Sorption behaviors of uranium (VI) ions on α-FeOOH
Sorption behaviors of uranium (VI) ions on α-FeOOH
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DOI：
10.1016/j.desal.2010.10.042
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发表时间：
2011-03
期刊：
影响因子：
9.9
通讯作者：
S. Yusan;S. Erenturk
中科院分区：
文献类型：
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作者：
S. Yusan;S. Erenturk
本研究的目的是在各种条件下，从水溶液中去除六价铀的合成针铁矿吸附剂的能力的检查。在实验室合成了针铁矿（α-FeOOH），它对铀酰（UO_（22+））离子具有很强的吸附能力。通过观察pH值、温度、吸附质浓度、接触时间等因素的影响进行了批量研究。吸附剂采用了Langmuir、Freundlich和Dubininin-Radushkevich等多种吸附等温线模型。在针铁矿上的吸附已被发现是吸热的，在自然界中是可行的。各种热力学参数，如吉布斯的自由能，熵和焓的吸附过程中，已计算。此外，Lagergren一级，伪二级和颗粒内扩散模型被用来描述动力学数据。实验数据符合准二级动力学。产物材料通过用于晶相鉴定的粉末X射线衍射、扫描电子显微镜（SEM）和多点Brunauer、Emmett和Teller（BET）表征。
The objective of this study was the examination of the ability of a synthetic goethite nanocrystal to remove hexavalent uranium from aqueous solutions under various conditions. Goethite (α-FeOOH), which has a strong affinity for adsorption of the uranyl (UO22+) ion, was synthesized in the laboratory and used as adsorbent. Batch studies have been carried by observing the effects of pH, temperature, concentration of the adsorbate, contact time, etc. Various sorption isotherm models like, Langmuir, Freundlich and Dubinin–Radushkevich have been carried out for the adsorbent. The sorption on the goethite has been found endothermic and feasible in nature. Various thermodynamic parameters, such as Gibb's free energy, entropy and enthalpy of sorption process, have been calculated. Furthermore, the Lagergren first-order, pseudo-second-order and the intraparticle diffusion models were used to describe the kinetic data. The experimental data fitted well the pseudo-second-order kinetics. The product material was characterized by powder X-ray diffraction for crystalline phase identification, scanning electron microscope (SEM) and multi point Brunauer, Emmett and Teller (BET).