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ChemEngineering 2018, 2(1), 4; https://doi.org/10.3390/chemengineering2010004

Effect of Noble Metals (Ag, Pd, Pt) Loading over the Efficiency of TiO2 during Photocatalytic Ozonation on the Toxicity of Parabens

1
CIEPQPF—Chemical Engineering Processes and Forest Products Research Center, Department of Chemical Engineering, Faculty of Sciences and Technology, University of Coimbra, Rua Sílvio Lima, 3030-790 Coimbra, Portugal
2
Faculty of Process and Environmental Engineering, Department of Safety Engineering Lodz University of Technology, Wolczanska 213, 90-924 Lodz, Poland
3
Faculty of Process and Environmental Engineering, Department of Bioprocess Engineering Lodz University of Technology, Wolczanska 213, 90-924 Lodz, Poland
4
Faculty of Chemistry, Department of Environmental Technology, University of Gdansk, ul. Wita Stwosza 63, 80-308 Gdańsk, Poland
5
CNC—Center for Neuroscience and Cell Biology and Department of Physics, Faculty of Sciences and Technology, University of Coimbra, Rua Larga, P-3004-516 Coimbra, Portugal
This article belongs to the Special Issue Selected Papers from ICEER 2017: 2017 the 4th International Conference on Energy and Environment Research.
*
Author to whom correspondence should be addressed.
Received: 6 December 2017 / Revised: 14 December 2017 / Accepted: 3 January 2018 / Published: 9 January 2018
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Abstract

The conventional wastewater treatments are inadequate for emerging contaminants detoxification. Photocatalytic ozonation with suitable catalyst can be considered as a suitable solution on the removal of these compounds. The aim of this study was to verify the effect of Ag, Pd and Pt with different loadings (0.1, 0.5 and 1% wt %) onto TiO2 surface for the degradation of a mixture of parabens (methyl, ethyl, propyl, butyl and benzyl) through photocatalytic ozonation. Chemical oxygen demand (COD) and total organic carbon (TOC) was also analyzed after treatments, as well as the effect of the treatment on the samples toxicity over different species, including bacteria, clams and plants. The effect of metal loading on the parabens degradation; COD and TOC removal is very dependent upon the type of noble metal used. This can be related with the different pathways influenced by the metal load. On the one hand, it can be related with the reduction of electron–hole recombination phenomenon, and, on the other hand, the trapping of electrons by the metals reduces the amount of ozonide and hydroxyl radicals produced. In terms of toxicity, apparently the best results were achieved with the intermediate noble metal load. However, the effect of noble metal load must be analyzed case to case. View Full-Text
Keywords: metal loading; photocatalytic ozonation; emerging contaminants; toxicity reduction metal loading; photocatalytic ozonation; emerging contaminants; toxicity reduction
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Gomes, J.F.; Lopes, A.; Bednarczyk, K.; Gmurek, M.; Stelmachowski, M.; Zaleska-Medynska, A.; Quinta-Ferreira, M.E.; Costa, R.; Quinta-Ferreira, R.M.; Martins, R.C. Effect of Noble Metals (Ag, Pd, Pt) Loading over the Efficiency of TiO2 during Photocatalytic Ozonation on the Toxicity of Parabens. ChemEngineering 2018, 2, 4.

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