期刊
RADIATION PHYSICS AND CHEMISTRY
卷 103, 期 -, 页码 222-226出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.radphyschem.2014.06.004
关键词
Calix[4]arene-R14; Macroporous silica-based support; Cesium; Adsorption; Radioactive waste; gamma-Ray irradiation
资金
- National Natural Science Foundation of China [21261140335, 91126006]
- Scientific Research Foundation for Youth Scholars of Shanghai Jiao Tong University [AF0200003]
1,3-[(2,4-Diethylheptylethoxy)oxy]-2,4-crown-6-Calix[4]arene(Calix[4]arene-R14), used as an extractant of Cs(I) from nitric acid, modified by dodecanol and dodecyl benzenesulfonic acid (DBS), was loaded into the pores of macroporous silica-based polymer support (SiO2-P) particles. To evaluate the stability of the adsorbent, the adsorption data at different temperatures (298-323 K) and gamma-ray absorbed doses (10-200 kGy) were analyzed by the Langmuir isotherm. The minimum adsorbed amount was calculated to be 0.121 mmol g(-1) at 323 K, approximately 23% reduction compared to 298 K. The maximum adsorbed amount of not-irradiated adsorbent with 0.156 mmol g(-1) decreased by 20% than that irradiated in 0.5 M HNO3. The thermodynamic parameters have revealed that this adsorption reaction is an exothermic and spontaneous process. The reduction in 3 M HNO3 was about 45% by the comparison between the before- and after-irradiation. It was found that both the concentrations of HNO3 and DBS have significant influence on the degradation of the adsorbents. (C) 2014 Elsevier Ltd. All rights reserved.
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