Basic properties of a silica-based octyl(phenyl)-N,N-diisobutylcarbamoyl-methylphosphine oxide (CMPO) extraction resin (CMPO/SiO2-P) was investigated.Adsorption behavior for some rare earth elements (RE) which are con...Basic properties of a silica-based octyl(phenyl)-N,N-diisobutylcarbamoyl-methylphosphine oxide (CMPO) extraction resin (CMPO/SiO2-P) was investigated.Adsorption behavior for some rare earth elements (RE) which are constituents of high level liquid waste (HLLW) and the long-term stability of the extraction resin in nitric acid solution were examined.The CMPO extraction resin was significantly stable in 3 mol·L?1 HNO3 solution at 50oC.Furthermore,the RE(III) were efficiently separated from non-adsorptive fission product (FP) elements such as Sr(II) in a column experiment using a highly nitric acid solution.The separation behaviors of the elements are considered to result from the difference in their adsorption and elution selectivity based on the complex formation with CMPO.There was no strong dependency of RE(III) separation efficiency on feed solution flow rate.Only from the perspectives of the acid-resistant behavior of CMPO extraction resin and the elution kinetics for the metal ions with the extraction resin,the CMPO extraction resin can be used in the modified MAREC process for HLLW partitioning.展开更多
浊点萃取(cloud point extraction, CPE)是一种安全环保同时兼具高富集系数和低成本的萃取方法,在分析化学中已经被广泛应用于金属离子分析等领域。锕系和镧系金属元素存在环境复杂,自身浓度相对较低,对其进行分离和分析一直是放射化学...浊点萃取(cloud point extraction, CPE)是一种安全环保同时兼具高富集系数和低成本的萃取方法,在分析化学中已经被广泛应用于金属离子分析等领域。锕系和镧系金属元素存在环境复杂,自身浓度相对较低,对其进行分离和分析一直是放射化学研究者所关注的问题。经过条件优化,CPE能够有选择性地分离和富集锕系和镧系金属元素。通过与多种技术联用,CPE能实现锕系和镧系元素的高灵敏度分析。本文在介绍浊点萃取机理的基础上,着重描述了不同萃取体系中各类萃取剂(β-二酮类、膦氧类、含氮类、含硫类)对于锕系和镧系元素的萃取效果,全面总结了其中使用的不同联用技术,同时简述了通过构筑超分子识别位点,修饰配体,使用不同表面活性剂及掩蔽剂等改良现有浊点萃取体系的尝试。最后,对浊点萃取在放射化学领域的应用进行了总结和展望。展开更多
To separate MA(Am,Cm) and some fission product elements(FPs) such as Tc,Pd,Cs and Sr from high level liquid waste(HLLW) systematically,we have been studying an advanced aqueous partitioning process,which uses selectiv...To separate MA(Am,Cm) and some fission product elements(FPs) such as Tc,Pd,Cs and Sr from high level liquid waste(HLLW) systematically,we have been studying an advanced aqueous partitioning process,which uses selective adsorption as the separation method.For this process,we prepared several novel adsorbents which were immobilized in a porous silica/polymer composite support(SiO 2-P).Adsorption and separation behavior of various elements was studied experimentally in detail.Small scale separation tests using simulated HLLW solutions were carried out.Pd(II) was strongly adsorbed by the AR-01 anion exchanger and effectively eluted off by using thiourea.Successful separation of Pd(II) from simulated HLLW was achieved.Tc(VII) also exhibited strong adsorption on AR-01 and could be eluted off by using U(IV) as a reductive eluent.Am(III) presented significantly high adsorbability and selectivity onto R-BTP/SiO 2-P adsorbents over various FPs including Ln(III).The R-BTP adsorbents were fairly stable in 3 M HNO 3,but instable against-irradiation-3M HNO 3.An advanced partitioning process consisting of three separation columns for the target elements separation from HLLW was proposed and the obtained experiment results indicated that the proposed process is essentially feasible.展开更多
文摘Basic properties of a silica-based octyl(phenyl)-N,N-diisobutylcarbamoyl-methylphosphine oxide (CMPO) extraction resin (CMPO/SiO2-P) was investigated.Adsorption behavior for some rare earth elements (RE) which are constituents of high level liquid waste (HLLW) and the long-term stability of the extraction resin in nitric acid solution were examined.The CMPO extraction resin was significantly stable in 3 mol·L?1 HNO3 solution at 50oC.Furthermore,the RE(III) were efficiently separated from non-adsorptive fission product (FP) elements such as Sr(II) in a column experiment using a highly nitric acid solution.The separation behaviors of the elements are considered to result from the difference in their adsorption and elution selectivity based on the complex formation with CMPO.There was no strong dependency of RE(III) separation efficiency on feed solution flow rate.Only from the perspectives of the acid-resistant behavior of CMPO extraction resin and the elution kinetics for the metal ions with the extraction resin,the CMPO extraction resin can be used in the modified MAREC process for HLLW partitioning.
文摘浊点萃取(cloud point extraction, CPE)是一种安全环保同时兼具高富集系数和低成本的萃取方法,在分析化学中已经被广泛应用于金属离子分析等领域。锕系和镧系金属元素存在环境复杂,自身浓度相对较低,对其进行分离和分析一直是放射化学研究者所关注的问题。经过条件优化,CPE能够有选择性地分离和富集锕系和镧系金属元素。通过与多种技术联用,CPE能实现锕系和镧系元素的高灵敏度分析。本文在介绍浊点萃取机理的基础上,着重描述了不同萃取体系中各类萃取剂(β-二酮类、膦氧类、含氮类、含硫类)对于锕系和镧系元素的萃取效果,全面总结了其中使用的不同联用技术,同时简述了通过构筑超分子识别位点,修饰配体,使用不同表面活性剂及掩蔽剂等改良现有浊点萃取体系的尝试。最后,对浊点萃取在放射化学领域的应用进行了总结和展望。
基金supported by the National Natural Science Foundation of China (91026019,91126006)
文摘To separate MA(Am,Cm) and some fission product elements(FPs) such as Tc,Pd,Cs and Sr from high level liquid waste(HLLW) systematically,we have been studying an advanced aqueous partitioning process,which uses selective adsorption as the separation method.For this process,we prepared several novel adsorbents which were immobilized in a porous silica/polymer composite support(SiO 2-P).Adsorption and separation behavior of various elements was studied experimentally in detail.Small scale separation tests using simulated HLLW solutions were carried out.Pd(II) was strongly adsorbed by the AR-01 anion exchanger and effectively eluted off by using thiourea.Successful separation of Pd(II) from simulated HLLW was achieved.Tc(VII) also exhibited strong adsorption on AR-01 and could be eluted off by using U(IV) as a reductive eluent.Am(III) presented significantly high adsorbability and selectivity onto R-BTP/SiO 2-P adsorbents over various FPs including Ln(III).The R-BTP adsorbents were fairly stable in 3 M HNO 3,but instable against-irradiation-3M HNO 3.An advanced partitioning process consisting of three separation columns for the target elements separation from HLLW was proposed and the obtained experiment results indicated that the proposed process is essentially feasible.
