Investigation of radionuclide Ni-63(II) sequestration mechanisms on mordenite by batch and EXAFS spectroscopy study
文献类型：期刊论文
| 作者 | Yang, ST ; Sheng, GD ; Guo, ZQ ; Tan, XL ; Xu, JZ ; Wang, XK |
| 刊名 | science china-chemistry
 |
| 出版日期 | 2012 |
| 中文摘要 | the sorption behavior and microscopic sequestration mechanisms of radionuclide ni-63(ii) on mordenite as a function of aging time, ionic strength, initial ni-63(ii) concentrations, solid content and coexistent electrolyte ions were investigated by the combination of batch and exafs techniques. macroscopic experiment results show that the sorption of ni-63(ii) is dependent on ionic strength at ph<7, and independent of ionic strength at ph>7. the sorption percentage of ni-63(ii) on mordenite increases with increasing solid content, while the sorption capacity decreases as solid content increases. the presence of different electrolyte ions can enhance or inhibit the sorption of ni(ii) on mordenite in various degrees. exafs analysis results of the samples under three different ionic strengths suggest that the retained ni-63(ii) in these samples exists in an octahedral environment with six water ligands. in the initial period of rapid uptake, the sorption of ni-63(ii) is dominated by the formation of inner-sphere surface complexes. as aging time increases, ni-63(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 prepared at an initial ni-63(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 ni-63(ii) surface speciation at the mordenite/water interfaces should be factored into better predictions of the mobility and bioavailability of ni-63(ii) in environment mediums. |
| 学科主题 | 等离子体物理与核聚变研究 |
| WOS记录号 | WOS:000303184300021 |
| 公开日期 | 2012-07-09 |
| 源URL | [http://ir.hfcas.ac.cn/handle/334002/5666]  |
| 专题 | 合肥物质科学研究院_中科院等离子体物理研究所 |
| 推荐引用方式 GB/T 7714 | Yang, ST,Sheng, GD,Guo, ZQ,et al. Investigation of radionuclide Ni-63(II) sequestration mechanisms on mordenite by batch and EXAFS spectroscopy study[J]. science china-chemistry,2012. |
| APA | Yang, ST,Sheng, GD,Guo, ZQ,Tan, XL,Xu, JZ,&Wang, XK.(2012).Investigation of radionuclide Ni-63(II) sequestration mechanisms on mordenite by batch and EXAFS spectroscopy study.science china-chemistry. |
| MLA | Yang, ST,et al."Investigation of radionuclide Ni-63(II) sequestration mechanisms on mordenite by batch and EXAFS spectroscopy study".science china-chemistry (2012). |
入库方式： OAI收割
来源：合肥物质科学研究院
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。