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Materials 2015, 8(1), 231-250; doi:10.3390/ma8010231

TiO2-Mediated Photocatalytic Mineralization of a Non-Ionic Detergent: Comparison and Combination with Other Advanced Oxidation Procedures

1
Department of General and Inorganic Chemistry, Institute of Chemistry, University of Pannonia, P.O.Box 158, 8201 Veszprém, Hungary
2
Department of Analytical Chemistry, Institute of Chemistry, University of Pannonia, P.O.Box 158, 8201 Veszprém, Hungary
*
Author to whom correspondence should be addressed.
Academic Editor: Klára Hernádi
Received: 7 November 2014 / Accepted: 6 January 2015 / Published: 14 January 2015
(This article belongs to the Special Issue Photocatalytic Materials)
View Full-Text   |   Download PDF [768 KB, uploaded 14 January 2015]   |  

Abstract

Triton X-100 is one of the most widely-applied man-made non-ionic surfactants. This detergent can hardly be degraded by biological treatment. Hence, a more efficient degradation method is indispensable for the total mineralization of this pollutant. Application of heterogeneous photocatalysis based on a TiO2 suspension is a possible solution. Its efficiency may be improved by the addition of various reagents. We have thoroughly examined the photocatalytic degradation of Triton X-100 under various circumstances. For comparison, the efficiencies of ozonation and treatment with peroxydisulfate were also determined under the same conditions. Besides, the combination of these advanced oxidation procedures (AOPs) were also studied. The mineralization of this surfactant was monitored by following the TOC and pH values, as well as the absorption and emission spectra of the reaction mixture. An ultra-high-performance liquid chromatography (UHPLC) method was developed and optimized for monitoring the degradation of Triton X-100. Intermediates were also detected by GC-MS analysis and followed during the photocatalysis, contributing to the elucidation of the degradation mechanism. This non-ionic surfactant could be efficiently degraded by TiO2-mediated heterogeneous photocatalysis. However, surprisingly, its combination with the AOPs applied in this study did not enhance the rate of the mineralization. Moreover, the presence of persulfate hindered the photocatalytic degradation. View Full-Text
Keywords: nonionic surfactant; advanced oxidation process; titanium dioxide; photocatalytic degradation; UHPLC; ozonation; persulfate nonionic surfactant; advanced oxidation process; titanium dioxide; photocatalytic degradation; UHPLC; ozonation; persulfate
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Hegedűs, P.; Szabó-Bárdos, E.; Horváth, O.; Horváth, K.; Hajós, P. TiO2-Mediated Photocatalytic Mineralization of a Non-Ionic Detergent: Comparison and Combination with Other Advanced Oxidation Procedures. Materials 2015, 8, 231-250.

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