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Stoichiometric excesses of H 2 O 2 as dosimetry strategy: proof of concept for UVC-H 2 O 2 , dark-Fenton, and UVC-Fenton

Cunha-Filho, Fernando José Vieira ; do Nascimento Silva, Douglas ; do Nascimento, Claudio Augusto Oller ; Chiavone-Filho, Osvaldo ; Mota-Lima, Andressa

Environmental science and pollution research international, 2023-02, Vol.30 (6), p.14860 [Periódico revisado por pares]

Germany

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  • Título:
    Stoichiometric excesses of H 2 O 2 as dosimetry strategy: proof of concept for UVC-H 2 O 2 , dark-Fenton, and UVC-Fenton
  • Autor: Cunha-Filho, Fernando José Vieira ; do Nascimento Silva, Douglas ; do Nascimento, Claudio Augusto Oller ; Chiavone-Filho, Osvaldo ; Mota-Lima, Andressa
  • Assuntos: Hydrogen Peroxide ; Iron ; Oxidation-Reduction ; Temperature ; Water Pollutants, Chemical - analysis
  • É parte de: Environmental science and pollution research international, 2023-02, Vol.30 (6), p.14860
  • Descrição: Hydrochlorothiazide (HCT) is a pharmaceutical micropollutant highly toxic to the environment, being absolutely necessary to oxidize it completely to CO . Here, the variables stoichiometric H2O2 excess for (a) degradation and (b) mineralization are defined and used as metric to quantify the dosimetry of the H O . So that, dose of H O qualifies being under- and over-dose respectively for values below and above such standards. In this work, these concepts have been elucidated across AOPs regarding the H O degradation excess, whereas only UVC-Fenton was used regarding the H O mineralization excess. At a H O mineralization excess of 0.68 (equivalent to degradation excess of 36.74), oxidation via UVC-H O enables absolute (100%) HCT degradation within 60 min; however, the mineralization of HCT demonstrated limited optimization for all AOPs employed in the beaker-like reactor of this work, being the underlying reasons investigated hereby. At best, 26.70% HCT mineralization was observed within 60 min of UVC photo-Fenton using an initial 2.00 H O mineralization excess. Such mineralization of 26.7% is unexpectedly low considering that, in addition, the residual H O concentration almost fully depletes within 30 min of UVC-Fenton oxidation. Taken all that together, the loss of H O due its decomposition induced by the risen temperature from 28 to 70ºC very likely were the underlying reason preventing better mineralization performance. We successfully demonstrated 18% of mean efficiency of radical •OH consumption signals that the overheating is indeed a designer problem with the photo-reactor since a well-refrigerated photo-reactor shows a mean efficiency of 38% for the same H O excess.
  • Editor: Germany
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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