期刊
JOURNAL OF MOLECULAR LIQUIDS
卷 236, 期 -, 页码 445-451出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molliq.2017.04.046
关键词
Al-substituted goethite; Eu(III); Adsorption mechanism; XPS analysis
资金
- National Natural Science Foundation of China [41402030, 41402029, 41572029]
Europium (Eu(III)) has been extensively used as an analogue of trivalent lanthanide in the radioactive wastewater from nuclear industry. The adsorption of Eu(III) on the Al-substituted goethite was investigated by characteristic and batch techniques. The characteristic results illustrated that the Al-substituted goethite was synthesized successfully and the acicular-like structure goethite was transformed to multi-domain jagged crystal with the increase of Al content, respectively. The adsorption amount of Eu(III) on Al-substituted goethite was increased with an increase of pH from 4.0 to 8.0. The thermodynamic parameters revealed that the adsorption of Eu(III) on Al substituted goethite was a spontaneous and endothermic process. The increase of Al content increased the adsorption capacity of Al-substituted goethite to Eu(III). The maximum Eu(III) adsorption capacity was determined to be 6.75 mg/g for alpha-(Fe0.85Al0.15)OOH at pH = 5.5 and T = 293 K using Langmuir model. Furthermore, XPS (Xray photoelectron spectroscopy) analysis verified that oxygen-containing functional groups were responsible for the major adsorption mechanism and the effect.of ionic strength on the adsorption displayed the inner-sphere surface complexation of Al-substituted goethite dominated the adsorption process. (C) 2017 Elsevier B.V. All rights reserved.
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