期刊
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
卷 295, 期 2, 页码 1473-1485出版社
SPRINGER
DOI: 10.1007/s10967-012-1934-4
关键词
Illite; Sorption; Co-60(II); Humic substances; Thermodynamic
资金
- National Natural Science Foundation of China [51054003, 50374045]
- National Natural Science Foundation of Shandong Province [Y2007F60]
- High Education Science Technology Program of Shandong Province [J09LB59]
- Sponsored Research Foundation for Young Scientist of Shandong Province [BS2009NJ007]
In this work, a naturally occurring illite was characterized by using FT-IR and XRD technique to determine its surface functional groups and crystal structure. Sorption of Co-60(II) on illite as a function of contact time, pH, ionic strength, foreign ions, humic substances and temperature was studied under ambient condition using batch technique. The results indicated that the sorption of Co-60(II) on illite is strongly affected by pH values (2-9) and ionic strength. A positive effect of humic substances on Co-60(II) sorption was found at pH < 7.0, whereas a negative effect was observed at pH > 7.0. At low pH, the sorption of Co-60(II) was dominated by outer-sphere surface complexation and ion exchange with Na+/H+ on illite surfaces, whereas inner-sphere surface complexation was the main sorption mechanism at high pH. The Langmuir and Freundlich models were used to simulate the sorption isotherms of Co-60(II) at three different temperatures of 298.15, 323.15 and 343.15 K. The thermodynamic parameters (Delta H (0), Delta S (0) and Delta G (0)) calculated from the temperature dependent sorption isotherms indicated that the sorption process of Co-60(II) on illite was endothermic and spontaneous.
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