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SUMMARY:EESS talk on "Photoinduced reactions in sunlit surface waters"
DTSTART:20160223T121500
DTEND:20160223T131500
DTSTAMP:20260427T205751Z
UID:6a6617322cc49fec3dfbf7cff032968b1688dfe5d32fa52cb88e76ad
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Davide Vione\, Associate Professor\, Dept. of Analytical Ch
 emistry\, University of Torino\, IT\nAbstract:\nThe interaction between su
 rface waters and sunlight induces several photochemical reactions that pla
 y an important role in the transformation of naturally occurring compounds
  and xenobiotics\, in the inactivation of pathogens and in biogeochemical 
 cycles. These processes partially involve the direct photolysis of the tar
 get molecules (where transformation is directly triggered by absorption of
  sunlight\, if applicable)\, and partially their indirect or sensitised tr
 ansformation. In the latter case\, sunlight is absorbed by naturally-occur
 ring photosensitisers (e.g. chromophoric dissolved organic matter or CDOM\
 , nitrate and nitrite) to produce a range of reactive transient species th
 at are involved in transformation reactions. The transients include\, amon
 g others\, the hydroxyl (•OH) and carbonate (CO3•) radicals\, singl
 et oxygen (1O2) and CDOM triplet states (3CDOM*). Their occurrence in surf
 ace-water environments is linked to key water parameters such as chemistry
  and depth [1\,2].\nTherefore\, the phototransformation of dissolved compo
 unds involves an interplay between molecular features (e.g. photochemical 
 reactivity or stability toward different reaction pathways) and environmen
 tal characteristics. As far as the latter are concerned\, water chemistry 
 and depth can affect both the persistence of the relevant solutes and the 
 possible formation of intermediates that can be more toxic than the parent
  molecules. In particular\, if an hazardous compound is preferentially pro
 duced by a certain photoreaction pathway\, the environmental conditions ca
 n enhance or prevent its formation in different surface-water environments
  [3\,4].\nA potentially very important issue that is presently poorly know
 n is the role that climate change may have on surface-water chemistry and\
 , as a consequence\, on photochemical reactions. The main difficulty in th
 is context is the disentangling between climate effects and other disturba
 nce factors (e.g. wastewater inputs) that may also operate on the long ter
 m and undergo modifications with a long-time scale. In this context\, it i
 s very important to select water chemistry features that may act as climat
 e proxies\, such as alkalinity [5].\n[1] M.A. Young\, Environmental Photoc
 hemistry in Surface Waters\, Wiley\, 2005.\n[2] P. Boule\, D.W. Bahnemann\
 , P.K.J. Robertson (eds.)\, Environmental Photochemistry Part II\, Springe
 r\, 2005.\n[3] D. Vione\, M. Minella\, V. Maurino\, C. Minero\, Chemistry 
 - A European Journal 2014\, 20\, 10590-10606.Short biography:\nDavide Vion
 e received his PhD in Chemistry in 2001 from the University of Torino\, wh
 ere he has been Assistant Professor (2002-2011) and is presently Associate
  Professor (from 2011) in the Department of Chemistry. His research intere
 sts mainly focus on the study and modelling of photochemical reactions in 
 sunlit surface and atmospheric waters\, with an additional interest in adv
 anced oxidation processes for water treatment (heterogeneous photocatalysi
 s\, Fenton and photo-Fenton reactions). The modelling of photochemical rea
 ctions in surface waters has recently involved the development of a softwa
 re (Aqueous Photochemistry of Environmentally-occurring Xenobiotics) to pr
 edict the occurrence of photo-induced transients\, the photodegradation of
  xenobiotics and the formation of intermediates\, as a function of water c
 hemistry and depth. His research work resulted so far in over 170 research
  papers in ISI journals.
LOCATION:GR C0 01 http://plan.epfl.ch/?room=GR%20C0%2001
STATUS:CONFIRMED
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