What is it about?
Studies were carried out in atmospheric or low-pressure batch type microwave photocatalytic reactors. The photocatalytic process was monitored by the change in concentration of Cl− in the solution. Coupled UV/MW irradiation led to effective photodegradation at higher MCAA concentration at an optimum value of 0.15 mol L−1. Photocatalytic reaction of MCAA was favoured at higher temperature mainly owing to thermal dependence of the Hg-EDL light intensity on the 366 nm line. Inhibition of MCAA photodegradation was observed in the presence of CO32− and SO42− anions, whereas the effect of NO3− was negligible.
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Why is it important?
Mercury electrodeless discharge lamps (Hg-EDLs) coated with titania in the form of thin films were used to generate UV/Vis radiation when placed in a microwave field. Effects of additional operational parameters (i.e. initial MCAA concentration, reaction temperature, and the presence of inorganic anions) on the photocatalytic degradation of aqueous mono-chloroacetic acid (MCAA) in a microwave field are discussed.
Perspectives
It was found that additional operational parameters had important effects on photocatalytic efficiency in a microwave field. The MCAA photodegradation process with titania-coated Hg-EDLs can be enhanced in the TiO2/UV/MW system.
Dr Vladimír Církva
Institute of Chemical Process Fundamentals
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This page is a summary of: Microwave photocatalysis IV: Effects of additional operational parameters on the microwave photocatalytic degradation of mono‐chloroacetic acid using titania‐coated mercury electrodeless discharge lamps, Journal of Chemical Technology & Biotechnology, October 2012, Wiley,
DOI: 10.1002/jctb.3947.
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