Synthesis and Photocatalytic Properties of Titanium-Porphyrinic Aerogels

Yesub Keum, Bongkyeom Kim, Asong Byun, Jinhee Park

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

We present novel titanium-porphyrinic gels (TPGs) and titanium-porphyrinic aerogels (TPAs), in which porphyrinic ligand tetrakis(4-carboxyphenyl)porphyrin is coordinated to Ti-oxo clusters. These hierarchically porous TPAs, with micro-, meso-, and macropores and reactant-concentration-dependent Brunauer-Emmett-Teller surface areas of 407–738 m2 g−1, are prepared by CO2 critical point drying of TPGs. Although the Ti4+ → Ti3+ photoreduction of TPAs is less efficient than that of crystalline microporous Ti-porphyrinic framework DGIST-1, prompt diffusion of O2 and spin-trapping agents into the TPA pores causes the rapid generation of reactive oxygen species (ROS), as observed by EPR spectroscopy. When used as an ROS scavenger, large 1,3-diphenylisobenzofuran is degraded by the best-performing TPA 10 times faster than by DGIST-1, suggesting that the accessibility of molecules (reactants) to pores (reactive centers) strongly influences photocatalytic activity.

Original languageEnglish
Pages (from-to)21591-21596
Number of pages6
JournalAngewandte Chemie - International Edition
Volume59
Issue number48
DOIs
StatePublished - 23 Nov 2020

Bibliographical note

Publisher Copyright:
© 2020 Wiley-VCH GmbH

Keywords

  • hierarchical porosity
  • metal–organic aerogels
  • photocatalysis
  • photooxidation
  • reactive oxygen species

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