ISGS eSeminar, May 2022


Sol-gel approach to understand the role of defects in photocatalysis with TiO2 


Sara A. Bilmes

INQUIMAE – Universidad de Buenos Aires – CONICET, Argentina


Photocatalysis is a well-known process for removing organic pollu-tants, inactivating bacteria or producing H2 with sun- or artificial light. TiO2 is the most promising catalyst material, even if the overall efficiency of the process is low. Several intertwined parameters such as crystallinity, particle size and oxygen vacancies still need to be understood for increasing efficiency. Oxygen vacancies have a double influence on photocatalysis as they generate Ti(III) sites that trap holes and stabilise (or destabilise) the most active anatase phase with increasing temperature.

This presentation will discuss the role of oxygen vacancies in elec-tron-hole pair recombination and in the anatase-rutile phase transi-tion for doped and undoped TiO2 films and particles. Selected sol-gel based syntheses to introduce oxygen vacancies in a controlled way into TiO2 particles and films are analysed and correlated with the photocatalytic activity towards the degradation of model organic molecules in air and water.

It is our pleasure to invite you to join the ISGS eSeminar for May 2022, which will be delivered by Professor Sara Bilmes on Tues-day 10 May. As announced in the September 2021 issue of the ISGS Newsletter, Sara is a recipient of the ISGS Life Achievement Award and her career journey, including her contributions to the development of a vibrant sol-gel community in South America, was profiled in the August 2021 issue of the Newsletter.

Date: Tuesday 10 May 2022


  • ZOOM (eSeminar link), Meeting ID: 307 291 6432 Passcode: >FJ=DNkF 


  • 09:00 – USA, East Coast
  • 10:00 – Argentina, Brazil (São Paulo) 
  • 14:00 – UTC
  • 14:00 – UK, Portugal
  • 15:00 – Austria, Central Europe, Sweden, Norway
  • 16:00 – Romania, Israel, Eastern Europe, Ukraine
  • 16:00 – Russia (Moscow, St Petersburg)
  • 21:00 – China, Singapore, Malaysia
  • 22:00 – Japan
  • 23:00 – Australia (East Coast)