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Pei L.Z.,Institute of Molecular Engineering and Applied Chemistry | Zhao H.S.,Institute of Molecular Engineering and Applied Chemistry | Tan W.,Henkel AG | Yu H.Y.,Institute of Molecular Engineering and Applied Chemistry | And 5 more authors.
Materials Research Bulletin | Year: 2010

Ge nanowires have been prepared at a low temperature by a simple hydrothermal deposition process using Ge and GeO2 powders as the starting materials. These as-prepared Ge nanowires are single crystalline with the diameter ranging from 150 nm to 600 nm and length of several dozens of micrometers. The photoluminescence spectrum under excitation at 330 nm shows a strong blue light emission at 441 nm. The results of the pressure and GeO2 content dependences on the formation and growth of Ge nanowires show that the hydrothermal pressure and GeO2 content play an essential role on the formation and growth of Ge nanowires under hydrothermal deposition conditions. The growth of Ge nanowires is proposed as a solid state growth mechanism. © 2009 Elsevier Ltd. All rights reserved.


Chen J.,Institute of Molecular Engineering and Applied Chemistry | Hong X.,Institute of Molecular Engineering and Applied Chemistry | Xie Q.,Institute of Molecular Engineering and Applied Chemistry | Li D.,Anhui University of Technology | Zhang Q.,Institute of Molecular Engineering and Applied Chemistry
Journal of Chemical and Engineering Data | Year: 2014

Polypyrrole-sepiolite nanofibers were prepared by in situ chemical oxidation polymerization in the presence of sepiolite. The nanostructure of PPy-sepiolite nanofibers was confirmed by field-emission scanning electron microscopy. The adsorption of Cr(VI) onto the PPy-sepiolite nanofibers was highly pH dependent and the adsorption kinetics followed the pseudo-second-order model. The Langmuir isothermal model well described the adsorption isotherm data and the maximum adsorption capacity increased with the increase of temperature. The maximum adsorption capacity of the PPy-sepiolite nanofibers for Cr(VI) was up to 302 mg·g-1 at 25 °C. Thermodynamic investigation indicated that the adsorption process is spontaneous and endothermic. Desorption experiment showed PPy-sepiolite can be regenerated and reused for four consecutive cycles without obvious loss of its removal efficiency. The excellent adsorption characteristic of PPy-sepiolite will render it a highly efficient and economically viable adsorbent for Cr(VI) removal. © 2014 American Chemical Society.


Pei L.Z.,Institute of Molecular Engineering and Applied Chemistry | Zhao H.S.,Institute of Molecular Engineering and Applied Chemistry | Tan W.,Henkel AG | Yu H.Y.,Institute of Molecular Engineering and Applied Chemistry | And 3 more authors.
Physica E: Low-Dimensional Systems and Nanostructures | Year: 2010

ZnO nanorods were prepared via a simple hydrothermal oxidization process on zinc substrate. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectrum (EDS), transmission electron microscopy (TEM) and photoluminescence (PL) spectrum were used to characterize the nanorods. The nanorods are single crystalline wurtzite structure with a length longer than 10 μm. The effects of the hydrothermal temperature, pressure and time on the morphology, diameter and length of the ZnO nanorods have been also analyzed. It is considered that time keeping the temperature and pressure is the main factor that influences the length of the ZnO nanorods. The PL spectrum shows a strong blue light emission at 439 nm, which is considered to be caused by radiative recombination of photo-generated holes with singularly ionized oxygen vacancies. The growth process of the ZnO nanorods is proposed based on the solid-liquid-solid (SLS) mechanism. © 2009 Elsevier B.V. All rights reserved.

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