Photocatalytic ozonation using doped TiO2 catalysts for the removal of parabens in water

João F. Gomes , Inês Leal , Katarzyna Bednarczyk , Marta Gmurek , Marek Stelmachowski , Magdalena Diak , M. Emília Quinta-Ferreira , Raquel Costa , Rosa M. Quinta-Ferreira , Rui C. Martins


Conventional wastewater treatments are inefficient for the removal of parabens. The aim of this study was finding a suitable solution using ozone and UVA irradiation combined with TiO2 catalysts doped with different noble metals (Ag, Pt, Pd, Au). Photocatalytic ozonation required lower amounts of ozone for higher efficiency on the removal of parabens, chemical oxygen demand (COD) and total organic carbon (TOC). The best catalyst for the initial contaminants degradation was 0.5% Ag-TiO2 leading to total parabens removal using 46 mgO3/L. Due to the relative low mineralization achieved, the toxicity of the treated solutions was still compared with the initial one over several species (Vibrio fischeri, Lepidium sativum and Corbicula fluminea). All the treatments applied led to a clear decrease on the toxicity compared with initial mixture of parabens. From an economical point of view, it was concluded that the presence of UVA irradiation increased the energy consumption compared with catalytic ozonation with these catalysts but it can decrease the time of reaction. From the by-products analysis, it was concluded that hydroxylation appears to be the most significant reaction pathway and the main responsible for parabens degradation.
Author João F. Gomes
João F. Gomes,,
, Inês Leal
Inês Leal,,
, Katarzyna Bednarczyk
Katarzyna Bednarczyk,,
, Marta Gmurek
Marta Gmurek,,
, Marek Stelmachowski
Marek Stelmachowski,,
, Magdalena Diak PFotokatalizy
Magdalena Diak,,
- Laboratory of Photocatalysis
, M. Emília Quinta-Ferreira
M. Emília Quinta-Ferreira,,
, Raquel Costa
Raquel Costa,,
, Rosa M. Quinta-Ferreira
Rosa M. Quinta-Ferreira,,
, Rui C. Martins
Rui C. Martins,,
Other language title versions
Journal seriesScience of the Total Environment, ISSN 0048-9697
Issue year2017
Publication size in sheets0.55
Keywords in Englishphotocatalytic ozonation, parabens degradation, doped TiO2, toxicity, cost evaluation, by-products analysis
Languageen angielski
Score (nominal)40
ScoreMinisterial score = 40.0, 20-12-2017, ArticleFromJournal
Ministerial score (2013-2016) = 40.0, 20-12-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 4.9 (2) - 2016=5.102 (5)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.