Dual-functional photocatalysis using a ternary hybrid of TiO2 modified with graphene oxide along with Pt and fluoride for H2-producing water treatment

Young Jin Cho, Hyoung Il Kim, Seockheon Lee, Wonyong Choi

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Abstract

Dual-functional photocatalysis for simultaneous H2 production and degradation of organic pollutants has been proposed as an ecofriendly method of water treatment. In this study, we designed and prepared TiO2 modified with ternary components (graphene oxide (GO), Pt, or fluoride (or phosphate)) to enhance the dual-functional photocatalytic activity. The photocatalytic and photoelectrochemical properties of the ternary hybrid photocatalyst were investigated and compared with those of photocatalysts modified with binary components (Pt/TiO2-F, GO/TiO2-F, and Pt/GO/TiO2). Pt/GO/TiO2-F showed 1.7 and 3.8 times higher H2 production than Pt/TiO2-F and Pt/GO/TiO2, respectively. GO layers on TiO2 appeared to attract electrons, and interfacial electron transfer was facilitated by direct contact between GO and the TiO2 surface. However, the positive effect of GO on the dual photocatalytic activity was observed only when Pt and surface fluoride were co-present. The presence of GO facilitates electron transfer to Pt, while the presence of surface fluoride that substitutes for the surface hydroxyl groups (hole trap site) reduces the number of surface trapped holes and subsequently retards surface recombination. The dual-functional photocatalytic activity of Pt/GO/TiO2-F was maintained during repeated photocatalysis runs using the same batch of catalyst. The positive effect of GO on ternary hybrid titania was also observed when phosphate was used instead of fluoride.

Original languageEnglish
Pages (from-to)387-395
Number of pages9
JournalJournal of Catalysis
Volume330
DOIs
Publication statusPublished - 2015 Aug 22

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All Science Journal Classification (ASJC) codes

  • Catalysis
  • Physical and Theoretical Chemistry

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