TOPICS IN CATALYSIS
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2025
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IF 3
Du Qilong,Jiang Yuanguang,Fu Dandan,Yuan Kun,Nie Xuliang,Hou Dan,He Lu,Chen Jing,Wu Suqin,Xiong Wanming
Imidazolium-based hexafluorophosphate ionic liquids (ILs) have attracted widespread interest due to their unique physicochemical properties. Accordingly, in this work, four kinds of diimidazolium hexafluorophosphate ILs with different cation structures were synthesized and characterized. Moreover, their stability (e.g., thermal stability, oxidation-reduction stability, and acid-base stability), and catalytic performance in furfural coupling were systematically explored to elucidate the correlation between their physicochemical properties and cation structures. Thermal stability results showed no weight loss within 250 °C, and the cations in ILs with shorter R-groups or linked via an alkyl carbon chain correlated with better thermal stability. Moreover, the conventional oxidation-reduction stability of the ILs was not desirable, but they displayed promising electrochemical stability. Among them, the cations with longer R-groups or linked via the phenyl group were correlated with a wider window of electrochemical stability. Notably, they also displayed a correlation with better acid-base stability, and more resistance to alkaline environments (pH = 13) compared to acidic environments (pH = 1). Furthermore, ILs could also realize furfural coupling with a 60.48% furoin yield in an alkaline environment. Overall, the correlation between the cation structures of ILs and their physicochemical properties was revealed, and the ILs with longer R-groups or linked via the phenyl group displayed better prospects. This work may provide insights into the future design and application of ILs.
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ACS Applied Polymer Materials
·
2026
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IF 4.7
Guoliang Yang,Haohang Yuan,Bin Liu,Kaige Yan,Xinwei Wang,Shujuan Liu,Qian Ye,Weimin Liu
Marine biofouling imposes significant economic and ecological challenges to maritime activities. Hydrogels are considered effective antifouling materials owing to their highly hydrated surfaces. Herein, nanocomposite hydrogels incorporating ionic liquid-functionalized gallium-based liquid metal (IL-GLM) were successfully fabricated. The ionic liquid (VBBIm+Cl–) was grafted onto the surface of GLM through free radical polymerization, enhancing dispersibility and antifouling efficiency. The resulting IL-GLM microgels were embedded into an acrylic acid/acrylamide hydrogel matrix to form IL-GLM@gel nanocomposite coatings. These coatings exhibited superior antifouling activity and mechanical performance, arising from the synergistic effects of Ga3+ release and ionic liquid functionality. Notably, IL-GLM@gel achieved antibacterial and microalgae removal rates exceeding 95 and 85%, respectively, and an increase in tensile strength by 119% and elongation of break by 57%. This study demonstrates that IL-GLM@gel hydrogels hold strong potential as advanced antifouling coatings for marine applications.
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Separations
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2022
·Vol. 9
·期 12
·441
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IF 3.344
Xiaoman Li,Ruobing Qiao,Xuyang Jiu,Minglei Tian
(+)-catechin is one category of flavonoids in cocoa shell waste and it has been reported to have many health benefits. In order to isolate it from aqueous extracted solution of cocoa shell waste by solid phase extraction (SPE), a series of dual ionic liquids@ZIF8-covered silica were prepared as the sorbents. Regarding the operation conditions of SPE and the characteristic structure of (+)-catechin, ZIF8-covered silica was synthesized to establish a stable and porous substrate, and various dual ionic liquids with multiple properties were immobilized on substrate to obtain a high adsorption capacity. Different adsorption conditions were investigated and the highest adsorption capacity (58.0 mg/g) was obtained on Sil@ZIF8@EIM-EIM at 30 °C during 60.0 min. When the sorbent was applied in the SPE process, 96.0% of the total amount of (+)-catechin from cocoa shell waste can be isolated after several washing and elution steps. The satisfactory recoveries of 97.5–100.2% and RSDs of 1.3–3.2% revealed that the SPE process was accurate and precise. The stability of Sil@ZIF8@EIM-EIM was tested in water and the reusability was tested using repeated adsorption/desorption process. The results revealed that Sil@ZIF8@EIM-EIM as an efficient sorbent can isolate (+)-catechin from cocoa shell waste.Keywords:dual ionic liquid;ZIF8;composited silica;solid phase extraction;(+)-catechin;cocoa shell waste
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JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Jia Wei,Hongshuai Gao,Yao Li,Yi Nie
Utilizing phosphate-based ionic liquids (ILs) solvents for dissolving cellulose to prepare cellulose fibers has attracted much attention for its convenience, high yield, stability and sustainability. However, the degradation behavior during dissolving of cellulose in ILs, which is an important factor for fabricating cellulose fiber, is still unclear. In this work, the degradation of wood pulped cellulose (WPC) in three kinds of phosphate-based ILs: 1-ethyl-3-methylimidazolium dimethyl phosphate ([Emim]DMP), 1-ethyl-3-methylimidazolium diethyl phosphate ([Emim]DEP) and 1-butyl-3-ethylimidazolium diethyl phosphate ([Beim]DEP), were systematically investigated at different dissolution temperatures and dissolution times. The results indicated that the degradation degree of WPC in three ILs follows the order of [Emim]DEP > [Beim]DEP > [Emim]DMP, which is consistent with interaction results obtained by quantum chemical calculation, and degradation degree increases follows the rising of dissolution temperature and the accumulation of dissolution time. Moreover, no reducing sugar (RS) was found in any recycled ILs even when the degree of polymerization (DP) of regenerated cellulose (RC) decreased by 30.4%. In addition, according to the Fourier transform infrared and X-ray diffraction data, the results further proved that the crystallization type of RC changed from type Ⅰ to type Ⅱ. Here, preferable dissolving parameters and experiments data of multiple conditions are provided, which may provide practical reference and guidance for both scientific research and industrial.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
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IF 4.326
Qiangbing Shi,Kaixuan Wang,Mengjun Wang,Tao Li,Baozeng Ren,Yinge Bai,Xiangping Zhang
Four sulfate-based ILs, 1-butyl-3-ethylimidazolium ethyl sulfate [Beim][EtSO4], 1-ethyl-3-ethylimidazolium ethyl sulfate [Eeim][EtSO4], 1-ethyl-3-methylimidazolium ethyl sulfate [Emim][EtSO4], and 1-ethylpyridinium ethyl sulfate [Epy][EtSO4], were synthesized and used as an absorbent for dichloromethane (DCM). Among them, the maximum DCM absorption capacity of 0.426 g DCM g–1 IL was achieved in [Beim][EtSO4] at 313.15 K and 37.7% DCM concentration, which was 42.2% higher than that of common organic solvent bis(2-ethylhexyl) adipate under the same conditions. The density and viscosity of [Beim][EtSO4] containing different mass fractions of DCM were measured. The density of [Beim][EtSO4] increases with the mass fraction of adsorbed DCM, while the viscosity decreases sharply. The efficient performance of ILs to absorb DCM is mainly due to the hydrogen bonding interaction between the anion and DCM, which was confirmed by spectroscopic measurement and quantum chemical calculations. This work demonstrates the great potential of ILs in separating and recovering DCM from exhaust gas.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Guoqiang Lu,Hengda Yuan,Jiulei Zhou,Fuping Chen,Chao Li,Tanlong Xue,Xin Shu,Yingying Zhao,Jun Nie,Xiaoqun Zhu
Liquid conductor-based flexible sensors with high mechanical deformability and reliable electrical reversibility have aroused great interest in electronic skin, soft robotics, environmental monitoring, and other fields. Herein, we develop a novel strategy to fabricate liquid conductor-based flexible sensors by combining ionic liquid-based magnetofluids (IL-MFs), magnetic printing, and photopolymerization techniques. The as-prepared sensors exhibit excellent electromechanical properties, such as a wide detection range, low hysteresis, fast response time, good durability, etc. Moreover, the gauge factors (GFs) of the sensor could be easily adjusted by changing the modulators with different line widths or patterns, and the strain sensors can also be designed for anisotropic monitoring. Apart from serving as strain sensors, the magnetofluid-based flexible sensors can be used to detect external pressure, human activities, and changes in temperature, illumination, and magnetic field as well. This work provides a facile strategy to fabricate liquid conductor-based multifunctional sensors. Such a magnetofluid-based sensor has a great promising future.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Fangfang Su,Xiaoqian Li,Yudeng Wang,Zhongjie He,Ling Fan,Hongni Wang,Jinliang Xie,Yaping Zheng,Dongdong Yao
Porous liquids (PLs) are a type of porous materials that combine the porosity of solids and fluidity of liquids, which has attracted widespread attention. In this paper, we report a new TypeⅠhollow carbon sphere-based porous liquids, which are constituted of hollow carbon sphere (HCS) as the porous host, polymeric ionic liquid (PILs) as the corona and poly(ethylene glycol) 4-nonylphenyl 3-sulfopropyl ether potassium salt (PEGS) as the canopy. The viscosity of PLs is 8900 mPa·s at 50 ℃ (like syrup), which has good fluidity. Under 3 MPa pressure conditions, the best CO 2 adsorption capacity of 450-P[VHIm]Br-PEGS and 450-P[VBBI]Cl-PEGS are 2.06 and 1.90 mmol/g at 25 °C, respectively, higher than PILs-PEGS. Under the same conditions, the CO 2 adsorption capacity of PLs is 10.5 times higher than that of N 2 . Therefore, HCS-based PLs have the potential for CO 2 /N 2 selective gas separation. Not only PILs and the anionic alkyl chain of the outer layer widen the liquid range of PLs, but also is suitable for preparing PLs with other cavity units.
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EUROPEAN POLYMER JOURNAL
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2021
·
IF 4.598
Tianlin Wang,Yue Zheng,Guangren Yu,Xiaochun Chen
The catalytic effect of nanoparticles was significantly affected by its size and surface property. In this work, a series of ionic liquids were synthesized and used as surfactant to modify CoFe 2 O 4 MNP. XRD, FT-IR, TEM and VSM were performed to characterize modified CoFe 2 O 4 . The modified CoFe 2 O 4 MNP with average size of 7 nm was obtained and it was so well dispersed in ethylene glycol that ethylene glycol based magnetic fluid was obtained. Modified CoFe 2 O 4 MNP was used as catalyst for glycolysis of PET and showed excellent catalytic effect. The influence of ionic liquids surfactant and experimental factors on glycolysis were investigated. Under optimal condition, PET (5 g), catalyst (CoFe2O4/C10-OAC, 0.1 g) and EG (25 g) at 195 °C for 2.5 h, the PET conversion was 100% and BHET yield was 95.4%. More importantly, this catalyst can be collected by external magnetic field and its catalytic effect did not obviously decrease after it was reused for ten times. This work provided a new type of highly efficient catalyst of glycolysis of PET.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Bingbing Yang,Lu Bai,Shaojuan Zeng,Shuangjiang Luo,Lei Liu,Jiuli Han,Yi Nie,Xiangping Zhang,Suojiang Zhang
As ecological pollution and resource waste caused by NH 3 emission become increasingly serious, thus the separation and recovery of NH 3 from exhausted gases is of great significance both for environment and economy. Herein, we present a kind of novel ionic liquids (ILs)-based hybrid membranes for efficient NH 3 separation. Protic ILs (PILs) are adopted to form self-assembled gas highways in the hybrid membranes with the nanostructures of a middle-sulfonated pentablock copolymer, exhibiting extremely high NH 3 affinity and gas diffusion. The highest NH 3 permeability and ideal NH 3 /N 2 selectivity is up to 2711 Barrer and 1407 at ambient temperature and 1 bar, much superior to the state-of-the-art membranes reported. The results indicated that the novel IL-based hybrid membranes are promising candidates for high-efficient NH 3 separation and purification.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
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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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Haiyan Jiang,Tingting Li,Lu Bai,Jiuli Han,Xiaochun Zhang,Haifeng Dong,Shaojuan Zeng,Shuangjiang Luo,Xiangping Zhang
An efficient separation technology involving ammonia (NH3) and carbon dioxide (CO2) is of great importance for achieving low-carbon economy, environmental protection, and resource utilization. However, directly separating NH3 and CO2 for ammonia-based CO2 capture processes is still a great challenge. Herein, we propose a new strategy for selective separation of NH3 and CO2 by functional hybrid membranes that integrate polyimide (PI) and ionic liquids (ILs). The incorporated protic IL [Bim][NTf2] is confined in the interchain segment of PI, which decreases the fractional free volume and narrows the gas transport channel, benefiting the high separation selectivity of hybrid membranes. At the same time, the confined IL also provides high NH3 affinity for transport channels, promoting NH3 selective and fast transport owing to strong hydrogen bonding interaction between [Bim][NTf2] and NH3 molecules. Thus, the optimal hybrid membrane exhibits an ultrahigh NH3/CO2 ideal selectivity of up to 159 at 30 °C without sacrificing permeability, which is 60 times higher than that of the neat PI membrane and superior to the state-of-the art reported values. Moreover, the introduction of [Bim][NTf2] also reduces the permeation active energy of NH3 and reverses the hybrid membrane toward “NH3 affinity”, as understood by studying the effect of temperature. Also, NH3 molecules are much easier to transport at high temperature, showing great application potential in direct NH3/CO2 separation. Overall, this work provides a promising ultraselective membrane material for ammonia-based CO2 capture processes.
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JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Yangfeng Xia,Changbo Lu,Yaohui Wang,Jinmao Chen,Wanli Xu,Gaojun An,Yanqiang Zhang
Brønsted ionic liquids (BILs) were designed and applied to catalyze intramolecular cyclization of ketazines to 2-pyrazoline derivatives. Under the optimal conditions as 90 °C, 15 mol% [PsBim][CF 3 SO 3 ] dosage and 4 h, the conversion rate and selectivity of the reaction are up to 98 % and 99 % respectively. Through the substrate screening, it shows that the steric hindrance of the R group in ketazines is a big factor of cyclization activities, following the order of methyl (98 %) > ethyl (93 %) > n - propyl (87 %) > n‑butyl (81 %) > isopropyl (52 %) > isobutyl (46 %)> neobutyl (13 %). Moreover, the results of the density functional theory (DFT) calculations indicate that the cations and anions of BIL can synergistically participate in the ketazines configuration transformation step so as to significantly reduce the Gibbs free barrier energy from 30.65 to 20.12 kcal/mol, thereby promoting the cyclization reaction to synthesize 2-pyrazoline derivatives.
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