School of Resources & Environmental Engineering, Hefei University of Technology, China; School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, Australia.
Spectrochim Acta A Mol Biomol Spectrosc. 2013 Dec;116:154-9. doi: 10.1016/j.saa.2013.06.102. Epub 2013 Jul 5.
Transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM/EDS) and X-ray diffraction (XRD) were used to characterize the morphology of synthetic goethite. The behavior of the hydroxyl/water molecular units of goethite and its thermally treated products were characterized using Fourier transform-infrared emission spectroscopy (FT-IES) and attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy. The results showed that all the expected vibrational bands between 4000 and 650 cm(-1) including the resolved bands (3800-2200 cm(-1)) were confirmed. A band attributed to a new type of hydroxyl unit was found at 3708 cm(-1) and assigned to the FeO-H stretching vibration without hydrogen bonding. This hydroxyl unit was retained up to the thermal treatment temperature of 500 °C. On the whole, seven kinds of hydroxyl units, involving three surface hydroxyls, a bulk hydroxyl, a FeO-H without hydrogen bonding, a nonstoichiometric hydroxyl and a reversed hydroxyl were observed, and three kinds of adsorbed water were found in/on goethite.
采用透射电子显微镜（TEM）、场发射扫描电子显微镜（FE-SEM/EDS）和 X 射线衍射（XRD）对合成针铁矿的形貌进行了表征。采用傅里叶变换红外发射光谱（FT-IES）和衰减全反射傅里叶变换红外（ATR-FTIR）光谱对针铁矿及其热处理产物的羟基/水分子单元的行为进行了表征。结果表明，在 4000-650 cm(-1) 之间确认了所有预期的振动带，包括分辨带（3800-2200 cm(-1))。在 3708 cm(-1) 处发现了一个归因于新型羟基单元的带，被分配到没有氢键的 FeO-H 伸缩振动。该羟基单元在 500°C 的热处理温度下得以保留。总的来说，观察到了七种羟基单元，包括三个表面羟基、一个体相羟基、一个没有氢键的 FeO-H、一个非化学计量羟基和一个反向羟基，并在针铁矿中发现了三种吸附水。
