Chem. J. Chinese Universities ›› 2018, Vol. 39 ›› Issue (4): 629.doi: 10.7503/cjcu20170425

• Articles: Inorganic Chemistry • Previous Articles     Next Articles

Synthesis and Properties of Bi25FeO40/α-Fe2O3 Composite Nanoparticle Photocatalysts

CONG Rimin1,*(), YU Huaiqing1, LUO Yunjun2, LI Jiao1, WANG Weiwei1, LI Qiuhong1, SUN Wuzhu1, SI Weimeng1, ZHANG Hua1   

  1. 1. School of Materials Science and Engineering, Shandong University of Technology, Zibo 255049, China
    2. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
  • Received:2017-07-03 Online:2018-04-10 Published:2018-03-21
  • Contact: CONG Rimin E-mail:congrimin0219@163.com
  • Supported by:
    † Supported by the Project of Shandong Province Higher Educational Science and Technology Program, China(No.J11LD12), the Natural Science Foundation of Shandong Province, China(Nos.ZR2011BL006, ZR2010BM011, ZR2015BM02) and the Young Teachers Program of Shandong University of Technology, China

Abstract:

Pure Bi25FeO40 nanoparticles and Bi25FeO40/α-Fe2O3 composite nanoparticles were synthsized through solvothermal porcess by using polyamidoamine(PAMAM) dendrimer stabilizer with a Bi3+/Fe3+ molar ratio of 25:1 and 1:1 in the reaction system, respectively. The structure, morphology and properties of the samples were characterized by X-ray diffraction(XRD), high resolution transmission electron microscopy(HRTEM), X-ray photoelectron spectroscopy(XPS), ultraviolet-visible spectroscopy(UV-Vis), Brunauer-Emmett-Teller(BET) surface area analysis and magnetic hysteresis loops measurenent. The results show that these particles are uniform balls with the diameter less than 10 nm. Compared with pure Bi25FeO40 nanoparticles, Bi25FeO40/α-Fe2O3 composite nanoparticles have smaller band gap, broader visible light absorption range, and significantly greater saturation magnetization and photocatalytic activity. These excellent properties of Bi25FeO40/α-Fe2O3 composite nanoparticles come from the superparamagnetic α-Fe2O3 component, and the heterogeneous structure of the phase boundary which promotes the efficient separation and migration of photogenerated carriers at the junction interfaces. These nanoparticles could be recycled in external magnetic field, and the catalytic activity decreased slightly after being reused for 3 times.

Key words: Bi25FeO40, α-Fe2O3, Composite nanoparticles, Magnetic property, Photocatalyst

CLC Number: 

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