Xue-mei Wang

The Northwest Normal University, Kao-lan-hsien, Gansu Sheng, China

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Publications (3)2.59 Total impact

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    ABSTRACT: A novel mesoporous-coated stainless steel wire microextraction coupled with the HPLC procedure for quantification of four polycyclic aromatic hydrocarbons in water has been developed, based on the sorption of target analytes on a selectively adsorptive fiber and subsequent desorption of analytes directly into HPLC. Phenyl-functionalized mesoporous materials (Ph-SBA-15) were synthesized and coated on the surfaces of a stainless steel wire. Due to the high porosity and large surface area of the Ph-SBA-15, high extraction efficiency is expected. The influence of various parameters on polycyclic aromatic hydrocarbons extraction efficiency were thoroughly studied and optimized (such as the extraction temperature, the extraction time, the desorption time, the stirring rate and the ionic strength of samples). The results showed that each compound for the analysis of real water samples was tested under optimal conditions with the linearity ranging from 1.02×10(-3) to 200  μg/ L and the detection limits were found from 0.32 to 2.44  ng/ L, respectively. The RSD of the new method was smaller than 4.10%.
    Journal of Separation Science 10/2010; 33(20):3239-44. · 2.59 Impact Factor
  • Xue-mei Wang, Xin-zhen Du, Chun-lan Li, Xu Cao
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    ABSTRACT: Organic–inorganic hybrid mesoporous silicas of SBA-15 with different sizes of organic functionalities of methyl, propyl, or octyl were prepared by the single-step co-condensation of inexpensive tetraethyl orthosilicate and organotrialkoxysilane using Pluronic P123 as a templating agent under acidic conditions. Samples were characterized by FT-IR, XRD, TEM and SEM. The results show that different alkyl groups are attached covalently to the pore wall of SBA-15 after modification, respectively. The functionalized materials still preserve a desirable ordered two-dimensional P6mm hexagonal structure although the organotrialkoxysilane molar ratio is as high as 20%.
    Materials Letters. 01/2008; 62:3232-3235.
  • Xue-mei Wang, Xin-zhen Du, Chun-lan Li, Xu Cao
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    ABSTRACT: Phenyl-functionalized SBA-15 materials (Ph-SBA-15) were directly synthesized by using tri-block copolymer Pluronic P123 as templating agent under acidic conditions. The samples were characterized by Fourier transform infrared (FT-IR) spectra, X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), thermogravimetry analysis (TGA) and N2 adsorption–desorption. The results show that the phenyl groups are covalently attached to the pore wall of SBA-15 after modification. The functionalized materials still preserve a desirable two-dimensional P6mm hexagonal structure and have large specific surface area and pore volume although the molar ratio of phenyltrimethoxysilane in total silica precursors is as high as 23.0%.
    Applied Surface Science - APPL SURF SCI. 01/2008; 254(13):3753-3757.