ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Qiang Zhao,Hao Zhou,Weixiang Wu,Xiaoyun Wei,Shunli Jiang,Tong Zhou,Dayang Liu,Qing Lu
In this study, a sensitive electrochemical method for tetrabromobisphenol A (TBBPA) detection was presented based on an poly(diallyldimethylammonium chloride) modified graphitic carbon nitride-N-butylpyridinium hexafluorophosphate doped carbon paste electrode (CPE). Interestingly, in contrary to the poor electrical conductivity, graphitic carbon nitride (g-C 3 N 4 ) was found to improve the electrochemical performance of the pure CPE. N-butylpyridinium hexafluorophosphate (NBH), a kind of ionic liquid, was tended to promote the charge transfer of the g-C 3 N 4 doped CPE. While g-C 3 N 4 and NBH were doped into CPE, the g-C 3 N 4 -NBH composite presented better promotion to the oxidation of TBBPA. After the parameters were optimized, TBBPA was detected with differential pulse voltammetry in the range of 1 nM to 30 nM and 30 to 500 nM with the detection limit of 0.4 nM. The prepared electrode owned the advantages of fairly simple, green and pleasurable sensitivity. Finally, it also could be used to detect TBBPA in the practical samples.
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RSC Advances
·
2017
·Vol. 7
·期 36
·22256-22262
·
IF 3.108
Xiafei Guo,Aiziguli mulati,Mian Wu,Jie Zhang,Liu Yang,Faqiong Zhao,Baizhao Zeng
A novel poly(indole-co-3-methylthiophene)–ionic liquid (i.e., 1-allyl-3-vinylimidazolium bis((trifluoromethyl)sulfonyl)imide) (P(In–3-MeT)/IL) composite film was electrodeposited on a stainless steel wire for headspace solid phase microextraction. The obtained P(In–3-MeT)/IL coating was rough and showed a cauliflower-shape. It had high thermal stability (up to 450 °C) and mechanical stability and could be used for at least 180 times in solid phase microextraction (SPME) without a decrease in extraction performance. The coating exhibited high extraction capacity for some polycyclic aromatic hydrocarbons (e.g. naphthalene, 1-methylnaphthalene, acenaphthene, biphenyl, fluorene and phenanthrene) due to the strong hydrophobic and π–π interactions between the analytes and P(In–3-MeT)/IL. Through coupling with GC, good linearity (correlation coefficients higher than 0.9994), wide linear ranges (0.05–50 μg L−1) and low limits of detection (6.25–25.2 ng L−1) were achieved for these analytes. The reproducibility (defined as RSD) was 3.5–5.5% and 4.5–7.2% for single fiber (n = 5) and fiber-to-fiber (n = 5), respectively. The SPME-GC method was successfully applied for the determination of three real samples, and the recoveries for standards added were 86.8–105% for mosquito-repellent incense, 89.9–110% for cigarettes and 82.3–103% for industrial lubricant.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2016
·
IF 1.835
Lifeng Zhang,Xiaoxing Lu,Dengfeng Ye,Yongsheng Guo,Wenjun Fang
The ionic liquid (IL), 2,2-diethyl-1,1,3,3-tetramethylguanidinium ethyl sulfate ([(C2)22(C1)2(C1)23gu][C2OSO3]), was synthesized and characterized. The density and viscosity data were determined for the binary mixtures of [(C2)22(C1)2(C1)23gu][C2OSO3] with water, methanol, or ethanol over the whole concentration range at different temperatures T = 293.15–323.15 K and atmospheric pressure p = 0.1 MPa. The excess molar volume, VmE, and viscosity deviation, Δη, for the binary mixtures are calculated and fitted with the Redlich–Kister type polynomial equation. The values of VmE for [(C2)22(C1)2(C1)23gu][C2OSO3] + water system are observed to be negative, and those for [(C2)22(C1)2(C1)23gu][C2OSO3] + methanol/ethanol system change from negative to positive against the mole fraction (x1) of the IL, which exhibit the minimum values around x1 = 0.2 and the maximum values near x1 = 0.8. The Δη values for all of the three binary systems are negative, and the minimum values occur near x1 = 0.6. The temperature dependence of viscosity for pure [(C2)22(C1)2(C1)23gu][C2OSO3] and its binary mixtures can be well correlated with the Vogel–Fucher–Tammann equation. These fundamental physicochemical properties of the binary mixtures make for a better comprehension of the guanidinium-based ILs and the potential applications.
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JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Youhong Ai,Mian Wu,Lulu Li,Faqiong Zhao,Baizhao Zeng
The present work reports the electrochemical fabrication of an ionic liquid functionalized multiwalled carbon nanotubes–polyaniline (MWCNT@IL/PANI) nanocomposite coating and its application in the headspace-solid phase microextraction (HS-SPME) and gas chromatography (GC) determination of benzoic acid esters (i.e., methyl benzoate, ethyl benzoate, propyl benzoate and butyl benzoate). The MWCNTs was firstly functionalized with amine-terminated IL (MWCNT@IL) through chemical reduction, and then was doped in PANI during the electropolymerization of aniline. The resulting coating was characterized by infrared spectroscopy, field emission scanning electron microscopy and thermo gravimetry. It showed net-like structure and had high thermal stability (up to 330 °C). Furthermore, it presented high selectivity for the four benzoic acid esters and thus suited for their HS-SPME–GC determination. Results showed that under optimized extraction conditions, the detection limits were less than 6.1 ng L −1 (S/N = 3) and the linear detection ranges were 0.012–50 μg L −1 ( R ≥ 0.9957) for these analytes. The relative standard deviations (RSDs) were lower than 6.4% for five successive measurements with one fiber, and the RSDs for fiber-to-fiber were 4.4–9.6% ( n = 5). The developed method was successfully applied to the determination of these benzoic acid esters in perfume samples.
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CHROMATOGRAPHIA
·
2016
·Vol. 80
·期 1
·23-30
·
IF 1.332
Guo Ruixian,Zhang Doudou,Zhu Xianghui,Tang Liying,Zhang Xuemeng,Bai Ligai,Liu Haiyan
A polymer-based monolithic column was prepared for high-performance liquid chromatography (HPLC), using ionic liquids as porogen within the confines of a stainless steel column (50 × 4.6 mm i.d.). In the process, 1-butyl-3-methylimidazolium chloride and dodecyl alcohol were used as bi-porogens, vinyl ester resin as the monomer, ethyleneglycol dimethacrylate as the crosslinker, CCl 4 as the initiator, and FeCl 2 as the catalytic agent to prepare the polymer-based monolithic column. Scanning electron microscopy, nitrogen adsorption–desorption instrument, and mercury intrusion porosimetry were used to assay the characteristics of the monolith, respectively. The optimized monolith showed uniform structure and good permeability. Then, the column was used as the stationary phase of HPLC to separate standard proteins and human plasma with gradient elution. Besides, the monolith was used to separate aromatic compounds from the mixture. The results showed that the addition of IL could effectively improve the structure of monoliths prepared by atom transfer radical polymerization technique. The results also suggested that this kind of monolith could be used as a simple, cheap and effective stationary phase for HPLC.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
·
IF 3.359
Lixi Chen,Ying Wang,Xiangyang Yuan,Yi Ren,Ning Liu,Lihua Yuan,Wen Feng
Three phosphine oxide functionalized pillar[5]arenes (POP5A) were evaluated for the extraction of uranyl ion from nitric acid feed solutions in room temperature ionic liquid (RTIL), 1-n-octyl-3-methylimidazolium hexafluorophosphate (C 8 mimNTf 2 ). The host-guest interaction between POP5A and C 8 mim + for the formation of [POP5A C 8 mim] + complex was evidenced by 1D and 2D proton NMR spectroscopy and mass spectra technique before extraction, and also supported by theoretical calculation. High extraction efficiency and selective separation of UO 2 2+ were achieved with the ligand bearing longer spacer exhibiting best solvent extraction performance. The distribution ratios of U(VI) in RTIL were significantly enhanced in the range of 0.1–1.8 M HNO 3 as compared with organic diluent. The extracted species were ascertained from the slope analysis method as well as Job plots method, and a supramolecular cation-exchange mechanism involving competitive host-guest interactions was found to dominate the extraction process. This extraction system was also examined for its ability towards extraction of lanthanides and Th 4+ . The results revealed an excellent selectivity towards UO 2 2+ over other metal ions. Stripping experiments showed almost a complete back extraction of UO 2 2+ within four stages. With high selectivity towards UO 2 2+ and efficient back extraction, this new POP5A-RTIL extraction system shows promise for future application of uranium recovery.
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2016
·
IF 0.566
Ya-Li WANG,Li-Qin YOU,Yu-Wen MEI,Jian-Ping LIU,Li-Jun HE
A benzyl functionalized ionic liquid, 1-benzyl-3-methylimidazolium bis [(trifluoromethyl) sulfonyl] imide ([BeMIM][Tf 2 N]), was synthesized and used as an extraction solvent of dispersive liquid-liquid microextraction (DLLME) for enrichment and determination of 5 kinds of organophosphorus pesticides (phoxim, fenitrothion, chlorpyrifos, phorate and parathion) and 2 kinds of aromatic compounds (chloronaphthalene and anthracene) in environmental water samples by high-performance liquid chromatography (HPLC). [BeMIM][Tf 2 N] had higher extraction efficiency than 1-octyl-3-methylimidazolium bis [(trifluoromethyl)sulfonyl] imide and common organic solvents such as carbon tetrachloride and tetrachloroethylene. The extraction was performed using 40 μL of [BeMIM][Tf 2 N] as respective extraction solvent and 1 mL of methanol as dispersive solvent with centrifugal time of 5 min. Under the optimal conditions, the proposed method exhibited a good linearity for all analytes with correlation coefficients of 0.9994−0.9998. The precision, described as intra-day and inter-day relative standard deviations (RSDs) of five replicate experiments at three different concentrations of 10, 40 and 100 μg L −1 , was 1.1%–4.3% and 0.8%–4.8%, respectively. The limits of detection (LODs) were 0.01–1.0 µg L −1 ( S/N = 3). The developed method was convenient, rapid and applicable to detection of the analytes in real environmental water samples with satisfactory recovery of 82.7%–118.3% and RSDs of 0.7%–5.6%. Introduction of benzyl group into the imidazolium could considerably elevate the extraction efficiecny of the analytes due to enhanced π-π interaction between [BeMIM][Tf 2 N] and analytes. [BeMIM][Tf 2 N] was a satisfactory extraction solvent with a high enrichment factor of 339 and extraction efficiency of 81.4%. The partition coefficients of all analytes in [BeMIM][Tf 2 N]-DLLME system were determined and the extraction mechanism was discussed.
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Journal of Cleaner Production
·
2017
·
IF 5.715
Tong Wang,Cheng-Bo Gu,Sui-Xin Wang,Ping Kou,Jiao Jiao,Yu-Jie Fu
Recently, integrated and sustainable methods for extraction, transformation and purification of value-added compounds have gained increasing attention. In the present study, ionic liquid (IL)-acid based pH-dependent aqueous two-phase system (ATPS) was developed for simultaneous transformation psoralic acid-glucoside into psoralen, extraction and purification of psoralen from fig leaves for the first time. The cleaner [Bmim]Br-citric acid mixture showed enhanced transformation and extraction efficiency. The extraction yield of psoralen by [Bmim]Br-citric acid mixture was 1.45, 2.45 and 3.68 times higher than that of by [Bmim]Br-water, ethanol-critic acid and ethanol, respectively. The cleaner [Bmim]Br-citric acid based ultrasound extraction and transformation process was optimized using response surface method (RSM). Under optimum conditions, the maximum extraction yield of psoralen was 31.22 mg/g. Subsequently, we investigated and optimized the pH-dependent aqueous two-phase process. Under optimum conditions, the maximum recovery yield of psoralen was 96.34%. These results indicated that our method was efficient and had great potential for producing psoralen from fig leaves in large scale. What's more, this method could also been used to produce value-added compounds from other raw materials.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2017
·Vol. 21
·期 8
·2355-2364
·
IF 2.316
Wang Ailian,Xu Hao,Zhou Qian,Liu Xu,Li Zhengyao,Gao Rui,Liu Xiangfeng,Zhang Liaoyun
A new composite polymer electrolyte membrane composed of hyperbranched star polymers (HBPS-(PMMA- b -PPEGMA) 30 (the hyperbranched star polymer with hyperbranched polystyrene as core and polymethyl methacrylate block poly(ethylene glycol) methyl ether methacrylate) as arms)), ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate (BMImBF 4 ) or 1-butyl-3-methylimidazolium hexafluorophosphate (BMImPF 6 )), and lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) has been fabricated by solution casting method. This type of solid polymer electrolyte membrane shows an excellent flexibility, transparency, and free-standing properties. Room temperature ionic conductivity of composite electrolytes with 40 wt% BMImBF 4 or 40 wt% BMImPF 6 can reach 2.5 × 10 −4 and 4.1 × 10 −5 S cm −1 , respectively. The HBPS-(PMMA- b -PPEGMA) 30 /BMImPF 6 /LiTFSI (the composite polymer electrolyte with 1-butyl-3-methylimidazolium hexafluorophosphate) composite polymer electrolyte displays better performances including a good thermal stability with decomposition temperature of 350 °C, a wide electrochemical window with oxidation potential of 4.3 V, and the excellent interfacial compatibility with lithium electrode. Moreover, the Li/LiFePO 4 batteries based on HBPS-(PMMA- b -PPEGMA) 30 /BMImPF 6 /LiTFSI electrolyte retain about 96% of their highest discharge capacity (120.5 mAh g −1 ) after 100 cycles under a current density of 0.1 C at 60 °C, exhibiting the excellent reversible cyclability.
The free-standing composite electrolyte films composed of ionic liquids, hyperbranched star polymers and lithium salts show the high ionic conductivities.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2017
·Vol. 23
·期 30
·7278-7286
·
IF 5.317
Geping Zhang,Hongxia Zhu,Mengjun Chen,Hongguang Li,Ye Yuan,Tiantai Ma,Jingcheng Hao
Graphical Honey trap : Highly-ordered, photoluminescent honeycomb structures with rich electrochemical properties have been fabricated by complexing {Mo 72 Fe 30 } and a room-temperature ionic liquid which bears naphthyl unit and a long, branched aliphatic chain. Honeycomb-structured films represent an intriguing class of two-dimensional porous materials. Specifically, polyoxometalate (POM) macroanions can be introduced into these films by complexing with oppositely charged, double-tailed surfactants. Here highly-ordered honeycomb structures are reported that can be constructed by the complexes between POMs and a room temperature ionic liquid ( IL1 ) having an imidazolium moiety in the middle and a naphthyl unit and a branched aliphatic chain at the ends. The complexes can be produced through phase transfer between an aqueous solution of POMs (typically {Mo 72 Fe 30 }) and a CS 2 (or chloroform) solution of IL1 . Based on the intrinsic properties of {Mo 72 Fe 30 } and the functional groups of the IL1 , the honeycomb structures show multiple functions with bright photoluminescence and rich electrochemical properties. This work shows that by simply engineering the organic ligands involved in the POM-based inorganic–organic complexes, supramolecular structures with improved properties and wide applications can be obtained.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yizhen Su,Fuquan Xiao,Qibin Yuan,Honglei Zhao,Ruiqi Tang,Linhua Zhu,Chunyan Dai
The development of simple and efficient desulfurization catalysts has garnered increasing attention in the field of desulfurization. In this study, comb-grafted polyethylene phosphomolybdenum-vanadium heteropoly acid catalysts (P-VPA-Mo m V n ) were synthesized via the bulk polymerization method. The structure and morphology of the catalysts were investigated by FTIR, GPC, 1 H NMR, XRD, XPS and SEM. By incorporating ionic liquid as an extractant, the P-VPA-Mo 10 V 2 demonstrates high activity in oxidative desulfurization, removing all DBT from the model oil with a low O/S molar ratio under mild conditions. It is noteworthy that when the reaction temperature is 30 °C, the O/S molar ratio is 3, and the reaction time is 60 min, the catalyst exhibits excellent recycling lifetime of 10 cycles without a significant decline in activity. The incorporation of the ionic liquid further enhances its extraction efficiency, indicating that the catalyst not only possesses a stable structure but also holds strong prospects for industrial application.
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CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Dong Fu,Linhui Xing,Yang Xie,Peng Li,Fan Yang,Xin Sui,Jiaying Liu,Jialong Chi,Bo Huang,Jun Shen
Conductive hydrogels (CHs) have demonstrated great potential application in wearable devices as a substitute for traditional rigid metal electrode sensors. However, the design of CHs with excellent mechanical stability for extreme environmental conditions remains a great challenge due to the high water content present in hydrogels. Herein, a novel anti-freezing and anti-drying zwitterionic poly (ionic liquid) organohydrogel was prepared via free-radical polymerization of acrylic acid (AA), 1-propyl-3-vinyl imidazole sulfonate (ZILs), cellulose nanofibers (CNFs) and ferric chloride (FeCl 3 ) in a glycerol/water mixture solvent. The synergistic interaction in the hybrid crosslinking, composed of physical/chemical crosslinking, endowed organohydrogel with desired mechanical properties, including stretchability (1032 %), self-recoverability (∼88 % recovery efficiency after 60 min), and excellent durability (500 cycles with 30 % deformation). Moreover, the organohydrogel exhibited satisfied conductivity (2.99 mS/cm), high strain-sensitive behavior (gauge factor (GF) up to 4.86), and significant sensing stability in a wide temperature range (−20–50 °C) due to the introduction of the binary solvent, the zwitterionic unit of ZILs, and Fe 3+ . Combined with the above advantages, a simple strain sensor was assembled, which offered remarkable real-time sensitivity in detecting human motions. This work provided new insights into the design of flexible sensors for applications in extreme environments.
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