Citation: Lili Yin, Ming Zhao, Huilin Hu, Jinhua Ye, Defa Wang. Synthesis of graphene/tourmaline/TiO₂ composites with enhanced activity for photocatalytic degradation of 2-propanol[J]. Chinese Journal of Catalysis, ;2017, 38(8): 1307-1314. shu

Synthesis of graphene/tourmaline/TiO₂ composites with enhanced activity for photocatalytic degradation of 2-propanol

Lili Yin ^a, ,
Ming Zhao ^a ,
Huilin Hu ^a ,
Jinhua Ye ^a,b,c ,
Defa Wang ^a,b

a TJU-NIMS International Collaboration Laboratory, Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;
b Collaborative Innovation Center of Chemical Science and Engineering(Tianjin), Tianjin 300072, China;
c International Center of Materials Nanoarchitectonics(WPI-MANA), National Institute for Materials Science(NIMS), Tsukuba, Ibaraki 305-0044, Japan

Received Date: 29 December 2016
Revised Date: 28 January 2017

Fund Project: This work was supported by the National Basic Research Program of China (973 Program, 2014CB239300), the National Natural Science Foundation of China (51572191), and the Natural Science Foundation of Tianjin (13JCYBJC16600).

We report the construction of a graphene/tourmaline/TiO₂ (G/T/TiO₂) composite system with enhanced charge-carrier separation, and therefore enhanced photocatalytic properties, based on tailoring the surface-charged state of graphene and/or by introducing an external electric field arising from tourmaline. A simple two-step hydrothermal method was used to synthesize G/T/TiO₂ composites and poly(diallyldimethylammonium chloride)-G/T/TiO₂ composites. In the photocatalytic degradation of 2-propanol (IPA), the catalytic activity of the composite containing negatively charged graphene was higher than of the composite containing positively charged graphene. The highest acetone evolution rate (223 μmol/h) was achieved using the ternary composite with the optimum composition, i.e., G0.5/T5/TiO₂ (0.5 wt% graphene and 5 wt% tourmaline). The involvement of tourmaline and graphene in the composite is believed to facilitate the separation and transportation of electrons and holes photogenerated in TiO₂. This synergetic effect could account for the enhanced photocatalytic activity of the G/T/TiO₂ composite. A mechanistic study indicated that O₂^·- radicals and holes were the main reactive oxygen species in photocatalytic degradation of IPA.
- Photocatalysis,
- Graphene,
- Tourmaline,
- TiO₂,
- Composite,
- 2-Propanol,
- Degradation
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Synthesis of graphene/tourmaline/TiO₂ composites with enhanced activity for photocatalytic degradation of 2-propanol