(29 citation statements)

References 21 publications

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“…Because of these advantages, there have been some recent focuses on the coated mesh photocatalytic gas phase reactor. Taranto et al (2009) compared honeycomb monolith and mesh reactors regarding pollutant degradation and pressure drop; Chang et al (2010) studied a coated stainless steel sieve for elimination of acetone; Ochiai et al (2011) addressed a modified titanium mesh filter for odour control in batch and continuous mode. The radiative interchange modelling and experimental validation of a multiple mesh photocatalytic reactor for air remediation has been previously addressed (Esterkin et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Coated mesh photocatalytic reactor for air treatment applications: comparative study of support materials

Passalía

Nocetti

Alfano

et al. 2016

Environ Sci Pollut Res

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An experimental comparative study of different meshes as support materials for photocatalytic applications in gas phase is presented. The photocatalytic oxidation of dichloromethane in air was addressed employing different coated meshes in a laboratory-scale, continuous reactor. Two fiberglass meshes and a stainless steel mesh were studied regarding the catalyst load, adherence, and catalytic activity. Titanium dioxide photocatalyst was immobilized on the meshes by dip-coating cycles. Results indicate the feasibility of the dichloromethane elimination in the three cases. When the number of coating cycles was doubled, the achieved conversion levels were increased twofold for stainless steel and threefold for the fiberglass meshes. One of the fiberglass meshes (FG2) showed the highest reactivity per mass of catalyst and per catalytic surface area.

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Section: Introductionmentioning

confidence: 99%

Coated mesh photocatalytic reactor for air treatment applications: comparative study of support materials

Passalía

Nocetti

Alfano

et al. 2016

Environ Sci Pollut Res

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“…The first solar photocatalysis industrial pilot-plant was installed in 1999 in Arganda del Rey (Madrid, Spain) for the treatment of non-biodegradable chlorinated hydrocarbon solvents [8]. However, water treatment by photocatalysis seems to be not competitive with other technologies -such as biological treatment or photo-Fenton [11,12] -and recent efforts in applied research of this technology are increasingly focused on the treatment of air [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…Monolithic structures are preferred, because they have a high surface area per unit volume and, in turn, low pressure drop, which has made them popular in thermal catalysis applications as well [26]. However, monoliths are often based on metals [15,27], ceramics [28] or activated carbon [29] and therefore opaque. The penetration of light inside the monolith channels is very short [30], which requires for photocatalysis applications modular configurations consisting of shallow monoliths irradiated by groups of lamps located between them [31] or internally illuminated by optical fibers [32].…”

Section: Introductionmentioning

confidence: 99%

Solar/lamp-irradiated tubular photoreactor for air treatment with transparent supported photocatalysts

Portela¹,

Suárez²,

Tessinari

et al. 2011

Applied Catalysis B: Environmental

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a b s t r a c tA novel versatile tubular reactor that may use both types of radiation, solar and/or artificial, and different types of suspended or immobilized photocatalysts is proposed. The photocatalytic reactor was evaluated for air treatment at laboratory scale and semi-pilot-plant scale. UV-A transparent immobilized photocatalysts were employed, which allowed an efficient use of radiation. Two different types of photocatalytic modules were tested: (a) TiO 2 -coated PET monoliths and (b) TiO 2 -coated glass slides, arranged in monolith-like units with the help of especially designed star-shaped polygonal structures. Both types of units were easy to handle and assured the adequate distribution of the photocatalyst inside the tubular reactor. The efficiency of the photocatalytic system with both solar and artificial radiation to oxidize the H 2 S contained in an air stream was demonstrated at the laboratory roof and in the treatment of real air of a wastewater treatment plant located in Madrid (Spain). As a consequence of the chemical nature of the pollutant, the photocatalytic activity decayed over time due to the accumulation of sulfate on the surface, but easy regeneration of the exhausted photocatalyst was achieved by washing with water.

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“…TiO 2 is an environmental catalyst widely used in the photocatalyst area for water and air purification, [7][8][9][10] solar cells elaboration, 11) and so on. When TiO 2 exists in anatase phase, it is known to have greater ability as a photocatalyst than rutile phase.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, some researchers have attempted to coat TiO 2 particles on supports by impregnating them into the suspension prepared by the commercial product, Degussa P-25. 8,14,15) However, in case of foam supports with the pore size of tens of mm, the above methods are not likely suitable due to the aggregation of TiO 2 particles on the exterior surface which would lead to non-uniform coating layer and pore blocking. Hence, the research regarding methodological development to form regular TiO 2 coating layer by minimizing pore blocking caused by particle aggregation is needed.…”

Section: Introductionmentioning

confidence: 99%

TiO<SUB>2</SUB>-Coated Silica Foams by <I>In-Situ</I> Sol-Gel Reaction

Han

Kim

2011

Mater. Trans.

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In-situ sol-gel method was used to prepare TiO 2 -coated silica foams by minimizing window (i.e., the part formed by the interconnection of pores) blocking caused from the aggregation of TiO 2 particles during the coating process. Specifically, the coating process employed was achieved by performing sol-gel reaction directly onto the surface of silica foams after penetrating precursor solution through the foams. EDX results showed that TiO 2 particles were evenly distributed onto the surface of inner pores in silica foams, indicating that the coating process employed is likely effective for the surface modification of silica foams with 3-dimensional pore network. Additional characterization tests were carried out to evaluate physical properties (pore structure, crystalline structure, specific surface area, permeability, and mechanical strength) of TiO 2 -coated silica foams according to heat treatment temperature (300-1100 C). The anatase phase started to appear at heat treatment temperature of 500 C and had maximum value at 700 C. TiO 2 particles tended to grow with increasing treatment temperature, leading to the change in relevant physical properties (i.e., the decrease in total and open porosity, specific surface area, and gas permeability, and the increase in closed porosity) due to the clogging of micropores (d p 2 mm); however, the mechanical strength was enhanced after TiO 2 coating with no significant change with heat treatment temperature.

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Photocatalytic air purification: Comparative efficacy and pressure drop of a TiO2-coated thin mesh and a honeycomb monolith at high air velocities using a 0.4m3 close-loop reactor

Cited by 61 publications

References 21 publications

Coated mesh photocatalytic reactor for air treatment applications: comparative study of support materials

Coated mesh photocatalytic reactor for air treatment applications: comparative study of support materials

Solar/lamp-irradiated tubular photoreactor for air treatment with transparent supported photocatalysts

TiO<SUB>2</SUB>-Coated Silica Foams by <I>In-Situ</I> Sol-Gel Reaction

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