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Synthesis and Photocatalytic Properties of Titanium-Porphyrinic Aerogels

Title
Synthesis and Photocatalytic Properties of Titanium-Porphyrinic Aerogels
Authors
Keum, YesubKim, BongkyumByun, AsongPark, Jinhee
DGIST Authors
Park, Jinhee
Issue Date
2020-11
Citation
Angewandte Chemie - International Edition, 59(48), 21591-21596
Type
Article
Article Type
Article
Author Keywords
hierarchical porositymetal-organic aerogelsphotocatalysisphotooxidationreactive oxygen species
Keywords
METAL-ORGANIC FRAMEWORKDYE-SENSITIZED TIO2SINGLET OXYGENSELECTIVE PHOTOOXIDATIONCHARGE SEPARATIONOXO-CLUSTERSEFFICIENTOXIDATIONGELSMOF
ISSN
1433-7851
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. © 2020 Wiley-VCH GmbH
URI
http://hdl.handle.net/20.500.11750/12573
DOI
10.1002/anie.202007193
Publisher
Wiley-VCH Verlag
Related Researcher
  • Author Park, Jinhee Organic-Inorganic Hybrids Lab
  • Research Interests Organic-Inorganic Hybrid Materials; Metal-Organic Polyheda;Metal-Organic Frameworks; Porous Polymer Networks
Files:
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Collection:
Department of Emerging Materials ScienceOrganic-Inorganic Hybrids Lab1. Journal Articles


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