Highly visible-light absorbing black TiO2 nanocrystals synthesized by sol-gel method and subsequent heat treatment in low partial pressure H2

Ming Chung Wu*, I. Chun Chang, Kai Chi Hsiao, Wei Kang Huang

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

21 Scopus citations

Abstract

We present here a novel method for producing highly visible-light absorbing black TiO2 nanocrystals by combining sol-gel synthesis and subsequent heat treatment in low partial pressure H2. The synthesized black TiO2 nanocrystals with trivalent titanium, oxygen vacancies and structural defects show a significantly lowered optical bandgap in reference to white TiO2. Photodegradation of methyl orange under visible light irradiation indicates the synthesized black TiO2 is superior to the commercial TiO2-P25. The developed process is simple, cost-effective, safe and allows producing a series of visible spectrum active catalysts without the need for metal doping or decoration.

Original languageEnglish
Pages (from-to)430-435
Number of pages6
JournalJournal of the Taiwan Institute of Chemical Engineers
Volume63
DOIs
StatePublished - 01 06 2016

Bibliographical note

Publisher Copyright:
© 2016 Taiwan Institute of Chemical Engineers.

Keywords

  • Nanostructures
  • Photocatalyst
  • Photodegradation
  • TiO

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