CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2016
·Vol. 32
·期 4
·630-633
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IF 1.086
Zhu Jian,Jin Zhimin
After being hydrolyzed into corresponding hydrosoluble carboxylate by 1,1,3,3,-tetramethylguanidine (TMG), camptothecin was extracted via the aqueous two-phase systems composed of ionic liquid 1,1,3,3-tetramethylguanidinium(TMGM) carboxylate and K 2 CO 3 , and was regenerated at the final by dilute aqueous hydrochloric acid. Among the ionic liquids, TMGM benzoate showed the best effect, TMGM formate the worst, this results were consistent with the liposolubilities of different carboxylic acid components in the ionic liquids. Through two-step extraction of TMGM benzoate ionic liquid/K 2 CO 3 aqueous two-phase at a favorable condition, camptothecin was obtained in a purity of 98.3% and a total yield of 85.1%, from the crude camptothecin extract with a purity of 14.2%.
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ACS Sustainable Chemistry & Engineering
·
2016
·
IF 5.267
Huan Ren,Min-Hua Zong,Hong Wu,Ning Li
The biorefineries of lignocellulosic biomass have attracted increasing interest recently. However, large water consumption in the large-scale biorefineries remains a major problem. In this work, utilization of abundant seawater as an alternative to freshwater for ionic liquid (IL) pretreatment of lignocellulosic biomass was reported for the first time. In addition, enzymatic hydrolysis of IL-pretreated biomass and microbial lipid production from wheat straw hydrolysate were conducted in seawater. It was found that seawater had no significantly negative effect on enzymatic hydrolysis as well as IL pretreatment. After grass lignocelluloses were pretreated by 50% cholinium IL–seawater mixtures at 90 °C for 6 h and washed by seawater, the residues became highly susceptible to enzymatic hydrolysis; the reducing sugar yields of 54–72% were obtained in pH 4.8 seawater in the subsequent enzymatic hydrolysis of the residues. The lipid yield of 4.5 g/L and lipid coefficient of 0.21 g/g of sugar were achieved after cultivation of Trichosporon fermentans on wheat straw hydrolysate with the sugar concentration of approximately 30 g/L for 3 days.
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 40
·21362-21369
·
IF 8.867
Xiaowei Li,Zhengxi Zhang,Sijian Li,Kaihua Yang,Li Yang
In developing all-solid-state polymer electrolytes for wide operating temperature range lithium metal batteries, an exciting organic ionic plastic crystal, N-ethyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide (P12FSI), has been introduced into the pyrrolidinium-based polymeric ionic liquid (PIL)/LiTFSI solid system to obtain a novel class of PIL–P12FSI–LiTFSI solid polymer electrolytes (SPEs). Such SPEs reveal flexible mechanical characters, attractive room temperature ionic conductivity above 10−4 S cm−1, and high thermal and electrochemical stability as well as potential to suppress the lithium dendrite growth. Particularly, Li/LiFePO4 cells assembled with the as-obtained SPE exhibit high discharge capacity and excellent cycle life over a broad operating temperature range (25–80 °C) and good rate performance. This significant finding indicates that the SPE system obtained in our work has great potential for use in wide operating temperature range lithium metal batteries.
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ANALYST
·
2015
·Vol. 140
·期 10
·3474-3483
·
IF 4.107
Jing Chen,Yuzhi Wang,Yanhua Huang,Kaijia Xu,Na Li,Qian Wen,Yigang Zhou
A novel adsorbent based on silica-coated magnetic multiwall carbon nanotubes (MWCNTs) surface modified by dual hydroxy functional ionic liquid (FIL) ([OH]-FIL-m-MWCNTs@SiO2) has been designed and used for the purification of lysozyme (Lys) by magnetic solid-phase extraction (MSPE). Fourier transform infrared spectroscopy (FTIR), a vibrating sample magnetometer (VSM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and thermogravimetric analysis (TGA) were employed to characterize [OH]-FIL-m-MWCNTs@SiO2. After extraction, the concentration of Lys was determined by a UV-Vis spectrophotometer at 278 nm. A series of single-factor experiments were carried out to identify the optimal conditions of the extraction and the extraction amount could reach up to 94.6 mg g−1. The RSD of the precision, the repeatability and the stability experiments were 0.37% (n = 3), 0.47% (n = 3) and 0.52% (n = 3), respectively. Comparison of [OH]-FIL-m-MWCNTs@SiO2 with silica-coated magnetic Fe3O4 (Fe3O4@SiO2), silica-coated magnetic multiwall carbon nanotubes (m-MWCNTs@SiO2) and alkyl quaternary ammonium ionic liquid-modified on m-MWCNTs@SiO2 was carried out by extracting Lys. The extraction of bovine serum albumin (BSA), trypsin (Try) and ovalbumin (OVA) was also done by the proposed method. Desorption of Lys was carried out by 0.005 mol L−1 Na2HPO4–1 mol L−1 NaCl as the eluent solution and the desorption ratio reached 91.6%. Nearly 97.8% of the [OH]-FIL-m-MWCNTs@SiO2 could be recovered from each run, and the extraction amount decreased less after five runs. The circular dichroism spectral experiment analysis indicated that the secondary structure of Lys was unchanged after extraction.
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PubMed
高影响因子
ELECTROPHORESIS
·
2012
·Vol. 34
·期 2
·277-283
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IF 3.303
Libo Li,Hongwei Du,Huan Yu,Lei Xu,Tianyan You
CE coupled with amperometric detection method was developed using ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate (EMImBF 4 ) as additive for the simultaneous detection of clenbuterol (CLB), terbutaline (TER), and ractopamine (RAC) in feed. The effects of detection potential, concentration of EMImBF 4 , pH, and concentration of the running buffer, separation voltage as well as injection time on the separation and detection of these three β -agonists were investigated in detail. Under the optimum conditions: the detection potential at 1.05 V, 50 mmol/L Tris-HAc at pH 8.0 with 0.6% (v/v) EMImBF 4 , electrokinetic injection 6 s at 16 kV and separation voltage at 16 kV, a baseline separation for these three analytes could be achieved within 11 min. Introduction of EMImBF 4 into the running buffer resulted in significant improvement in separation selectivity and enhancement in peak currents for those β -agonists, especially for TER and RAC, which could not be separated in the running buffer without additive. The method exhibited wide linear range with LOD (S/N = 3) of 2, 1, and 2 nmol/L for CLB, TER, and RAC, respectively. The precision was determined in both intraday ( n = 5) and interday ( n = 3) assays, and the RSDs for both migration time and peak current were less than 6%. The proposed method was also applied to analyze β -agonists in feed sample.
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PubMed
高影响因子
TALANTA
·
2015
·
IF 3.545
Yuanyuan Feng,Mian Wu,Faqiong Zhao,Baizhao Zeng
A novel polycarbazole (PCz)–ionic liquid (IL, i.e. 1-hydroxyethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide, [HOEMIm][NTf 2 ]) composite coating (PCz-IL) was fabricated by electrodeposition. The IL could facilitate the electrodeposition of poor-conductive PCz and a more porous coating was obtained. The composite coating exhibited enhanced extraction capacity for some environmental pollutants (i.e. o-chlorotoluene, p-bromotoluene, o-nitrotoluene, m-nitrotoluene, p-nitrotoluene), as they could interact through π-π and hydrophobic interactions. Compared with [HOEMIm][NTf 2 ] coated fiber, some other PCz-IL fibers (here IL=1-hydroxyethyl-3-methylimidazolium hexafluorophosphate and 1-methyl-3-octylimidazolium hexafluorophosphate) and commercial fibers (i.e. polydimethylsiloxane and polyacrylate), the PCz-IL fiber showed better performance. It was used for the determination of the environmental pollutants by coupling with gas chromatography, the limits of detection were 47.8–65.9 ng L −1 under the optimized conditions and the linear ranges were 0.1–500 μg L −1 with correlation coefficients above 0.9947 for different compounds. The relative standard deviations (RSDs) were 3.4–4.6% for five successive extractions with single fiber, and the RSDs for inter-fiber were 6.5–10.4% ( n =5). The fiber was successfully applied to the detection of real samples and the recoveries for standards added were 88.6–108.8% with RSDs below 9.7%.
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PubMed
高影响因子
ELECTROANALYSIS
·
2015
·Vol. 28
·期 1
·96-102
·
IF 2.138
Rui Li,Yanying Wang,Yinghua Deng,Guishen Liu,Xiaodong Hou,Yina Huang,Chunya Li
Reduced graphene oxide (rGO) nanosheets functionalized with 1,3-di(4-amino-1-pyridinium) propane tetrafluoroborate ionic liquid (DAPPT) was successfully synthesized and fully characterized. DAPPT-rGO nanosheets were coated to a glassy carbon electrode (GCE) surface to immobilize tyrosinase (Tyr). The Tyr-DAPPT-rGO/GCE was characterized with scanning electronic microscopy and electrochemical impedance spectroscopy. The biosensor shows a linear response to bisphenol A (BPA) in the concentration range of 1.0×10 −9 ∼3.8×10 −5 mol L −1 . The detection limit was calculated to be 3.5×10 −10 mol L −1 (S/N=3). The practical application was demonstrated by determining BPA leaching from commercial plastic drinking bottles.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2014
·
IF 2.235
Jun Xiong,Wenshuai Zhu,Wenjing Ding,Lei Yang,Yanhong Chao,Hongping Li,Fengxia Zhu,Huaming Li
A heterogeneous catalyst system was synthesized by immobilizing phosphotungstic acid on ionic liquid-modified mesoporous silica SBA-15 and applied in oxidative desulfurization. Structure and properties of catalyst were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), X-ray photoelectron spectroscopy (XPS), N2 adsorption–desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and the contact angle. The results demonstrated that the synthesized catalyst possessed ordered mesopore structure and high special surface area. Due to the introduction of imidazole-based ionic liquid, the catalyst exhibited good wettability for model oil, which had significant contribution to desulfurization activity. Both DBT and 4,6-DMDBT could be removed completely at mild conditions (60 °C, 40 min). The removal of BT also can reach 81.3% within 60 min. Furthermore, the catalyst was recovered and reused in four reaction runs with a slight decrease in activity.
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RSC Advances
·
2015
·Vol. 5
·期 71
·57640-57646
·
IF 3.84
Baohua Zhang,Xiuqin Zhan,Pengyu Zhao,Zhonghao Li
Ionic liquids provide chemists with a versatile platform and many opportunities for constructing various interesting inorganic materials. Here, an ionic liquid-mediated synthesis route is proposed for the controlled synthesis of PtPd bimetallic particles. The synthesized PtPd particles have unique three dimensional nanostructures (3D) constructed by nanoparticle subunits. For the 3D nanostructures, the primary PtPd particles form aggregates with the characteristic of interparticle porosity. Among others, the Pt1Pd1 bimetallic particles exhibit superior electrocatalytic activity toward oxidation of methanol in an alkaline medium than the commercial state-of-the-art Johnson-Matthey platinum black catalyst (Hispec™ 1000). Furthermore, the catalytic activity towards p-nitrophenol reduction indicates that the synthesized Pt1Pd3 particles exhibit the highest catalytic activity in comparison with the studied various PtPd bimetallic particles, the monometallic Pt and the monometallic Pd particles. This study may pave the way for the efficient synthesis of three dimensional bimetallic nanostructures for improved catalytic applications.
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RSC Advances
·
2015
·Vol. 5
·期 54
·43528-43536
·
IF 3.84
Suhang Xun,Wenshuai Zhu,Dan Zheng,Hongping Li,Wei Jiang,Ming Zhang,Yuejiao Qin,Zhen Zhao,Huaming Li
High activity oxidation of sulfur compounds to sulfones in extraction coupled with catalytic oxidative desulfurization (ECODS) system catalyzed by supported ionic liquid [Bmim]FeCl4/Am TiO2 was reported. The catalysts were analyzed by thermogravimetric (TG) analysis, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). It was found that [Bmim]FeCl4 and Am TiO2 had a synergistic effect on the desulfurization system. Effects of calcination temperature of the catalyst and various reaction conditions on the catalytic activity of desulfurization were investigated. Moreover, GC-MS analyses were employed to prove the process of the desulfurization. As a solid catalyst, the supported ionic liquid could be separated from the reaction easily. The recycling tests showed that the desulfurization efficiency remained 100% after reusing it for 25 times. Therefore, the ECODS system has excellent reusability and is promising for industrial applications for catalytic oxidative desulfurization.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2015
·
IF 2.752
Aili Wang,Li Chen,Fan Xu,Zongcheng Yan
Epoxidized soybean oil (ESBO)-based ionic liquid microemulsions are promising alternatives for petroleum-based lubricants. This study presents the phase behavior of these microemulsions through phase manifestation, and the areas of the single-phase domain were accordingly calculated to illustrate the phase-forming capacities of the designed microemulsions. Effects of ionic liquid anions and cations, surfactant and co-surfactant chain lengths on the phase behavior, and phase-forming capacities of ESBO-based ionic liquid microemulsions were investigated. Results showed that the phase-forming capacities of the ESBO-based ionic liquid microemulsions with different ionic liquid anions and cations showed the following sequence: Tf 2 N − -based > PF 6 − -based > BF 4 − -based, OMIM + -based > HMIM + -based > BMIM + -based > EMIM + -based. Given the presence of ionic liquid–ESBO amphiphilic balance in the designed systems, the ESBO–surfactant micelles achieved maximum solubilization capacity for 1-butyl-3-methyl-imidazolium tetrafluoroborate when the surfactant had approximately eight ethoxylated groups. In addition, ESBO-based microemulsion containing n -hexanol showed a higher phase-forming capacity than that containing n -butanol, and n -octanol caused a different phase behavior for the ESBO-based microemulsion because of its oilier nature than a co-surfactant.
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ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Zilan Feng,Daize Mo,Zhipeng Wang,Shijie Zhen,Jingkun Xu,Baoyang Lu,Shouli Ming,Kaiwen Lin,Jinhua Xiong
ABSTRACT In this study, the electropolymerization of a novel methyl substituted unsymmetrical nitrogen analog of 3,4-ethylenedioxythiophene (EDOT), N-methyl-3,4-dihydrothieno[3,4-b][1,4]oxazine (MDTO) in air and moisture stable ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate (BmimPF 6 ) was reported. Electrochemical study demonstrated that MDTO exhibited a significantly lowered oxidation potential (0.51 V) and the resultant PMDTO films possessed favorable electroactivity and excellent electrochemical stability and could be further doped by cyclic voltammetry to substantially improve its doping level. The polymers also provided an optical band gap of about 1.6 eV, switching from slight blue in the oxidized form to dark blue in the reduced form with good optical contrast (24.0%), moderate response time (6.8 s) and excellent switching stability and color persistence ability.
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危险品化学品经营许可证（带存储）