The nature of chlorine-inhibition of photocatalytic degradation of dichloroacetic acid in a TiO2-based microreactor

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Krivec, M.; Dillert, R.; Bahnemann, D. W.; Mehle, A.; Strancar, J.; Drazic, G.: The nature of chlorine-inhibition of photocatalytic degradation of dichloroacetic acid in a TiO2-based microreactor. In: Physical Chemistry Chemical Physics 16 (2014), Nr. 28, S. 14867-14873. DOI: http://dx.doi.org/10.1039/c4cp01043d

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Sum total of downloads: 152




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Abstract: 
Photocatalytic degradation of dichloroacetic acid (DCA) was studied in a continuous-flow set-up using a titanium microreactor with an immobilized double-layered TiO2 nanoparticle/nanotube film. Chloride ions, formed during the degradation process, negatively affect the photocatalytic efficiency and at a certain concentration (approximately 0.5 mM) completely stop the reaction in the microreactor. Two proposed mechanisms of inhibition with chloride ions, competitive adsorption and photogenerated-hole scavenging, have been proposed and investigated by adsorption isotherms and electron paramagnetic resonance (EPR) measurements. The results show that chloride ions block the DCA adsorption sites on the titania surface and reduce the amount of adsorbed DCA molecules. The scavenging effect of chloride ions during photocatalysis through the formation of chlorine radicals was not detected.
License of this version: CC BY-NC 3.0
Document Type: article
Publishing status: publishedVersion
Issue Date: 2014
Appears in Collections:Naturwissenschaftliche Fakultät

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pos. country downloads
total perc.
1 image of flag of Germany Germany 126 82.89%
2 image of flag of China China 7 4.61%
3 image of flag of Poland Poland 4 2.63%
4 image of flag of United States United States 2 1.32%
5 image of flag of Dominican Republic Dominican Republic 2 1.32%
6 image of flag of Taiwan Taiwan 1 0.66%
7 image of flag of Slovenia Slovenia 1 0.66%
8 image of flag of Saudi Arabia Saudi Arabia 1 0.66%
9 image of flag of Japan Japan 1 0.66%
10 image of flag of Argentina Argentina 1 0.66%
    other countries 6 3.95%

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