Zhi-Jian Chen

National Huaqiao University, Xiamen, Fujian, China

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Publications (8)15.09 Total impact

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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 (~200 m2 g−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.
    Journal of Porous Materials 01/2011; 18(2):185-193. · 1.35 Impact Factor
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    ABSTRACT: SnO2–hexaniobate layered nanocomposite was prepared via an exfoliation–restacking route and characterized by powder X-ray diffraction, scanning electron microscope, thermogravimetric analysis, IR, UV–vis, X-ray photoelectron spectroscopy, specific surface area and porosity measurements. It was shown that the host layer structure remains unchanged after the exfoliation and restacking processes, and that the nanocomposite has an interlayer expansion of about 2.8nm even after calcination at 250°C for 2h. The nanocomposite is mesoporous with a high specific surface area (more than 120 m2/g). It was revealed the nanocomposite demonstrates a high photocatalytic activity in the degradation of acid red G under UV-light irradiation, which can be ascribed to its high surface area, mesoporosity and the synergistic effect of the two components.
    Microporous and Mesoporous Materials - MICROPOROUS MESOPOROUS MAT. 01/2010; 130(1):344-351.
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    ABSTRACT: Mesoporous α-Fe2O3-pillared titanate nanocomposites have been successfully synthesized through an exfoliation−restacking route. Powder X-ray diffraction and N2 adsorption–desorption isotherms revealed that the α-Fe2O3 pillared titanate has an interlayer distance of 3.27nm, a specific surface area of 66m2/g and an average pore size of 7.6nm, suggesting the formation of a mesoporous pillared structure. UV–vis diffuse reflectance spectra show a red shift, indicative of a narrow band gap energy of ∼2.1eV compared to the host layered titanate, which is essential in creating a visible light photocatalytic activity. The results of degradation of rhodamine B reveal that the present pillared mesoporous composites exhibit better photocatalytic activities than those of the pristine materials under visible irradiation, based on the band gap excitement and the dye-sensitized path, originated from their high surface area, mesoporosity and the electronic coupling between the host and the guest components.
    Journal of Physics and Chemistry of Solids 01/2010; 71(5):841-847. · 1.53 Impact Factor
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    ABSTRACT: A porous SnO2-pillared HTaWO6 nanocomposite was assembled from tantalotungstate nanosheets and SnO2 nanoparticles via an exfoliation–restacking route and characterized by powder X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, UV-vis, X-ray photoelectron spectroscopy and N2 adsorption–desorption measurements. It was revealed that the obtained material has a gallery height of about 2 nm, a specific surface area of about 80 m2 g−1 and a wide pore size distribution with two extrema at about 2 and 3 nm. The mesoporous material exhibits enhanced photocatalytic activity in the degradation of MB, attributed to its high surface area, mesoporosity and the electronic coupling between the host and the guest components. A photoexcitation model of the semiconductor–semiconductor pillared photocatalyst was proposed based on the results of XPS and UV-vis.
    Journal of Materials Chemistry 01/2010; 20(19). · 5.97 Impact Factor
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    ABSTRACT: A new polyoxotungstate formed by Wells–Dawson clusters and copper(II) complexes, [{Cu(enMe)2(H2O)}{Cu(enMe)2}3P2W18O62] · nH2O (enMe = 1,2-diaminopropane, n = 0.81) has been synthesized under hydrothermal conditions. Single-crystal X-ray diffraction revealed that one terminal and three bridging oxygen atoms of the Wells–Dawson cluster in the title compound are coordinated to copper(II) atoms, and forming a unique tetrasupporting polyoxometalate structure. Its cyclic voltammetric behavior in aqueous electrolyte demonstrated that its modified carbon paste electrode has a good stability. It was exhibited that the compound has catalytic activity in epoxidation of maleic anhydride.
    Inorganica Chimica Acta. 05/2009; 362(7):2505–2509.
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    ABSTRACT: Utilizing the solvothermal synthesis technique, lithium intercalated molybdenum disulfide LixMoS2 was expediently obtained, which was allowed to react with water to the formation of single-molecule-layer suspension. The intercalation of polythiophene into MoS2 was achieved by means of in situ polymerization of the intercalated monomers. The nanocomposite was characterized by X-ray powder diffraction, thermogravimertic analysis and differential scanning calorimetry. It was revealed that the intercalated polymer chain favors the monolayer arrangement with the thiophene rings lying parallel with the host layers. The optimum conditions were explored to prepare the single-phase product with a composition of Li0.12(PTP)0.54MoS2. The nanocomposite exhibits enhanced electrical conductivity in the order of 10−2Scm−1 at ambient temperature, resulted from the incorporation of the electronically conductive polythiophene between the semiconducting host layers and the coupling between the guest conjugated π-orbits and the host layers.
    Materials Research Bulletin 01/2009; 44(4):719-723. · 1.97 Impact Factor
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    ABSTRACT: Lithium intercalated tungsten disulfide Li(x)WS(2) with x>1 was solvothermally obtained. It was revealed that Li(x)WS(2) can remain mostly unchanged under vacuum (about 4 kPa) for 5 days. The pH dependences of surface zeta potential for single molecular layers of WS(2) were determined, illustrating that its isoeletric point is approximately at pH 3. The polypyrrole/WS(2) layered nanocomposites were prepared via the combination of the exfoliation-restacking technique and in situ oxidative polymerization. The intercalation of PPy into the host galleries resulted in an interlayer expansion of about 3.7 A, which suggested that the intercalated polymeric chains are in a monolayer arrangement with the pyrrole rings lying parallel to the WS(2) host layers. The resulting material shows good thermal stability with the decomposition of the interacted chains within the disulfide galleries occurring at around 400 degrees C. The electrical conductivity of PPy/WS(2) nanocomposite was found to be high in the order of 10(-2) S cm(-1) at ambient temperature.
    Journal of Colloid and Interface Science 10/2008; 330(1):220-6. · 3.17 Impact Factor
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    ABSTRACT: Two new phosphatotungstates containing Keggin clusters, [Cu(2,2′-bipy)2]5[PW12O40] · 2H2O (1) (2,2′-bipy = 2,2′-bipyridine) and (Hpip)3[PW12O40] (2) (pip = piperazine) have been hydrothermally synthesized and characterized by IR, element analysis and cyclic voltammogram. Compound 1 consists of one discrete Keggin polyanion [PW12O40]5−, five isolated complex cations [Cu(2,2′-bipy)2]+ and two water molecules. The organic moieties exhibit regular packing with offset aromatic–aromatic interactions between the bipys, leading to a compact supramolecular framework structure. Compound 2 is made up of one discrete Keggin polyanion [PW12O40]3− and three pip cations. Compounds 1 and 2 were employed to fabricate bulk-modified carbon paste electrode to research on their electrochemistry properties. Their electrochemical behaviors and electrocatalysis that 1- and 2-CPEs have electrocatalytic activities toward the oxidation of nitrite. Compound 1 is in the orthorhombic system, space group Pna21, with a = 28.1928(9), b = 21.5479(6), c = 19.9088(6) Å, V = 12,094.5(6) Å3 and Z = 4. Compound 2 is in the rhombohedral system, space group R $ \overline{3} $ c, with a = 17.9191(5), c = 23.7439(9) Å, V = 6,602.6(4) Å3 and Z = 6.
    Journal of Cluster Science 19(4). · 1.11 Impact Factor