SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Shuo Du,Xiaofu Guo,Jinlong Li,Mengmeng Sun,Yingjie Liu,Qing Ye,Jingtao Bi,Shizhao Wang,Fei Li,Jie Liu,Yeling Zheng,Yingying Zhao
The development of ionic liquids (ILs)-based extractants for the solvent extraction of rare earth elements (REEs) is of great importance but still faces challenges. Based on the molecular structure and thermodynamic characteristics of temperature-responsive ILs (TRILs), a design method for TRILs was developed with the COSMO-SAC solvation model and quantum chemical calculations. A novel dicarboxylate TRILs, 1,6-bis(carboxyethyl)-N,N,N’,N’-tetramethyl-1,6-hexanediamine bis(trifluoromethanesulfonyl)imide ([CM-TMHDA][Tf 2 N] 2 ) was successfully synthesized, along with dihydroxy TRILs 1,6-Bis(hydroxyethyl)-N,N,N’,N’-tetramethyl-1,6-hexanediaminium bis(trifluoromethanesulfonyl)imide ([HE-TMHDA][Tf 2 N] 2 ) and diester TRILs 1,6-Bis(ethyl acetate)-N,N,N’,N’-tetramethyl-1,6-hexanediaminium bis(trifluoromethanesulfonyl)imide ([EA-TMHDA][Tf 2 N] 2 ) reported in literatures. By combining experimental and molecular simulation analyses, the phase behavior of [CM-TMHDA][Tf 2 N] 2 and the effects of acids and inorganic salts on its phase behavior were systematically studied. Additionally, a temperature-controlled phase transition system composed of TRILs and aqueous solutions was developed for the extraction and separation of Nd(III) from aqueous solutions. The results indicated that the homogeneous extraction system constructed with TRILs reduced interfacial mass transfer resistance, significantly enhancing the extraction kinetics of Nd(III). Various experimental parameters were optimized, revealing that under the conditions of 80 °C for 30 min, the carboxylic functionalized IL achieved optimal extraction efficiency for Nd(III), reaching 56 %. After four cycles, the extraction performance of [CM-TMHDA][Tf 2 N] 2 maintained. This study provides new insights for improving the separation and extraction techniques of REEs, demonstrating substantial potential for applications in this field.
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
HYDROMETALLURGY
·
2016
·
IF 2.29
Zhang Peng,Dong Linfei,Zhang Dongxiang,Lei Shi,Hongmei Yang,Jinying Li,Wang Yaling,V.V. Tarasov
Calix[4]arene derivatives including diethyl phosphite groups were used for the first time for separating Nd(III) from nitrate media. Calix[4]arene derivatives were synthesized and characterized by infrared spectroscopy (IR), mass spectroscopy (MS), and 1 H NMR. Four calix[4]arene derivatives, CalixF (①), DCalixF (②), PCalixF (⑤), and POCalixF (⑥), were used in a solvent extraction method. The effects of aqueous acidity, diluent, temperature, shaking time, and Nd(III) concentration were investigated. The results showed that the extraction ability of ⑤ and ⑥ with a phosphate functional group at the upper rim were best for the extraction of Nd(III). Derivative ⑥ had better complexing capacities than ⑤ for the generation of a phenolic hydroxyl group at the lower rim. The enthalpy (∆ H O ), Gibbs free energy (∆ G O ), and entropy (∆ S O ) changes for the extraction were obtained from a thermodynamic study. The results showed that the extraction of Nd(III) from a nitric acid system might be an endothermic reaction since the process was naturally spontaneous and increasing the temperature during extraction was determined to be thermodynamically feasible. The extraction of Nd(III) was governed by a two-stage chemical reaction and diffusion process. In the first stage, the process was controlled by a fast chemical reaction at the liquid-liquid interface. The composition of the Nd(III)-calix[4]arene derivative complex was determined to be [Nd(NO 3 ) 3 ] 2 [L]. The second stage was the diffusion of extracted products towards equilibrium. Calix[4]arene derivative ⑥ was found to be an efficient extractant for the separation of Nd(III) and would be a potential extractant for the disposal of radioactive waste in spent fuel .
研究领域:
化学
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核能科学
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环境科学
✓ 已验证
DOI
高影响因子
Russian Journal of Physical Chemistry A
·
2022
·Vol. 96
·期 5
·1077-1084
·
IF 0.791
Huang Feng-Yu,Wang Zhe,Yi Fa-Cheng,Liu Yan,Wu Ya-Dong,Luo Ying,Jia Wen-Jing
Abstract A local bentonite from Gaomiaozi county (Inner Mongolia province, China) was purified, and the X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscope (SEM) were used for the characterization of the purified sample to determine its chemical constituents and microstructures. The sorption behavior of Nd(III) on bentonite was performed by batch technique, and the effects of contact time, clay dosage, pH, ionic strength and temperature were investigated. The results indicated that sorption of Nd(III) on bentonite was strongly dependent on pH values, suggesting that surface complexation was the main sorption mechanism in the sorption process. The sorption isotherm fitted well by Langmuir models. The thermodynamic parameters, such as, enthalpy (∆ H °), entropy (Δ S °), and Gibbs free energy (Δ G °) were calculated from the temperature dependent sorption data, and the results indicated that the sorption of Nd(III) on bentonite was a spontaneous process, and the sorption was endothermic.
研究领域:
环境科学
·
放射化学
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2022
·Vol. 331
·期 4
·1759-1767
·
IF 1.754
Liu Yaoyang,Liu Zhibin,Zhao Chuang,Jiao Caishan,Zhang Meng,Zhou Yu,Gao Yang,Li Huibo,He Hui
In order to further study the structure-performance relationship of unsymmetrical diglycolamides. In this work, two types of unsymmetrical diglycolamides (Structure A : N,N’ -dimethyl- N,N’ -didecyl diglycoamide, L I , N,N’ -dimethyl- N,N’ -didodecyl diglycoamide, L III ; Structure B : N,N -dimethyl- N’,N’ -didecyl diglycoamide, L II , N,N -dimethyl- N’,N’ -didodecyl diglycoamide, L IV ), which are geometrical isomers each other, were synthesized, and their extraction performances in 40/60 (v/v)% n-octanol/kerosene were studied and compared. The related results reveal that the size of the alkyl substituents attached on the amide N atoms can influence the extractant performance of the extractant, and the difference in the geometric structure of extractants can lead to the differences in their extraction performances.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Zhao Zhang,Ningning Ma,Xiena Kang,Xinping Li,Shuangquan Yao,Wenjia Han,Hui Chang
A series of lanthanide-based nanopaper (Nd-nanopaper) was synthesized via a neodymium organic framework (Nd-MOFs)-grafted TEMPO-oxidized cellulose nanofibrils (tCNF) using a solvothermal reaction. Not using the traditional down-conversion visible emissions of anti-counterfeiting techniques, this Nd-nanopaper achieved down-conversion near-infrared (NIR) and up-conversion visible emissions. The down-conversion luminescent property of these Nd-nanopapers exhibited characteristic NIR luminescence ( λ Em = 1080 nm) of Nd 3+ ions with 311 nm excitation, undergoing an “antenna” effect. In contrast, the up-conversion visible light emission ( λ Em =450 nm) of Nd-nanopaper was detected under 580 nm excitation. The mechanism of up-conversion fluorescence was ascribed to excited-state absorption and energy transfer up-conversion. Interestingly, Nd-nanopaper induced both up and down-conversions for visible and NIR emissions that were completely devoid of the interference from fluorescent brighteners and background fluorescence. These switchable up and down-conversion fluorescent Nd-nanopapers with visible and NIR dual emissions or dual channels could be applied in high level anti-counterfeiting applications.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Ruihui Wu,Ronghao Liu,Xiaoxia Liu,Jianwei Zhang,Wenfeng Xue,Yanzhao Yang
The recovery of Nd(III) from NdFeB permanent magnets is gaining increasing attention. In the rare earth elements separation industry, wastewater produced through saponification has become a serious environmental problem. In this work, a novel non-saponification P350-N235 synergistic extraction system was established for the extraction of Nd(III) from nitric acid medium. Almost 100% of Nd(III) was extracted by using a P350-N235 system when the molar fraction (X) of P350 was 0.3. And the synergistic enhancement factor R max reached 60.03. Firstly, the effects of time, pH, volume ratio and other variables were investigated to determine the extraction behaviors. Response surface methodology (RSM) was used to optimize the extraction conditions. The mechanism of synergistic extraction was investigated by FT-IR, UV–vis, NMR methods and ESP maps, indicating that the composition of the extracted complex was Nd(NO 3 ) 3 ·(P350) 2.5 (N235) 2.5 . Then, the extraction thermodynamics and kinetics were also thoroughly investigated, the extraction process is demonstrated to be a spontaneously exothermic reaction. In the NdFeB leaching solution, the synergistic system showed excellent separation factor (β) for Nd/Sm (1.43), Nd/Gd (7.33), and Nd/Dy (9.81). Finally, after 5 cycles, the P350-N235 synergistic system maintained high extraction efficiency. In conclusion, this study overcame the saponification problem in traditional extraction techniques and proposed an environmentally friendly green extraction system.
研究领域:
环境科学
·
化学工程
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材料科学
·
稀土元素分离
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yuezhou Wei,Khalid A.M. Salih,Kamal Rabie,Khalid Z. Elwakeel,Yasser E. Zayed,Mohammed F. Hamza,Eric Guibal
Alginate-PEI beads are functionalized by phosphorylation and applied for the sorption of Nd(III) and Mo(VI). The successful grafting of phosphoryl groups (as tributyl phosphate derivative) is characterized by FTIR and XPS analysis, elemental analysis, titration (pH PZC ), TGA, BET and SEM-EDX analyses. The multi-functional characteristics of the sorbent (i.e., carboxylic, hydroxyl, amine and phosphate groups) contribute in the binding of metal ions having different physicochemical behaviors. The sorption of Nd(III) is strongly increased by phosphorylation, while for Mo(VI) the enhancement is rather limited. Optimum sorption occurs at pH 3–4: maximum sorption capacity reaches up to 1.46 mmol Nd(III) g −1 and 2.09 mmol Mo(VI) g −1 ; sorption isotherms are fitted by the Langmuir equation. The equilibrium is reached within 30–40 min and the kinetic profiles are simulated by the pseudo-first order rate equation. The coefficients of the effective diffusivity are close to the self-diffusivity of Nd(III) and Mo(VI) in water; as a confirmation of the limited impact of resistance to intraparticle diffusion in the kinetic control. The sorbent is selective for Nd(III) over Mo(VI) and other alkali-earth or base metals (at pH close to 2.5–3). Metals can be readily desorbed using 0.2 M HCl/0.5 M CaCl 2 as the eluent. The loss in sorption does not exceed 5% at the fifth cycle, while desorption remains complete. A series of treatments (including acidic leachate, cementation, precipitation, sorption and elution) is successfully applied for the recovery of rare earths from Egyptian ore; with enrichment in the oxalate precipitate of Nd(III), Gd(III), Sm(III) and Eu(III).
研究领域:
环境科学
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材料科学
·
化学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 32
·15628-15634
·
IF 3.925
Yuzhe Zhang,Jie Hua,Hao Wu,Yizi Shao,Peiyang Gu,Zhongyu Li
The separation and recovery of neodymium from industrial pollutants and environmental sewage has become a problem of concern. However, there are still several difficulties in the practical treatment process including low pH values, low concentrations of rare earth elements, and coexistence of multiple trivalent ions, which are long-term challenges for neodymium recovery. In this paper, the synthesis of a composite membrane prepared using chitosan as an efficient adsorbent for Nd3+ is reported. The introduction of polyethylenimine into the composite membrane provided abundant protonated amino nitrogen atoms and endowed the composite membrane with excellent buffering capacity under extremely acidic conditions. Carbon nanofiber aerogels in the composite membrane can effectively improve the specific surface area and mechanical properties. Moreover, the introduction of ion imprinting technology can effectively improve the specific adsorption of Nd3+ on the composite membrane, which makes the composite membrane able to easily separate Nd3+ from other coexisting ions. The adsorption capacity of single metal adsorption for Nd3+ is 43.63 mg g−1. The composite membrane also showed good reusability, and the regeneration efficiency reached 86% after 5 cycles. The results show that the composite membrane can be used for the separation and enrichment of Nd3+ in solution.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
OPTICS COMMUNICATIONS
·
2014
·
IF 1.542
Li Hu,Jinli Zhang,Qiang Yin,Peijie Li,Kai Du
Nd(bfa) 3 (TPPO) 2 , Nd(tta) 3 (TPPO) 2 and Nd(β-nta) 3 (TPPO) 2 (bfa: 4,4,4-Trifluoro-1-phenyl-1,3-butanedione, tta: 4,4,4-Trifluoro-1-(2-thienyl)-1,3-butanedione, β-nta: 4,4,4-Trifluoro-1-naphthyl-1,3-butanedione, TPPO: triphenylphosphine oxide), three kinds of Nd(III) ternary complexes, were synthesized using β-diketonates and triphenylphosphine oxide as ligands. Fluorescence properties (including excitation spectra, emission spectra , emission lifetime, quantum yield, etc.) and thermal stabilities of the complexes were studied. Nd(tta) 3 (TPPO) 2 having the sharpest emission band, highest relative emission intensity and shortest fluorescence lifetime shows that it will be a kind of promising material for applications in near infrared immunoassay, laser active medium and optical fibers .
研究领域:
化学
·
光学
·
材料科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Zhenfeng Xiong,Ying Huang,Nan Li,Chaozhi Zhang,Yonghua Li,Zhuo Yang,Weidong Zhou,Kemei Zhou,Rong Zha,Changdong Sheng
Recovery of rare-earth elements (REEs), especially those of Dy and Nd, from Nd–Fe–B permanent magnets is crucial for sustainable development. Herein, an unsymmetrical pentanediamide extractant, N,N′-dimethyl-N,N′-didecyl-3-oxapentanediamide (DMDDOPDA), was synthesized and characterized for the effective extraction of Dy(III) and Nd(III). DMDDOPDA can form coordination bonds with metal ions because of the strong electron-donating abilities of the N and O atoms. The coordination sites might be inclined toward one side during the extraction. DMDDOPDA exhibited superior extraction performance in the HNO3 system than it did in the HCl system. The highest extraction efficiencies of Dy(III) and Nd(III) under optimal conditions were 99.9% and 99.5%, respectively, while their optimum stripping efficiencies were 100% and 85.3%, respectively. DMDDOPDA extraction of Dy(III) and Nd(III) in the four investigated diluents involved the formation of a neutral coordination complex. This study provides new insights into REE extraction using pentanediamide extractants.
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
·
2023
·
IF 8.6
Yuzhe Zhang,Zhenhao Fan,Jie Hua,Xin Gao,Liwei Lin,Zhongyu Li
Neodymium is a crucial strategic resource, which requires enhanced adsorption and recovery methods. Various researchers have utilized chitosan as an adsorbent for neodymium element adsorption. However, the low surface negative charge of the chitosan adsorbent affects its adsorption efficiency, and its inadequate mechanical properties hinder reusability. To address these issues, this study developed two composite membranes: the 3D wood imprinted carboxylated chitosan composite membrane (3DW-ICNTs/COOH/CS) and the 3D wood carboxylated chitosan composite membrane (3DW-CNTs/COOH/CS) for the separation and recovery of rare earth Nd(III). Kinetic experimental results indicate that both composite membranes reached 80% of maximum adsorption capacity within 200 min, indicating the significant negative charge on the surface of the carboxylated carbon nanotube-modified chitosan material. Even after ten adsorption and desorption cycles, imprinted composite membranes maintained a removal rate of about 80%. The utilizing delignified wood as a support material preserved the mechanical properties of the composite membrane, thereby providing a favorable condition for its industrial application.
研究领域:
材料科学
·
环境工程
·
化学工程
·
高分子科学
·
纳米技术
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 9
·5571-5582
·
IF 3.917
Zheng Xudong,Zhang Yi,Bian Tingting,Wang Dandan,Li Zhongyu
Previously, we investigated imprinted silica films templated by cellulose nanocrystals for the selective adsorption of rare earth ions from acidic systems, but the cost of organosilane limits the application of silica film adsorbents. Considering the cost and outstanding properties of cellulose, converting this renewable biological resource into an adsorbent material is a vital step towards sustainable development. One-step fabrication of imprinted mesoporous cellulose nanocrystals films (IMCFs) was implemented via ionic imprinting technology and they were applied to efficiently and selectively separate neodymium ions [Nd(III)]. Transmission photographs clearly demonstrated there is a highly ordered mesoporous structure after removal of silicon source. Nitrogen adsorption measurements showed two obtained materials possess high specific surface area, providing a good premise for efficient separation. When employed as absorbents, the maximum adsorption capacity of IMCFs is almost three folds than that of NIMCFs, reaching 18.22 mg g −1 . The distribution coefficient of IMCFs for Nd(III) reached 435.46 mL g −1 , much higher than other interfering ions. Repeatability tests showed IMCFs retained 81.55% of initial adsorption capacity after five adsorption cycles. In summary, this work presents a new avenue to construct imprinted mesoporous cellulose nanocrystals films for separation of rare earth ions.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）