Ren L.-R.,Shanxi Institute of Coal CAS Chemistry |
Ren L.-R.,University of Chinese Academy of Sciences |
Ren L.-R.,National Engineeing Laboratory for Indirect Coal Liquefaction |
Yan L.,Synfuels China Co. |
And 11 more authors.
Chinese Journal of Inorganic Chemistry | Year: 2012
Goethite (a-FeOOH) nanorods with uniform sizes were successfully prepared by hydrothermal method in alkaline solutions at 120 °C. The effects of Mn-dopant on the phase structure and morphology were investigated systematically using X-ray diffraction (XRD), mossbauer spectroscopy (MES), fourier transform infrared spectroscopy (FTIR), field-emision scanning electron microscopy (FE-SEM), and high-resolution transmission electron microscope (HRTEM). It was found that the concentration of Mn2+ ion plays an important role in modulating the morphology and phase structure of a-FeOOH. The aspect ratio of nanorods increases with Mn ion concentration increasing. When the atomic ratio of Mn ion and Fe ion (nMn(II)/nFe(III)) is 0.30, the α-(Fe,Mn) OOH and MnFe2O4 mixture was formed with the morphology of irregular nanorods and nanoparticles.