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  4. Acids from fruits generate photoactive Fe-complexes, enhancing solar disinfection of water (SODIS): A systematic study of the novel " fruto-Fenton " process, effective over a wide pH range (4-9) .
 
research article

Acids from fruits generate photoactive Fe-complexes, enhancing solar disinfection of water (SODIS): A systematic study of the novel " fruto-Fenton " process, effective over a wide pH range (4-9) .

Farinelli, Giulio
•
Giannakis, Stefanos
•
Schaub, Aline Laetitia  
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March 29, 2024
Water Research

This study aimed to enhance solar disinfection (SODIS) by the photo-Fenton process, operated at natural pH, through the re-utilization of fruit wastes. For this purpose, pure organic acids present in fruits and alimentary wastes were tested and compared with synthetic complexing agents. Owing to solar light, complexes between iron and artificial or natural chelators can be regenerated through ligand-to-metal charge transfer (LMCT) during disinfection. The target complexes were photoactive under solar light, and the Fe:Ligand ratios for ex situ prepared iron complexes were assessed, achieving a balance between iron solubilization and competition with bacteria as a target for oxidizing species. In addition, waste extracts containing natural acidic ligands were an excellent raw material for our disinfection enhancement purposes. Indeed, lemon and orange juice or their peel infusions turned out to be more efficient than commercially available organic acids, leading to complete inactivation in less than 1 h by this novel "fruto-Fenton" process, i.e. in the presence of a fruit-derived ligand, Fe(II) and H2O2. Finally, its application in Lake Leman water and in situ complex generation led to effective bacterial inactivation, even in mildly alkaline surface waters. This work proposes interesting SODIS and fruit-mediated photo-Fenton enhancements for bacterial inactivation in resource-poor contexts and/or under the prism of circular economy.

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Type
research article
DOI
10.1016/j.watres.2024.121518
Web of Science ID

WOS:001218374800001

Author(s)
Farinelli, Giulio
•
Giannakis, Stefanos
•
Schaub, Aline Laetitia  
•
Kohantorabi, Mona
•
Pulgarin, Cesar
Date Issued

2024-03-29

Publisher

Pergamon-Elsevier Science Ltd

Published in
Water Research
Volume

255

Article Number

121518

Subjects

Technology

•

Life Sciences & Biomedicine

•

Physical Sciences

•

Solar Disinfection (Sodis)

•

Bacterial Inactivation

•

Photo -Fenton Process

•

Drinking Water

•

Natural Organic Acids

•

Iron Complex

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LCE
FunderGrant Number

Agencia Estatal de Investigacion (Spain)

REDDIS project, "Procesos reductivos como el Talon de Aquiles bacteriano en la desinfeccion de aguas residuales y en aguas naturales" from Agencia Estatal de Investigacion (Spain)

CNS2022-135728

Project "S-FOX" - EU HORIZON-MSCA-2021-PF-01 program

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Available on Infoscience
June 5, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/208306
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