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吴庆银, Qingyin Wu
Materials Chemistry and Physics 77(2002)204-208,-0001,():
-1年11月30日
Silica gels composited with undecatungstochromoferrous acid have been prepared by the sol-gel method. FT-IR spectra and SEM declared that theKeggin structure characteristic of the Fe(H2O)CrW11O39 6−anionwas found in the silica gel skeleton. The change of characteristic peaks in IR spectra was analyzed. XRD pattern showed that the gel was amorphous. The gel exhibited considerably high-proton conductivity, which increased from 1.88×10−3 to 1.11×10−2 S cm−1 with the increase of the content of undecatungstochromoferrous acid at 20℃.
Composite materials, Sol-gel growth, Fourier transform infrared spectroscopy, Electrical conductivity
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吴庆银, Qingyin Wu a, *, Shukun Wang b, Danni Li a, Xufeng Xie a
Inorganic Chemistry Communications 5(2002)308-311,-0001,():
-1年11月30日
The decatungstomolybdoniobogermanic heteropoly acid H5 [GeW10MoNbO40] 20H2O has been prepared for the first time. The optimal proportion of the solutions of the component and the pH of the synthesis reaction are given. The product was characterized by chemical analysis, conductometric and potentiometric titration, IR, UV, XRD, 183W NMR and TG-DTA. The IR, UV, XRD and 183WNMR indicate that H5 [GeW10MoNbO40] 20H2O possesses the Keggin structure. The TG-DTA curve shows the sequence of water loss in the acid, the amount of the loss as well as the thermostability of the acid.
Heteropoly acid, Deca-tungstomolybdoniobogermanic acid, Preparation, Characterization
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吴庆银, Yu Yang a, , Qingyin Wu c, Yihang Guo a, Changwen Hu a, b, *, Enbo Wang a
Journal of Molecular Catalysis A: Chemical 225(2005)203-212,-0001,():
-1年11月30日
A novel photocatalyst, nanoporous anatase TiO2 crystalline particles coupled by homogeneously dispersed Keggin unit, H3PW12O40/TiO2, was prepared by a simple and rapid process, i.e., at a lower temperature (200℃) by combined sol-gel and programmed temperature hydrothermal methods. The resulting material was characterized by UV diffuse reflectant spectroscopy, XRD, 31P MAS NMR, TEM, and nitrogen adsorption. This new photocatalyst exhibited visible-light photocatalytic activity to decompose 10 various organic dyes in aqueous systems. It was attempted to determine the feasibility of such a degradation by varying the chemical structures, either azoic (Congo Red (CR), Methyl Orange (MO), Ponceau G (PG), Orange II (OII), and Eriochrome Blue Black B (EB)), or anthraquinonic (Alizarin S (AS)), or heteropolyaromatic (Methylene Blue (MB)), or fluorescent (Neutral Red (NR), Rhodamine B (RB)), or sulfonic (Fuchsin Acid (FA)). The intermediates and the final products of degradation were detected by electrospray mass spectrometer (ES-MS) and ion chromatography (IC). According to the experimental results, we proposed a possible mechanism of the photodegradation of dyes under visible-light irradiation in the aqueous system.
Photocatalysis, Anatase, Polyoxometalate, Nanoporous, Visible-light irradiation, Dye, Degradation
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【期刊论文】Controlled synthesis of LaPO4 and CePO4 nanorods/nanowires
吴庆银, Minhua Cao, Changwen Hu, , Qingyin Wu, Caixin Guo, Yanjuan Qi and EnboWang
Nanotechnology 16(2005)282-286,-0001,():
-1年11月30日
LaPO4 and CePO4 nanorods/nanowires with controlled aspect ratios have been successfully synthesized using a hydrothermal microemulsion method under mild conditions. It has been shown that the obtained LaPO4 has a monoclinic structure, while CePO4 exists in the hexagonal structure. Uniform nanorods/nanowires with diameters of 20-60nm and lengths ranging from several hundreds of nanometres to several micrometres were obtained. The aspect ratios of the obtained 1D nanostructures can be fine-tuned by simply changing the [H2O]/[surfactant] molar ratios. The possible growth mechanism of LaPO4 and CePO4 nanorods/nanowires was explored in detail.
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【期刊论文】Assembling of tungstovanadogermanic heteropoly acid into mesoporous molecular sieve SBA-15
吴庆银, Hongxiao Jin a, Qingyin Wu a, *, Ping Zhang b, Wenqin Pang a, b
Solid State Sciences 7(2005)333-337,-0001,():
-1年11月30日
Heteropoly acid of Keggin structure tungstovanadogermanic (H5GeW11VO40) has been chemically anchored to the modified SBA-15 surface. The material was characterized by solid-state 29Si MAS NMR, FT-IR spectroscopy, XRD, TG-DTA and N2 adsorption experiments. The preservation of the structure of the HPA and dispersion of the cluster on the support were verified. On the bases of the spectroscopic evidences, HPA clusters were attached firmly to the surface.
Mesostructured silica, Heteropoly acid, SBA-15, Modification, Tungstovanadogermanic
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