Investigation of radionuclide~(63)Ni(Ⅱ) sequestration mechanisms on mordenite by batch and EXAFS spectroscopy study

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	Investigation of radionuclide~(63)Ni(Ⅱ) sequestration mechanisms on mordenite by batch and EXAFS spectroscopy study
其他题名	Investigation of radionuclide~(63)Ni(Ⅱ) sequestration mechanisms on mordenite by batch and EXAFS spectroscopy study
	Yang Shitong 1; Sheng Guodong 1; Guo Zhiqiang 1; Tan Xiaoli 1; Xu Jinzhang 1; Wang Xiangke 1
	2012
发表期刊	中国科学. 化学
ISSN	1674-7291
摘要	The sorption behavior and microscopic sequestration mechanisms of radionuclide ~(63)Ni(II) on mordenite as a function of aging time,ionic strength,initial ~(63)Ni(Ⅱ) concentrations,solid content and coexistent electrolyte ions were investigated by the com-bination of batch and EXAFS techniques.Macroscopic experiment results show that the sorption of ~(63)Ni(Ⅱ) is dependent on ionic strength at pH 7.The sorption percentage of ~(63)Ni(Ⅱ) on mordenite increases with increasing solid content,while the sorption capacity decreases as solid content increases.The presence of different elec-trolyte ions can enhance or inhibit the sorption of Ni(II) on mordenite in various degrees.EXAFS analysis results of the sam-ples under three different ionic strengths suggest that the retained ~(63)Ni(Ⅱ) in these samples exists in an octahedral environment with six water ligands.In the initial period of rapid uptake,the sorption of ~(63)Ni(Ⅱ) is dominated by the formation of in-ner-sphere surface complexes.As aging time increases,~(63)Ni(Ⅱ) sequestration behavior tends to be mainly controlled by the formation of Ni phyllosilicate co-precipitates and/or Ni(OH)2(s) precipitates.Results for the second shell fit of the sample pre-pared at an initial ~(63)Ni(Ⅱ) concentration of 100 mg/L indicate the possible formation of Ni polynuclear surface complexes.Both the macroscopic sorption data and the molecular level evidence of ~(63)Ni(Ⅱ) surface speciation at the mordenite/water in-terfaces should be factored into better predictions of the mobility and bioavailability of ~(63)Ni(Ⅱ) in environment mediums.
其他摘要	The sorption behavior and microscopic sequestration mechanisms of radionuclide ~(63)Ni(II) on mordenite as a function of aging time,ionic strength,initial ~(63)Ni(Ⅱ) concentrations,solid content and coexistent electrolyte ions were investigated by the com-bination of batch and EXAFS techniques.Macroscopic experiment results show that the sorption of ~(63)Ni(Ⅱ) is dependent on ionic strength at pH 7.The sorption percentage of ~(63)Ni(Ⅱ) on mordenite increases with increasing solid content,while the sorption capacity decreases as solid content increases.The presence of different elec-trolyte ions can enhance or inhibit the sorption of Ni(II) on mordenite in various degrees.EXAFS analysis results of the sam-ples under three different ionic strengths suggest that the retained ~(63)Ni(Ⅱ) in these samples exists in an octahedral environment with six water ligands.In the initial period of rapid uptake,the sorption of ~(63)Ni(Ⅱ) is dominated by the formation of in-ner-sphere surface complexes.As aging time increases,~(63)Ni(Ⅱ) sequestration behavior tends to be mainly controlled by the formation of Ni phyllosilicate co-precipitates and/or Ni(OH)2(s) precipitates.Results for the second shell fit of the sample pre-pared at an initial ~(63)Ni(Ⅱ) concentration of 100 mg/L indicate the possible formation of Ni polynuclear surface complexes.Both the macroscopic sorption data and the molecular level evidence of ~(63)Ni(Ⅱ) surface speciation at the mordenite/water in-terfaces should be factored into better predictions of the mobility and bioavailability of ~(63)Ni(Ⅱ) in environment mediums.
关键词	mordenite ~(63)Ni(Ⅱ) aging time initial concentration EXAFS analysis
收录类别	CSCD
语种	中文
CSCD记录号	CSCD:4537975
引用统计
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/55261
专题	中国科学院合肥物质科学研究院
作者单位	1.Institute of Plasma Physics, Chinese Academy of Sciences 2.Institute of Plasma Physics, Chinese Academy of Sciences 3.Institute of Plasma Physics, Chinese Academy of Sciences 4.Institute of Plasma Physics, Chinese Academy of Sciences 5.Institute of Plasma Physics, Chinese Academy of Sciences 6.Institute of Plasma Physics, Chinese Academy of Sciences
推荐引用方式 GB/T 7714	Yang Shitong,Sheng Guodong,Guo Zhiqiang,et al. Investigation of radionuclide~(63)Ni(Ⅱ) sequestration mechanisms on mordenite by batch and EXAFS spectroscopy study[J]. 中国科学. 化学,2012,55.
APA	Yang Shitong,Sheng Guodong,Guo Zhiqiang,Tan Xiaoli,Xu Jinzhang,&Wang Xiangke.(2012).Investigation of radionuclide~(63)Ni(Ⅱ) sequestration mechanisms on mordenite by batch and EXAFS spectroscopy study.中国科学. 化学,55.
MLA	Yang Shitong,et al."Investigation of radionuclide~(63)Ni(Ⅱ) sequestration mechanisms on mordenite by batch and EXAFS spectroscopy study".中国科学. 化学 55(2012).