Ke-Zhi Zhang

Publications (3)4.31 Total impact

• Article: Preparation and characterization of mesoporous TiO2-pillared titanate photocatalyst

  Zhi-Jian Chen, Bi-Zhou Lin, Bai-Huan Xu, Xiao-Li Li, Qin-Qin Wang, Ke-Zhi Zhang, Ming-Can Zhu
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  ABSTRACT: Mesoporous anatase TiO2-pillared titanate has been successfully prepared by the exfoliation-restacking route. The resulting nanocomposite was characterized by powder X-ray diffraction, scanning electron microscope, thermogravimetric analysis, IR and UV–Vis spectroscopy, specific surface area and porosity measurements. It was revealed that the present nanocomposite exhibits greatly expanded specific surface area (~200m2g−1) with 2.8- and 6.6-nm-in-diameter mesopore structure, and that there exists an electronic coupling between the host titanate sheets and the guest anatase TiO2 nanoparticles in the pillared system. The results of degradation of methylene blue under ultraviolet and visible radiation show that the present nanocomposite exhibits much higher photocatalytic activities than that of TiO2 nanoparticles or layered titanate alone, which are based on the bandgap excitation and the dye sensitization. KeywordsIntercalation materials–Mesoporous materials–Titanate–Anatase–Photocatalyst
  Journal of Porous Materials 04/2012; 18(2):185-193. · 1.24 Impact Factor
• Article: Fe-doped and ZnO-pillared titanates as visible-light-driven photocatalysts.

  Ke-Zhi Zhang, Bi-Zhou Lin, Yi-Lin Chen, Bai-Huan Xu, Xue-Tao Pian, Ji-Dong Kuang, Bin Li
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  ABSTRACT: Fe-doped cesium titanate was obtained by a solid state reaction with a mixture of Cs(2)CO(3), TiO(2), and Fe(2)O(3). ZnO-pillared doped titanate nanocomposite was successfully fabricated by exfoliating doped titanate and restacking its nanosheets with ZnO nanoparticles. The resulting nanocomposite was characterized by powder X-ray diffraction, scanning electron microscope, X-ray photoelectron spectroscopy, N(2) adsorption-desorption measurement, thermogravimetric analysis and UV-vis spectroscopy. It was revealed that the present nanocomposite exhibits greatly increased specific surface area with mesoporous texture and that there exists an electronic coupling between the host sheets and the guest nanoparticles in the pillared system. The results of degradation of methylene blue under visible light radiation suggest that doping iron ions improves the material spectral response region and that hybridizing with ZnO nanopillars can suppress the recombination of photogenerated electron-hole pairs.
  Journal of Colloid and Interface Science 06/2011; 358(2):360-8. · 3.07 Impact Factor
• Article: Pillared Nanocomposite TiO2/Bi-Doped Hexaniobate with Visible-Light Photocatalytic Activity

  Xue-Tao Pian, Bi-Zhou Lin, Yi-Lin Chen, Ji-Dong Kuang, Ke-Zhi Zhang, Li-Mei Fu
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  ABSTRACT: Under the strategies of doping to extend the absorptive response region of a semiconductor and fabricating a heterojunction structure to suppress the recombination of the photogenerated electron−hole pairs, a TiO2-pillared Bi-doped hexaniobate nanocomposite was prepared via a solid state reaction and a subsequent exfoliation−restacking route. The as-prepared pillared nanocomposite was characterized by powder X-ray diffraction, scanning electron microscope, X-ray photoelectron spectroscopy, UV−vis, and N2 adsorption−desorption measurements. It was revealed that the host 2D sheet structure was retained after doping, exfoliation, and restacking. The pillared nanocomposite is mesoporous with a high specific surface area (more than 110 m2/g) and shows a good photocatalytic activity in the degradation of methylene blue under visible light irradiation. A photoexcitation model in the semiconductor−semiconductor pillared photocatalyst was proposed based on the results of XPS, UV−vis, and photoelectrochemical studies.
  03/2011;