Photocatalytic ZnO Foams for Micropollutant Degradation

Thais Tasso Guaraldo, Jannis Wenk, Davide Mattia

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

Photocatalytic foams can concomitantly overcome the disadvantages of slurry and immobilized photocatalysts in water treatment. However, foams have, so far, been restricted to nanoparticles grafting onto inert foam substrates, with the consequent risk of nanoparticle release into the environment. In this work, self-supporting, highly porous photocatalytic zinc oxide (ZnO) foams are produced using a combination of liquid templating and sintering for the first time. Systematic changes in sintering times and temperature affect the foams’ morphology and structure, in turn controlling their photocatalytic activity and stability. Sintering at 900 °C and decreasing sintering times from 20 to 6 h lead to a doubling in surface-area-to-volume ratio and a 30% increase in pore diameter, resulting in a near doubling of the overall quantum yield and degradation kinetics. However, photocorrosion and Zn leaching increase markedly for the shortest sintering time. Optimal sintering conditions at 900 °C for 12 h yield foams capable of effectively degrading the model micropollutant carbamazepine under UV irradiation with high stability, showing no performance decrease over five irradiation cycles corresponding to 20 h of use. This study paves the way to producing self-supporting, highly stable photocatalytic foams for the removal of organic micropollutants in water treatment.

Original languageEnglish
Article number2000208
Number of pages10
JournalAdvanced Sustainable Systems
Volume5
Issue number5
Early online date12 Mar 2021
DOIs
Publication statusPublished - 19 May 2021
Externally publishedYes

Bibliographical note

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Keywords

  • ZnO
  • foams
  • photocatalysis
  • photocatalytic foams

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Environmental Science(all)

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