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Issue 28, 2014
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The nature of chlorine-inhibition of photocatalytic degradation of dichloroacetic acid in a TiO2-based microreactor

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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.

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

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Publication details

The article was received on 11 Mar 2014, accepted on 29 Apr 2014 and first published on 30 Apr 2014


Article type: Paper
DOI: 10.1039/C4CP01043D
Phys. Chem. Chem. Phys., 2014,16, 14867-14873
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    The nature of chlorine-inhibition of photocatalytic degradation of dichloroacetic acid in a TiO2-based microreactor

    M. Krivec, R. Dillert, D. W. Bahnemann, A. Mehle, J. Štrancar and G. Dražić, Phys. Chem. Chem. Phys., 2014, 16, 14867
    DOI: 10.1039/C4CP01043D

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