Hydrogen production upon UV-light irradiation of Cu/TiO2 photocatalyst in the presence of alkanol-amines

Marica Muscetta, Laura Clarizia, Corrado Garlisi, Giovanni Palmisano, Raffaele Marotta, Roberto Andreozzi, Ilaria Di Somma

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Photocatalytic hydrogen production from alkanol-amines as sacrificial agents by using Cu-modified TiO2–P25 prepared via in situ photodeposition of cupric ions under UV-A light irradiation was investigated. A direct comparison among different sacrificial agents (monoethanolamine, diethanolamine, and triethanolamine) was preliminarily performed. Diethanolamine was selected for further investigation, due to its higher hydrogen production rate with respect to other alkanol-amines. Effect of pH, starting concentration of sacrificial agent, and catalyst/co-catalyst loads were studied. Solution pH exerts major impact on the photoefficiency for hydrogen generation: reaction mechanisms at different pH values were extensively examined. For the first time, a validated kinetic model estimated the unknown rate constants of (i) reaction between diethanolamine and photogenerated holes, (ii) proton reduction, and (iii) diethanolamine adsorption on the photocatalyst surface.

Original languageBritish English
Pages (from-to)26701-26715
Number of pages15
JournalInternational Journal of Hydrogen Energy
Volume45
Issue number51
DOIs
StatePublished - 16 Oct 2020

Keywords

  • Alkanol-amines
  • Hydrogen production
  • Kinetic mechanism
  • Kinetic modeling
  • Photoreforming
  • Sacrificial photocatalysis

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