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Title: The visible light degradation activity and the photocatalytic mechanism of tetra(4-carboxyphenyl) porphyrin sensitized TiO{sub 2}

Highlights: • Tetra(4-carboxyphenyl) porphyrin were chemically sensitized on TiO{sub 2}. • S2–S0 fluorescence intensity is enhanced and lifetime prolonged noticeably by TiO{sub 2}. • The TCPP-TiO{sub 2} exhibits better photoactivity under visible light than that of TiO{sub 2}. • The electronic relaxation dynamics is presented, catalytic mechanism is discussed. • Adsorption and photo degradation of MB were systematically investigated. - Abstract: Tetra(4-carboxyphenyl) porphyrin(TCPP) were chemically sensitized on TiO{sub 2} to act as visible light antenna and to modify the photoresponse properties of TiO{sub 2} particles, their properties of photo-generated holes and electrons were studied by transient absorption spectroscopes. The time-correlated single-photon counting (TCSPC) technique revealed that the S2–S0 fluorescence intensity of TCPP is enhanced noticeably by TiO{sub 2}, and the lifetime prolonged. Adsorption and photo degradation of methylene blue (MB) over TCPP-TiO{sub 2} were systematically investigated. Moreover the overall picture of electronic relaxation dynamics for TCPP-TiO{sub 2} is presented, and the detailed short-time dynamics for visible-light induced catalytic mechanism was discussed. The development of the porphyrin-based photocatalyst provides an alternative approach in harnessing solar visible light and show promising prospect for the treatment of dye pollutants from wastewaters in future industrial application.
Authors:
 [1] ;  [2] ;  [3] ; ; ;  [1] ;  [1] ; ;  [4]
  1. Department of Chemistry and Engineering Research Center for Eco-dyeing and Finishing of Textiles, MOE, Zhejiang Sci-Tech University, Hangzhou 310018 (China)
  2. (China)
  3. (Germany)
  4. Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong SAR (China)
Publication Date:
OSTI Identifier:
22420569
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 57; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTROSCOPY; ADSORPTION; ELECTRONS; FLUORESCENCE; HOLES; INFRARED SPECTRA; LIFETIME; METHYLENE BLUE; PARTICLES; PHOTOCATALYSIS; PHOTONS; POLLUTANTS; PORPHYRINS; RELAXATION; TITANIUM OXIDES; TRANSIENTS; VISIBLE RADIATION; X-RAY DIFFRACTION