Journal of Northeastern University Natural Science ›› 2018, Vol. 39 ›› Issue (1): 138-142.DOI: 10.12068/j.issn.1005-3026.2018.01.028

• Resources & Civil Engineering • Previous Articles     Next Articles

TiO2 Photocatalyst Modified by Carbon Quantum Dots and Its Activity in Pollutants Degradation

JIANG Ting-ting1, SHI Yong2, KE Jun2,3, XU Kai-li1   

  1. 1. School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China; 2. School of Environment, Dalian University of Technology, Dalian 116024, China; 3. School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430074, China.
  • Received:2016-07-13 Revised:2016-07-13 Online:2018-01-15 Published:2018-01-31
  • Contact: SHI Yong
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Abstract: The nanocomposite photocatalyst TiO2 modified by carbon quantum dots(CQDs) was first prepared by sol-gel method and represented by fluorescence spectra, UV-vis absorption spectra, X-ray diffraction and scanning electron microscope. Then, the photocatalytic activity was investigated by degrading methylene blue(MB) in visible light. Results show that CQDs exhibits an upconversion fluorescence, meanwhile, the visible-light response of TiO2 modified by CQDs was significantly improved. For the TiO2/CQDs obtained by hydrothermal method under 180 ℃ lasting for 6h, when the doping amount is 10 mL, the photocatalytic activity is the highest. The degradation rate of MB comes to 80% after 115 min. The TiO2/CQDs is mainly composed by anatase, whose particles take on a spherical shape with a specific surface area up to 200 m3·g-1.

Key words: TiO2, carbon quantum dots(CQDs), sol-gel method, photocatalytic degradation, methylene blue

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