The Transformation of Two-Line Ferrihydrite into Crystalline Products: Effect of pH and Media (Sulfate versus Nitrate)
The Transformation of Two-Line Ferrihydrite into Crystalline Products: Effect of pH and Media (Sulfate versus Nitrate)
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双线水铁矿向结晶产品的转化：pH 值和介质的影响（硫酸盐与硝酸盐）
DOI：
10.1021/acsearthspacechem.8b00001
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发表时间：
2018-03
影响因子：
3.4
通讯作者：
Jia Yongfeng
中科院分区：
文献类型：
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作者：
Zhang Danni;Wang Shaofeng;Wang Ying;Gomez Mario A;Duan Yihang;Jia Yongfeng
双线水合铁（Fh）普遍存在于土壤、地下水和水生沉积物中，由于其高表面积和反应活性，可能作为吸附/共沉淀的重要汇，通过吸附/共沉淀的方式吸收微量金属、类金属和有机物。尽管人们对这种热力学亚稳固体的转变过程给予了相当大的关注，但对两线Fh在硫酸盐和富钙环境中的转变产物、结晶速率或转变途径知之甚少。本研究系统地研究了在不同ph值（4和8）、温度（25°C、40°C和80°C）和介质（硫酸盐和硝酸盐）下，使用不同中和剂（CaO vs NaOH）产生的二线水合铁的转化。采用x射线衍射、拉曼光谱、傅里叶变换红外光谱和化学萃取对转化固体进行表征，并对2线Fh的结晶速率进行了表征。结果表明：结晶…
Two-line ferrihydrite (Fh), ubiquitous in soils, groundwater, and aquatic sediments, may serve as an important sink for sequestering trace metals, metalloids, and organic matter via adsorption/coprecipitation due to its high surface area and reactivity. Although considerable attention has been paid to the transformation process of this thermodynamically metastable solid, little is known about the transformation products, the crystallization rates, or the transformation routes of two-line Fh in sulfate- and calcium-rich environments. This work systematically investigates the transformation of 2-line ferrihydrite produced by using different neutralization reagents (CaO vs NaOH) at different pHs (4 and 8), temperatures (25 °C, 40 °C, and 80 °C), and media (sulfate vs nitrate). X-ray diffraction, Raman, Fourier transform infrared spectroscopy, and chemical extraction were employed to characterize the transformed solids as well as the crystallization rate of 2-line Fh. The results show that the crystallization...