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An experimental and modelling investigation of the effect of the flow regime on the photocatalytic degradation of methylene blue on a thin film coated ultraviolet irradiated spinning disc reactor

Paper ID Volume ID Publish Year Pages File Format Full-Text
46569 46442 2011 11 PDF Available
Title
An experimental and modelling investigation of the effect of the flow regime on the photocatalytic degradation of methylene blue on a thin film coated ultraviolet irradiated spinning disc reactor
Abstract

In this work, the impact of wave regime and operational parameters on the photocatalytic degradation of methylene blue was investigated on a thin film coated ultra-violet spinning disc. In the employed experimental setup, the wave regimes of spiral, unstructured and crisscross waves as well as smooth film could be observed at disc rotational speeds of 50–200 rpm and flow rates of 5–20 mL/s with a calculated average thickness of 160–450 μm. The glass discs were coated with anatase TiO2 by a sol–gel procedure followed by heat treatment at 500 ° C for 1 h. The reactor was irradiated by a low pressure mercury UV lamp producing an irradiance of 12–23 W/m2 on the disc surface. The reactant was saturated with oxygen and the effect of spinning speed, flow rate and the resulting wave regime on the degradation rate and kinetics of methylene blue and its reaction intermediates determined. Reactions followed pseudo-second-order kinetics, suggesting dimerisation and/or mass transfer limitations given that the two reactions with the highest conversion observed at 15 mL/s and 100 and 200 rpm, were pseudo-first-order. The spinning disc reactor was, however, not photon transfer limited. The wave regimes showed no impact on the reaction rate, since the flow was mainly laminar with no interfacial mass transfer of oxidant required.

Graphical AbstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Degradation of methylene blue in a thin film photocatalytic spinning disc reactor. ► Liquid fed onto centre of horizontally spinning disc spreading out into a thin film. ► Wave regime showed no effect on degradation rate due to laminar dominated flow. ► Photonic efficiency is independent of liquid film height. ► Two reaction rate maxima observed at 15 mL/s and 100 and 200 rpm.

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An experimental and modelling investigation of the effect of the flow regime on the photocatalytic degradation of methylene blue on a thin film coated ultraviolet irradiated spinning disc reactor
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 110, 2 November 2011, Pages 14–24
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us