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Solvent Extraction and Complexation Studies of Pyridine-di-Phosphonates with Lanthanides(III) in Solutions 吡啶二膦酸盐与镧系元素(III)溶液的溶剂萃取及络合研究
IF 2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-05-19 DOI: 10.1080/07366299.2023.2214175
E. Konopkina, P. Matveev, A. Kharcheva, Tsagana B. Sumynova, A. Pozdeev, Daniil A. Novichkov, A. Trigub, P. Kalle, A. Kirsanova, S. Kalmykov, V. Petrov, N. Borisova
ABSTRACT In this work, we studied the complex formation (1H, 31P NMR-titration, UV–vis titration, luminescent titration) and solvent extraction of lanthanides with pyridine diphosphonates. The stoichiometry of the complexes was determined: ML and ML2 forms are present. This is confirmed by all of the above methods. It was found that the pyridine ring and P=O groups are involved in the coordination of the metal cation. The coordination environment of the Eu(III) cation was studied more thoroughly using the EXAFS method in solution. Coordination numbers and distances were determined for the complex in solution. The influence of the lanthanide radius on the value of the stability constant was shown. The change in extraction efficiency in the series of lanthanide is described. A new pattern, unusual for other phosphorus-containing ligands, was obtained. To explain the change in the parameters of complexation depending on the system, DFT calculations were carried out. The effect of various initial states of the extracted cations was shown. The initial state with a large amount of nitrates corresponds to a two-phase system during extraction, and with a smaller amount, to a single-phase system with acetonitrile. Additionally, the luminescent properties of the complexes were described in detail as one more applied aspect of the work. . GRAPHICAL ABSTRACT
摘要在这项工作中,我们研究了镧系元素与吡啶二膦酸盐的络合物形成(1H,31P NMR滴定,UV–vis滴定,发光滴定)和溶剂萃取。确定了配合物的化学计量:存在ML和ML2形式。以上所有方法都证实了这一点。发现吡啶环和P=O基团参与了金属阳离子的配位。用EXAFS方法对溶液中Eu(III)阳离子的配位环境进行了较为深入的研究。为溶液中的复合体确定了配位数和距离。研究了镧系元素半径对稳定常数的影响。描述了镧系元素萃取效率的变化。获得了一种新的模式,这对于其他含磷配体来说是不寻常的。为了解释络合参数随体系的变化,进行了DFT计算。显示了提取的阳离子的各种初始状态的影响。含有大量硝酸盐的初始状态对应于萃取过程中的两相系统,而含有少量硝酸盐的起始状态对应于含有乙腈的单相系统。此外,作为工作的另一个应用方面,详细描述了配合物的发光特性。 . 图形摘要
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引用次数: 0
Solvent Extraction, Sequential Separation and Trace Determination of La (III), Ce (III), Nd (III) and Gd (III) with 2, 14-bis[m-nitrophenyl]-Calix[4]Resorcinarene-8, 20-bis[N- phenylbenzo]-dihydroxamic Acid 2,14双[间硝基苯基]-杯[4]间苯二酚-8,20双[N-苯基苯并]-二羟肟酸溶剂萃取、顺序分离及痕量镧、铈、钕、钆
IF 2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-05-16 DOI: 10.1080/07366299.2023.2211631
C. Sharma, R. Patadia, Y. Agrawal
ABSTRACT A novel reagent 2,14-bis[m-nitrophenyl]-calix[4]resorcinarene-8,20-bis[N-phenylbenzo]-dihydroxamic acid (NPC4RADHA) is reported for the liquid-liquid extraction, separation, and simultaneous trace determination of La(III), Ce(III), Nd(III), and Gd(III). The method involves optimizing various parameters such as the concentration of NPC4RADHA, pH, solvent, and extraction time to achieve maximum purity (99.98%) extraction of these rare earths. The stability constant, molar absorptivity, and Beer’s law have been studied. The extracted samples were directly analyzed by ICP-AES, which improves sensitivity with determination limits of 0.020 ng/mL, 0.028 ng/mL, 0.018 ng/mL and 0.025 ng/mL for La, Ce, Nd, and Gd, respectively. The method has been applied to the determination of these elements in monazite sand and standard geological samples. The separation and determination mixture of a Ce(III) and Ce(IV) has been reported.
摘要报道了一种新的试剂2,14-双[间硝基苯基]-杯[4]间苯二酚烯-8,20-双[N-苯基苯并]-二甲酰胺酸(NPC4RADHA),用于液-液萃取、分离和同时测定La(III)、Ce(III),Nd(Ⅲ)和Gd(III)的痕量。该方法包括优化各种参数,如NPC4RADHA的浓度、pH、溶剂和提取时间,以实现这些稀土的最大纯度(99.98%)提取。研究了稳定常数、摩尔吸光系数和比尔定律。提取的样品通过ICP-AES直接分析,提高了灵敏度,测定限为0.020 ng/mL,0.028 ng/mL,0.018 ng/mL和0.025 La、Ce、Nd和Gd分别为ng/mL。该方法已应用于独居石砂和标准地质样品中这些元素的测定。已经报道了Ce(III)和Ce(IV)的分离和测定混合物。
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引用次数: 0
Characterization of a Set of Improved, CMPO-Based, Extraction Chromatographic Resins: Applications to the Separation of Elements Important for Geochemical and Environmental Studies 一组改进的、基于cmpo的萃取色谱树脂的表征:在地球化学和环境研究中重要元素分离中的应用
IF 2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-05-15 DOI: 10.1080/07366299.2023.2206861
C. Pin, Jean-Luc Piro
ABSTRACT This article describes several extraction chromatographic materials aiming to offer improved potential for isolating trace elements with high charge/ionic radius ratio from accompanying matrix elements in natural samples. Starting with commercially available, field-proven, TRU- and RE-Spec materials (Eichrom Technologies), three resins containing less TBP in the CMPO-TBP mixtures, or even neat CMPO only, have been prepared and characterized through measurement of the distribution ratios of some fifty elements in HNO3 and HCl media of variable strength. These resins were further evaluated for analytical applications on geochemical samples. The results highlight a strong enhancement of weight distribution ratios of many elements of interest in geochemistry, cosmochemistry, and environmental sciences (Lanthanides, naturally occurring Actinides, High Field Strength Elements). Combined with good chromatographic characteristics, these high Dw’s make it possible to achieve excellent group separations by using very small columns operated at relatively high, gravity-driven flow rate. Moreover, in an attempt to further improve the selectivity against Fe(III) and Ti(IV), preliminary investigations were made on an additional pair of resin prototypes impregnated with a CMPO-substituted calixarene. Although promising distribution ratio data were obtained, these prototypes did not permit to prepare columns with satisfactory chromatographic characteristics, and this approach still waits for a better impregnation methodof the porous inert support.
摘要:本文介绍了几种萃取色谱材料,旨在提高从天然样品中伴随的基质元素中分离具有高电荷/离子半径比的微量元素的潜力。从商业化的、经过现场验证的TRU-和RE-Spec材料(Eichrom Technologies)开始,制备了三种树脂,其中CMPO-TBP混合物中含有较少的TBP,甚至只有纯CMPO,并通过测量约50种元素在变强度HNO3和HCl介质中的分布比例来表征。进一步评价了这些树脂在地球化学样品分析中的应用。结果突出了地球化学、宇宙化学和环境科学中许多感兴趣的元素(镧系元素、自然存在的锕系元素、高场强元素)的重量分布比的强烈增强。结合良好的色谱特性,这些高Dw可以通过使用非常小的柱在相对高的重力驱动流速下操作来实现出色的组分离。此外,为了进一步提高对Fe(III)和Ti(IV)的选择性,我们对另外一对浸渍cpo -取代杯芳烃的树脂原型进行了初步研究。虽然获得了有希望的分布比数据,但这些原型还不允许制备具有令人满意的色谱特性的柱,该方法仍有待于更好的多孔惰性载体浸渍方法。
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引用次数: 0
Recovery of Lithium from Simulated Nanofiltration-Treated Seawater Desalination Brine Using Solvent Extraction and Selective Precipitation 溶剂萃取-选择性沉淀法从模拟纳滤海水淡化盐水中回收锂
IF 2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-05-11 DOI: 10.1080/07366299.2023.2206440
Stijn Raiguel, Viet Tu Nguyen, Isadora Reis Rodrigues, Clio Deferm, S. Riaño, K. Binnemans
ABSTRACT The world's seas and oceans contain vast amounts of lithium, but the low concentration hereof renders solvent extraction impractical for its recovery. By contrast, seawater desalination brine, after treatment by nanofiltration, contains a roughly tenfold greater concentration of lithium than raw seawater. Hence, lithium can be effectively recovered from such streams using solvent extaction. Compared with other techniques to sequester lithium from dilute solutions, solvent extraction offers the advantages of simple operations, robust and well-established technology and high recovery yields. Thus, we propose a solvent-extraction based process to recover lithium from seawater desalination brine, treated by nanofiltration. The first step comprises the removal of magnesium and calcium using methyltrioctylammonium neodecanoate in p-cymene. This is followed by a lithium extraction step using the extractants Mextral 54–100 and Cyanex 923 in Shellsol D70 diluent. The lithium extract is then scrubbed with water and stripped with hydrochloric acid. Subsequently, residual alkaline earth metals are removed with sodium hydroxide in ethanol and finally lithium is precipitated using sodium carbonate. The solvent extraction, scrubbing and stripping steps were demonstrated on mini-pilot scale in continuous countercurrent mode (in mixer-settlers), while the precipitation steps were demonstrated in batch. The process was found to have an overall yield of 74%, affording a lithium carbonate product with a purity of 97 wt%.
摘要世界海洋中含有大量的锂,但由于锂的浓度较低,溶剂萃取无法回收锂。相比之下,海水淡化盐水经过纳滤处理后,其锂浓度大约是原海水的十倍。因此,可以使用溶剂萃取从这样的流中有效地回收锂。与其他从稀溶液中螯合锂的技术相比,溶剂萃取具有操作简单、技术稳健、回收率高的优点。因此,我们提出了一种基于溶剂提取的工艺,通过纳滤处理从海水淡化盐水中回收锂。第一步包括使用对-辛烯中的新癸酸甲基三辛基铵除去镁和钙。随后使用Shellsol D70稀释剂中的萃取剂Mextral 54–100和Cyanex 923进行锂萃取步骤。然后用水洗涤锂提取物并用盐酸汽提。随后,用氢氧化钠在乙醇中除去残留的碱土金属,最后用碳酸钠沉淀锂。溶剂萃取、洗涤和汽提步骤在小型中试规模上以连续逆流模式(在混合沉降器中)进行了演示,而沉淀步骤则在分批中进行了演示。发现该方法的总产率为74%,得到纯度为97的碳酸锂产品 重量%。
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引用次数: 2
Optimization of Cesium Ion Exchange Performance with Hanford Tank Waste Feed Dilution Hanford槽废液进料稀释对铯离子交换性能的优化
IF 2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-05-08 DOI: 10.1080/07366299.2023.2205440
A. Westesen, E. Campbell, R. Peterson
ABSTRACT Crystalline silicotitanate (CST) ion exchanger is currently used to remove cesium (137Cs) from the aqueous phase of Hanford tank wastes in preparation for vitrification at the Waste Treatment and Immobilization Plant (WTP). The CST is a non-elutable inorganic ion exchanger targeted to maintain a decontamination factor of ≥1,000 prior to the column effluent reaching a waste acceptance criterion. In an effort to reduce costs generated by ion exchange processing, system optimization of the waste treatment has been conducted. Decreasing the tank waste supernate sodium molarity prior to processing through the ion exchange columns showed that it can significantly reduce the number of columns used while maintaining the necessary sodium throughput. Optimization of this process can result in significant cost savings and ultimately result in less waste production.
摘要结晶硅钛酸盐(CST)离子交换器目前用于从汉福德储罐废物的水相中去除铯(137Cs),为废物处理和固定化厂(WTP)的玻璃化做准备。CST是一种不可洗脱的无机离子交换器,其目标是在柱流出物达到废物接受标准之前保持≥1000的去污因子。为了降低离子交换处理产生的成本,已经对废物处理进行了系统优化。在通过离子交换柱处理之前降低罐废上清液的钠摩尔浓度表明,它可以显著减少所用柱的数量,同时保持必要的钠产量。该工艺的优化可以显著节省成本,并最终减少废物产生。
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引用次数: 0
Ditopic Extractants to Separate Palladium(II) and Platinum(IV) Chloridometalates via Inner or Outer Sphere Binding 通过内球或外球结合分离氯金属酸钯(II)和铂(IV)的双萃剂
IF 2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-05-08 DOI: 10.1080/07366299.2023.2197969
A. Wilson, R. A. Grant, Ross J. Gordon, J. Love, C. Morrison, Kirstian J. Macruary, G. Nichol, P. Tasker
ABSTRACT New thioetheramide ligands (L, PhS(CH2)nCONRR’) co-extract Pd(II) and Pt(IV) from acidic chloride solutions. The Pd is transferred to a water-immiscible phase as a [Pd(L)2Cl2] complex with thioether groups in the inner sphere whilst Pt is extracted in an outer-sphere assembly, [(LH)2·PtCl6], containing protonated reagent molecules LH+ that charge-balance the chloridoplatinate dianion, [PtCl6]2-. The much higher kinetic and thermodynamic stability of the Pd(II) complex makes it possible to strip the Pt into a weakly acidic aqueous phase before recovering the Pd by back-extraction into aqueous ammonia to form [Pd(NH3)4]Cl2, thereby separating the two elements. An alkyl spacer group with two methylene units between the thioether (S) and amide (C) atoms is a stronger extractant for both metals than those with one or three methylene units. The extractants reject trianionic chloridometalates with higher hydration energies such as [IrCl6]3-. X-ray structures of two [Pd(L)2Cl2] complexes (L, PhSCH2CONH-n-C4H9 or PhS(CH2)2CONH-n-C4H9) have planar coordination with a transarrangement of the thioether groups and geometries very similar to those predicted by DFT calculations. These calculations show that addition of a proton to the proligands L generates a pseudochelate with the added H+ located between the S atom and the carbonyl O atom. In contrast to related ether- and amino-amide extractants, this pseudochelate ring is broken in the [(LH)2.PtCl6] assemblies formed by the thioetheramides and the OH+ and NH units make the close contacts to the PtCl6 2- ion.
摘要:新型硫醚酰胺配体(L,PhS(CH2)nCONRR')从酸性氯化物溶液中共萃取Pd(II)和Pt(IV)。Pd以[Pd(L)2Cl2]络合物的形式转移到水不混溶相中,该络合物在内部球体中具有硫醚基团,而Pt在外部球体组件[(LH)2·PtCl6]中被提取,该组件包含质子化试剂分子LH+,该分子电荷平衡氯代铂酸二阴离子[PtCl6]2-。Pd(II)络合物更高的动力学和热力学稳定性使得在通过反萃取到氨水中回收Pd以形成[Pd(NH3)4]Cl2之前将Pt剥离成弱酸性水相成为可能,从而分离这两种元素。在硫醚(S)和酰胺(C)原子之间具有两个亚甲基单元的烷基间隔基对这两种金属都是比具有一个或三个亚甲基单元更强的萃取剂。萃取剂排斥具有较高水合能的三元氯代金属盐,如[IrCl6]3-。两个[Pd(L)2Cl2]配合物(L,PhSCH2CONH-n-C4H9或PhS(CH2)2CONH-n-C4H9)的X射线结构具有与硫醚基团的转移排列非常相似的平面配位,并且几何结构与DFT计算预测的非常相似。这些计算表明,在前配体L中添加质子会产生一个赝helate,其中添加的H+位于S原子和羰基O原子之间。与相关的醚酰胺和氨基酰胺萃取剂相比,这种伪螯合环在硫醚酰胺形成的[(LH)2.PtCl6]组装体中被破坏,OH+和NH单元与PtCl6 2-离子紧密接触。
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引用次数: 1
Low and High LET Degradation Studies of Metal-Loaded Organic Phase Ligands in the ALSEP Process ALSEP过程中载金属有机相配体的低、高LET降解研究
IF 2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-04-26 DOI: 10.1080/07366299.2023.2202224
Christian G. Bustillos, Randy Ngelale, Mikael G. Nilsson
ABSTRACT Organic solutions comprising the Actinide Lanthanide Separation Process (ALSEP) solvent consisting of 0.5 M 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (HEH[EHP]) and 0.05 M N,N,N’,N’-tetra(2-ethylhexyl)diglycolamide (T2EHDGA) in n-dodecane were subjected to low LET and high LET irradiation before and after equilibration with an aqueous phase of 3 M HNO3. Degradation dose constants revealed greater ligand degradation due to gamma irradiation than alpha irradiation for both ligands. Furthermore, equilibration with nitric acid did not have a significant impact on ligand degradation for either irradiation source. Identified degradation products were similar for both gamma and alpha irradiation and occurred mostly through the rupture of the N–Ccarbonyl and C–Oether bonds for T2EHDGA and the C–Oether bond in HEH[EHP]. Acid contact appears to alter the degradation pathway by favoring the formation of higher molecular weight recombination products. Mixed T2EHDGA-HEH[EHP]-NO3 complexes were formed with Nd(III) after extraction from 3 M HNO3, and low LET gamma irradiation of the Nd(III) loaded organic solution produced similar degradation products as the organic solution absent of Nd(III). Interestingly, and likely due to the greater radiolytic susceptibility of T2EHDGA than HEH[EHP], a HEH[EHP]-Nd(III) complex appears to form as the T2EHDGA degrades with increasing absorbed dose.
摘要包含锕系元素-镧系元素分离工艺(ALSEP)溶剂的有机溶液,该溶剂由0.5 M-2-乙基己基膦酸单-2-乙基己基酯(HEH[EHP])和0.05 在用3 M HNO3。降解剂量常数显示,对于两种配体,由于γ辐射而导致的配体降解大于α辐射。此外,用硝酸平衡对两种辐射源的配体降解都没有显著影响。已鉴定的降解产物在γ和α辐照下相似,主要通过T2EHDGA的N–C羰基和C–Oether键以及HEH[EHP]的C–Oether键断裂发生。酸接触似乎通过有利于形成更高分子量的重组产物来改变降解途径。Nd(III)从3 M HNO3和负载Nd(III)的有机溶液的低LET伽马辐射产生与不存在Nd(Ⅲ)的有机溶剂类似的降解产物。有趣的是,很可能是由于T2EHDGA比HEH[EHP]更大的放射分解敏感性,随着T2EHDGA随着吸收剂量的增加而降解,似乎形成了HEH[EHP]-Nd(III)复合物。
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引用次数: 0
Indium Extraction from Sulfate Solutions with a Mixture of Di(2-Ethylhexyl)Phosphoric Acid and Octyl Alcohol 用二(2-乙基己基)磷酸和辛醇混合物从硫酸盐溶液中萃取铟
IF 2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-04-10 DOI: 10.1080/07366299.2023.2197016
I. Fleitlikh, N. Grigorieva, A. Tikhonov, V. Krasnov, Elena Karpova, O. Logutenko
ABSTRACT In this work, solvent extraction of In(III) from sulfate solutions by using mixtures of D2EHPA with octyl alcohol and octanoic acid was investigated. The introduction of the additives into the organic phase was shown to lead to an antagonistic effect thus facilitating efficient indium stripping from the loaded organic phase. The antagonistic effect is significantly higher in the D2EHPA (HR) and octyl alcohol (HA) mixtures. The formation of stable associates between D2EHPA and HA leads to a decrease in the extraction efficiency of indium. In the presence of alcohol, almost complete stripping of indium from a D2EHPA loaded phase can be achieved to produce a strip liquor containing>33.0 g/L In. Based on the analysis of the extraction data and by using nuclear magnetic resonance (NMR) and infrared (IR) spectroscopy of the organic phases, it was concluded that indium extraction with D2EHPA in octyl alcohol is due to the formation of the extracted compound InR3. The equilibrium constant (logK) for indium extraction with solutions of D2EHPA in octyl alcohol was found to be − 0.12 ± 0.05. Extraction systems containing D2EHPA and octyl alcohol can be used to recover indium from various industrial solutions, in particular from the solutions derived from lead-zinc production and from liquid crystal display panel wastes.
摘要本文研究了D2EHPA与辛醇、辛酸的混合溶剂萃取硫酸盐溶液中的In(III)。在有机相中引入添加剂会导致拮抗作用,从而促进从负载的有机相中有效地剥离铟。D2EHPA (HR)和辛醇(HA)混合物的拮抗作用明显更高。D2EHPA与HA之间形成稳定的缔合物,导致铟的萃取效率下降。在醇的存在下,从负载D2EHPA的相中几乎完全剥离铟,可以得到含>33.0 g/L In的条状液。通过对萃取数据的分析,结合有机相的核磁共振(NMR)和红外(IR)光谱分析,得出D2EHPA在辛醇中萃取铟是由于被萃取物InR3的形成。D2EHPA在辛醇溶液中萃取铟的平衡常数(logK)为- 0.12±0.05。含有D2EHPA和辛醇的提取系统可用于从各种工业溶液中回收铟,特别是从铅锌生产和液晶显示面板废料中提取的溶液中。
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引用次数: 0
Synergistic Solvent Extraction of Erbium(III) using a Mixture of Neodecanoic Acid with 1-(2-Neononylamidoethyl)-2-Neononyl-2-Imidazoline 新癸酸与1-(2-Neononylamidoethyl)-2- neononyl -2-咪唑啉混合溶剂协同萃取铒(III
IF 2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-04-09 DOI: 10.1080/07366299.2023.2187700
S. Bondareva, Y. Murinov
ABSTRACT The solvent extraction of erbium(III), representing heavy lanthanides, from nitrate solutions has been studied using a novel mixture of neodecanoic acid (HA) with 1-(2-neononylamidoethyl)-2-neononyl-2-imidazoline (L) in toluene with 15 % (v/v) of n-decanol. The synergistic extraction of erbium(III) has been found in the equilibrium pH range from 6.0 to 6.5. The effects of the equilibration time, the temperature, the nature of diluent, the aqueous phase acidity, and variation of one extractant at a fixed concentration of the other extractant have been investigated. The temperature had no effect on the extraction process in the range of 0–45°C. FT-IR spectra of the mixed extractant before and after extraction of erbium were examined, and the loading capacity of the mixed extractant for Er(III) was determined. The experimental data indicated that the erbium ion is not directly coordinated by L, and the nitrate ions are not involved in the extraction of erbium(III). In the equilibrium pH range between 5.0 and 6.0, the extracted species were determined to be [Er(OH)A2·L] by the slope analysis method. The increase in the pH leads to the dominance of [Er(OH)2A·L] as the main extracted species. The extraction mechanism is discussed. The Nd/Pr, Y/Pr, Dy/Y, Ho/Y, and Er/Y separation factors were calculated, and the possibility of the separation of the Er–Y pair was demonstrated.
研究了新癸酸(HA)与1-(2-新炔酰胺乙基)-2-新炔-2-咪唑啉(L)在甲苯中以15% (v/v)的正癸醇为溶剂从硝酸溶液中萃取重系镧的方法。在平衡pH为6.0 ~ 6.5的范围内,发现了铒(III)的协同萃取。考察了平衡时间、温度、稀释剂性质、水相酸度以及一种萃取剂在另一种萃取剂固定浓度下的变化等因素的影响。温度在0 ~ 45℃范围内对提取过程无影响。考察了混合萃取剂萃取铒前后的FT-IR光谱,并测定了混合萃取剂对Er(III)的负载能力。实验数据表明,铒离子不与L直接配位,硝态氮离子不参与铒(III)的萃取。在平衡pH 5.0 ~ 6.0范围内,通过斜率分析法确定提取物为[Er(OH)A2·L]。随着pH的增加,[Er(OH)2A·L]成为主要的被萃取物。讨论了萃取机理。计算了Nd/Pr、Y/Pr、Dy/Y、Ho/Y和Er/Y分离因子,并证明了Er - Y对分离的可能性。
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引用次数: 0
Comparison of Cyclic Irradiation Behavior of Tri-Butyl Phosphate / Tri-Iso-Amyl Phosphate-Dodecane System in Nitric Acid Medium 磷酸三丁酯/磷酸三异戊酯-十二烷体系在硝酸介质中循环辐照行为的比较
IF 2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2023-04-05 DOI: 10.1080/07366299.2023.2193592
Satyabrata Mishra, N. Desigan, K. A. Venkatesan, K. Ananthasivan
ABSTRACT The degradation behavior of gamma irradiated solution of 1.1 M tri-butyl phosphate (TBP) in n-dodecane (n-DD) and 1.1 M tri-iso-amyl phosphate (TiAP) in n-DD loaded with nitric acid and uranium were compared up to 5 cycles upon recycling of the degraded solvent after 80 kGy in each cycle. The solvent was recycled by stripping the loaded metal with dilute nitric acid followed by alkali wash using sodium carbonate after each cycle. Subsequently, the physico-chemical properties and the metal extraction – retention properties of the recycled solvent were measured. The recycled solvent was analyzed using gas chromatographic and FT-IR spectroscopic analysis. Among the physico-chemical properties the interfacial tension of the recycled solvent decreased drastically after three cycles of irradiation, but the variation in the measured phase separation time was not significant. But, the concentration of the extractant (TBP/TiAP) decreased significantly upon recycling. Though the formation of nitro compounds was obvious from FT-IR analysis, the metal retention by recycled organic phases were comparable after each cycle of irradiation. HIGHLIGHTS Cyclic irradiation behavior of TiAP/n-DD and TBP/n-DD was compared under acid loaded and uranium loaded condition. The number of cycles, the solvent can be reused upon recycling was evaluated. Cyclic irradiation under uranium loading condition leads to degradation of the extractant (TBP/TiAP) to a significant extent as evident from GC-analysis. Accumulation of unwashable degraded products takes place upon recycling based on FT-IR analysis. GRAPHICAL ABSTRACT
1.1γ辐照溶液的降解行为 M磷酸三丁酯(TBP)在正十二烷(n-DD)和1.1 M磷酸三异戊酯(TiAP)在负载硝酸和铀的n-DD中的循环进行比较,每次循环80kGy后回收降解的溶剂达5次循环。通过用稀硝酸汽提负载的金属,然后在每个循环后用碳酸钠进行碱洗来回收溶剂。随后,测量了回收溶剂的物理化学性质和金属萃取-保留性质。使用气相色谱和FT-IR光谱分析对回收的溶剂进行分析。在物理化学性质中,回收溶剂的界面张力在三次辐照后急剧下降,但测得的相分离时间变化不大。但是,萃取剂(TBP/TiAP)的浓度在再循环后显著降低。尽管从FT-IR分析中可以明显看出硝基化合物的形成,但在每个辐照循环后,回收有机相对金属的保留是相当的。重点比较了TiAP/n-DD和TBP/n-DD在酸负载和铀负载条件下的循环辐照行为。评估了循环次数,溶剂在回收后可以重复使用。GC分析表明,在铀负载条件下的循环辐照会在很大程度上导致萃取剂(TBP/TiAP)的降解。基于FT-IR分析,回收后会积累不易清洗的降解产物。图形摘要
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Solvent Extraction and Ion Exchange
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