The Key Laboratory of Superlight Materials and Surface Technology

Harbin, China

The Key Laboratory of Superlight Materials and Surface Technology

Harbin, China

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Hu S.,The Key Laboratory of Superlight Materials and Surface Technology | Hu S.,Harbin Engineering University | Ren B.,The Key Laboratory of Superlight Materials and Surface Technology | Wang J.,The Key Laboratory of Superlight Materials and Surface Technology | And 2 more authors.
Powder Technology | Year: 2013

Mesoporous TiO2/ZrO2 nanocomposition was prepared by sol-gel method with Pluronic P123 and Macrogol 20000 as double templates. The structures and physicochemical properties of the composite were characterized by small-angle and wide-angle powder X-ray diffraction (XRD), Raman scattering studies, N2 adsorption-desorption. The photocatalytic efficiencies of the products were assessed by monitoring the photodegradation of Rhodamine B (RhB).Compared with the samples prepared by single-template, the pore size of the sample prepared by double templates was larger, and their pore volume was increased. Furthermore, the employment of double templates retarded the crystal phase transformation from anatase-TiO2 to rutile-TiO2, and the obtained mesoporous composite showed high thermal stability. The photocatalytic reactions confirmed that the sample prepared by double templates (the concentration of RhB was 8.37%), showed higher photocatalytic activity than the sample prepared by single template (the concentrations of RhB were 10.31% and 8.96%, respectively). © 2012 Elsevier B.V.


Wang J.,Harbin Engineering University | Wang J.,The Key Laboratory of Superlight Materials and Surface Technology | Zhou J.,Harbin Engineering University | Zhou J.,The Key Laboratory of Superlight Materials and Surface Technology | And 10 more authors.
Materials Research Bulletin | Year: 2010

We describe a novel route for the preparation of magnetic and fluorescent magnesium-aluminum layered double hydroxides by introducing Fe3O4 nanoparticles and Eu3+ ions. From the powder X-ray diffraction results, it was found that the Fe3O4 nanoparticles were highly dispersed in the inner void of octahedral lattice, and the Eu3+ ions substituted for the Al3+ ions and entered into hydrotalcite lattice through isomorphous replacement. Moderate introduction of Fe3O4 nanoparticles and Eu3+ ions did not change the lamellar structure of magnesium-aluminum layered double hydroxides. Glycine can also be intercalated into this magnetic and fluorescent layered double hydroxides by ion-exchange method. After intercalation of glycine, the basal spacing of magnetic and fluorescent layered double hydroxides increased from 7.6 to 8.8 Å, indicating that glycine was successfully intercalated into the interlayer space of layered double hydroxides. Magnetic measurements reveal that these novel layered double hydroxides possess paramagnetic property at room temperature, and the emission and excitation spectra indicate the layered double hydroxides exhibit fluorescent property. © 2010 Elsevier Ltd. All rights reserved.


Li S.,Harbin Engineering University | Li S.,The Key Laboratory of Superlight Materials and Surface Technology | Bai H.,Harbin Engineering University | Wang J.,Harbin Engineering University | And 10 more authors.
Chemical Engineering Journal | Year: 2012

This paper report on the efficient removal of uranium ions from aqueous solution with a novel magnetic composite adsorbent, calcined magnetic layered double hydroxide/hydroxyapatite (CMLH). This adsorbent was obtained via in situ grown of nano-hydroxyapatite on magnetic CaAl-layered double hydroxides and followed with calcining. The morphology and microstructure of the as-prepared adsorbents were characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) spectroscopy. The influences of conditions for uranium removal, including dosage of LDHs, pH of aqueous solution, and temperature on anion-exchange have been investigated, respectively. The thermodynamic parameters including Gibbs free energy (ΔG 0), standard enthalpy change (ΔH 0) and standard entropy change (ΔS 0) for the process were calculated using the Langmuir constants. It was found from kinetics test that the pseudo-second order kinetics model could be used to well describe the uptake process. Furthermore, the CMLH could be regenerated through the desorption of the uranium using 0.5M NaHCO 3 solution and could be reused to adsorb after calcination. © 2012 Elsevier B.V.

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