Zhenfeng Zhu

Publications (2)6.16 Total impact

• Article: Two-step template-free route for synthesis of TiO2 hollow spheres

  Zhenfeng Zhu, Zuoli He, Junqi Li, Jiaqi Zhou, Na Wei, Dianguang Liu
  [show abstract] [hide abstract]
  ABSTRACT: The TiO2 hollow microspheres were prepared by microwave-assisted solvothermal treatment without template. The morphology and the phase of TiO2 hollow microspheres were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HR-TEM), and BET surface areas. The results show that the particles have hollow structures and the shell was covered by nanocrystals and have higher specific surface area. The possible formation mechanism of hollow TiO2 spherical structures has simply been proposed. The activity was evaluated by the photocatalytic degradation of methyl orange (MO). The results show that the particles having specific surface area show higher photocatalytic activity. It can be attribute to the doped F atoms and the creation of oxygen vacancies.
  Journal of Materials Science 05/2012; 46(4):931-937. · 2.02 Impact Factor
• Article: Characterization and activity of mesoporous titanium dioxide beads with high surface areas and controllable pore sizes.

  Zuoli He, Zhenfeng Zhu, Junqi Li, Jiaqi Zhou, Na Wei
  [show abstract] [hide abstract]
  ABSTRACT: Mesoporous titanium dioxide beads with high surface areas (over 90 m(2)/g) and tunable pore sizes (from 12.8 to 16.5 nm) were synthesized via a solvothermal process heating by microwave irradiation, with ammonia being used as both a source of nitrogen and a control agent for the mesoporous structure. Structural characterization indicated that the mesoporous TiO(2) beads were composed of nanocrystals and pores and the beads possess a optical band gap energy of 3.11 eV. The doping nitrogen was in the form of NH(x) or NO(x) species and was adsorbed on surface of the beads, which caused changes to the surface electronic structure. The results show that the samples which possess higher-order structure, large surface area and well-defined crystallinity have the best performance in photocatalytic activities exhibited as evaluated in the degradation of methylene blue.
  Journal of hazardous materials 03/2011; 190(1-3):133-9. · 4.14 Impact Factor