期刊
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
卷 103, 期 1, 页码 20-29出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jenvrad.2011.08.010
关键词
Hematite; U(VI); Sorption; Humic acid; Fulvic acid
资金
- National Natural Science Foundation of China [21001002, 20907055, 21071147, 20971126]
- 973 project [2011CB933700]
- CAS
- Special Foundation for High-level Waste Disposal [2007-840]
In this study, the sorption of U(VI) from aqueous solution on hematite was studied as a function of various water quality parameters such as contact time, pH, ionic strength, soil humic acid (HA) or fulvic acid (FA), solid content and temperature by using a batch technique. The results demonstrated that the sorption of U(VI) was strongly dependent on ionic strength at pH < 6.0, and outer-sphere surface complexation may be the main sorption mechanism. The sorption was independent of ionic strength at pH > 6.0 and the sorption was mainly dominated by inner-sphere surface complexation. The presence of HA/FA increases U(V1) sorption at low pH, whereas decreases U(VI) sorption at high pH. The thermodynamic parameters (Delta H-0, Delta S-0, and Delta G(0)) were calculated from the temperature dependent sorption isotherms, and the results suggested that U(VI) sorption was a spontaneous and endothermic process. The results might be important for the application of hematite in U(VI) pollution management. (C) 2011 Elsevier Ltd. All rights reserved.
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