The application of oscillatory flow mixing to photocatalytic wet oxidation

Fabiyi, Malcolm; Skelton, Robert L.

doi:10.1016/s1010-6030(99)00177-x

Cited by 30 publications

(13 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These results indicate that the OBC is able to produce improved plug flow conditions relative to a standard flotation column, particularly at low frequencies and amplitudes. This suggests that the OBC is an inherently more efficient 'reactor-type', and is consistent with the OBC's application in many chemical reaction applications (Fabiyi & Skelton, 1999, Stonestreet & Harvey, 2002, Skelton et. al., 2005.…”

Section: The Effect Of Power Dissipation On Mixing Characteristicssupporting

confidence: 72%

See 1 more Smart Citation

Flotation in a novel oscillatory baffled column

Anderson

Harris

Deglon

2009

Minerals Engineering

View full text Add to dashboard Cite

Section: The Effect Of Power Dissipation On Mixing Characteristicssupporting

confidence: 72%

“…al., 1999), protein refolding (Lee et. al., 2002), photocatalytic oxidation (Fabiyi & Skelton, 1999, Gao et. al., 2003 and droplet breakage (Mignard et.…”

Section: Introductionmentioning

confidence: 99%

Flotation in a novel oscillatory baffled column

Anderson

Harris

Deglon

2009

Minerals Engineering

View full text Add to dashboard Cite

“…Several designs are meant to enhance the mixing of the suspension so that all of Ž the catalyst can be illuminated for example, by using a rotat-. Ž ing glass tube Karpel Vel Leitner et al, 1996;Sczechowski et al, 1995;Fabiyi and Skelton, 1999;Lea and Adesina, 1999;. Sobczynski et al, 1997 . In reactors with an immobilized catalyst, the utilization of light is improved by optical fibers coated with titanium diox-Ž ide that transmit the light Marigangeli and Ollis, 1980; Hof-.…”

mentioning

confidence: 99%

Performance of immobilized photocatalytic reactors in continuous mode

et al. 2003

View full text Add to dashboard Cite

) A packed-bed PBR , fiber FR , membrane MR , and tubular TR photocatalytic reactor ha®e been modeled to compare their performance on a pilot scale. The influence of radial dispersion in the PBR and mass-transfer limitation in the PBR, FR, and TR has been taken into account. The oxygen concentration in the liquid has a large influence on the performance and, therefore, air or pure oxygen should be added. The MR and PBR ha®e a better performance than the TR and FR. Only a small degree of mass-transfer limitation occurs in the PBR. Radial dispersion hardly influences the performance of the PBR. External mass-transfer limitation influences the con®ersion in the TR and FR se®erely. The PBR, MR, and TR show a much better energy efficiency than the FR. Introduction Ž. Like other advanced oxidation technologies AOTs , heterogeneous photocatalysis is an emerging technology for water purification. Almost any organic pollutant present in water can totally be degraded to carbon dioxide, water, and mineral acids. Heterogeneous photocatalysis for water purification is based on a semiconductor, usually TiO , and UV-A 2 Ž . radiation -385 nm . The light activates the semiconductor by generating electron᎐hole pairs. These charge carriers can participate in redox reactions at the surface and form hy-Ž droxyl radicals, which can degrade the pollutant Halmann, 1996;Hoffmann et al., 1995;Mills et al., 1997;Bahnemann, . 1999;Serpone and Pellizetti, 1989;Schiavello, 1997 . In the field of heterogeneous photocatalysis, much research has been performed on the laboratory scale, but no industrial application exists to our knowledge. One of the reasons that prevented this technology from being established in industrial installations is the absence of efficient re-Ž actors, proper reactor design, and reactor optimization Ollis et al., 1991;Legrini et al., 1993; Rajeshwar, 1995;Maurino et . al., 1999 . Reactors presented in the literature can be divided into two categories: reactors using solar light, and those using artificial light. The solar reactors will not be discussed, since our project focuses on reactors using artificial light. A sumCorrespondence concerning this article should be addressed to. M. F. J. Dijkstra. mary of the most important reactor designs in the artificiallight reactor category is given in Table 1. Ž Slurry reactors have often been investigated Cassano et . al., 1995 : in the laboratory, an immersed annular reactor is the type most used. A promising design is that using a thin flowing film of a titanium dioxide suspension over an illumi-Ž nated glass plate or annulus Ollis and Turchi, 1990;Yue, . 1997 . The cocurrent downflow contactor reactor has two sections. In the top part, the pollutants adsorb onto the catalyst; in the lower part the slurry is irradiated to degrade the Ž . pollutants Winterbottom et al., 1997 . Several designs are meant to enhance the mixing of the suspension so that all of Ž the catalyst can be illuminated for example, by using a rotat-. Ž ing glass tube Karpel Vel Leitner et al., 1996;Sczec...

show abstract

“…More rarely, less classical systems are adopted (Rotating Drum Reactor [220], Intermittent Flow Reactor [219], Fiber Optic Cable Reactor [221,222], Photocatalytic Membrane Reactor [223], Falling Film Photoreactor [224], Pulsed Baffled Tube Photoreactor [225], etc.). Figure 6.8 from Danion et al [226] shows a reactor using TiO 2 deposited by sol-gel method on optical fibers.…”

Section: Photocatalytic Reactorsmentioning

confidence: 99%

Titanium Dioxide in Photocatalysis

Cassaignon

Colbeau‐Justin

Durupthy

2012

Nanomaterials: A Danger or a Promise?

View full text Add to dashboard Cite

TiO 2 -based heterogeneous photocatalysis is a process that develops rapidly in environmental engineering and it is now employed in several industrial domains, including water treatment, air purification, and self-cleaning surfaces. Photocatalysis is a natural phenomenon in which the TiO 2 accelerates a chemical reaction through the action of light, without being altered. The illuminated TiO 2 induces the formation of reactive species, able to decompose by oxidation and/or reduction reactions organic or inorganic substances. The major part of the applications of photocatalysis corresponds to organic oxidation, and it is now considered as one of the Advanced Oxidation Technologies (AOTs), gathering the reactions mainly based on hydroxyl radical (HO • ) chemistry. The development of a system based on photocatalysis requires gathering knowledge of numerous and various scientific domains: physical-chemistry, materials science, catalysis, environmental chemistry, biology, and engineering science. This chapter is therefore designed to give a detailed survey of the different scientific fields concerning TiO

show abstract

The application of oscillatory flow mixing to photocatalytic wet oxidation

Cited by 30 publications

References 15 publications

Flotation in a novel oscillatory baffled column

Flotation in a novel oscillatory baffled column

Performance of immobilized photocatalytic reactors in continuous mode

Titanium Dioxide in Photocatalysis

Contact Info

Product

Resources

About