SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Yao He,Liangang Zhuo,Sha Deng,Zeng Huang,Zhen Qin,Xiang Xie,Ruijie Deng,Yuchuan Yang
Replacing conventional solvents by ionic liquids is a promising route to greener nuclear fuel cycles. Here, we report a unique multi-functional task-specific ionic liquid (TSIL) for the extraction and separation of trace thorium (Th). The phosphoramidate substituted butyl groups to imidazolium ionic liquid (PN-TSIL) shows superior extraction ability and selectivity (distribution rations of Th ~ 8302 and separation factor of Th to uranium (U) ~ 793 at 2 mol/L HNO 3 ). For industial application purpose, an extraction chromatographic resin perpared by PN-TSIL (called PN-TSIL Resin) was made to develop a rapid, highly specific separation technique for simulative 229 Th/ 233 U separation process. Moreover, combination of spectroscopic investigations, quantum-mechanical calculations and thermodynamic parameters mearsurment, an unprecedented resolution picture of extraction process was delineated. The extraction ability and selectivity of thorium could be explained by the multiple binding sites though hybrid interactions (coordination and hydrogen bond) between thorium and PN-TSIL, leading to an entropy-driven extraction process. The understanding of solvent extraction mechanism in molecular scale will inspire new ways for TSIL design for nuclear fuel cycles.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Kaihang Zhang,David Kujawski,Chris Spurrell,Dong Wang,Junchen Yan,John C. Crittenden
Polyfluoroalkyl Substances (PFAS) such as perfluorooctanoic acid (PFOA) are resistant to biodegradation leading to adverse health outcomes. Therefore, PFAS removal from drinking water is paramount. Liquid-liquid extraction processes can remove them from water; however, the hydrophobic and oleophobic properties of PFOA lead to the low extraction efficiency and severe emulsification , especially for the ppm-levels concentration of PFOA. Therefore, we introduced ionic liquid (IL) methyltrioctylammonium bis(trifluoromethylsulfonyl)imide ([A336][NTf 2 ]) as extractant into octanol. We found that using hexadecyl trimethyl ammonium bromide (CTAB) as an extractant caused severe and stable emulsion. In comparison, [A336][NTf 2 ] could suppress the emulsification with high extraction efficiency. The extraction performance of PFOA was examined as a function of various parameters. The results showed that the extraction efficiency was strongly dependent on the concentration of IL and aqueous pH. Further research revealed the extraction mechanisms at the molecular-level, and density functional theory (DFT) and molecular dynamic (MD) simulation agreed with the trends in the experiment. We determined that the extraction efficiency of PFOA from water could be up to 88.21 wt% for the optimized condition, indicating that the extraction system of [A336][NTf 2 ] + octanol was efficient for separating PFOA from the diluted aqueous solution.
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DOI
PubMed
高影响因子
Green Energy & Environment
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2020
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IF 6.395
Lili Jiang,Ke Mei,Kaihong Chen,Rina Dao,Haoran Li,Congmin Wang
An efficient method for prediction in the capture of SO 2 from flue gas by imidazolium ionic liquids was reported, where the concentration of SO 2 is 2000 ppm. On the basis of quantitative calculations through a combination of Langmuir simulation, theoretical calculation and quantum chemical method, SO 2 absorption and desorption performance from flue gas by twelve kinds of imidazolium ionic liquids with different anions were designed and predicted. Then, among them, five kinds of imidazolium ionic liquids were chosen and prepared to investigate their behavior of SO 2 absorption capacity , desorption residue, and available absorption capacity. The results indicated that the experimental values were in good agreement with the predicted values. Thus, an ideal ionic liquid [Emim][Tetz] was obtained through the predictive method for the capture of SO 2 of 2000 ppm, which showed high available absorption capacity of 0.24 g SO 2 per g ionic liquid and excellent reversibility .
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Jifang Fu,Yufeng Xu,Linna Dong,Liya Chen,Qi Lu,Mengmeng Li,Xingfa Zeng,Sanwei Dai,Guorong Chen,Liyi Shi
In this work, we have successfully synthesized a series of multiclaw-shaped octasilsesquioxanes functionalized ionic liquids and then used it developing novel hybrid solid polymer electrolytes (SPEs) with high room temperature ionic conductivity. The effect of POSS ionic liquids with varying chain in imidazole on the microstructures, thermal stabilities and electrochemical properties of the obtained SPEs were studied. The scanning electron microscope images of SPEs membranes confirm that the POSS ionic liquids were uniformly distributed in the polymer matrix. The solid polymer electrolytes exhibit high electrochemical stabilities with a wide electrochemical window up to 5.0 V, a lithium-ion transference number ( t Li+ ) of 0.32 and high ionic conductivity of 3.06 × 10 −4 S cm −1 at 22 °C. Moreover, the Li/LiFePO 4 cells containing POSS-ILs-SPEs exhibit excellent cycling performance and rate capability, the initial discharge capacity is 150.7 mAh g −1 and initial coulombic efficiency is 100% at a rate of 0.1C. The capacity of the cells can reach to 130 mAh g −1 and the coulombic efficiency is 99.9% after 90 cycles.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2020
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IF 7.632
Jinyi Chen,Meichen Li,Mantian Li,Xiaocheng Lin,Ting Qiu
Unusual self-solidifying tris(2,4,6-trimethoxyphenyl)phosphonium-containing ionic liquids were synthesized for biodiesel production via the catalytic esterification of a variety of free fatty acids. These ionic liquids were synthesized by a two-step method involving the reaction between tris(2,4,6-trimethoxyphenyl)phosphine and 1,3-propanesulfonate to form a TTMPP-PS zwitterion followed by acidification with different acids. The obtained solid-state ionic liquids were soluble during the reaction to conduct homogeneous catalysis and precipitated after the reaction, which was followed by alcohol evaporation, indicating the great ease of heterogeneous recovery; therefore, the ionic liquids had the combined advantages of both homogeneous and heterogeneous catalysts. As a result, such ionic liquids show great potential for biodiesel production because of their pronounced activity, excellent stability, and recyclability.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2020
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IF 5.065
Ke Yuan,Shiyu Chen,Xuemei Chen,Shun Yao,Xuejiao Wang,Hang Song,Minghui Zhu
In recent years, the toxicity of Polygonum multiflorum has been attributed to the anthraquinones . Therefore, the selective removal of anthraquinones will effectively improve the safety of Polygonum multiflorum . An ionic liquid-based extraction was firstly proposed to selectively extract anthraquinones from herbal powders with ultrasonic assistance. The relationship between selective extraction effect and important extraction conditions was investigated. Furthermore, the mechanism of the selective extraction was explored with the extraction kinetics and computation method. In addition, the recovery of ionic liquids was also investigated. Finally, high extraction efficiency (97.2%) and good selectivity (7.32) for anthraquinones from Polygonum multiflorum were achieved, and the ionic liquid was recovered with satisfactory recovery rate. It could provide a promising alternative method to isolate anthraquinones from other natural products .
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高影响因子
ACS Sustainable Chemistry & Engineering
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2020
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IF 7.632
Ying Sun,Shuhang Ren,Yucui Hou,Kai Zhang,Qi Zhang,Weize Wu
A series of environmentally benign functional ionic liquids (ILs) based on l-proline as the anion to efficiently absorb low-concentration NO have been investigated in this work. The results indicate that the ILs with an l-proline anion have high absorption capacities for 0.16 vol % NO, reaching a maximum absorption capacity of 0.51 mol of NO per mol of IL at 30 °C and ambient pressure for l-proline choline IL ([Ch][l-Pro]). The absorbed NO could be recovered from [Ch][l-Pro], and the regenerated IL had no significant loss of NO absorption capacity for at least 7 recycles. We verified the mechanism through both experimental and theoretical methods. The results indicate that the absorption of NO in [Ch][l-Pro] mainly resulted from a chemical process—NO and the secondary amine group in the anion form a NONOate with a chemical formula [l-Pro]−–(NO)–NO. We believe that this efficient and reversible absorption of low-concentration NO by the ILs has potential as a new NO capture technique.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2020
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IF 7.183
Rui Zhao,Hong Wu,Leixin Yang,Yanxiong Ren,Yutao Liu,Zihan Qu,Yingzhen Wu,Li Cao,Zan Chen,Zhongyi Jiang
Development of high-performance membranes for biogas upgrading is an urgent demand for the application of membrane technology in the field of renewable energy. Covalent organic frameworks (COFs) exhibit promising potential in membrane-based separation for their highly ordered crystalline porous structure, total organic backbone and tailored functionality. However, the limited functional groups on frameworks and relatively larger pore size of existing COFs restrict further improvement in the separation efficiency especially for gas mixtures. This work reports a novel strategy for modifying the pore of COF-300 with imidazolium-based ionic liquid [bmim][Tf 2 N] by post-impregnation and then incorporate the composite particles IL@COF-300 into Pebax matrix to prepare mixed matrix membranes (MMMs). The IL decreases the pore size of COF-300 from 1.28 nm to 1.09 nm and increases the diffusion coefficient difference (D CO2 /D CH4 ) between CO 2 and CH 4 . Moreover, the presence of IL with high CO 2 solubility endows the COF-300 pores with CO 2 -facilitating ability and thus increasing the solubility difference (S CO2 /S CH4 ). The dual functions of IL lead to an enhanced separation performance of the resultant IL@COF-300/Pebax MMMs with an optimal permeability of 1601 Barrer and a CO 2 /CH 4 gas selectivity of ~39, i.e. 209% and 87% higher than the pristine Pebax membrane, respectively, breaking the trade-off between permeability and selectivity and surpassing the Robeson 2008 upper-bound. The membrane also exhibits superior long-term operation stability during two months.
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高影响因子
TRIBOLOGY INTERNATIONAL
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2021
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IF 4.872
Lili Zhu,Jun Dong,Qunfeng Zeng,Mianran Chao,Kuiliang Gong,Weimin Li,Xiaobo Wang
In this paper, a group of quaternary ammonium amino acid ionic liquids (QAAA ILs) prepared by coupling the tetrabutylammonium cation with fourteen types of natural amino acids as base lubricant were investigated for steel/steel, steel/copper and steel/aluminum contacts at ambient temperature and elevated temperature. The corrosion resistance and tribological ability of various QAAA ILs was determined. The influences of various anionic structures on kinematic viscosity , corrosivity , thermal stability and tribological properties of the ILs were discussed in detailed. The copper strip corrosion test results showed that the present ILs have been proved to be almost non-corrosive. Tribological behaviors results displayed that the present ILs exhibit extremely eminent friction reduction and antiwear properties. Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) analysis revealed that a protective lubricating film is formed on the surface of contact mainly through a polarity induced physical adsorption when QAAA ILs are selected as neat lubricants, which plays a key role in reducing friction and wear between the moving mechanical interface.
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高影响因子
APPLIED SURFACE SCIENCE
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2021
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IF 6.707
Pengyan Li,Li Liu,Weijia An,Huan Wang,Wenquan Cui
Photocatalytic CO 2 reduction is a potential way to address simultaneously environmental pollution and energy shortage. However, the difficulties of CO 2 activation and C C coupling lead to quite low conversion efficiency of CO 2 to C2 products. In this study, we constructed Cu 2 O/g-C 3 N 4 heterojunction for photocatalytic CO 2 reduction to ethanol by coupling thermal field and ionic liquids (ILs). The ethanol rate reached 0.71 mmol·g −1 ·h −1 over Cu 2 O/g-C 3 N 4 under photothermalcatalysis, which is 1.89 times that of photocatalysis and 7.05 times that of thermal catalysis. The temperature enhanced thermal motion of the radical, which promotes the formation of ethanol through the ·CH 3 dimerization. The 1-aminopropyl-3-methylimidazolium bromide ILs shows superior CO 2 reduction performance with a high current density (21.3 mA·cm −2 ) than KHCO 3 electrolyte (12.8 mA·cm −2 ). The overpotential is reduced by 0.34 V, which accelerates CO 2 reduction by reducing polarization. It is found that the ILs played a key role in suppressing H 2 O reduction and increasing ethanol yield in this photothermalcatalytic strategy.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Liang Wei,Ruifeng Guo,Yunqing Tang,Jiamin Zhu,Meiyang Liu,Jianqiu Chen,Yun Xu
Three kind of pure amines which have high solubility of CO 2 were used as absorbents hardly to be recovered. A series of aqueous ethoxyacetate anion-based protic ionic liquids (PILs) with three different amine cations were designed, and physical properties including measured density and viscosity were measured. Solubility of CO 2 in the three PILs solution, 90% [DMAPAH][EOAc], 90% [DEEDAH][EOAc] and 90% [DMEDAH][EOAc], were systematic determined at the range of 303.2–333.2 K under the pressure of 1.2 bar. Impressively, the solubility of CO 2 in 90% [DMAPAH][EOAc] reached up to 2.44 mol/kg, which showed more advantage than some traditional or functional ILs. The 90% [DMAPAH][EOAc] could be reused four times. Besides, the proposed mechanism was advised. Considering the advantages of high absorption capacity, low cost, easy regeneration including fast absorption rate, we believe the three PILs solution can be recommended as alternatives to some volatile organic amines to be applied in CO 2 capture.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2019
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IF 4.191
Yunchang Fan,Zeyu Niu,Chen Xu,Lei Yang,Feiyang Chen,He Zhang
Haematococcus pluvialis , a green microalga, can accumulate high level of astaxanthin which is regarded as a super antioxidant extensively used in cosmetics, poultry, food, and pharmaceutical industries. The difficult point for extraction of astaxanthin is how to break the thick resistant cell walls of Haematococcus pluvialis effectively. In this work, this difficulty was successfully solved by the biocompatible protic ionic liquids-based microwave-assisted liquid-solid extraction (PILs-MALSE). Ethanolammonium caproate (EAC), a PIL used in here, can strongly dissolve mannan, one of the main components of the cell walls of Haematococcus pluvialis , which can leave out the pretreatment process to disrupt the cell walls before extraction, thereby leading to fast extraction (extraction time, 50 s). Furthermore, EAC has the obvious advantages over the imidazolium-based ILs, such as low cost, easy synthesis, and excellent biocompatibility. The PILs-MALSE method is more effective for the extraction of astaxanthin compared with conventional extraction techniques.
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高影响因子
危险品化学品经营许可证（带存储）