Decomposition of diclofenac by solar driven photocatalysis at pilot plant scale

Pérez-Estrada, L. A., Maldonado, M. I., Gernjak, W., Agüera, A., Fernández-Alba, A. R., Ballesteros, M. M. and Malato, S. (2005). Decomposition of diclofenac by solar driven photocatalysis at pilot plant scale. In: Catalysis Today - Environmental Applications of Photocatalysis, 3rd European Meeting on Solar Chemistry and Photocatalysis: Environmental Applications. Environmental Applications of Photocatalysis, 3rd European Meeting on Solar Chemistry and Photocatalysis: Environmental Applications, Barcelona, (219-226). 30 June- 2 July, 2004. doi:10.1016/j.cattod.2005.03.013

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Author Pérez-Estrada, L. A.
Maldonado, M. I.
Gernjak, W.
Agüera, A.
Fernández-Alba, A. R.
Ballesteros, M. M.
Malato, S.
Title of paper Decomposition of diclofenac by solar driven photocatalysis at pilot plant scale
Conference name Environmental Applications of Photocatalysis, 3rd European Meeting on Solar Chemistry and Photocatalysis: Environmental Applications
Conference location Barcelona
Conference dates 30 June- 2 July, 2004
Proceedings title Catalysis Today - Environmental Applications of Photocatalysis, 3rd European Meeting on Solar Chemistry and Photocatalysis: Environmental Applications   Check publisher's open access policy
Journal name Catalysis Today   Check publisher's open access policy
Place of Publication Amsterdam
Publisher Elsevier Science Publishers
Publication Year 2005
Year available 2005
Sub-type Fully published paper
DOI 10.1016/j.cattod.2005.03.013
ISSN 0920-5861
Volume 101
Issue 3-4
Start page 219
End page 226
Total pages 8
Language eng
Abstract/Summary Pilot plant experiments applying solar titanium dioxide photocatalysis and solar photo-Fenton treatment at different pH and iron concentrations with an initial diclofenac concentration of 50 mg L−1 are described. In preliminary experiments absence of hydrolysis and slow photolysis under solar irradiation of diclofenac solutions were observed. Solar photo-Fenton treatment with freshly precipitated iron at pH around 7 showed first order kinetics, the reaction taking place on the surface of the iron precipitate. Simultaneous oxidation, precipitation and re-dissolution processes of diclofenac governed photo-Fenton decomposition kinetics at pH 2.8. The use of different iron concentrations (0.03–0.75 mM) showed no influence on the reaction rate in a neutral medium due to reactor geometry. Similar behaviour (no influence of iron concentration) was observed at pH 2.8, due to precipitation problems. A pH of around 4, close to the pKa of diclofenac, showed promising results, partly overcoming both iron and diclofenac precipitation. Solar titanium dioxide photocatalysis with Degussa P-25 followed first order kinetics and no precipitation or adsorption occurred. Decomposition of diclofenac took around 100 min under all photo-Fenton treatment conditions employed. Decomposition by titanium dioxide photocatalysis took about 200 min. In photo-Fenton treatment, hydrogen peroxide consumption to diclofenac decomposition was about 80–110 mM at pH 2.8 and 40 mM in the other two treatments (neutral pH and pH = 4).
Subjects 090409 Wastewater Treatment Processes
Keyword Diclofenac
Non-steroidal anti-inflammatory drugs
Solar photocatalysis
Photo-Fenton
Advanced oxidation process
Wastewater treatment
Q-Index Code E1

 
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