高等学校化学学报2017，Vol.38Issue(8)：1324-1333,10.DOI:10.7503/cjcu20170027
吡啶吡唑基配体C8-BPP对硝酸溶液中Am3+和Eu3+的萃取
Extraction of Am(Ⅲ) and Eu(Ⅲ) from Nitric Acid Solution with the Pyridylpyrazole Based Ligand C8-BPP
摘要
Abstract
Pyridylpyrazole based ligand 2,6-bis[5-(n-octyl)-1H-pyrazol-3-yl]pyridine(C8-BPP) was synthesized and characterized by means of mass spectrometry(MS), nuclear magnetic resonance(NMR) spectrometry, and Fourier transform infrared spectrometry(FTIR).In the presence of 2-bromohexanoic acid, using n-dodecane as diluent, the extraction behaviors of Am3+ and Eu3+ with C8-BPP were investigated.Influences of diluent, contact time, acidity and the ligand concentration on the extraction of Am3+ and Eu3+ were evaluated in HNO3 solution.The distribution ratio values of Am3+ and Eu3+ decreased with increasing HNO3 concentration from 0.2 to 1.0 mol/L, and increased with increasing ligand concentration from 0.01 to 0.1 mol/L.With the increase of acidity, the separation factors(SFAm/Eu) increased firstly and then decreased.The maximum value of SFAm/Eu can reach 55 at 0.5 mol/L HNO3.Meanwhile, SFAm/Eu values decreased slowly with increasing the ligand concentration but all the SFAm/Eu values were above 40.The extraction results also showed that C8-BPP exhibited good selective extraction ability for Am3+ over RE3+.Moreover, slope analyses indicated the formation of 1∶1 complexes of C8-BPP with Am3+ and Eu3+, separately.Besides, the complexation behaviors of C8-BPP with Eu3+ were also investigated by means of UV-Vis spectrometry titration, electrospray ionization mass spectrometry(ESI-MS), FTIR, Raman spectrometry and time-resolved laser-induced fluorescence spectroscopy(TRLFS).The composition and stability constant(lgK) of the complex of C8-BPP with Eu3+ were also obtained.关键词
吡啶吡唑基配体/溶剂萃取/镅/铕/分离Key words
Pyridylpyrazole based ligand/Solvent extraction/Americium/Europium/Separation分类
化学化工引用本文复制引用
胡晓阳,苏冬萍,李诗萌,王志鹏,张利荣,刘莹,宋莲君,陈志力,丁颂东..吡啶吡唑基配体C8-BPP对硝酸溶液中Am3+和Eu3+的萃取[J].高等学校化学学报,2017,38(8):1324-1333,10.基金项目
国家自然科学基金(批准号: 11675115, 91426302, 91126016)资助.Supported by the National Natural Science Foundation of China(Nos.11675115, 91426302, 91126016). （批准号: 11675115, 91426302, 91126016）
