铁的氢氧化合物稳定相α, β-FeOOH的表征及光谱分析

徐轶群; 杨明; 何成达; 熊慧欣

doi:doi:10.3964/j.issn.1000-0593(2013)12-3330-04

光谱学与光谱分析, 2013, 33 (12): 3330, 网络出版: 2014-01-09

铁的氢氧化合物稳定相α, β-FeOOH的表征及光谱分析

Characterization and Spectral Analysis of the Stable Mineral Phases α,β-FeOOH Included in Iron Oxyhydroxides

论文大纲

徐轶群 ^*杨明何成达熊慧欣

作者单位

扬州大学环境科学与环境工程学院, 江苏扬州 225127

铁的氢氧化合物针铁矿四方纤铁矿光谱分析 Iron oxyhydroxides Goethite Akaganéite Spectral analysis

摘要

铁的氢氧化合物稳定相针铁矿(α-FeOOH)及四方纤铁矿(β-FeOOH)的合成材料因具有纳米颗粒粒径、较高比表面积, 在工业生产和环境治理中被广泛应用。 α,β-FeOOH作为重金属等污染物的吸附材料尤受关注。但其合成过程中溶液pH值和反应条件(如不同温度下加热或室温磁力搅拌等)对α,β-FeOOH矿物材料晶型、颗粒形貌、尺寸和界面特性的影响及其与矿物环境功能的相关性报道较少。故本工作基于Fe(NO3)3和FeCl3溶液在一定pH值范围内分别易于形成α-FeOOH和β-FeOOH稳定相, 利用X射线衍射仪、透射/扫描电子显微镜和激光粒度分析仪对加热(40和70 ℃)和磁力搅拌(25 ℃)条件下形成的矿物α, β-FeOOH的晶型和颗粒形貌结构进行了鉴定与表征, 同时利用红外光谱仪测定了矿物表面的特征结构基团。研究结果表明, 40和70 ℃反应温度下形成的矿物Aka-T40, Aka-T70, Gth-T70具有颗粒均一、结晶型较好、比表面积较大等特性, 是良好的去除环境污染物的吸附剂材料。

Abstract

In the present work, based on the stable phase of α-FeOOH and β-FeOOH easily formed in ferric solutions of Fe(NO3)3 and FeCl3 at the appropriate pH values, respectively, the phase and crystallizability, morphologies and sizes for the particles of FeOOH minerals prepared under the conditions of heating at 40 and 70 ℃, and magnetic stirring at 25 ℃ were identified and examined by X-ray diffraction (XRD), transmission/scanning electron microscopy (TEM/SEM) and laser scattering particle analyzer. Meanwhile the surface chemistry properties were also detected and analyzed by Fourier transform infrared spectrometer (FTIR). Investigation results showed that the prepared minerals Gth-T70 (α-FeOOH), Aka-T40 and Aka-T70 (β-FeOOH) have good properties of nanocrystallity, homogeneous particles and higher specific surface areas, which induced that the above α, β-FeOOH are potentially excellent adsorbent materials for removal of some contaminants in circumstances.

参考文献

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徐轶群, 杨明, 何成达, 熊慧欣. 铁的氢氧化合物稳定相α, β-FeOOH的表征及光谱分析[J]. 光谱学与光谱分析, 2013, 33(12): 3330. XU Yi-qun, YANG Ming, HE Cheng-da, XIONG Hui-xin. Characterization and Spectral Analysis of the Stable Mineral Phases α,β-FeOOH Included in Iron Oxyhydroxides[J]. Spectroscopy and Spectral Analysis, 2013, 33(12): 3330.

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