JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2017
·Vol. 313
·期 2
·309-318
·
IF 1.282
Wang Zhipeng,Huang Huang,Ding Songdong,Hu Xiaoyang,Zhang Lirong,Liu Ying,Song Lianjun,Chen Zhili,Li Shimeng
Abstract Two diglycolamide homologs, N,N,N′,N′ -tetraoctyl-3,6-dioxaoctane diamide (DOODA) and N,N,N′,N′ -tetraoctyl-3,6,9-trioxaundecane diamide (TOUDA), were synthesized. Their extraction behaviors of Am 3+ and Eu 3+ were investigated and compared with those of N,N,N′,N′ -tetraoctyl-3-oxapentane diamide (TODGA). The extraction ability toward Am 3+ and Eu 3+ decreased with increasing etheric oxygen number in the extractant structure. In contrast to TODGA, an very interesting inversion on the selectivity occurred for DOODA and TOUDA, which were more favor of extracting Am 3+ than Eu 3+ . The maximum SF
Am/Eu of 3.5 for DOODA can be achieved at 3.0 mol/L HNO 3 . The stoichiometries of extracted species and extraction thermodynamic parameters were also presented. Graphical Abstract
研究领域:
化学
·
核化学与放射化学
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 327
·期 1
·565-573
·
IF 1.371
Chen Qi,Lu Chuan,Hu Yifu,Liu Yaoyang,Zhou Yu,Jiao Caishan,Zhang Meng,Hou Hongguo,Gao Yang,Tian Guoxin
The extraction behavior of several lanthanide ions (La(III), Nd(III), Sm(III), Gd(III), Yb(III)) from the nitric acid medium using ionic liquid [C 4 mim][NTf 2 ] solvent containing N,N’-dimethyl-N,N’-dioctyl-3-oxadiglycolamide (DMDODGA) was studied. The effects of the concentration of HNO 3 , H + and NO 3 − in aqueous phase, as well as the DMDODGA concentration and temperature on the distribution ratio of Ln(III) were analyzed. The distribution ratio of lanthanide ions into [C 4 mim][NTf 2 ] is much higher than that reported for aliphatic hydrocarbon diluents. The extraction mechanism was demonstrated to agree with the cation-exchange mechanism. The stoichiometric ratio of Ln (III)/DMDODGA complex is 1:3 or 1:4.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 22
·7210-7218
·
IF 4.029
Wenhui Liu,Qi Wang,Yan Zheng,Shubin Wang,Yan Yan,Yanzhao Yang
In this study, a method of one-step separation and recycling of high purity Pd(II) and Pt(IV) using an ionic liquid, 1-butyl-3-benzimidazolium bromate ([HBBIm]Br), was investigated. The effects of [HBBIm]Br concentration, initial metal concentration, and loading capacity of [HBBIm]Br were examined in detail. It was observed that [HBBIm]Br was a very effective extractant for selectively extracting Pd(II) and precipitating Pt(IV). Through selectively extracting Pd(II) and precipitating Pt(IV), each metal with high purity was separately obtained from mixed Pd(II) and Pt(IV) multi-metal solution. The method of one-step separation of Pd(II) and Pt(IV) is simple and convenient. The anion exchange mechanism between [HBBIm]Br and Pt(IV) was proven through Job's method and FTIR and 1H NMR spectroscopies. The coordination mechanism between [HBBIm]Br and Pd(II) was demonstrated via single X-ray diffraction and was found to be robust and distinct, as supported by the ab initio quantum-chemical studies. The crystals of the [PdBr2 ·2BBIm] complex were formed first. Moreover, the influence of the concentrations of hydrochloric acid, sodium chloride, and sodium nitrate on the precipitation of Pt(IV) and extraction of Pd(II) was studied herein. It was found that only the concentration of H+ could inhibit the separation of Pt(IV) because H+ could attract the anion PtCl62−; thus, the exchange (anion exchange mechanism) between the anions PtCl62− and Br− was prevented. However, both the concentration of H+ and Cl− can obviously inhibit the extraction of Pd(II) because H+ and Cl− are the reaction products and increasing their concentration can inhibit the progress of the reaction (coordination mechanism).
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
HYDROMETALLURGY
·
2017
·
IF 2.605
Xingyu Chen,Qiang Chen,Fuliang Guo,Yulong Liao,Zhongwei Zhao
Leaching of scheelite by adopting the sulfur-phosphorus mixed acid allowed the accompanied rare-earth elements to enter a leaching solution. The leaching solution contained ions that could be coordinated with rare-earth ions, such as phosphotungstic acid anions, sulfate anions and phosphate anions, among others. To efficiently extract rare earths from the leachate, the extraction behavior of rare-earth ions in the solution was examined. Experimental results indicated that when the solution pH was lower than 1, phosphotungstic acid existed in the form of Keggin-type (1:12) [PW 12 O 40 ] 3 − , which exhibited a relatively poor complexing ability. Thus, secondary carbon primary-amine (N1923) could only extract phosphotungstic acid anions without extracting rare earths. As pH increased, a number of WO groups were dropped from the [PW 12 O 40 ] 3 − ion to form unsaturated phosphotungstic acid. Unsaturated phosphotungstic acid anions with rare-earth ions exhibited a complexing ability stronger than that with SO 4 2 − . Rare-earth ions were mainly complex with unsaturated phosphotungstic acid to form stable anions in the solution and could be extracted completely by the anionic extractant N1923. Meanwhile, the cationic extractant P204 could hardly extract rare earths. As the pH rose and exceeded 2.75, the concentration of PO 4 3 − increased, rendering the complexation between the rare-earth ions and PO 4 3 − dominant. Hence, rare-earth ions were precipitated.
研究领域:
冶金学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2019
·Vol. 319
·期 3
·1219-1225
·
IF 1.186
Dai Ying,Cao Bin,Zhong Shimin,Xie Guanbao,Wang Youqun,Liu Yuhui,Zhang Zhibin,Liu Yunhai,Cao Xiaohong
Comparing with the traditionally immiscible two-phase extraction, the homogeneous liquid–liquid extraction technique shows potential in industrial separation engineering due to nearly infinite contact interface. In this work the ionic liquid (IL) compounds such as N -(carboxymethyl)- N , N -dimethylethanaminium bis-trifluoromethane-sulfonimide ([DHbet][Tf 2 N]) and N -(carboxyethyl)-trimethylammonium bistrifluoromethane-sulfonimide ([THbet][Tf 2 N]) were synthesized. The homogeneous extraction behaviors of europium with two ILs were studied as functions of solution pH, ionic strength, contact time, and initial europium concentration. The results indicated that both homogeneous extractions were dependent on pH and independent on ionic strength. The extraction capacities for [DHbet][Tf 2 N] and [THbet][Tf 2 N] were 3.29 mmol/L and 3.16 mmol/L, respectively. ILs could be recovered using 1.0 M hydrochloric acid. The mole-ratio method indicated the formation of a mononuclear complex between the europium ion and IL. Total europium extraction efficiencies of more than 91% for [DHbet][Tf 2 N] and more than 90% for [THbet][Tf 2 N] were obtained by quadruple-stage countercurrent extraction. The result proves the feasibility of the homogeneous liquid–liquid extraction technique as an alternative option for europium separation from aquatic solution.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2017
·Vol. 314
·期 1
·59-67
·
IF 1.282
Liu Zhanxiang,Dong Yang,Liao Jiali,Li Xingliang,Yang Jijun,Yang Yuanyou,Luo Shunzhong,Liu Ning
A novel extractant, 5-octyloxymethyl-7-bromo-8-quinolinol (HBrO 8 Q), was employed to extract Pd(II) from low-acidity aqueous solution. The extraction behaviors indicated that HBrO 8 Q had high extraction efficiency and selectivity for Pd(II) under the experimental conditions, and the stoichiometry of Pd(II) with HBrO 8 Q was found to be 1:1 by means of mole ratio method and Job’s method. The thermodynamic study indicated that the extraction process was endothermic and spontaneous. Additionally, complete back extraction of palladium could be achieved by using acidic thiourea solution.
研究领域:
化学
·
环境科学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2012
·Vol. 177
·期 1
·237-243
·
IF 3.033
Fan Yunchang,Zhang Sheli,Yang Fanming,Niu Haibo,Shi Jiajia
We have prepared the hydrophobic amino-functionalized ionic liquid (IL) 1-(2-aminoethyl)-3-butylimidazolium hexafluorophosphate and investigated its extraction behavior for copper(II) ion as a model cation. The IL, due to the presence of an amino group, is capable of complexing Cu(II) in a ratio of 6:1. The parameters affecting the extraction efficiency were optimized. The IL-based liquid–liquid microextraction was successfully applied to the analysis of Cu(II) in an environmental water standard reference material. The results are promising in terms of liquid–liquid microextraction, separation, and preconcentration of Cu(II).
A hydrophobic amino-functionalized ionic liquid (IL) [NH 2 C 2 C 4 im][PF 6 ] was synthesized. The IL exhibits good extractability for copper (II) ion due to the presence of an amino group.
研究领域:
化学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Ning Wang,Qi Wang,Wenjuan Lu,Miaoyan Ru,Yanzhao Yang
The extraction and stripping behaviors of Pt(IV) from acidic chloride media by 2,2-diheptyl-1,1,3,3-tetramethylguanidinium bromide were investigated. The extraction of Pt(IV) was carried out by modulating various parameters such as concentration of the extractant, temperature, and concentration of HCl solution. Based on the characterization of experimental results such as Job's method data, UV–vis spectra and fourier transform infrared spectra analysis, the anion exchange mechanism was confirmed. Quantum chemical calculations were performed to provide theoretical support for the mechanism. The ionic liquid showed outstanding selectivity for Pt(IV) over the base metals. Furthermore, the organic phase could be easily used for four extraction-stripping cycles by reductive stripping process using 0.5 M CS(NH 2 ) 2 /0.5 M HCl. The numbers of theoretical stages needed for the effective extraction and stripping of Pt(IV) has been determined by McCabe Thiele's diagram. Under the selected counter-current extraction and stripping stages, the extraction efficiency and stripping efficiency could reach 99.5% and 99.0%, respectively. Therefore, the system is highly effective, selective and recyclable to extract Pt(IV). On the basis of the extraction protocol, the system may be a promising candidate for highly selective extraction of Pt(IV).
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
·
IF 3.359
Xin Lu,Dongxiang Zhang,Shengnan He,Jian Feng,Alemtsehay Tesfay Reda,Cong Liu,Zhi Yang,Lei Shi,Jinying Li
In this paper, extraction behaviors of different carboxylic acid modified calixarenes towards Eu(III) and Nd(III) were performed. These extractants were extensively evaluated for the extraction abilities for extraction of Eu(III) and Nd(III) under different conditions, including pH, concentration of extractants and temperature. Carboxylic acid modified calix[6]arene (extractant- 2 ) showed remarkably high extraction ability for Eu(III) and Nd(III). The thermodynamic parameters (enthalpy, entropy and Gibbs free energy) were determined. The extraction of Eu(III) with extractant- 2 occurred with a cation exchange reaction and this extraction reaction is an exothermic process. Kinetic studies of reactive extraction of Eu(III) with extractant- 2 were performed in a stirred cell. The value of mass-transfer coefficient of Eu(III) in chloroform was evaluated to be 3.35 × 10 −6 m s −1 . The Hatta number was calculated and observed to vary in the range of 3.80 × 10 −4 –9.10 × 10 −4 . The effects of stirring speed, the phase volume ratio and species concentration on the initial extraction rate and Hatta number, demonstrate that the reaction is a very slow chemical reaction process occurring at the bulk of the organic phase. The rate constants of forward and backward reactions were determined to be 3.05 × 10 −2 (kmol m −3 ) −0.64 s −1 and 1.55 × 10 −3 (kmol m −3 ) −2.64 s −1 , respectively.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）