JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 6
·1869-1881
·
IF 1.6
Zhang Na,Yang Miao,Zhang Manman,Du Jifu,Bao Qiburi,Zhao Long,Dong Zhen
Amphiphilic double poly(imidazole ionic liquid) grafted silica (SMIL-n) was prepared by radiation grafting of hydrophilic 1-vinyl-3-ethylimidazolium bromide and hydrophobic 1-vinyl-3-octylimidazolium bromide at different ratio onto silica. The adsorption behavior of SMIL-n was investigated. The adsorption equilibrium could reach less than 45 min, and their adsorption capacity were 152–171 mg/g obtained from Langmuir model. The selectivity of SMIL-n to ReO 4 − increased with the increasing content of hydrophobic ionic liquid. SMIL-n displayed good reusability, excellent acid resistance and irradiation resistance. Particularly, SMIL-n showed promising for ReO 4 − uptake from simulated contaminated Beishan groundwater and radioactive wastewater.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 18
·e53802
·
IF 3
Xiaoyu Meng,Qiwang Peng,Jihong Wen,Kai Song,Luman Peng,Tianyu Wu,Chuanbo Cong,Haimu Ye,Qiong Zhou
In vanadium redox flow battery (VRFB). Sulfonated poly(ether ether ketone) (SPEEK) is viewed as a promising alternative to Nafion as a material for vanadium liquid flow battery membrane, due to its low cost and high proton conductivity. However, SPEEK membranes have a Trade-Off effect of proton conduction and ion selectivity, which limits the performance of VRFB. Here, we exploited the Donnan effect of imidazole cations in ionic liquids (ILs) to improve the ion selectivity of SPEEK membrane. In addition, used porous covalent organic framework materials (COF) with sulfonic acid functional groups to immobilize ionic liquids, which reduced the loss of ILs. The ion selectivity of the SPEEK membrane was further improved. As a result, the cell performance of the composite membrane is improved. At a constant current density of 40 mA cm −2 , SPEEK/IL-5@TpPa-SO 3 H-3 membrane exhibits high coulombic efficiencies (CE: 98.43%) and energy efficiencies (EE: 91.7%). Furthermore, the energy efficiency of the SPEEK/IL-5@TpPa-SO 3 H-3 membrane decreases only 2.1% after 60 charge/discharge cycles at 100 mA cm −2 . Our work proposed a cost-effective, high-performance membrane for VRFB.
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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Fan Xu,Haolin Li,Bingyu Tian,Kun Cui,Rui Dong,Mingjin Fan,Meirong Cai,Feng Zhou,Weimin Liu
Owing to the green, high-performance, and application-specific work conditions, water-based lubricating systems show unlimited potential for chemical engineering development. The interfacial behavior of functional additives in aqueous systems is complex and variable due to polarity and interfacial activity, thus showing important research significance. Herein, five novel ionic liquids were synthesized; their unique interfacial behavior in the polar water system contributes a lot to the advanced corrosion resistance and the improved extreme pressure-bearing capacity. The polar groups in the molecular structure of ionic liquids can adsorb preferentially in competition with water molecules, resulting in the formation of an adsorption layer with a high elastic modulus on the metal surface. Benefiting from the tribochemical reaction and the strong polar adsorption effect, the tribofilm at the sliding asperity exhibited effective antiscuffing and antiwear performance. Moreover, their characteristic cationic groups enrich the driving force of the molecular self-assembly process and enhance the ability to form ordered molecular aggregates, whose behavior in an aqueous system facilitates super-robust lubricity. This work can promote the in-depth understanding, future design, and optimization of the aqueous lubricating system, providing content enrichment and expansion for the lubrication technology for harsh service conditions.
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Sustainability
·
2023
·Vol. 15
·期 4
·3103
·
IF 3.9
Lei Guo,Yue Huang,Yundong Wu,Wei Shi,Faheem Abbas,Yuanhua Lin,Riadh Marzouki,Xingwen Zheng
The corrosion inhibition performance of a quaternary phosphonium-based ionic liquid, i.e., hexadecyltriphenylphosphonium bromide (HPP), on mild steel in 1 M HCl solution was investigated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) methods. The surface characterization of mild steel was examined by scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS). The results revealed that the inhibition efficiency increases with its increasing concentration, and it can reach up to 99.1% at the concentration of 0.07 mM HPP. PDP data showed that the absorption of HPP conformed to Langmuir adsorption, which served as a mixed-type inhibitor, involving chemisorption and physisorption. SEM analysis confirmed the formation of barrier film on the metal surface, inhibiting the acid attack. Moreover, density functional theory (DFT) calculations and molecular dynamics (MD) simulations were conducted to elucidate the adsorption mechanism of inhibitor molecules on the mild steel surface. A match between the experimental and theoretical findings was evidenced.
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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Yunlong Yang,Yuanlong Guo,Chengtao Gao,Michael North,Jili Yuan,Haibo Xie,Qiang Zheng
Cellulosic poly(ionic liquid)s ([Cellmim][Br]) with a degree of substitution (DS) in the range of 0.32–0.89 were synthesized successfully via the homogeneous transesterification reaction of cellulose with 1-(2-methoxyacetyl)-3-methyl imidazole bromide IL ([Mmim][Br]) in a DBU/DMSO/CO2 solvent system. The structure and properties of these novel materials have been fully characterized. Cellulosic poly(ionic liquid) POF polymers (POF-[Cellmim][Br]) were then obtained by an in situ crosslinking reaction without adding an exterior catalyst. The porosity and properties of the POF-[Cellmim][Br] materials can be modulated. The POF-[Cellmim][Br] materials functioned as green, efficient, and highly active catalysts for cycloaddition reactions of epoxides and carbon dioxide under solvent-free and co-catalyst-free conditions. These reactions gave high yields (up to 97%), and the catalyst can be easily separated with excellent reusability and no significant change to its structure. A plausible reaction mechanism for the cycloaddition reaction of epoxide and carbon dioxide by the POF-[Cellmim][Br] catalyst is proposed based on the experimental results. This work provided a new strategy to prepare cellulosic-PIL POF materials and offered a platform to understand the cooperative effects of porous properties and nucleophilic anions on the cycloaddition reaction of carbon dioxide and epoxides.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Yan Li,Ying Dai,Wei Dai,Feiqiang He,Zhuyao Li,Xing Zhong,Qinqin Tao
Uranium and thorium of symbiotic relationship commonly appear in one kind of raw or spent ore. The simultaneous enrichment toward both metals in the first step is essential during many hydrometallurgy processing. Therefore bifunctional solid-state ionic liquid supported amidoxime chitosan (ACS) adsorbents were developed to simultaneously adsorb the two metal from the aqueous solution. The adsorption capacity of the bifunctional adsorbents toward uranium and thorium were significantly superior to the ionic liquid-free amidoxime chitosan, obviously proving the synergistic effect. For both uranium and thorium, the adsorption capacity in the consequence of ACS-[N 4444 ][DEHP], ACS-[N 4444 ][EHEHP], ACS-[N 1888 ][DEHP] and ACS-[N 1888 ][EHEHP] prove the steric effect and P O bonding played important roles in the adsorption. Study on isotherms and kinetics demonstrated the adsorption of ionic liquid-ACS adopted monolayer and chemical way. The Δ G o of very small negative values highlighted ionic liquid-ACS were prone to adsorb uranium and thorium. The study showed feasibility of bifunctional solid-state ionic liquid supported amidoxime chitosan adsorbents for Th(IV) and U(VI).
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GREEN CHEMISTRY
·
2023
·Vol. 25
·期 19
·7743-7755
·
IF 9.8
Bihua Chen,Shiguo Zhang,Yan Zhang
Developing a simple and efficient heterogeneous catalyst for the cycloaddition of epoxides with CO2 under atmospheric pressure and cocatalyst-/metal-/solvent-free conditions remains a great challenge. Herein, poly(ionic liquid)s (P-[VRIm]Br-crosslinker-x) with unique adsorption-swelling ability toward epoxides are designed and facilely synthesized via free radical polymerization in water. The adsorption-swelling of epoxides by P-[VRIm]Br-crosslinker-x is controllable, reversible, and widespread, resulting from the strong interactions between the poly(ionic liquid)s and epoxide molecules, especially the hydrogen-bonding interaction. Superior CO2 cycloaddition is realized in the P-[VRIm]Br-crosslinker-x catalyst through the adsorption-swelling effect. Specifically, P-[VC6Im]Br-C8-5% with 54.1 mmol g−1 adsorption-swelling ability toward styrene oxide achieves 89.3% yield and >99% selectivity in the cycloaddition of styrene oxide with CO2 to styrene carbonate under mild conditions (1 atm, 80 °C) without cocatalyst/metal/solvent consumption. Moreover, P-[VC6Im]Br-C8-5% can be easily recovered by deswelling, and shows good reusability and stability after five cycles for a total of 180 h. The adsorption-swelling property of P-[VRIm]Br-crosslinker-x to epoxides not only prompts the active centers to be fully exposed to the reactants but also induces the enrichment of epoxides during the whole catalytic process, thus accelerating the CO2 cycloaddition reaction rate. This work furnishes new insights for improving the activity of CO2 cycloaddition and would guide the design of efficient poly(ionic liquid) catalysts for atmospheric CO2 conversion.
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Reaction Chemistry & Engineering
·
2023
·Vol. 8
·期 12
·3124-3132
·
IF 3.9
Chenhua Shu,Min Zhao,Hua Cheng,Yajie Deng,Pierre Stiernet,Niklas Hedin,Jiayin Yuan
A type-III porous liquid based on zeolitic imidazolate framework-8 (ZIF-8) and an ionic liquid trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl)imide ([THTDP][BTI]) was synthesized and used for the desulfurization of model diesel. The desulfurization effect by ZIF-8/[THTDP][BTI] combined both the adsorptive desulfurization by ZIF-8 and the extraction desulfurization by [THTDP][BTI]. The removal of the three chosen aromatic organic sulfides by the ZIF-8/[THTDP][BTI] porous liquid followed the order of dibenzothiophene (73.1%) > benzothiophene (70.0%) > thiophene (61.5%). It was further found that deep desulfurization could be realized by ZIF-8/[THTDP][BTI] through triple desulfurization cycles and ZIF-8/[THTDP][BTI] can be regenerated readily. The desulfurization mechanism was explored further in detail by conformation search and density functional theory calculations. Calculations supported that the large molecular volume of [THTDP][BTI] excluded itself from the cavities of ZIF-8, making the pores of ZIF-8 in the porous liquid unoccupied and accessible by other guest species, here the studied organic sulfides. These calculations indicate that the van der Waals interactions were the main interactions between ZIF-8/[THTDP][BTI] and specifically benzothiophene. This work supports that the porous liquid ZIF-8/[THTDP][BTI] could potentially be used for desulfurization of diesel in industry.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Ximan Bu,Linlin Wu,Xiaofeng Ma,Wenjing Diao,Duyou Lu
It remains challenging to develop hydrogel electrolyte with integrated superior mechanical properties and ionic conductivity for high performance flexible supercapacitors. Herein, copolymer hydrogels are prepared via a one-step polymerization of acrylamide (AM), 3-(1-vinyl-3-imidazolio) propanesulfonate (VIPS) zwitterionic monomer and 3-sulfopropyl methacrylate potassium salt anionic monomer (SPMA). On one hand, the ionic interaction as reversible “sacrificial bonds” provided by VIPS and SPMA through SO 3 −—H 3 N+ makes these hydrogels tough (fracture energy 3.8 MJ m −3 ), stretchable (fracture strain 5100%), flexible and self-recoverable (~98% recovery efficiency after 1000% strain deformed). On the other hand, high ionic conductivity (3.1 S m −1 ) is achieved due to the efficient ion migration channels derived from the zwitterionic copolymer with high hydration capacity. Based on this hydrogel, the as-prepared flexible supercapacitor not only exhibits high discharge capacitance of 108.8 F g -1 at 1 A g -1 , and retains ~99% of its capacitance after 1000 cycles, but also achieves encouraging performance at subzero temperature due to the prevention of ice formation by zwitterionic polymer. This hydrogel can be easily functionalized with ionic liquid or other functional materials to extend their practical application.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Rui Chen,Xianzhao Zhang,Fengmao Liu,Chengcheng Liu,Qingrong Peng,Xiaoqiang Qiao
Conductor-like screening model for realistic solvents (COSMO-RS) theoretical chemical model is an effective tool for predicting the thermodynamic properties of solvents. In this study, 144 ionic liquids (ILs) were designed and screened by COSMO-RS with affinity interactions with benzimidazoles (BZDs) as the target. Ionic liquid-based magnetic nanoparticles (IL-MNPs, Fe 3 O 4 @SiO 2 @MAPs@PIL-POSS) were prepared by the selected diene ILs (1-allyl-3-vinylimidazolium chloride [Avim]Cl) and polyhedral oligomeric silsesquioxane (POSS) coating Fe 3 O 4 by free radical polymerization. As the adsorbent, the Fe 3 O 4 @SiO 2 @MAPs@PIL-POSS has great magnetic recovery ability and excellent specific adsorption ability for BZDs. The magnetic dispersive solid-phase extraction (MDSPE) of BZDs was established by optimizing the adsorption and desorption parameters. It is worth noting that the sample pretreatment only took 5 min. Combined with HPLC-MS/MS, a trace detection method for 7 trace BZDs in human plasma was established. In the method validation, the recoveries ranged from 79 % to 99 %, with relative standard deviations (RSDs) of 1.8 % to 8.8 %. The linear range were 1–1,000 μg/L. As a representative BZD, the adsorption kinetics and thermodynamic behavior of carbendazim on Fe 3 O 4 @SiO 2 @MAPs@PIL-POSS were analyzed to verify the adsorption mechanism, which is consistent with the results of IL screened by COSMO-RS. Therefore, it is feasible to theoretically screen IL and design IL-MNPs as specific adsorption materials. Furthermore, the theoretical design of MDSPE methods for target molecules has potential.
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Journal of Food Measurement and Characterization
·
2022
·Vol. 17
·期 2
·1228-1240
·
IF 3.006
Hou Wanchao,Liu Chunming,Li Sainan,Niu Huazhou,Liu Zhen,Zhang Yuchi,Jin Yongri,Li Xuwen
Compounds extracted from Ganoderma atrum ( G. atrum ) is significantly beneficial to human health, have been incorporated in numerous remedies owing to their brain and kidney health benefits and antiinflammatory and diuretic properties. G. atrum a pilot of homology of medicine and food, has an important development value of functional food and health food. In this study, to develop a new ionic-liquid-based ultrasound-assisted extraction method and bio-affinity ultrafiltration coupled with LC and MS. Moreover, molecular docking was used to evaluate the activity of the AChE inhibitors, which were subsequently isolated and purified using consecutive counter-current chromatography (CCC) and semi-preparative high-performance liquid chromatography (HPLC). Lastly, the active compounds were identified using MS and nuclear magnetic resonance. Four AChE inhibitors, viz . ergosterol, ergosta-7,22-dien-3-one, ergosta-7-en-3 β -ol, and ergosta-4,6,8(14),22-tetraen-3-one with purities of 92.23%, 90.19%, 90.52% and 96.72%, respectively, were obtained from G. atrum using consecutive CCC (ethyl acetate/methanol/water, 4.0:1.0:7.0, v/v/v ) coupled with semi-preparative HPLC (4% A (0–30 min), 4–100% A (30–40 min)). Our results suggested that G. atrum extracts can be used in the potential prevention and treatment of neurodegenerative diseases. It will help to elucidate the mechanisms of action of various medicinal plants at the molecular level and provide more opportunities to discover and develop new potential therapeutic remedies from health care food resources.
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Analytical Methods
·
2022
·Vol. 14
·期 46
·4775-4783
·
IF 3.532
Yuan Tao,Luyao Jia,Honglin Qin,Ruiting Niu,Lizhen Qiao
In this study, a new magnetic ionic liquid (MIL) was designed and prepared, containing a magnetic cation from the ligand N,N-dimethyl biguanide (DMBG) complexing with magnetic center Co2+ and a bis-trifluoromethanesulfonimide (NTf2−) anion. Using the MIL as the extraction solvent, a salting-out assisted dispersive liquid–liquid microextraction (SA-DLLME) combined with high performance liquid chromatography-ultraviolet detection (HPLC-UV) was established for the enrichment and detection of four parabens in environmental water samples. The one-factor-at-a-time experiment was employed to optimize the conditions affecting the extraction efficiency. Under the optimized extraction conditions, the limits of quantification (LOQs) of the four target analytes ranged from 2.0 ng mL−1 to 2.8 ng mL−1, and the coefficients of determination (R2) were above 0.9996 in the linear range of 2.8–400 ng mL−1. On the other hand, the method displayed good repeatability and accuracy with intra-day and inter-day relative standard deviations (RSDs) of 2.1–13.0% and recoveries of 82.0–114.6%. The established method was applied to real samples with recoveries within 81.6–125.4%, and the results demonstrated that the method was practical.
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