Development of a slurry continuous flow reactor for photocatalytic treatment of industrial waste water

McCullagh, Cathy; Robertson, Peter K. J.; Adams, Morgan; Pollard, Pat; Mohammed, Abdulrahman

doi:10.1016/j.jphotochem.2010.01.020

Cited by 54 publications

(28 citation statements)

References 27 publications

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“…Here, reviewed photocatalytic reactors can be divided in to two categories, i.e., (i) lab-scale reactors [74,[101][102][103][104][105][106][107][108][109][110][111], where the volume of reactant solution is <1 L, and (ii) pilot plant-scale reactors [44,[112][113][114][115][116], where the reactor volume is >5 L. Recent innovations in lab-scale reactors include the use of energy-efficient UV/visible light emitting diodes (LEDs) as light sources [101][102][103][104][105], the design of rotating disc-type reactor models [74,106], the fabrication of NTO-immobilized catalytic beds [107,108], and post-separation/reuse of NTO powder catalysts [109][110][111]. LEDs are light sources that need less energy and, therefore, LED-based photocatalytic reactors are more energy-efficient systems.…”

Section: Photocatalytic Reactorsmentioning

confidence: 99%

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Photocatalytic Water Treatment by Titanium Dioxide: Recent Updates

Varghese²,

2012

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Photocatalytic water treatment using nanocrystalline titanium dioxide (NTO) is a well-known advanced oxidation process (AOP) for environmental remediation. With the in situ generation of electron-hole pairs upon irradiation with light, NTO can mineralize a wide range of organic compounds into harmless end products such as carbon dioxide, water, and inorganic ions. Photocatalytic degradation kinetics of pollutants by NTO is a topic of debate and the mostly reporting Langmuir-Hinshelwood kinetics must accompanied with proper experimental evidences. Different NTO morphologies or surface treatments on NTO can increase the photocatalytic efficiency in degradation reactions. Wisely designed photocatalytic reactors can decrease energy consumption or can avoid post-separation stages in photocatalytic water treatment processes. Doping NTO with metals or non-metals can reduce the band gap of the doped catalyst, enabling light absorption in the visible region. Coupling NTO photocatalysis with other water-treatment technologies can be more beneficial, especially in large-scale treatments. This review describes recent developments in the field of photocatalytic water treatment using NTO.

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Section: Photocatalytic Reactorsmentioning

confidence: 99%

“…The use of NTO pellets is another option to avoid post separation requirements in photocatalytic reactors. With a patented "drum reactor" design [111], McCullagh et al reported the degradation of methylene blue dye solution by Hombikat TiO 2 pellets. The reactor had three cylinders with paddles, which contained TiO 2 pellets.…”

Section: Photocatalytic Reactorsmentioning

confidence: 99%

Photocatalytic Water Treatment by Titanium Dioxide: Recent Updates

Varghese²,

2012

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“…From experience it was already known the issues relating to increasing catalyst loading, volume and energy required for agitation [32,33,[59][60][61]. Firstly a 200 mm tube reactor was created using a 250 ml measuring cylinder as the reactor vessel, secondly 260 mm tube reactor was created using a 350 ml hydrometer jar as a reactor vessel, due to the large size it was not possible to coat the inside of these vessels.…”

Section: Mini Midi and Maxi Multi Tubular Scale Upmentioning

confidence: 99%

Development of a doped titania immobilised thin film multi tubular photoreactor

Adams¹,

Skillen²,

McCullagh³

et al. 2013

Applied Catalysis B: Environmental

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CopyrightItems in 'OpenAIR@RGU', Robert Gordon University Open Access Institutional Repository, are protected by copyright and intellectual property law. If you believe that any material held in 'OpenAIR@RGU' infringes copyright, please contact openair-help@rgu.ac.uk with details. The item will be removed from the repository while the claim is investigated. "NOTICE: this is the author's version of a work that was accepted for publication in Applied Catalysis B: Environmental. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in APPLIED CATALYSIS B: ENVIRONMENTAL, [VOL 130, (2013) ABSTRACTThis paper describes a novel doped titania immobilised thin film tubular photoreactor which has been developed for use with liquid, vapour or gas phase media. The current approach to photocatalyst and photoreactor development is firmly based on the principles of surface area. This dictate greatly limits the applicability of any semi-conductor photocatalyst in industrial applications, as a large surface area equates to a powder catalyst. This work aims to show that the development of a thin film coating, doped with a rare earth element, and a novel photoreactor design produces a photocatalytic degradation of a model pollutant (Methyl Orange) equal to that of P25 TiO 2 . It will show that doped thin film tubes in a novel reactor configuration can produce a degradation rate of 95 % after 90 minutes under UV irradiation and 70 % under visible irradiation with no downstream processing required. The use of lanthanide doping is reported here in the titania sol gel as it is thought to increase the electron hole separation therefore widening the potential useful wavelengths within the electromagnetic spectrum. Increasing doping from 0.5 % to 1.0 % increased photocatalytic degradation by ~17 % under visible irradiation. A linear relationship has been seen between increasing reactor volume and degradation which would not normally be observed in a typical suspended reactor system.

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“…It can be seen that the COD value decreases very quickly during the time it takes to process through the three consecutive reaction drums (10-minutes reaction time). As these experiments were performed on different days and the Figure 13 Methylene blue degradation by pelletised TiO 2 (30 g Cat alone and 30 g Cat þ UV) and Degussa P25 (1 g/L Deg P25) reproduced from [26] with permission from Elsevier.…”

Section: Drum Reactor Designmentioning

confidence: 99%

From Ideal Reactor Concepts to Reality: The Novel Drum Reactor for Photocatalytic Wastewater Treatment

Adams

Campbell

McCullagh

et al. 2013

International Journal of Chemical Reactor Engineering

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This article reports the development of a novel drum photocatalytic reactor for treating dye effluent streams. The parameters for operation including drum rotation speed, light source distance, catalyst loading and H 2 O 2 doping have been investigated using methylene blue as a model pollutant. Effluent can be generated by a number of domestic and industrial sources, including pharmaceutical, oil and gas, agricultural, food and chemical sectors. The work reported here proposes the application of semiconductor photocatalysis as a final polishing step for the removal of hydrocarbons from effluents sources, initial studies have proved effective in removing residual hydrocarbons from the effluent.

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Development of a slurry continuous flow reactor for photocatalytic treatment of industrial waste water

Cited by 54 publications

References 27 publications

Photocatalytic Water Treatment by Titanium Dioxide: Recent Updates

Photocatalytic Water Treatment by Titanium Dioxide: Recent Updates

Development of a doped titania immobilised thin film multi tubular photoreactor

From Ideal Reactor Concepts to Reality: The Novel Drum Reactor for Photocatalytic Wastewater Treatment

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