NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 5
·2309-2319
·
IF 3.591
Yichen Jiang,Yifei Zhao,Lin Liang,Xiao Zhang,Jianmin Sun
Imidazolium-based ionic liquid 1,n-dialkyl-3,3′-bis-1-vinyl imidazolium dibromide (n = 2, 4 and 6) monomers were synthesized and further polymerized inside a MIL-101 framework to afford poly(ionic liquid)@MIL-101 composites (PIL-n@MIL-101, n = 2, 4 and 6). Furthermore, the ratio of poly(ionic liquid) to MIL-101 affected the structures of the composites. Different molar ratios of PIL-4/MIL-101 were prepared and characterized using elemental analysis, powder X-ray diffractometry, thermogravimetric measurements, N2 adsorption/desorption and CO2 adsorption measurements. Thanks to the high Brunauer–Emmett–Teller surface area and porous structure of MIL-101 together with the incorporated poly(ionic liquid), PIL-4@MIL-101-0.5 exhibited good CO2 uptake capacity (42.7 cm3 g−1 at 100 kPa, 273 K). Additionally, due to the synergistic effects of the unsaturated coordinated Lewis acidic Cr sites and nucleophilic Br− in the PIL-4@MIL-101 composites, the developed composites exhibited efficient catalytic performance in the CO2 and epichlorohydrin cycloaddition reaction, with 99.6% conversion obtained at 90 °C and 1.0 MPa for 2.5 h without an additional cocatalyst or solvent. The composites also showed easy separation and better recycling stability. Combining the advantages of facile synthesis, excellent performance for CO2 adsorption and conversion, good thermal stability and recycling stabilities, the poly(ionic liquid)@MIL-101 composites are appealing candidates for application in CO2 capture and utilization.
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TALANTA
·
2021
·
IF 6.057
Jie Du,Faqiong Zhao,Baizhao Zeng
A novel solid-phase microextraction coating based on polypyrrole (Ppy) with manganese dioxide modified 6-aminohexanoic acid functionalized graphene (MnO 2 -fGr) and 1-allyl-3-vinylimidazolium bis(trifluoromethylsulfonyl)imide ([AVIm]NTf 2 ) as dopants (Ppy/MnO 2 -fGr/[AVIm]NTf 2 ) was successfully prepared by electrochemical method. The composite coating was characterized by scanning electron microscope (SEM), Fourier infrared spectrum (FT-IR) and thermogravimetry (TG). The composite coating showed coarse structure, which could improve the specific surface area of it, and according to the TG curve, it also had good thermal stability. The composite coating was used for the headspace-solid phase microextraction (HS-SPME) and chromatographic analysis of benzoates (i.e. methyl benzoate , ethyl benzoate, propyl benzoate, butyl benzoate)，by coupling with gas chromatography with hydrogen flame ionization detector (GC-FID). Under optimal conditions, their enrichment factors were 140–460, linear detection ranges were 25–60000 ng L −1 , and detection limits were 2.84–6.42 ng L −1 . The standard deviations for five consecutive extractions of 100 μg L −1 analytes were 3.00–10.20%, while the standard deviation for the extractions of 100 μg L −1 analytes with five different coatings were 5.70–13.80%. The proposed method was applied for the detection of the benzoates in cosmetics, and the recoveries for the spiked benzoates were 82.8–116.8%.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 7
·077511
·
IF 4.316
Yutong Li,Chao Du,Xinsheng Liu,Kai Wang,Huifang Yang,Yonghong Li
A non-enzymatic methyl parathion (MP) electrochemical sensor was fabricated based on hydroxyl functionalized ionic liquid/zeolitic imidazolate framework composites modified glassy carbon electrode (IL-ZIF-67/GCE). Scanning electron microscopy (SEM) was used to study the surface morphologies of the modified electrodes. ZIF-67 could be well dispersed by hydroxyl functionalized ionic liquid. The structures of the modification materials were characterized using Fourier transform infrared spectroscopy (FT-IR). Square wave voltammetry (SWV) was employed to investigate the electrochemical behavior of MP. The factors affecting the performance of the proposed sensor were also optimized. The sensor makes full use of the high conductivity of hydroxyl functionalized IL and the superior electrocatalytic activity of ZIF-67, exhibiting excellent selectivity and stability. Under the optimal conditions, the IL-ZIF-67/GCE showed a good linear relationship for MP in the range of 1–20 ng l−1, and the detection limit was as low as 0.5 ng l−1 (S/N = 3). The sensor was applied for the detection of MP in river water samples, and the sample recoveries ranged from 96.6% to 101.2%.
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FOOD CHEMISTRY
·
2021
·
IF 7.514
Qiaoyun Zhang,Weiwei Cheng,Di Wu,Yuling Yang,Xiao Feng,Chengcheng Gao,Linghan Meng,Xinchun Shen,Yan Zhang,Xiaozhi Tang
An electrochemical sensor was fabricated by modifying nanoporous gold (NPG)-coated glassy carbon electrode (NPG/GCE) with functionalized graphene oxide /chitosan/ionic liquid nanocomposites (fGO/CS/IL). The introduction of ionic liquid (IL) and chitosan (CS) induced higher dispersibility of functionalized graphene oxide (fGO), and was beneficial for the combination of fGO/CS/IL with NPG/GCE. As a result of the synergistic effect of NPG and fGO/CS/IL, the resulted functionalized graphene oxide/chitosan/ionic liquid nanocomposites/nanoporous gold /glassy carbon electrode (fGO/CS/IL/NPG/GCE) showed the highest redox peak current response signal of Amaranth (E123) due to ultrahigh surface area, electronic conductivity as well as the improvement of the surface structure. Under optimized conditions, the enhanced peak currents represented excellent analytical performance for detection of Amaranth in the concentration range from 8.0 to 1200.0 nM. Meanwhile, the fGO/CS/IL/NPG/GCE presented satisfactory sensitivity and selectivity, excellent reproducibility, and long-time stability. For practical applications, the fGO/CS/IL/NPG/GCE was validated for the determination of Amaranth in three types of drinks with satisfactory results.
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RSC Advances
·
2021
·Vol. 11
·期 22
·13085-13090
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IF 3.361
Shuang Han,Aixin Yao,Yuan Wang
Molecularly imprinted polymers with graphene oxide (GO) as a carrier (GMIPs) were synthesized to selectively recognize and capture cancer antigen 153 (CA153). The results show that the MIP has good selectivity and adsorption for CA153, and has strong anti-interference ability. Molecularly imprinted solid phase extraction (MISPE) combined with ultra performance liquid chromatography (UPLC) for the specific adsorption of CA153 was also established, and showed great potential for the analysis of CA153 in clinics in the future.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Daofan Ma,Chunying Zhu,Taotao Fu,Youguang Ma,Xigang Yuan
A novel hybrid absorbent by combining functionalized ionic liquid (IL) 1-(3-aminopropyl)-3-methylimidazolium tetrafluoroborate [Apmim][BF 4 ] with alkanolamines (monoethanolamine (MEA) and N, N-diethylethanolamine (DEEA)) was proposed for CO 2 capture. By means of a high-speed camera, the capacity and mass transfer performance of CO 2 absorption into the hybrid absorbent were investigated experimentally in microchannel over a wide range of concentration ratios (IL: amine) at the room temperature and atmosphere pressure. Three flow patterns were observed: Taylor-bubbly flow, Taylor flow and Taylor-annular flow. The results show that the CO 2 loading and mass transfer coefficient of alkanolamine solution could be improved remarkably by the addition of an appropriate amount of [Apmim][BF 4 ]. The molar ratio 3:2 of IL to amine was found to be optimal for CO 2 loading and mass transfer. Furthermore, the influences of gas and liquid flow rates on mass transfer were studied, and a new predicting correlation for CO 2 volumetric mass transfer coefficient was proposed.
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Journal of Analysis and Testing
·
2021
·Vol. 6
·期 4
·401-410
·
IF 0
Qiao Li-Zhen,Yu Chun-Mei,Sun Rui-Ting
In the present work, a novel amino-functionalized hexaalkylguanidinium chloride ionic liquid was prepared and grafted on the surface of magnetic materials through polyethyleneimine to enrich polycyclic aromatic hydrocarbons in water in combination with HPLC equipped with an ultraviolet detector. The effect of several parameters on the extraction efficiency was investigated, including the desorption solvent, the amounts of sorbents, the extraction time, the desorption time and the salt amount. Under the optimized conditions, the method validation exhibited good linearity with correlation coefficients above 0.994 in the range of 0.2–300 ng/mL and low limits of detection and quantification of 0.05 and 0.2 ng/mL, respectively. Besides, relative recoveries were in the range of 80–120%, and the intra-day and inter-day repeatability were good with the relative standard deviations of less than 20%. Finally, the guanidinium ionic liquid modified magnetic materials were applied for the extraction of polycyclic aromatic hydrocarbons from real water samples to demonstrate the utility, and the results show that the proposed method has good prospect for effective enrichment and determination of pollutants in water.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Yong Gao,Changsheng Sun,Chenze Qi
Room temperature ionic liquids (RTILs)-containing Pickering emulsions exhibit promising application potentials because of the integration of the “green” quality and the tunable applications of RTILs with the advantages of Pickering emulsions, such as the high stability and adjustable droplet size. In the present study, sterically-stabilized polymer nanoparticles (SSPNs) were first prepared via the reversible addition-fragmentation chain transfer (RAFT)-mediated non-aqueous dispersion polymerization , in which poly(lauryl methacrylate) (PLMA) and poly(4-vinyl pyridine) (P4VP) acted as the stabilizer block and the core-forming block, respectively. Kinetically-trapped PLMA- b -P4VP spheres and mixed spherical/worm-like morphologies could be achieved at a target copolymer composition . Subsequently, core cross-linked SSPNs (CSSPNs) were obtained by means of chemical cross-linking of P4VP cores of SSPNs with 1,4-dibromobutane in a diluted solution of SSPNs in toluene (0.4 mg/mL). Stable 1-butyl-3-methylimidazolium tetrafluoroborate-in-toluene ([Bmim][BF 4 ]-in-toluene) non-aqueous Pickering emulsions could be formed at a low emulsifier content of 0.005 wt% adopting CSSPNs with mixed spherical/worm-like morphologies as Pickering emulsifiers. Benefiting from large surface areas of Pickering emulsions and unique chemical/physical properties of RTILs, [Bmim][BF 4 ]-in-toluene Pickering emulsions provided readily available platforms for many organic reactions . As a proof of the concept, proline catalyzed Knoevenagel reaction of 4-nitrobenzaldehyde with malononitrile was chosen as a model here. Both high reaction efficiency and good recyclability were observed.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Jin Xu,Yanfei Chen,Yuanfang Tian,Zhaojie Yang,Zhixin Zhao,Wenhao Du,Xi Zhang
As a promising biodegradable resin, poly (butylene succinate) (PBS) is often blended with starch to reduce the cost. In this paper, 1-buyl-3-methylimidazolium halide pre-plasticized corn starch (CS) was blended with PBS to prepare PBS/corn starch blend material modified by ionic liquid (PBS/CS-IL). Ionic liquid (IL) acted as plasticizer and compatibilizer, and the effects of 1-butyl-3-methylimidazolium halide with different halogen anion on PBS/Starch blends were explored. The effects of IL on the structure and tensile property of PBS/Starch blends were evaluated by FTIR, SEM, DSC , TGA and XRD, respectively. Test results showed that the addition of IL significantly reduced the crystallinity of PBS/Starch blends, and the size of starch particles in the PBS matrix was also effectively reduced. IL also acted as a compatibilizer of starch and PBS, and induced the morphology of the blends to change from “sea-island” structure to homogeneous phase. The results of the tensile test showed that compared with the PBS/Starch blend without IL, the elongation at break of PBS/CS-IL increased from 22% to 93%. This study provided a simple and feasible method for the preparation of low-cost PBS bio-composite materials, and provided theoretical support for future industrial production.
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GREEN CHEMISTRY
·
2020
·Vol. 22
·期 22
·7913-7923
·
IF 9.48
Gang Wang,Zengxi Li,Chunshan Li,Suojiang Zhang
The direct synthesis of methyl acrylate (MA) from methyl acetate and trioxane at 350–380 °C is regarded as a supplementary route for the industrial propylene oxidation process; however, it suffers from rapid catalyst deactivation. Herein, a novel ionic liquid catalyzed mild liquid-phase system was developed for the direct synthesis of MA from methyl acetate and trioxane, where N,O-bis(trimethylsilyl)acetamide (BSA) was used as a probase for α-deprotonation and enol silyl etherification of methyl acetate. The trioxane decomposition to formaldehyde and methyl acetate enolization to 1-methoxy-1-trimethylsilyloxyethene proceeded with the catalysis of [Cation]Cl/MClx (M = Cu+, Fe3+, Zn2+ and Al3+) and [Cation]F, respectively. The cations and anions were observed to have significant effects on the yield and selectivity of MA, owing to the steric hindrance, acid site category and strength confirmed by pyridine probing FT-IR characterization. As a result, up to 60.2% yield with 94.6% selectivity of MA could be achieved when [N3,3,3,3]F and [N3,3,3,3]Cl/AlCl3 with 67 mol% AlCl3 were used in the presence of BSA at 25 °C. Kinetic studies indicated that the trioxane decomposition with the activation barrier of 41.2 ± 0.3 kJ mol−1 was the rate-determining step.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Yan Wu,Jing-Pei Cao,Qi-Qi Zhuang,Xiao-Yan Zhao,Zhi Zhou,Yu-Lei Wei,Ming Zhao,Hong-Cun Bai
Due to the interconnected network and high porosity, melamine foam has been selected as the template to obtain hierarchical porous carbon. In this paper, porous carbon with hierarchical porous structure, high pore volume and high specific surface area is prepared by using melamine foam as template and waste liquid (from the production of vitamin C) as carbon precursor coupled with KOH-activation. Owing to these favorable structural characteristics, the supercapacitors electrodes based on the as-prepared products have outstanding electrochemical performances in 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF 4 ) electrolyte. The optimized electrode (WMFPC 700-5 ) reaches a high specific capacitance (217 F g −1 at 0.1 A g −1 ) and superior cycling stability (specific capacitance retention of 89% after 10000 cycles at 5 A g −1 ). Notably, supercapacitors displays an ultra-high energy density of 107 Wh kg −1 at a power density of 94 W kg −1 in EMIMBF 4 electrolyte system. In addition, the all-solid-state symmetric supercapacitors based on WMFPC 700-5 demonstrates a remarkable specific capacitance of 180 F g −1 at 0.5 A g −1 in the EMIMBF 4 /PVDF-HFP gel polymer electrolyte .
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TALANTA
·
2020
·
IF 5.339
Lite Yang,Bihong Zhang,Bingjie Xu,Faqiong Zhao,Baizhao Zeng
An innovative electrochemical sensor for paracetamol (PCM) determination was fabricated by electropolymerization imprinting on three-dimension (3D) AuPd nanoparticles‒ionic liquid (IL) functionalized graphene‒carbon nanotubes nanocomposite (AuPd/GN-CNTs-IL) modified glassy carbon electrode. The GN-CNTs supported AuPd alloy nanoparticles were prepared via one-pot hydrothermal method in the presence of IL (i.e. 1-hydroxyethyl-3-methyl imidazolium bis[(trifluoromethyl) sulfonyl] imide), which not only promoted the formation of small AuPd alloy nanoparticles, but also acted as “spacer” to prevent the π-π stacking and aggregation of graphene sheets and carbon nanotubes . The resulting composite had large surface area and high electrocatalysis . The PCM imprinted poly(carbazole-co-pyrrole) exhibited good recognition to PCM and had high stability. Based on the synergic effect of PCM imprinted copolymer and 3D AuPd/GN-CNTs-IL nanocomposite, a highly selective and sensitive electrochemical sensor was established. It presented a good linear relationship from 0.10 to 10 μM with a low limit of detection of 50 nM (S/N = 3). The sensor could be applied to the detection of PCM in biological samples, with acceptable recoveries (84.5%–102%). In addition, it was successfully used to monitor the concentration of PCM in urine from a patient with fever cold.
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