NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 46
·20358-20366
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IF 3.288
Yan Gao,Ziyan Lv,Ruimin Gao,Guangfa Hu,Jianshe Zhao
Due to the increasingly severe environmental pollution, there is an urgent need to find a new catalyst with high efficiency and stability for deep desulfurization of fuels. In this work, hybrid material based on vanadium-substituted Dawson type polyoxometalate and poly ionic liquid was facilely prepared and successfully loaded on different carbon materials to produce a supported catalyst for oxidative desulfurization. The test result shows that the catalyst P[C2VP]MoV/AC possesses high activity with the DBT conversion of 99.2%. At the same time, the catalyst with large specific surface area has more opportunities to react with sulfides and thus possesses high activity. According to the kinetic study, it is confirmed that the oxidation reaction of DBT follows first-order kinetics.
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JOURNAL OF SEPARATION SCIENCE
·
2020
·Vol. 43
·期 14
·2827-2833
·
IF 2.878
Zichun Liu,Wei Zhou,Chenlu Wang,Wei Hu,Zilin Chen
Cotton fiber is a biodegradable material that possesses properties such as high specific area, adjustable shape, and hygroscopicity. In this work, organic polymer was directly in situ grown on the surface of cotton thread and packed into a poly(ether ether ketone) tube for online in-tube solid-phase microextraction. The novel strategy solves the problems like high backpressure and tedious optimization process of normal monolithic polymer-based in-tube solid-phase microextraction capillary. The quaternary ammonium typed ionic liquid of 1-allyl-methylimidazolium chloride, 4-vinylbiphenyl, and ethylene dimethacrylate were co-polymerized and in situ grown on the surface of cotton thread as extraction phase. The solid-phase microextraction tube showed excellent performance for the extraction of three nonsteroidal anti-inflammatory drugs including ketoprofen, naproxen, and flurbiprofen due to the strong ion exchange and hydrophobic interactions. After online coupling with a high-performance liquid chromatography system by six-port valve, the method was applied for the quantitative analysis of nonsteroidal anti-inflammatory drugs in human plasma samples showing good enrichment performance (enrichment factor between 263 and 279), high sensitivity, good linearity, and good reproducibility.
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TALANTA
·
2020
·
IF 5.339
Xiaopeng Hu,Caiyun Wang,Meng Zhang,Faqiong Zhao,Baizhao Zeng
Accurate and early diagnosis of zearalenone (ZEN) is particularly significant to the food safety. Herein, we propose an ionic liquid assisted self-assembly molecular imprinting strategy for ZEN based on ionic liquid functionalized boron-doped ordered mesoporous carbon -gold nanoparticles composite (BOMC-IL-Au NPs). During the composite synthesis, increased well-dispersed and uniform Au NPs are deposited on the surface of IL modified BOMC, due to the strong electrostatic interaction between AuCl 4 − and positively charged IL. For molecular imprinting, the BOMC-IL-Au NPs/GCE is immersed into p-aminothiophenol (p-ATP) solution and template solution in turn. Thus, the mercapto group contained p-ATP self-assembles on the Au NPs. Subsequently, the template molecules self-assemble onto the composite to form dense template layer, because of the hydrophobic interaction, π-π and hydrogen bond between template and IL/or p-ATP. After electropolymerization, the template layer is embedded into the p-ATP polymer membrane and produces lots of imprinting sites. Hence, the obtained sensor exhibits high sensitivity and selectivity. Under the optimal conditions, zearalenone can be quantified from 5 × 10 −4 to 1 ng mL −1 with the low detection limit of 1 × 10 −4 ng mL −1 , by using [Fe(CN) 6 ] 3-/4- probe and square wave voltammetry . This strategy can also be employed to construct sensors for the detection of other substances.
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TALANTA
·
2020
·
IF 5.339
Hang Zhou,Jia Chen,Hui Li,Kaijun Quan,Yingshan Zhang,Hongdeng Qiu
In this work, a novel imidazolium ionic liquid-functionalized poly(quinine)-modified silica stationary phase (Sil-PQn-MIm) was successfully synthesized via surface radical chain transfer and nucleophilic substitution reaction. The modified silica was confirmed by series of characterizations including Fourier transform infrared spectroscopy (FT-IR), elemental analysis (EA), transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). The multi-mode chromatographic performances of the Sil-PQn-MIm column were investigated by anion-exchange mode for separation of aromatic acid samples, hydrophilic interaction mode for separation of nucleosides/nucleobases and sulfanilamides , and reversed-phase mode for separation of alkylbenzenes , benzene and polycyclic aromatic hydrocarbons (PAHs), and the Tanaka test mixtures, respectively. As expected, compared to the Sil-PQn column only with quinine as functional group, the Sil-PQn-MIm column further modified by imidazolium ionic liquid possessed higher separation performance, especially for the separation of nucleosides/nucleobases. The effects including buffer concentration, pH, organic solvent content and column temperature on chromatographic performance were studied, which proved that multiple interactions including electrostatic, hydrophobic and hydrophilic interactions can be simultaneously existed between the stationary phase and the analytes. In addition, reproducibility and efficiency of the Sil-PQn-MIm column were also investigated, the results illustrated that the stationary phase have good enough reproducibility (RSDs 0.15%–0.72%, n = 7) and high efficiency (plates per meter, ~90000 plates/m). In conclusion, the prepared stationary phase with multiple-mode retention capabilities could realize separation for various types of samples by optimizing chromatographic conditions, even for some chiral compounds.
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JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Yitan Wang,Li Chen,Yongsheng Yan,Ji Chen,Jiangdong Dai,Xiaohui Dai
Adjacent rare earth separation has always been one of the hardest separation tasks around world. In this article, a task-specific ionic liquid Cyphos IL 104 embedded polymer inclusion membrane (PIM) was fabricated to realize the adsorption and separation of adjacent heavy rare earth elements Lutetium (III) and Ytterbium (III). Chemical composition of the PIM was verified by attenuated total reflectance Fourier transformed infrared spectroscopy and X-ray photoelectron spectroscopy. And results confirmed only P O and P–O groups participated in the formation of Rare Earth (III)-Cyphos IL 104 complex. A typical thumb-like asymmetric structure was observed by scanning electron microscopy. And the addition of Cyphos IL 104 promoted the hydrophilicity of the PIM as the water contact angle became smaller. Static adsorption and dynamic transport performances were studied in details to get the optimum separation condition. The permeability coefficients of Yb(III) and Lu(III) were 156 μm s −1 and 114.82 μm s −1 , respectively; And the initial membrane fluxes were 90.17 μm m −2 s −1 and 65.61 μm m −2 s −1 , respectively. The separation factor between Yb(III) and Lu(III) was calculated as 1.37 under the optimized transport condition. All these would provide promising developments of adjacent heavy rare earth separation with an efficient and practical membrane strategy.
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MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Yuan Li,Yutong Li,Yan Wang,Guodong Ma,Xinsheng Liu,Yonghong Li,Jeffrey Soar
1-hydroxypyrene (1-OHP) is an important biomarker for evaluating human exposure to polycyclic aromatic hydrocarbons (PAHs). In this work, a simple sensor based on nano-carbon paste electrode modified with zeolitic imidazolate frameworks (ZIF-8)/ionic liquid composites was developed for convenient and fast electrochemical detection of 1-OHP. The structure of ZIF-8 and the morphologies of different electrodes were investigated by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The electrochemical behavior of l-OHP on the constructed modified electrode was studied using differential pulse voltammetry (DPV). Under the optimized conditions, the fabricated sensor gave a linear calibration curve of the concentration ranging from 0.05 to 20 μM with a detection limit of 0.01 μM for 1-OHP. The proposed method was successfully applied to the determination of 1-OHP in urine samples with the recoveries of 94.2%–103.2%.
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Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 37
·12984-12992
·
IF 7.059
Awais Siddique Saleemi,Muhammad Hafeez,Aqsa Munawar,Naeem Akhtar,Waseem Abbas,Muhammad Ehsan Mazhar,Zahid Shafiq,Anthony P. Davis,Shern-Long Lee
Arsenic(III) poisoning may lead to neurological disorders, heart diseases or carcinogenic effects due to long-term exposure. The presence of arsenic in drinking water is a widespread problem and presents an important analytical challenge. Among the methods for As(III) monitoring, electrochemical analysis offers fast response, low detection limits and high sensitivity. Here we report a novel system, which achieves exceptional performance without use of expensive noble metals by exploiting a metal oxide rich in oxygen vacancies (OVs). Novel OV-rich spinel ZnFe2O4 microspheres (ZF-Ms) were synthesized and applied to electrochemical monitoring of As(III) in underground drinking water by square wave anodic stripping voltammetry (SWASV) in acetate buffer (pH 6.0). To boost sensing capability, the surface of ZF-Ms was further wrapped with carbon and nitrogen rich nanodots (CNs) and modified with benzimidazolium-1-acetate ionic liquid (IL). The designed CN-wrapped IL-modified ZF-Ms (CN@ZF-Ms-IL) sensor offered an ultra-low detection limit of 0.0006 ppb (based on the 3σ method), high sensitivity (41.08 μA ppb−1) and a wide linear range (∼1–60 ppb) including the World Health Organization (WHO)'s desirable range (10 ppb). To the best of our knowledge, the system outperforms most alternatives based on noble metal electrodes and almost all those based on the reported metal-free electrochemical sensors. A possible sensing mechanism is proposed and supported with experimental evidence. Additionally, the system has been successfully applied to monitor arsenic-contaminated real ground drinking water collected from a flood-affected area, Muzaffargarh, Punjab, Pakistan.
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NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 47
·18935-18942
·
IF 3.069
Cheng-Long Geng,Le-Qing Fan,Chun-Yan Wang,Yong-Lan Wang,Si-Jia Sun,Ze-Yu Song,Na Liu,Ji-Huai Wu
To increase the energy density of quasi-solid-state supercapacitors, a redox-active gel polymer electrolyte (GPE) was prepared by evaporating the excess water in a neutral gel that consists of polyvinyl alcohol (PVA), Na2SO4 and the ionic liquid (IL) N-butyl-N-methylpyrrolidinium bromide (Pyr14Br). The influence of IL Pyr14Br on the ionic conductivity of GPE was investigated. The maximum ionic conductivity of PVA–Na2SO4–Pyr14Br GPE can reach 27.1 mS cm−1. The optimized GPE was assembled with two activated carbon electrodes into a quasi-solid-state supercapacitor. The electrochemical performances of this supercapacitor were evaluated by cyclic voltammetry, galvanostatic charge/discharge, electrochemical impedance spectroscopy and self-discharge measurements. The assembled supercapacitor exhibits a high energy density of 33.0 W h kg−1, which is due to the wide working voltage (2.0 V) as a result of the strong solvation of Na+ cations and SO42− anions and the production of an additional pseudocapacitive contribution from the Br−/Br3− redox reaction at the electrolyte/electrode interface. This supercapacitor exhibits outstanding cyclic stability with an 81.0% capacitance retention ratio after 8000 charge/discharge cycles. Moreover, this supercapacitor presents good self-discharge behavior.
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Polymers
·
2019
·Vol. 11
·期 12
·2004
·
IF 3.164
Zhixin Zhao,Bei Lei,Wenhao Du,Xi Zhang
1-butyl-3-methylimidazole chloride ((BMIM) Cl) modified starch/poly (butylene succinate) (PBS) blends with different anions of inorganic salts were prepared by HAAKE mixer. The compatibility and thermal behaviors including crystallinity, crystallization and melting temperature, thermal stability and mechanical properties were systematically investigated by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and X-ray diffraction (XRD). The results show that inorganic salts can produce a strong interaction with starch/PBS blends, which can improve the mechanical properties of starch/PBS blends, enhance the mechanical strength and elongation at break of starch/PBS blends, meanwhile, the thermal stability of starch/PBS blends decreased. The SEM images reveal that the compatibility of starch/PBS become better with the increase of inorganic salts. The melting and crystallization absorption peaks in the DSC curves show that the melting enthalpy (ΔHm), crystallinity (Xc), and crystallization temperature (Tc) of the blends decrease and the cold crystallization temperature (Tcc) increase when inorganic salts is added. Moreover, inorganic salts with smaller anionic radius have much better effects on the starch/PBS blends plasticized with ((BMIM)Cl).Keywords:poly(butylene succinate);starch;inorganic salts;ionic liquid;anion;modification
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高影响因子
ANALYST
·
2019
·Vol. 144
·期 23
·6989-7000
·
IF 4.019
Alula Yohannes,Shun Yao
The application of ionic liquids (ILs) for the separation of bioactive compounds from various sample matrices is a burgeoning area. Here, a class of porous materials called metal–organic frameworks (MOFs) were combined with tropine-based ILs having structural similarity with natural tropane alkaloids for the quantitative analysis of Huashansheng tablets. Three MOFs (MIL-101, HKUST-1 and ZIF-8) were used to form the composite with the a tropine-based IL (N-propyl-substituted tropine hexafluorophosphate, [C3tr][PF6]), using the ship-in-a-bottle (SIB) synthesis approach. The performance of the hybrid IL/MOF composite (IL@MOF) was evaluated as a potential sorbent for application in the dispersive solid-phase-extraction-based enrichment of tropane alkaloids, followed by chromatographic analysis. It was found that [C3tr][PF6]@MIL-101 exhibited excellent adsorption capacity, and the extraction results showed satisfactory recoveries in the range of 91.5–104.7% (RSD < 5%). Further, the limit of detection went down to 10–20 μg L−1 with a linear range from 100–500 μg L−1, which proved that an adsorbent with the same nucleus as the target objects would be more suitable and efficient for their later extraction.
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JOURNAL OF CHROMATOGRAPHY A
·
2022
·
IF 4.601
Pengzhao Han,Kai Hu,Yuanpeng Wang,Lixin Li,Pan Wang,Weixia Zhu,Haiyan Gong,Zhenqiang Zhang,Shusheng Zhang
In this work, Friedel-Crafts alkylation was successfully applied to prepare a magnetic ionic liquid hypercrosslinked polymer composite (Fe 3 O 4 @IL-HCP), which was subsequently employed as magnetic solid-phase extraction (MSPE) adsorbent for the isolation and enrichment of trace non-steroidal anti-inflammatory drugs (NSAIDs). The developed composite was comprehensively characterized using various techniques, with the results indicating that it possessed high saturation magnetization (39.44 em g − 1 ), large specific surface area (175 m 2 g − 1 ), and high adsorption capacity for NSAIDs. The adsorption behavior and mechanisms were also investigated in detail. NSAIDs were adsorbed onto the Fe 3 O 4 @IL-HCP sorbent via a heterogeneous multilayer process consisting of hydrogen bonding and π-π and electrostatic interactions. Additionally, the composite's large surface area and multiple active sites enabled extraction equilibrium within 6 min. By coupling with high performance liquid chromatography (HPLC), the developed MSPE/HPLC method was applied for the determination of selected NSAIDs in water and urine samples. The developed method displayed wide linear ranges, low limits of detection (0.12–0.30 ng mL −1 and 0.15–1.5 ng mL −1 in water and urine samples, respectively), sufficient recoveries (92.8–109%), and good precision (relative standard deviations ≤ 4.6%). Thus, the findings of this work provide an appealing alternative for the extraction and determination of trace NSAIDs in environmental water and biological samples.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Fanzhi Meng,Tongyao Ju,Siyu Han,Li Lin,Jinglin Li,Kailun Chen,Jianguo Jiang
The biphasic amine solvent based on ionic liquid could effectively improve the efficiency of carbon dioxide capture and regeneration, greatly reduce the energy consumption of regeneration, and hold an excellent application prospect in the field of large-scale biogas upgrading. In this work, a biphasic mixed amine system consisting of Methyl monoethanolamine (MMEA), N-methyldiethanolamine (MDEA), and 1-butyl-3-methylimidazolium tetrafluoroborate (BF) was prepared for the removal of trace components and CO 2 during biogas upgrading and compared with traditional 30 wt% MEA and mixed amine solution of MMEA and MDEA for biogas upgrading. The results showed that H 2 S and NH 3 would chemically react with the biphasic solvent and thus facilitate the removal of trace components, and that the reacted solution would not affect its regeneration characteristics and could basically be recycled at a regeneration temperature of 125 °C. In addition, the phase separation efficiency of the biphasic agent was not affected by the introduction of trace components, and all reaction products except the ionic liquid were enriched in the rich phases and the carbon enrichment rate reached about 98%, which reduced regeneration energy consumption by 44.07% compared to 30 wt% MEA. Finally, the mechanism of phase separation of reaction products and ionic liquids was discussed in the context of quantum chemical calculations, and the importance of intermolecular van der Waals forces in the phase separation process was clarified, and the reasons for the appearance of phase separation phenomena were explained.
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