Palmer Sara J, Reddy B Jagannadha, Frost Ray L
School of Physical and Chemical Sciences, Queensland University of Technology, Brisbane, Queensland 4001, Australia.
Spectrochim Acta A Mol Biomol Spectrosc. 2009 Jan;71(5):1814-8. doi: 10.1016/j.saa.2008.06.038. Epub 2008 Jul 9.
The characterisation of red mud has been studied by diffuse reflectance spectroscopy in the UV-vis-NIR region (DRS). For the first time the ferric ion responsible for the bands has been identified from electronic spectroscopy. It contains valuable amounts of oxidised iron (Fe(3+)) and aluminium hydroxide. The NIR peak at around 11,630 cm(-1) (860 nm) with a split of two components and a pair of sharp bands near 500 nm (20000 cm(-1)) in the visible spectrum are attributed to Fe(3+) ion in distorted sixfold coordinations. The observation of identical spectral patterns (both electronic and vibrational spectra) of red mud before and after seawater neutralisation (SWN) confirmed that there is no effect of seawater neutralisation on structural cation substitutions such as Al(3+), Fe(3+), Fe(2+), Ti(3+), etc.
利用紫外-可见-近红外区域的漫反射光谱（DRS）对赤泥进行了表征研究。首次通过电子光谱鉴定了产生这些谱带的铁离子。它含有大量的氧化铁（Fe(3+)）和氢氧化铝。近红外区域约11,630 cm(-1)（860 nm）处的峰以及可见光谱中500 nm（20000 cm(-1)）附近的一对尖锐谱带，分裂为两个成分，这归因于处于扭曲六重配位的Fe(3+)离子。海水中和（SWN）前后赤泥相同光谱模式（电子光谱和振动光谱）的观察结果证实，海水中和对诸如Al(3+)、Fe(3+)、Fe(2+)、Ti(3+)等结构阳离子取代没有影响。
