JOURNAL OF MEMBRANE SCIENCE
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2023
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IF 9.5
Baoying Wang,Junying Yan,Huangying Wang,Ruirui Li,Rong Fu,Chenxiao Jiang,Victor Nikonenko,Natalia Pismenskaya,Yaoming Wang,Tongwen Xu
The development of low-resistance ion-exchange membranes enabling fast transport of large-sized metallic anions is extremely desirable for the treatment of metal containing effluents using electrodialysis (ED). Herein, mechanically stable ionic liquid-based pore-filling anion-exchange membranes (PFAEMs) with excellent transport performance for large-sized metallic anions were fabricated by impregnating porous polytetrafluoroethylene with ionic liquid (IL) tricapryl(methyl) ammonium chloride, poly(ethylene glycol) dimethacrylate and poly(vinylidene fluoride-co-hexafluoropropylene). The superior compatibility between the ILs and polymeric chains ensured the stable existence of quaternary ammonium groups, thus enabling fast metallic anion migration along the continuous pathway in the membrane matrix at a low current density. The prepared PFAEM exhibited a dramatically greater flux of HCrO 4 − (90.7 μmol m −2 s −1 ), which was 9.5 and 4.4 times higher than the flagship commercial Neosepta@ASE and Neosepta@AMX membranes, respectively. The area resistance of PFAEM (3.4 Ω cm 2 ) was found to be 3.4 and 2.0 times lower than those of the Neosepta@ASE and Neosepta@AMX membranes, respectively. Besides, the preeminent transport performance of PFAEM to other metal coordination anions revealed the universality of the prepared membrane. Moreover, the extremely high limiting current density and satisfactory long-term stability of PFAEM manifested bright prospects for realizing efficient metal separation in industrial-scale applications.
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高影响因子
DESALINATION
·
2022
·
IF 11.211
Ding Yu Xing,Qi Shen,Siyi Tao,Haojie Zeng,Wenyi Dong,Feiyun Sun
Most commercial nanofiltration (NF) membranes carry negative charges, which is unfavorable for rejecting positively charged impurities according to the Donnan effect . Two ionic liquids (ILs) with the same cation, namely 1-aminopropylimidazolium hexafluorophosphate ([C 3 NH 2 MIm]PF 6 ) and 1-aminopropyl-3-methylimidazolium bromide ([C 3 NH 2 MIm]Br), were employed to improve membrane surface charge by surface modification. With the ILs regulating the membrane structure, the resultant membranes (IL-PA) displayed a rough surface with higher hydrophilicity , larger pores, enhanced surface charge and structure stability than the blank PA membrane. Specifically, with IL concentration increasing, the [C 3 NH 2 MIm]PF 6 modified (PF6/PA) membranes showed enhanced isoelectric point (IEP) from 4.5 to 6.5, while that of the Br/PA membranes was decreased from 3.7 to 3.1. It indicates the anionic part of ILs determined its distribution in the PA layer. High P o/w of [C 3 NH 2 MIm]PF 6 enabled high diffusivity in the PA layer, and thus, more [C 3 NH 2 MIm] + grafted on the membrane surface, leading to high IEP and contact angle. Overall, the optimized 0.5PF6/PA membrane exhibited a high pure water flux of 62.2 L·m −2 ·h −1 and enhanced heavy metal removal efficiency (Cu 2+ 97.1 %, Ni 2+ 94.6 %, Cd 2+ 95.5 %, Zn 2+ 96.4 %). This work demonstrates the feasibility of specific functionalized ILs in heavy metal wastewater treatment .
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MICROPOROUS AND MESOPOROUS MATERIALS
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2023
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IF 5.2
Heshan Cai,Junji Chen,Kaixing Cai,Fei Liu,Tianxiang Zhao
A N-doped porous polymer with protonated ionic liquid sites was fabricated by a solvent-free self-assembly synthesis of resorcinol/formaldehyde resin, followed by modification with hydrobromic acid (HBr) to introduce ionic sites. Compared with the parent polymer PIP-HP, polymer PIP-HP-HBr maintains a high specific surface area after ion site construction, and the elevated activity was also acquired under metal/solvent/cocatalyst-free conditions with up to 99% yield of cyclic carbonates. Furthermore, the PIP-HP-HBr as a heterogeneous catalyst can be readily recovered and demonstrate excellent cycling stability. In addition, a plausible catalytic mechanism had been proposed that the high catalytic activity originates from the synergistic effect of hydrogen bond donor –OH and nucleophilic anion Br − .
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
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IF 3.898
Zhonghao Li,Yuanyuan Yang,Huanong Cheng,Yun Teng,Chao Li,Kangkang Li,Zhou Feng,Hongwei Jin,Xinshun Tan,Shiqing Zheng
The density and viscosity of ferric chloride/trioctylmethylammonium chloride ionic liquid ( r FeCl 3 /[A336]Cl) with different molar ratios ( r = 0.1–0.8) of FeCl 3 to [A336]Cl were measured at temperatures from 313.15 to 358.15 K and atmospheric pressure. The density and viscosity data were fitted by the relevant temperature variation equations, respectively. The variation of density and viscosity with temperature and r was obtained. The solubility of r FeCl 3 /[A336]Cl to H 2 S was measured at temperatures from 318.15 to 348.15 K and pressures from 0 to 150 kPa. The effects of temperature, pressure, and r on the solubility of H 2 S were discussed. The reaction equilibrium thermodynamic model (RETM) was used to fit the H 2 S solubility data, and the average relative error was less than 1.3%, indicating that the model can relate the solubility data well. And Henry's constant and chemical reaction equilibrium constant were obtained by the RETM fitting. The relationships of Henry's constant and chemical reaction equilibrium constant with temperature and r were analyzed.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Kun Wang,Guoquan Zhang,Mingzhi Luo,Jia Li
Spent Li-ion batteries (LIBs) pollute the environment and endanger human health; however, they are valuable mineral resources . Here, we designed an extraction system composed of 0.4 mol/L 2-thenoyltrifluoroacetone (HTTA), 0.4 mol/L trioctylphosphine oxide (TOPO), and ionic liquid (IL) 1-Butyl-3-MethylImidazolium bis (trifluoromethyl sulfonyl) imide to recover valuable metals from spent LIBs. Under the optimum conditions (O/A = 1/1, 25 °C, reaction time 20 min, and pH = 3.65, the pH of the solution does not need to be adjusted), over 99.54% of Co, 99.85% of Mn, and 99.68% of Ni were extracted, while only 2.84% of Li were coextracted. The ultraviolet spectrum analysis showed that the spectral peaks of the stripping solution changed at 266 and 293 nm, indicating that CH 3 COO – participated in the extraction reaction. Following stripping with sulfuric acid , the pH of the solution was adjusted with 2.0 mol/L NaOH, and approximately 99% of the Al 3+ ions were precipitated. Nickel and manganese sulphates were added to the stripping solution. The precursor was prepared using a coprecipitation method. The precursor was then mixed with lithium hydroxide and calcined at 1000 °C for 12 h to obtain LiNi 1/3 Co 1/3 Mn 1/3 O 2 .
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Jia Pang,Hongbin Wang,Caiyan Zhang,Weidong Fan,Yang Feng,Liting Yu,Lili Fan,Rongming Wang,Zixi Kang,Daofeng Sun
β-cyclodextrin (β-CD), with intrinsic nano-cavity, is a promising monomer to construct thin-film composite (TFC) membranes for molecular separations. Nevertheless, interfacially polymerize β-CD into continuous membranes is challenging due to the low reactivity of hydroxyl groups. To address this issue, in this work, ionic liquid (IL) has been introduced into the interfacial polymerization (IP) process of β-CD and trimesoyl chloride (TMC), forming high-quality TFC membranes for organic solvent nanofiltration (OSN). Investigations have been done into how IL effects membrane structure and separation performance. In contrast to traditional β-CD-TMC TFC membrane, the β-CD-IL-TMC TFC membrane possesses upgraded crosslinking, continuity, stability, and OSN separation property. The best β-CD-IL-TMC membrane has an ethanol permeance of up to 57.01 L m −2 h −1 MPa −1 and Naphthol green B rejection rate of 99.98% and can sustain a stable separation performance within 20-hour test, indicating the fabricated β-CD-IL-TMC membranes have advantage of separating and purifying organic solvent.
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DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Xiaodong Hu,Kelei Zhuo,Dong Sun,Quanzhou Du,Li Sun,Yujuan Chen,Guangyue Bai,Jianji Wang
Reasonable design of electrode materials to match ionic liquid electrolytes is important for the development of high-performance supercapacitors in the future. Herein, we demonstrate a nitrogen-doped agar-derived porous carbon (NAGC) electrode material with high specific capacitance and long cycling life, which was prepared using agar as precursor, potassium carbonate as activator, and melamine as nitrogen source via one-step activation doping method. The combined action of melamine and potassium carbonate can regulate and control the physical and electrochemical properties of the prepared materials. NAGC presents a high specific surface area (3228 m 2 /g) and micropores-dominated hierarchical porous structure , which can provide more adsorption sites and benefit rapid ions transport. The NAGC electrode in 1-ethyl-3-methylimidazolium tetrafluoroborate ([Emim][BF 4 ]) ionic liquid electrolyte has a specific capacitance of 183 F/g at 1 A/g and 91 % capacitance retention from 1 to 10 A/g. Additionally, the assembled device with NAGC as both positive and negative electrode material has a wide operating voltage (3.6 V) and high energy density of 70.2 Wh/kg at a power density of 1.81 kW/kg. Also, it possesses a capacitance retention of 83.3 % after 50,000 cycles. This work provides a simple and effective way to achieve porous carbon materials with high specific capacitance and long cycle life.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
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IF 4.598
Zhiwei Han,Haomin Jiang,Aiguo Xue,Gaoguo Ni,Yanzhi Sun,Yang Tang,Pingyu Wan,Yongmei Chen
Lignin valorization to obtain small aromatic compounds requires selective oxidation to break the linkage bonds among the C9 units in lignin molecules. It has been reported that hydrogen peroxide (H 2 O 2 ) generated through the oxygen reduction reaction (ORR) on the cathode could be an appropriate oxidizing reagent to depolymerize lignin, but the current efficiency was still unsatisfactory. In this study, a protic ionic liquid [Et 3 NH][HSO 4 ] is used as electrolyte instead of aqueous solution, and the generation rate of H 2 O 2 is determined as 0.0563 mmol cm −2 min −1 and the current efficiency of 79.7 % by the Ti-TPyP colorimetric method. Then using p -benzylethoxyphenol (PBP) as a lignin model compound, it is figured out that approximately-two molecules of H 2 O 2 are consumed for breaking one α-O-4 ether bond. Finally, in the electrolysis of an actual lignin sample, it is evaluated that about 19.4 molecules of H 2 O 2 are needed for producing one molecule of vanillin when taking vanillin as a representative degradation product of lignin.
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ACS Nano
·
2022
·
IF 18.027
Youyu Jia,Feng Shi,Hongying Li,Zhikun Yan,Jiwei Xu,Jiale Gao,Xiaoli Wu,Yifan Li,Jingtao Wang,Bing Zhang
Two-dimensional (2D) lamellar membranes, with highly ordered nanochannels between the adjacent layers, have revealed potential application prospects in various fields. To separate gases with similar kinetic diameters, intercalation of a functional liquid, especially an ionic liquid (IL), into 2D lamellar membranes is proved to be an efficient method due to the capacity of imparting solubility-based separation and sealing undesired defects. Stable immobilization of a high content of liquid is challenging but extremely required to achieve and maintain high separation performance. Herein, we describe the intercalation of a typical IL, 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]), into the ionized nanochannels of sulfonated MXene lamellar membranes, where the sulfonate groups are anchored onto MXene nanosheets through a facile method based on metal-catechol chelating chemistry. Thanks to the intrinsic benefits of MXene as building blocks and the decorated sulfonate groups, the optimal membrane possesses adequate interlayer spacing (∼1.8 nm) and high IL uptake (∼47 wt %) and therefore presents a CO2 permeance of 519 GPU and a CO2/N2 selectivity of 210, outperforming the previously reported liquid-immobilized lamellar membranes. Moreover, the IL loss rate of the membrane within 7 days at elevated pressure (5 bar) is measured to be significantly decreased (from 43.2 to 9.0 wt %) after growing sulfonate groups on the nanochannel walls, demonstrating the excellent IL storage stability.
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PubMed
高影响因子
Pharmaceutics
·
2022
·Vol. 14
·期 10
·2158
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IF 6.525
Degong Yang,Xuejun Chen,Ziqing Li,Chunrong Yang
Ionic liquids (ILs) have been proven to be an efficient technology for enhancing drug skin permeability. However, the question of whether the two components of ILs are released synchronously in transdermal preparations has remained unclear. Thus, this study aimed to investigate the release characteristics of two components of ILs and their underlying molecular mechanism. The ILs containing flurbiprofen (FLU) and lidocaine (LID) were synthesized and characterized. The four typical acrylates pressure sensitive adhesives (PSAs) with different functional groups were synthesized and characterized. The effects of PSAs on the release characteristics of two components of ILs were investigated by drug release tests and verified by skin permeation experiments. The action mechanisms were revealed by FTIR, Raman, dielectric spectrum, and molecular docking. The results showed that the average release amount of FLU (0.29 μmol/cm2) and LID (0.11 μmol/cm2) of ILs in the four PSAs was significantly different (p< 0.05), which illustrated that the two components did not release synchronously. The PSA−none and PSA−OH with low permittivity (7.37, 9.82) interacted with drugs mainly by dipole-dipole interactions and hydrogen bonds. The PSA−COOH and PSA−CONH2with high permittivity (11.19, 15.32) interacted with drugs mainly by ionic bonds and ionic hydrogen bonds. Thus, this study provides scientific guidance for the application of ILs in transdermal preparations.Keywords:transdermal patch;ionic liquids;release characteristics;hydrogen bond;ionic hydrogen bond
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PubMed
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Caixia Li,Bingtao Wang,Yong Yang,Juan Chai,Zhenghong Guo,Zhengping Fang,Peng Chen,Juan Li
Crystallinity and flame retardancy are two key properties for poly(lactic acid)(PLA) in applications. In this paper, a quaternary phosphonium salt poly(ionic liquid) (PIL) and a phosphamide (POFA) were prepared. The PIL, POFA and their blend were used to regulate the flame retardancy and crystallization behaviors of PLA using the limiting oxygen index, UL-94 vertical burning, and thermogravimetric analysis , and differential scanning calorimetry etc. The results showed that a synergistic effect exists between PIL and POFA on flame retardancy. When 6 wt% PIL/POFA (2/1) was added into PLA, its LOI value is 28.0 vol%, and achieves the UL-94 V-0 rating while the PLA composites containing 6 wt% PIL or POFA just achieve the UL-94 V2. The PIL/POFA improves the flame retardancy of PLA by melting-away mode. In addition, the crystallization rate of PLA containing PIL/POFA is faster than that of PLA/PIL and PLA/POFA. The degradation of PLA induced by PIL/POFA produces some small molecular oligomers, which enhances the molecular chain mobility and rearrangement, thus contributes to better flame retardancy and faster crystallization.
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PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Haiyan Du,Jinfeng Wang,Na Xu,Yunlong Yu,Shaoze Liu
Self-healable, shape memory poly(vinyl alcohol) (PVA)/ionic liquid (PVA/IL) hydrogels were assembled from poly(vinyl alcohol) and 1-butyl-3-methylimidazolium tetrafluoroborate solutions by a one-step strategy at room temperature. The gelation was due to the judicious design of the supermolecular interactions between PVA and IL, including electrostatic interactions and hydrogen bonding. Differential scanning calorimetry and tensile tests etc. were applied to study the effect of IL on the hydrogels. The results showed that the optimum thermal and mechanical properties of the hydrogel are obtained with higher IL content. The tensile strength and elongation at break of PVA/IL-1.00 hydrogel were 1.447 MPa and 750%, respectively. The self-healing efficiency reached up to 92.60%. Due to the reversible metal ion cooperation in ferric sulfate and the reduction of Fe 3+ in ascorbic acid, the hydrogels exhibited a redox-stimulated shape memory effect. The cytotoxicity test indicated the promising applications for biomedical materials including artificial skin and wound dressings.
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危险品化学品经营许可证（带存储）