CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhiwen Lei,Jinlai Shen,Jun Wang,Qi Qiu,Guangzhao Zhang,Shang-Sen Chi,Hongli Xu,Shuai Li,Weide Zhang,Yusheng Zhao,Yonghong Deng,Chaoyang Wang
The stable structure, high porosity and surface functionality endow metal organic frameworks (MOFs) nanoparticles as excellent nanofillers for high-performance poly (ethyleneoxide)-based solid polymer electrolytes (PEO SPEs). However, the agglomeration of MOFs severely limits their potential applications. Herein, a novel zeolitic imidazolate framework-90 nanofiller grafted with imidazole ionic liquid containing siloxane groups (ZIF-90-g-IL) is prepared by dehydration condensation reaction, which enables the uniform distribution of the nanofiller in PEO SPEs. The resulting composite PEO SPE with ZIF-90-g-IL nanofillers delivers higher ionic conductivity of 1.17 × 10 -4 S/cm at 30 °C and lithium ion transference number of 0.44, wider electrochemical stability window of 4.8 V, and stronger ability to inhibit lithium dendrite growth than the PEO SPE with unmodified ZIF-90. The strong interaction of ZIF-90-g-IL with PEO is caused by the chelation of quaternary ammonium cations of ionic liquid groups on the ZIF-90-g-IL surface with oxygen containing a lone pair of electrons of PEO, resulting in a uniform distribution of the nanofillers in PEO. The LFP||Li half cells with the PEO/ZIF-90-g-IL SPE exhibit good cycling performance with 71% capacity retention (101 mAh g −1 ) after 500 cycles at 2C under 60 °C, and show excellent cycling performance with 97.4% capacity retention (148 mAh g −1 ) after 30 cycles at 0.1C under 30 °C. The composite SPE is also used for high-voltage NCM811||Li half cells. The capacity retention is 63% (99 mAh g −1 ) after 100 cycles at 0.1C under 60 °C. The results imply ZIF-90-g-IL as effective nanofillers for SPEs showing a great potential application in all solid-state lithium metal batteries.
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CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Qinyuan Ma,Xiuzhen Gao,Xinyu Bi,Qi Han,Linna Tu,Yupeng Yang,Yanbing Shen,Min Wang
Chitin is the second most abundant renewable polymer on earth, and its deacetylated derivative, chitosan, is a highly useful biopolymer. This work studied for the first time the application of ionic liquid (IL) tetrabutylammonium hydroxide ([TBA][OH]) and chitin deacetylase from Rhodococcus equi CGMCC14861 (ReCDA) for the efficient conversion of chitin into chitosan at room temperature. Results confirmed that chitin had good solubility in 18 wt% aqueous [TBA][OH] solution at 80 ℃. In addition, efficient chitin deactylation was observed with high concentrations of [TBA][OH] exceeding 12 wt% and showing potential application in chitin conversion. ReCDA activity on chitin was activated by [TBA][OH] pretreatment. Sequential and simultaneous strategies were also compared, and the results showed that the simultaneous one-pot deacetylation provided the highest acetic acid yield of 3.78 mg/g chitin powder after 24 h. This study serves as a guide for the dissolution and deacetylation of chitin to produce high value-added chitosan products.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yaling Wu,Xiaotong Sun,Huiying Wang,Jiawei Shen,Yanxiong Ke
The control of pore size in mesoporous silica particles is still a topic of considerable research attention for the preparation of chromatographic packing materials. In this study, three alkyl imidazole ionic liquid surfactants ([BRIJO n -MIM]Ts ( n = 2, 10, 20)) were synthesized from polyoxyethylene oleyl ether (BRIJ™O n , n = 2, 10, 20), 1-methylimidazole, and p-toluenesulfonyl chloride. [BRIJO n -MIM]Ts ( n = 2, 10, 20) exhibited different template behaviors in the preparation of mesoporous silica , and hollow silica with worm-like vesicle structures, spherical silica, and gel were obtained, respectively. Monodisperse sub-3 µm core-shell silica particles (CSSPs) with narrow pore size distribution were successfully prepared by the ultrasound-assisted sol-gel method using [BRIJO 10 -MIM]Ts as the template. A shell thickness of up to 300 nm was obtained, and the pore size was expanded from 4.7 to 7.3 nm by adjusting the reaction parameters, overcoming the limitation of pore size to less than 4 nm when using organic alkyl quaternary ammonium or alkyl imidazolium surfactants as the templates. The synthesized 2.7 µm CSSPs were functionalized with tert-butylcarbamoylated quinine and used as an anion exchange chiral stationary phase, exhibiting excellent separation performance for N-substituted amino acid enantiomers .
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JOURNAL OF MOLECULAR STRUCTURE
·
2021
·
IF 3.196
Jinlong Li,Boxin Li,Guozhe Sui,Lijuan Du,Yan Zhuang,Yulin Zhang,Yuanfang Zou
Volatile organic compounds (VOCs) with toxicity properties discharged from industrial emissions and combustion engines threaten human health and cause environmental problems. Therefore, it is important to develop technologies to remove VOCs from air. In this study, the performance of Nd (neodymium) -TiO 2 nanoparticles embedded in a supported ionic liquid membrane (SILM) for removal of VOCs from air was investigated. Aiming at functionalizing the ionic liquid membrane with photocatalytic capability, we developed a facile and effective approach for the removal of VOCs by coupling highly efficient photocatalysts with the SILM. Nd-TiO 2 nanoparticles , which are ultraviolet-visible (UV–Vis) light-driven photocatalysts, were prepared by sol-gel and immersed in the SILM for use as a photocatalytic membrane-based reactor. The gaseous VOCs tested were toluene, acetone, chloroform, benzene, and xylene. We confirmed that at a loading of 50 wt% Nd-TiO 2 nanoparticles (1 wt% Nd content) and 1-hexyl-3-methylimidazolium hexafluorophosphate ([HMI m ]PF 6 ) as SILM ([HMI m ]PF 6 /Nd-TiO 2 SILM), the as-prepared photocatalytic membrane-based reactor exhibited higher removal efficiency of VOCs from air (60~80% removal after 10 h) under UV–Vis light illumination than individual SILM or photocatalytic systems. Effluent gas analysis revealed that 25–55% of VOCs was decomposed and mineralized in the photocatalytic membrane reactor, which exhibited higher VOCs removal efficiency than membrane separation. These results indicate that the photocatalytic membrane-based reactor containing Nd-TiO 2 nanoparticles and SILM designed in this study is highly active and stable. This study on [HMIm]PF 6 /Nd-TiO 2 SILM was initiated to couple membrane separation with photocatalytic degradation of gaseous VOCs and can serve as a promising way for eliminating harmful VOCs with low concentration from air.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 11
·6362-6375
·
IF 2.599
Yang Lili,Jiang Guancheng,Shi Yawei,Lin Xin,Yang Xiao
Bentonite/water-based drilling fluids (BT-WDFs) suffer serious fluid loss particularly at high temperatures, pressure levels, and divalent cation concentrations. The ionic liquid 1-vinyl-3-ethylimidazolium bromide was introduced to synthesize a filtration control additive (PASV) through free radical copolymerization with acrylamide and 2-acrylamido-2-methylpropanesulfonic acid. The effect of the concentration of the ionic liquid on the filtration property of the fluids was determined at high Ca 2+ concentrations and temperatures. BT-WDFs added with 3.0 wt% copolymer exhibited excellent performance for controlling bivalent Ca 2+ -resistant fluid loss and tolerated the influence of Ca 2+ up to 70 wt%, which approaches the saturation at room temperature (25 °C). As the PASV concentration increased to more than 1.0 wt%, the fluid loss volume was less than 10 mL at room temperature, thereby ensuring safe drilling operation. When the formations drilled were at high temperatures, the filtration control performance was obtained by adding PASV additives. The requisite concentration of PASV varied from 1.5 to 3.0% at 80–150 °C. An extremely dense filter cake was produced because of the elimination of the influence of Ca 2+ on bentonite and the stabilization of the bentonite dispersion state by the PASV copolymer. These effects improved the filtration control performance of BT-WDFs. Moreover, the fluids exhibited shear thinning behavior over the shear rate range of 0.1–1000 s −1 , resulting in improved practical drilling process. This study provides a basis for applying ionic liquids in the design of additives for drilling fluids.
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MICROCHEMICAL JOURNAL
·
2018
·
IF 2.746
Kai Hu,Jingyi Qiao,Xiangxiang Wu,Huaixia Yang,Yanjie Huang,Shusheng Zhang
A novel magnetic sorbent has been synthesized by co-polymerization of calixarene ionic liquid and mercaptan-modified Fe 3 O 4 particles. This material was used as a sorbent for dispersive solid phase extraction of trace-level flavonoids in the samples of bottled fruit juice and green tea without other pre-treatments. The experimental parameters were investigated and optimized. Coupled with high performance liquid chromatography, an analytical method was established and successfully applied to the determination of flavonoids in these beverages. The proposed method showed good linearity for the analytes with a correlation coefficient ( r ) > 0.9982, and detection limits for the flavonoids ranged 0.15–0.75 ng mL −1 were achieved. The proposed method has been used successfully to determine flavonoids in bottled fruit juice and green tea samples with satisfactory recoveries of 92.5–104.8% and relative standard deviations ≤ 5.2%. The results suggest that poly(calixarene ionic liquid) modified Fe 3 O 4 nanoparticles can be used in the extraction of flavonoids in beverage samples.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 49
·期 3
·746-754
·
IF 2.7
Bing Fang,Haiyue Wang,Wei Chang,Yibang Yao,Liying Guo,Yuanyuan Zhao,Bing Liu
The utilization of aliphatic diols as a substitute for epoxides in the reaction with CO2 to produce cyclic carbonates offers a cost-effective and less hazardous synthesis route. This approach aligns with green chemistry principles and presents new strategies to combat climate change. This study primarily focuses on the innovative application of an alkaline ionic liquid in conjunction with a Brønsted acid for the catalytic synthesis of cyclic carbonates from CO2 and aliphatic diols. Three alkaline ionic liquid catalysts [DBUH]PHY, [TBDH]PHY, and [DBUH]TBD were successfully synthesized using 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD), and phenol as precursors. Their chemical structures and thermal properties were systematically characterized using Fourier-transform infrared spectroscopy (FT-IR), proton nuclear magnetic resonance (1H-NMR), carbon nuclear magnetic resonance (13C-NMR), and thermogravimetric (TG) analysis. The catalytic performance of the three alkaline ionic liquids combined with various Brønsted acids (including sulfuric acid, phosphoric acid, and acetic acid) for the synthesis of ethylene carbonate (EC) from ethylene glycol (EG) and CO2 was investigated. The results demonstrated that the combination of [DBUH]PHY with sulfuric acid (H2SO4) exhibited the best synergetic catalytic effect. Subsequently, the process parameters were optimized to study the effects of reaction temperature, pressure, time, and catalyst loading on catalytic performance. Under optimized conditions, the catalytic efficiency of [DBUH]PHY and sulfuric acid in the synthesis of cyclic carbonates from different aliphatic diols, including ethylene glycol, propylene glycol (1,2- and 1,3-), and butanediol (1,4-), was explored. This study successfully achieved the activation of aliphatic diols and CO2 through cooperative catalysis of alkaline ionic liquids and Brønsted acids, providing an innovative catalytic system for research in this field.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Yan Gao,Liangting Cheng,Ruimin Gao,Guangfa Hu,Jianshe Zhao
In this work, polyoxometalates-based monomer ionic liquid, dimer ionic liquid and polyionic liquid were designed and prepared. Then supported catalysts were synthesized by loading polyoxometalate derivatives on the surface of graphene oxide (GO). The catalysts before and after loading were characterized via many tests such as scanning electron microscope (SEM), infrared spectroscopy (IR), X-ray powder diffraction (XRD) and so on. The influences of ionic liquid type and carrier on desulfurization activity were carried out. The result shows that supported catalyst-based polyionic liquid (P[Vim]POM/GO) performed high activity and excellent recyclability in extraction-oxidation desulfurization (EODS) due to unique state of polyoxometalate and the support of graphene oxide. In addition, the possible mechanism of oxidation dibenzothiophene (DBT) with H 2 O 2 was proposed according to the kinetic study and gas chromatography-mass spectrometer (GC–MS) result.
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高影响因子
MOLECULES
·
2022
·Vol. 27
·期 23
·8522
·
IF 4.927
Runtang Liu,Wei Zhang,Shushu Wang,Huajin Xu,Yi Hu
In this study, polyethyleneimine was combined with magnetic Fe3O4nanoparticles through the bridging of carboxyl-functionalized ionic liquid, and laccase was loaded onto the carrier by Cu2+chelation to achieve laccase immobilization (MCIL–PEI–Cu–lac). The carrier was characterized by Fourier transform infrared spectroscopy, scanning electron microscope, thermogravimetric analysis, X-ray diffraction analysis, magnetic hysteresis loop and so on. MCIL–PEI–Cu–lac has good immobilization ability; its loading and activity retention could reach 52.19 mg/g and 91.65%, respectively. Compared with free laccase, its thermal stability and storage stability have been significantly improved, as well. After 6 h of storage at 60 °C, 51.45% of the laccase activity could still be retained, and 81.13% of the laccase activity remained after 1 month of storage at 3 °C. In the pollutants removal test, the removal rate of 2,4-dichlorophenol (10 mg/L) by MCIL–PEI–Cu–lac could reach 100% within 10 h, and the removal efficiency could still be maintained 60.21% after repeated use for 8 times. In addition, MCIL–PEI–Cu–lac also has a good removal effect on other phenolic pollutants (such as bisphenol A, phenol, 4-chlorophenol, etc.). Research results indicated that an efficient strategy for laccase immobilization to biodegrade phenolic pollutants was developed.
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JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Fengxiang Liu,Shuang Wang,Jinsheng Li,Xiaodong Wang,Zhipeng Yong,Yinghe Cui,Dan Liang,Zhe Wang
Novel double cross-linked composite membranes are fabricated based on diazoniabicyclo-type poly (ionic liquid) with trimethoxysilane groups ([TSPDO]BrCl) and norbornene-type polybenzimidazole (NbPBI). During membrane fabrication, in-situ free radical polymerizations and in-situ sol-gel reactions are completed to form the poly (ionic liquid)-NbPBI cross-linked networks and the Si-O-Si networks, respectively. An obvious advantage of this strategy is that the trimethoxysilane groups are fixed by the first cross-linked networks before hydrolysis reaction . Such method can avoid structural defects caused by SiO 2 particle aggregation in the membranes. Compared to the pristine NbPBI cross-linked membrane, the NbPBI-TSPDO cross-linked membranes exhibit enhanced thermal stability, mechanical properties, and proton conductivity . Considering the comprehensive performance, the NbPBI-TSPDO 30 membrane has the highest proton conductivity of 0.061 S cm −1 at 170 °C under anhydrous conditions. Moreover, NbPBI-TSPDO membranes display an improved PA retention rate of up to 81% and 64% at 160 °C for 400 h and 80 °C/40% RH for 96 h, respectively.
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TENSIDE SURFACTANTS DETERGENTS
·
2020
·Vol. 57
·期 2
·129-137
·
IF 1.089
Shanshan Kong,Lei Li,Chen Chen,Xu Li,Lei Liu,Jinxiang Dong
The Fischer-Tropsch synthesis can be used to achieve a high content of α-olefin (C 5 –C 11 ) products using Fe-based catalysts. Herein, C 6 and C 8 α-olefins have been selected as examples for the alkylation of benzene catalyzed by using an acidic ionic liquid (Et 3 NHCl-AlCl 3 ) to obtain a variety of intermediates used to prepare surfactants. A series of alkylbenzenes were synthesized by controlling the reaction conditions and their corresponding alkylbenzene sulfonates were successfully obtained by sulfonation and neutralization. It was found that the single chain alkylbenzene sulfonate derivatives did not display typical surfactant properties due to their short hydrophobic chain length. However, double chain alkylbenzene sulfonates exhibit excellent surfactant properties, and decrease the water surface tension compared to commercially available sodium dodecylbenzene sulfonates. A γ cmc (mN m −1 ) value of 32.70 was observed for sodium di-hexylbenzene sulfonates, 29.98 for sodium di-octylbenzene sulfonates, and 36.0 for sodium dodecylbenzene sulfonates. In addition, double chain alkylbenzene sulfonates show an improved emulsifying and wettability performance compared to sodium dodecylbenzene sulfonate. This demonstrates that the capability of alkylbenzene sulfonate to decrease the surface tension are closely related to the total carbon number of side chain-alkyl groups connected to the benzene ring.
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Ning Zhou,Yufeng Wang,Yang Zhou,Jinyou Shen,Yong Zhou,Yong Yang
Star-shaped polymeric ionic liquids (PIL-3 and PIL-4) based on poly(2-(dimethyl-ethyl-amino)ethyl methacrylate) bis(trifluoromethylsulfonyl)imide (P(EtDMAEMA-TFSI)) with three-arm and four-arm architectures were prepared through atom transfer radical polymerization (ATRP) and ion exchange. Subsequently, gel polymer electrolytes (GPEs) comprising PIL host, N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium bis(trifluoromethylsulfonyl)imide (DEME-TFSI) ionic liquid (IL) plasticizer with the same anion unit and LiTFSI salt were obtained. Compared with the linear PIL possessing the same elements, the increase of branches for PIL decreases the crystallity and glass transition temperature (T g ) of the corresponding GPEs. Accordingly, the ionic conductivity , electrochemical window and ion transport number of three-arm and four-arm PILs based GPEs (PIL-GPE-3 and PIL-GPE-4) are obviously superior to the linear contrastive sample. Among lithium metal batteries assembled by linear, three-arm and four-arm PILs based GPEs, Li/PIL-GPE-4/LiFePO 4 presents the best performance. The specific discharge capacity attains 151 mAh g −1 at 0.1 C, the capacity retention ratio achieves 93.6% after 100 cycles at 60 °C, and the coulombic efficiency is around 99%. The outstanding compatibility between PIL-4 and IL and the resulted interfacial stability between PIL-GPE-4 and electrodes both contribute to the excellent performance.
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危险品化学品经营许可证（带存储）