Citation: Jing Li, Yan Xu, Wei Yue, Yan Chen, Xi-Hua Dub, Shao-Rong Wang. Synthesis and study of Bi₂Ti₂O₇/TiO₂ composites as efficient visible-light-active photocatalysts in the reduction of aqueous Cr(VI)[J]. Chinese Chemical Letters, ;2016, 27(6): 867-870. doi: 10.1016/j.cclet.2016.01.031 shu

Synthesis and study of Bi₂Ti₂O₇/TiO₂ composites as efficient visible-light-active photocatalysts in the reduction of aqueous Cr(VI)

Jing Li ^a,b, ,
Yan Xu ^b ,
Wei Yue ^b ,
Yan Chen ^b ,
Xi-Hua Dub ^b ,
Shao-Rong Wang ^a

a College of Chemical Engineering, China University of Mining and Technology, Xuzhou 221008, China;
b School of Chemistry and Chemical Engineering, Xuzhou Institute of Technology, Xuzhou 221111, China

Received Date: 12 October 2015
Revised Date: 22 November 2015

Fund Project: A project funded by Natural Science Fund for Colleges and Universities in Jiangsu Province (No. 14KJB430022), the Cultivating project of Xuzhou Institute of Technology (No. XKY2014103), Innovative entrepreneurial training program of college student in Jiangsu province (No. xcx2015043), and The Opening Fund of Jiangsu Key Laboratory of Environmental Material and Environmental Engineering.

In this work, Bi₂Ti₂O₇/TiO₂ composites were synthesized and studied as potential visible-light-activated photocatalysts in the reduction of aqueous Cr(VI). Bi₂Ti₂O₇/TiO₂ composites with tunable compositions were synthesized via a solvothermal-calcination two-step method, simply by changing the molar ratios of Bi(NO₃)₃·5H₂O to tetrabutyl titanate in the reactants. The compositions, structures and optical properties of the as-synthesized Bi₂Ti₂O₇/TiO₂ composites were characterized by X-ray diffraction, field emission scanning electron microscopy and UV-vis diffuse reflectance spectra. The photocatalytic activity of the as-synthesized Bi₂Ti₂O₇/TiO₂ composites was tested in the reduction of aqueous Cr(VI) under visible-light (λ > 420 nm) irradiation, and compared with that of TiO₂ nanoparticles. It was observed that the as-synthesized Bi₂Ti₂O₇/TiO₂ composites exhibited much higher photocatalytic activity than TiO₂ nanoparticles, and the most efficient composite (300 mg) can achieve the complete reduction of Cr(VI) in 300 mL of 50 mg/L K₂Cr₂O₇ aqueous solution under visible-light (λ > 420 nm) irradiation in 90 min.
- Nanocomposites,
- Functional,
- Powder technology,
- Semiconductor
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通讯作者: 陈斌, bchen63@163.com

Synthesis and study of Bi₂Ti₂O₇/TiO₂ composites as efficient visible-light-active photocatalysts in the reduction of aqueous Cr(VI)