Na Wei

Shaanxi University of Science and Technology, Syanyan, Shaanxi, China

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Publications (6)12.47 Total impact

  • Zhenfeng Zhu · Yanli Zhang · Hui Liu · Na Wei
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    ABSTRACT: The original spherical α-Ni(OH)2 architectures with many cubic particles growing from the surface were successfully synthesized by a microwave-assisted hydrothermal method using urea as hydrolysis-controlling agent and polyethylene glycol (PEG) as surfactant. The NiO architectures with similar morphology were obtained by simple thermal decomposition of the precursor α-Ni(OH)2. The as-obtained products were well characterized by XRD, FTIR, TGA, SEM, TEM, UV–Vis and CVs. The experimental results showed that the diameter of spherical α-Ni(OH)2 architectures was in the range of 2–4 μm. The side length of the cubic particles was uniform about 200 nm. The cyclic voltammetric results showed that the reversible behavior of NiO electrode change better with the increasing of the cycle index. The original NiO we have prepared are expected to have good electrochemical behavior.
    Superlattices and Microstructures 02/2012; 51(2):232–238. DOI:10.1016/j.spmi.2011.11.014 · 2.10 Impact Factor
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    ABSTRACT: A facile method has been developed to synthesis hierarchical nickel oxide with spherical particle morphologies, high surface area of 234 m(2)/g and narrow pore distribution at 3.25 nm by controlled thermal decomposition of the nickel nitrate hydroxide precursors. The as-obtained products were well characterized by XRD, SEM, TEM (HRTEM), SAED, FTIR and N2 adsorption-desorption measurement. It was shown that the hierarchical NiO microsphere with the diameter about 2.0 mu m is composed of hexagonal nanoparticles with mesoporous structure. The prepared mesoporous materials were used as an adsorbent to remove the Congo red pollutant contained in the waste water, and they exhibited more favorable adsorptive properties than the mesoporous alumina powders with same surface area due to its special structural features.
    05/2011; 239-242:252-258. DOI:10.4028/
  • Zhenfeng Zhu · Na Wei · Hui Liu · Zuoli He
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    ABSTRACT: The Ni(OH)2 architectures with flower-like morphology assembled from nanosheets have been successfully synthesized through a microwave-assisted hydrothermal method using urea as a hydrolysis-controlling agent and polyethylene glycol (PEG) as a surfactant. The NiO architectures with similar morphology were obtained by a simple thermal decomposition process of the precursor Ni(OH)2. The as-obtained products were well characterized by XRD, TG-DTA, SEM, TEM, FTIR and UV–Vis. The experimental results shown that flower-like Ni(OH)2 architectures with a diameter of 2.5–4.0μm are assembled from nanosheets with a thickness of 10–20nm and width of 0.5–1.5μm. The UV–Vis experimental results shown that the absorption edge of the NiO architectures have a blue-shift with the increasing of the calcination temperature.
    Advanced Powder Technology 05/2011; 22(3):422-426. DOI:10.1016/j.apt.2010.06.008 · 2.64 Impact Factor
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    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. DOI:10.1016/j.jhazmat.2011.03.011 · 4.53 Impact Factor
  • Z. F. Zhu · Z. L. He · J. Q. Li · D. G. Liu · N. Wei
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    ABSTRACT: A sonochemical–microwave hydrothermal method for preparing fluorinated mesoporous TiO2 microspheres was developed. Fabrication of mesoporous TiO2 and doping of fluorine were achieved by sonication and then hydrothermal treatment of a solution containing TiO2 precursor sol and sodium fluoride. The average diameter of as synthesised TiO2 microspheres was ∼500 nm. Since the sodium fluoride was doped, rod-like grains (12±0·5 nm) and microporous structure (∼10 nm) formed on the surface, he roughness was clearly increased, and the microspheres look like waxberries. UV-vis absorption spectra showed that samples within the wavelength range from 0 to 300 nm show strong UV absorption and 10 nm BM-shift, which was highly related to its microstructures. The TEM and high resolution TEM results showed a novel mechanism for fluorinated TiO2 microsphere formation, i.e. its rod-assembled mesoporous microstructures related to the absorption of water molecules on the surface of the microspheres.
    Material Research Innovations 11/2010; 14(5):426-430. DOI:10.1179/143307510X12820854749277 · 0.83 Impact Factor
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    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 02/2010; 46(4):931-937. DOI:10.1007/s10853-010-4837-1 · 2.37 Impact Factor