The mineral tooeleite Fe₆(AsO₃)₄SO₄(OH)₄⋅4H₂O - an infrared and Raman spectroscopic study-environmental implications for arsenic remediation.
The mineral tooeleite Fe₆(AsO₃)₄SO₄(OH)₄⋅4H₂O - an infrared and Raman spectroscopic study-environmental implications for arsenic remediation.
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DOI：
10.1016/j.saa.2012.11.016
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发表时间：
2013-02
期刊：
影响因子：
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通讯作者：
Jing Liu;Hongfei Cheng;R. Frost;F. Dong
中科院分区：
文献类型：
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作者：
Jing Liu;Hongfei Cheng;R. Frost;F. Dong
矿物tooeleite Fe 6（AsO 3）4SO 4（OH）4·4 H2O是次生亚砷酸铁硫酸盐矿物，由于其在风化层中的高稳定性，对于砷修复具有环境意义。用X射线衍射（XRD）、红外光谱（IR）和拉曼光谱（Raman）对该矿物进行了研究。XRD结果表明，在酸性环境中，铁锰矿比在碱性环境中能形成更多的结晶固体。红外光谱在773 cm − 1处识别出中等强度的谱带，归属于AsO 33对称伸缩振动。拉曼光谱在803、758和661 cm-1处识别出三个谱带，分别归属于AsO 33-和As-OH伸缩振动的对称和反对称伸缩振动。此外，在1116、1040、1090、981和616 cm −1处观察到的红外谱带被归属于SO 42-的ν3、ν 1和ν 4模。在拉曼光谱中，在1287、1085、983和604 cm − 1处观察到相同的谱带。XPS中结合能为44.05eV的As 3d带证实了砷的价态为+3。红外和拉曼光谱中的这些特征谱带，为矿物的鉴定提供了有用的依据。
The mineral tooeleite Fe6(AsO3)4SO4(OH)4⋅4H2O is secondary ferric arsenite sulphate mineral which has environmental significance for arsenic remediation because of its high stability in the regolith. The mineral has been studied by X-ray diffraction (XRD), infrared (IR) and Raman spectroscopy. The XRD result indicates tooeleite can form more crystalline solids in an acid environment than in an alkaline environment. Infrared spectroscopy identifies moderately intense band at 773cm−1assigned to AsO33-symmetric stretching vibration. Raman spectroscopy identifies three bands at 803, 758 and 661cm−1assigned to the symmetric and antisymmetric stretching vibrations of AsO33-and As-OH stretching vibration respectively. In addition, the infrared bands observed at 1116, 1040, 1090, 981 and 616cm−1, are assigned to the ν3, ν1and ν4modes of SO42-. The same bands are observed at 1287, 1085, 983 and 604cm−1in the Raman spectrum. As3dband at binding energy of 44.05eV in XPS confirms arsenic valence of tooeleite is +3. These characteristic bands in the IR and Raman spectra provide useful basis for identifying the mineral tooeleite.