期刊
SCIENCE IN CHINA SERIES B-CHEMISTRY
卷 52, 期 3, 页码 362-371出版社
SCIENCE PRESS
DOI: 10.1007/s11426-008-0145-x
关键词
MX-80 bentonite; radionickel; acid-based titration; sorption; modeling
资金
- National Natural Science Foundation of China [20501019, J0630962]
- 973 Projects [2007CB936602]
MX-80 bentonite was detected using acid-based titration, XRD and FTIR in detail. The sorption behavior of Ni-63(II) from aqueous solution to MX-80 bentonite was investigated as a function of solid content, ionic strength and pH by using batch technique. The experimental data of Ni-63(II) sorption on MX-80 bentonite was obtained using the diffuse layer model (DLM) with the aid of FITEQL 3.1 program. The results indicated that the sorption of Ni-63(II) on MX-80 bentonite was mainly dominated by surface complexation, and cation exchange also contributed partly to Ni-63(II) sorption at low pH values. The sorption isotherms were simulated by Langmuir and Freundlich models, and the results indicated that Freundlich isotherm model fitted the sorption data better than the Langmuir isotherm model. The results are crucial to evaluate the sorption and migration of radionickel in MX-80 bentonite.
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