COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Xiuping Tang,Yu Hou,Qing Bo Meng,Guolin Zhang,Fuxin Liang,Xi-Ming Song
In this work, we developed a continuous non-aqueous flow Pickering emulsion interface catalysis (FPIC) system for heterogeneous acylation. Poly (1-vinyl-3-ethylimidazolium bromide) (PILs) functionalized silica@PS/PDVB Janus particles (JPs) were synthesized. The catalyst H 3 PW 12 O 40 (PA) was then immobilized on PIL-modified JPs by anion-exchanging. The PIL grafted on the silica side and the inherent oleophilic phenyl groups on the other side endow the Janus particle with excellent amphipathy for the immiscible ionic liquid (IL) [BMIM]BF 4 and toluene. Therefore, emulsification and catalytic capability were realized simultaneously on the PA-PILs-JPs. The FPIC column system for acylation reaction was accomplished by packing the IL-in-oil Pickering emulsion into a column reactor, and exhibited excellent catalytic performance, high stability during the reaction process as well as remarkable recyclability.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Xueqing Wang,Wensheng Tan,Yong Wang,Datong Wu,Yong Kong
In this study, electrocatalytic sensing of gallic acid (GA) with poly( m -phenylenediamine) (PmPD) electrodeposited on the nanocomposites of palygorskite (Pal) and ionic liquid (IL) was reported. The PmPD/Pal-IL modified electrode showed a low limit of detection (LOD) of 0.28 μM and a wide linear range from 1.0 μM to 300 μM for electrochemical sensing of GA due to the synergistic effects of PmPD, Pal and IL. That is to say, electrocatalysis of PmPD, preconcentration ability of Pal and ionic conductivity of IL contributed to the sensitive determination of GA. In addition, the fabricated PmPD/Pal-IL also exhibited high selectivity with little interferences from common organic compounds and inorganic cations, high storage stability and reproducibility in the determination of GA. Finally, the proposed GA sensor was applied in the determination of GA in real food samples, and the results demonstrated the potential of the prepared PmPD/Pal-IL as a promising GA sensor for rapid and accurate determination of GA in foodstuffs.
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CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Huixue Ren,Bingjin Li,Markus Neckenig,Daoji Wu,Yaqi Li,Yongshan Ma,Xuemei Li,Na Zhang
Three novel and highly effective AAIL-modified Chitosan (CS) adsorbents are presented. These three new CS-gels were prepared by an innovative synthetic method that uses amino acid ionic liquids (AA-ILs) to cross-link CS with, separately, glutamic acid, aspartic acid and alanine to give novel adsorbents Glu-AA-IL-CS (1), Asp-AA-IL-CS (2) and Ala-AA-IL-CS (3) respectively. The effectively incarcerating host-structures (1) - (3) were characterized by a whole range of techniques including FT-IR, SEM, EDS and XRD. The differences amongst novel adsorbents (1) - (3) with regard to their rate and efficiency of removal of Pb 2+ from aqueous solutions are explained in terms of the different electronic, structural and steric features of the three amino acids. The glutamic acid variant (1) is clearly shown to be the best-performing adsorbent by experimental tests and data in combination with infrared spectroscopy. The behaviour of adsorbents (1) follows pseudo-second-order kinetics,and accord best with the Freundlich adsorption isotherm.
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JOURNAL OF CHROMATOGRAPHY A
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2019
·
IF 3.858
Minsheng Li,Xiaoyun Lei,Yan Huang,Yuan Guo,Bingyu Zhang,Fengxiang Tang,Xiaoping Wu
A simple thiol-ene photopolymerization approach was developed for the rapid preparation of ionic liquid-functionalized hybrid monolithic column based on polyhedral oligomeric silsesquioxane (POSS). “One-pot” polymerization was realized in the UV-transparent fused-silica capillary by using octanethiol, 1-allyl-3-methylimidazolium hexafluorophosphate as functional monomers and methacryl-substituted POSS as a crosslinker. The thiol-vinyl-methacrylate ternary system uniquely exhibits a mixed step-chain growth polymerization regime that combining the thiol-ene reaction and free-radical reaction mechanisms, which provides a simple route to prepare novel POSS-based functionalized hybrid monoliths. The pore property, permeability, and electroosmotic flow (EOF) of the hybrid monoliths can be tailored by proper adjustment of the feeding composition and initiation condition. Morphologic and spectroscopic characterizations of monolithic columns clearly indicate that utilization of the photo-initiated approach in thiol-vinyl polymerization can generate a more homogeneous porous structure, smaller domain size and higher column efficiency (53,800–60,300 plates/m for alkylbenzenes) than the thermally-initiated one (32,800–49,300 plates/m). Significant improvements in mechanical stability, anti-swelling property and tailorability of hybrid polymer were achieved in a simple manner, owing to the photopolymerization of rigid nanoscale POSS units and imidazolium-based ionic liquids in ternary thiol-vinyl system for the first time. The resulting hybrid monolith possessed controllable EOFs at pH values from 2 to 10, and showed a multimode separation mechanism in capillary electrochromatography, including π-π interaction, ion exchange, electrophoretic migration, electrostatic and hydrophobic interaction. Satisfactory separation ability was achieved for the analysis of different types of small molecules.
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ACS Omega
·
2018
·
IF 0
Tianyi Tang,Tong Ling,Mengfei Xu,Weiping Wang,Zhi Zheng,Zhonglin Qiu,Wenling Fan,Lei Li,Youting Wu
In this study, hydroxyl-terminated polybutadiene–poly(epoxide ionic liquid)–poly(urethane urea) (HTPB-PEIL-PU) membranes, HTPB-PEIL1-PU and HTPB-PEIL2-PU, were prepared by the reaction of functionalized PEIL, poly(1-methylimidazole-3-methyl-ethyloxy)hexafluorophosphate or poly(1-methylimidazole-3-methyl-ethyloxy)bistrifluoromethanesulfonimidate, respectively, with HTPB using 4,4′-diphenylmethane diisocyanate (MDI) as the chain extender. The HTPB-PEIL-PU and HTPB membranes were investigated for the selective recovery of n-butanol from aqueous solutions by pervaporation. PEIL was confirmed to be successfully embedded in the PU membranes by 1H NMR, Fourier transform infrared, and differential scanning calorimetry measurements. According to our mechanical measurements, the HTPB-PEIL-PU membranes retain the mechanical properties of the original PU membrane. PEIL was shown to enhance the diffusion rate of n-butanol significantly based on swelling behavior tests. The pervaporation flux through the HTPB-PEIL1-PU membrane increased with increasing feed temperature and feed concentration. In contrast, the separation factor of the HTPB-PEIL1-PU membrane increased with increasing feed temperature but decreased with increasing feed concentration. In addition, the HTPB-PEIL2-PU membrane exhibited an optimal separation factor of up to 29.2 at a feed concentration of 3% and a feed temperature of 70 °C, which is superior to that (22.7) through pure HTPB membranes. Furthermore, the HTPB-PEIL1-PU and HTPB-PEIL2-PU membranes show better long-term stability than other supported ionic liquid membranes.
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JOURNAL OF SEPARATION SCIENCE
·
2018
·Vol. 42
·期 3
·725-735
·
IF 2.415
Guifen Zhu,Guohao Cheng,Li Wang,Wenna Yu,Peiyun Wang,Jing Fan
Toward improving the selective adsorption performance of molecularly imprinted polymers in strong polar solvents, in this work, a new ionic liquid functional monomer, 1-butyl-3-vinylimidazolium bromide, was used to synthesize sulfamethoxazole imprinted polymer in methanol. The resulting molecularly imprinted polymer was characterized by Fourier transform infrared spectra and scanning electron microscopy, and the rebinding mechanism of the molecularly imprinted polymer for sulfonamides was studied. A static equilibrium experiment revealed that the as-obtained molecularly imprinted polymer had higher molecular recognition for sulfonamides (e.g., sulfamethoxazole, sulfamonomethoxine, and sulfadiazine) in methanol; however, its adsorption of interferent (e.g., diphenylamine, metronidazole, 2,4-dichlorophenol, and m-dihydroxybenzene) was quite low. 1 H NMR spectroscopy indicated that the excellent recognition performance of the imprinted polymer was based primarily on hydrogen bond, electrostatic and π-π interactions. Furthermore, the molecularly imprinted polymer can be employed as a solid phase extraction sorbent to effectively extract sulfamethoxazole from a mixed solution. Combined with high-performance liquid chromatography analysis, a valid molecularly imprinted polymer-solid phase extraction protocol was established for extraction and detection of trace sulfamethoxazole in spiked soil and sediment samples, and with a recovery that ranged from 93–107%, and a relative standard deviation of lower than 9.7%.
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POLYMER DEGRADATION AND STABILITY
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2019
·
IF 3.78
Fusheng Liu,Jiao Guo,Penghui Zhao,Yongqiang Gu,Jun Gao,Mengshuai Liu
Several DBU-based protic ionic liquids were facilely synthesized, they were successfully used as solvents and catalysts for alcoholysis of poly(lactic acid) (PLA) to yield lactate esters . The structure of ionic liquids and reaction parameters were optimized. Using [HDBU][AA] as the catalytic medium, which was composed by a 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) cation and an acetate anion, the PLA could be completely depolymerized with a 91% methyl lactate yield under the conditions of 100 °C, 5 mol% catalyst loading for 5 h. The effect of alcohol structures on the catalytic behaviors was studied, and good to excellent product yields were obtained. Moreover, the developed [HDBU][AA] showed excellent recyclability and structure stability. A possible reaction mechanism concerning the synergistic effect of the anion-cation ions was proposed. The DBU-based protic ionic liquids presented herein are low-cost and one-step synthesized, exhibiting great potential as green and efficient platform for direct and selective alcoholysis of PLA.
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Journal of Energy Storage
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2019
·
IF 3.517
Dewei Wang,Jiawang Nai,Lang Xu,Tao Sun
The development of high-performance supercapacitors in ionic liquid hold great potential for application in next generation electrochemical energy storage devices, however, it is still facing contradictory requirements between specific capacitance and rate capability. Herein, we developed a facile method for the synthesis of 2D porous carbon nanosheets (PCNSs) from sodium alginate by utilizing an integrated gunpowder chemistry-assisted exfoliation and subsequent KOH activation procedure. The as-prepared PCNSs showed a 2D nanosheets structure and large specific surface area. A symmetric supercapacitor device with ionic liquid as the electrolyte can operate in a wide voltage window of 3.5 V. Importantly, PCNS -3 based device presents a specific capacitance as large as 226.9 F/g at 1 A/ g, superior rate capability (68% of capacitance retention at 50 A/g), outstanding cycling stability (94% of its initial capacitance after 10 000 cycles), and integrated high energy & power densities (65.6 Wh/kg at 43.75 kW/kg). This work provides an alternative way towards 2D porous carbon nanosheets electrode materials with abundant narrow mesopores for rapid mass transfer and ion transport in supercapacitors as well as other nanocarbon-based electrochemical energy storage devices.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Yongli Sun,Baoli Wang,Na Yang,Xiaowei Tantai,Xiaoming Xiao,Haozhen Dou,Luhong Zhang,Bin Jiang,Deqiang Wang
Electrochemical water splitting, which is economical and sustainable, has been considered as one of the most potential methods to produce large amounts of hydrogen with high purity. However, the development of uniformly dispersed electrocatalysts with robust catalytic activity and high stability for electrochemical water splitting still faces great challenges. In this study, poly(ionic liquid) (PIL) was used as a bridge between the polyoxometallate and the reduced graphene oxide (RGO) to anchor Mo uniformly on the surface of the RGO. As a result, the Mo2C-RGO exhibits excellent activity in hydrogen evolution reactions in acidic media with a small overpotential of 99 mV to drive 10 mA cm–2 and a low Tafel slope (54.6 mV dec–1) in acidic solution, and no significant degradation was observed after 20 h of operation. This facile strategy offers new opportunities to accurately design functional 2D materials with unique properties.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2019
·Vol. 33
·期 4
·e4719
·
IF 3.259
Beibei Wang,Xiaoli Sheng,Yuming Zhou,Zhiying Zhu,Yonghui Liu,Xiao Sha,Chao Zhang,Huaying Gao
A novel strategy was proposed for the fabrication of high-performance acidic mesoporous poly ionic liquids catalyst. In this work, mesoporous poly ionic liquids (MPILs) were synthesized with P123 (PEO 20 PPO 70 PEO 20 ) served as pore-forming agent. Then, MPILs were treated with PW 3− anion exchange, thereby fabricating PW/MPIL-S(x). MPIL and PW/MPIL-S(x) were characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM), Thermogravimetric analysis (TA), N 2 adsorption–desorption and Fourier transform infrared (FT-IR) spectra and X-ray photoelectron spectroscopy (XPS) spectra. The effect of solvent and concentration of P123 on the morphology and mesoporous structure of MPILs were investigated systematically. And the results show that MPILs were featured with mesoporous channel structure, high surface area (up to 737 m 2 /g) and large pore volumes (1.16 cm 3 /g), which benefit heterogeneous phase reaction (such as, alkylation of styrene with o -xylene). In the alkylation reaction, under optimal reaction conditions, the catalyst PW/MPIL-THF (4.0 g) shows high conversion of styrene (100%) and PXE yield (96.21%), demonstrating the excellent catalytic activities. Furthermore, PW/MPIL-S(x) are easy to be separated from the catalytic system by filtration and show no obvious decrease in catalytic activity after 6 cycle runs. The obtained PW/MPIL-S(x) catalyst exhibit high thermal and mechanical stability as well, indicating extensive application in high temperature acidic catalysis. This work might open up a new method for the synthesizing of porous polymer catalysts in the future.
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JOURNAL OF CHROMATOGRAPHY A
·
2018
·
IF 3.716
Jie Tang,Siwei Liang,Bing Dong,Yao Li,Shun Yao
Emulsion liquid membrane (ELM) coupled with tropine-based ionic liquid was prepared and successfully adopted for the extraction and quantitative analysis of tropane alkaloids (TA) in Radix physochlainae . Effects of formation conditions of ELM were explored and then optimized; the ideal oil-water mass ratio was determined to be 1:2.5, chloroform, Span 80 and 0.05 mol L −1 N -propyl-tropine hexafluorophosphate ([C 3 Tr][PF 6 ]) aqueous solution were stirred for 30 min with the speed of 1500 r min -1 . In order to extract and enrich TA with ELM efficiently, key factors related with their extraction efficiency such as stirring speed, volume of the extracts (feed solution), migration time and initial concentration of TA were systematically investigated. Under optimal conditions, 1.5 mL extracts containing 1.6 mg mL −1 of TA was stirred with ELM at 250 r min -1 for 5 min, the extraction efficiency of target alkaloid can reach 94.14%. Finally, the method could be used in quantitative analysis of TA in herbal material and patent medicine after demulsification. By comparison, application of ELM for the enrichment and quantitation of TA offers a more straightforward and effective strategy, which is expected to provide a meaningful reference for similar separation processes.
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GREEN CHEMISTRY
·
2019
·Vol. 21
·期 14
·3891-3901
·
IF 9.405
Zhencai Zhang,Fei Xu,Hongyan He,Weilu Ding,Wenjuan Fang,Wei Sun,Zengxi Li,Suojiang Zhang
The utilization of renewable resources and carbon dioxide (CO2) has attracted extensive attention due to global warming and continuously declining petroleum-based resources. Herein, a novel synthetic approach of bio-based polycarbonates using isosorbide (ISB) and diphenyl carbonate (DPC), derived from the renewable resources glucose and CO2, respectively, was proposed, where an ionic liquid (IL) was used as a promising green catalyst; to overcome the poor activity of the endo-hydroxyl group (endo-OH) of ISB and achieve high-molecular weight polycarbonates, a new strategy was revealed that involved the activation of the endo-OH group via a series of efficient tetrabutylphosphonium-based IL catalysts. By designing the structures of cations and anions, most of the endo-OH groups have been activated and incorporated into the polymer chain, and the ratio of endo-OH/exo-OH at the end group of the polymer chain has been decreased to 0.25, which, to the best of our knowledge, is the lowest value reported to date. Among the prepared ILs, tetrabutylphosphonium acetate in a trace amount (1.5 × 10−6 mol) exhibited highest catalytic performance, and poly(isosorbide carbonates) (PICs) with the molecular weight of up to 66 900 g mol−1, Tg of 169 °C and better thermal stability than conventional polycarbonates were achieved. Mass spectrometry and density functional theory calculations provided a deeper understanding of the underlying cation–anion synergistic catalytic mechanism. Furthermore, copolymerization of ISB, diols and DPC was performed to modify the flexibility of PIC, resulting in copolycarbonates with the high molecular weight of 110 000 using 1,10-decanediol as a copolymer monomer.
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危险品化学品经营许可证（带存储）