ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2019
·Vol. 411
·期 22
·5855-5866
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IF 3.286
Ma Xiaofei,Du Yingxiang,Zhu Xinqi,Feng Zijie,Chen Cheng,Yang Jiangxia
Recently, increasing attention has been given to the research on chiral ionic liquids (CILs) in chiral separation field; however, only a few literatures focus on the exploration of CILs as the sole chiral selector. In this study, an ionic liquid chiral selector based on antibiotic, namely tetramethylammonium clindamycin phosphate (TMA-CP), was originally synthesized and subsequently utilized for enantioseparation in capillary electrophoresis (CE). Remarkably improved separations of eight racemic analytes were achieved in TMA-CP system in contrast to the clindamycin phosphate (CP) system. The optimal separation conditions were determinated by systematic experiments on several crucial parameters including the type and proportion of organic modifier, CIL concentration, buffer pH, and applied voltage. Additionally, molecular modeling with AutoDock was applied to probe into the chiral recognition mechanism of the ionic liquid chiral selectors, which well corresponded with the experimental results. It is the first time that antibiotic-based ionic liquid was exploited as favorable sole chiral selector in CE, and this strategy has paved a new way for development of novel ionic liquids chiral selectors based on antibiotics.
Graphical abstract
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2019
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IF 2.813
Shiqian Gao,Yiqiu Wu,Siyuan Xie,Zichun Shao,Xiumin Bao,Yumeng Yan,Youyi Wu,Junxia Wang,Zhanen Zhang
The ionic liquid (IL) was introduced to the synthesis system of magnetic zeolite imidazolate framework-8 (M/ZIF-8), which was benefit to the formation of binary imidazole and the co-modification of M/ZIF-8. The morphology and textural properties of ILM/ZIF-8 were characterized by SEM, TEM , BET and BJH. The crystal structural shape and size of MZIF-8 was unvaried with the interventional of IL. The ILM/ZIF-8 was applied to the concentration and determination of aflaoxins (AFB 1 , AFB 2 , AFG 1 and AFG 2 ) in milk samples based on magnetic solid phase extraction (MSPE) coupled with ultra high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS). The experimental parameters of the MSPE, including amount of ILM/ZIF-8, pH, type and amount of desorption solvent, extraction time and sample volume were investigated by a univariate method and orthogonal screening. The four AFs were concentrated from the 20 mL milk when 90 mg ILM/ZIF-8 was used as magnetic adsorbent. The extraction efficiency of AFs was higher than 80.0% within 15 min. The limits of quantitative and detection were 7.5–26.7 and 2.3–8.1 ng/L, respectively. The proposed method was applied to the determination of milk samples containing trace amounts of AFs and the recoveries ranged from 79.0% to 102.5%, with RSD below 7.7%.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2018
·
IF 4.61
Chen Fan,You Liang,Hongqiang Dong,Jiale Yang,Gang Tang,Wenbing Zhang,Dandan Kong,Jianqiang Li,Yongsong Cao
The massive release of rhodamine B (RhB) to water system is an emerging problem, which dramatically threaten environment and human health. The development of an adsorbent with enhanced removal efficiency for RhB is urgently needed. Herein, we report an environment-friendly synthesis of high quality zeolitic imidazolate framework-8 (ZIF-8) and functional ionic liquid@ZIF-8 in water-based system without heat treatment for improving its adsorption property. Guanidinium ionic liquids (ILs) could not only act as greener agents instead of volatile bases and toxic surfactants to efficiently control the nucleation and growth rate of ZIF-8, but also were incorporated as shell material to add specific adsorption sites. The relationship between nanoparticle structure and adsorption performance for RhB was systematically investigated. Due to high surface area (1167 m 2 g −1 ), high porosity (0.79 cm 3 g −1 ), high crystallinity , nano size (about 100 nm) and monodispersity, the as-obtained ZIF-8 showed improved adsorption capacity toward RhB (80% removal efficiency). Heteropolyanion-based guanidinium IL@meso-ZIF-8 (HPAIL@meso-ZIF-8) exhibited the high RhB uptake capacity of 278 mg g −1 (higher than most of the reported adsorbents) and effectively removed 99% of RhB within 15 min. The results showed that the adsorption process of prepared materials fitted well with pseudo-second-order kinetics and Langmuir isotherm model. The existence of mesopores in ZIF-8 facilitated the diffusion of RhB and the incorporated guanidinium IL played a significant role in enhancing the adsorption affinity. Moreover, the reusability results revealed the HPAIL@meso-ZIF-8 as a highly efficient adsorbent for RhB removal with satisfactory performance and structural stability. Therefore, HPAIL@meso-ZIF-8 is one of the most promising adsorbents for organic dye removal from water.
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Datong Wu,Jiapei Yang,Yonggang Peng,Yin Yu,Jie Zhang,Lili Guo,Yong Kong,Jinlong Jiang
It is desirable to develop an approach for highly enantioselective recognition by using electrochemical analysis. Here, a novel chiral poly(ionic liquid)-metal complex ( S , S )-PCIL-5-Cu(II), derived from (1 S ,2 S )-1,2-diphenyl-1,2-ethanediamine, is synthesized through the multi-step route. Combined with the polymer bearing the electroactive unit, an electrochemical chiral sensor is constructed by using ( S , S )-PCIL-5-Cu(II) as modification on the electrode surface for the first time. It is observed that the electrochemical sensor is successfully applied to chiral recognition of various acids by comparing signals including the peak current ( I P ) and the oxidation peak potential ( E P ). Specifically, L or ( S ) forms exhibit higher I P compared to D or ( R ) forms. For example, the peak current ratio ( I L / I D ) for malic acid is 24.8. Meanwhile, E P of D -malic acid is located negatively versus L -malic acid with the separation difference of 88 mV. Additionally, a good linear relationship between the ee value and I P is achieved. In brief, our results highlight the feasibility of the proposed approach for electrochemical chiral recognition and ee determination, which can further advance the feasibility of the functional poly(ionic liquid).
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Petroleum Science
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2018
·Vol. 15
·期 4
·870-881
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IF 1.624
Yu Zhendong,Wang Donghui,Xun Suhang,He Minqiang,Ma Ruliang,Jiang Wei,Li Hongping,Zhu Wenshuai,Li Huaming
Supported ionic liquid (IL) catalysts [C n mim] 3 PMo 12 O 40 /Am TiO 2 (amorphous TiO 2 ) were synthesized through a one-step method for extraction coupled catalytic oxidative desulfurization (ECODS) system. Characterizations such as FTIR, DRS, wide-angle XRD, N 2 adsorption–desorption and XPS were applied to analyze the morphology and Keggin structure of the catalysts. In ECODS with hydrogen peroxide as the oxidant, it was found that ILs with longer alkyl chains in the cationic moiety had a better effect on the removal of dibenzothiophene. The desulfurization could reach 100% under optimal conditions, and GC–MS analysis was employed to detect the oxidized product after the reaction. Factors affecting the desulfurization efficiencies were discussed, and a possible mechanism was proposed. In addition, cyclic experiments were also conducted to investigate the recyclability of the supported catalyst. The catalytic activity of [C 16 mim] 3 PMo 12 O 40 /Am TiO 2 only dropped from 100% to 92.9% after ten cycles, demonstrating the good recycling performance of the catalyst and its potential industrial application.
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JOURNAL OF MOLECULAR LIQUIDS
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2018
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IF 4.513
Wei Jiang,Lei Dong,Huan Li,Hao Jia,Linhua Zhu,Wenshuai Zhu,Huaming Li
Magnetic core-shell structure microspheres with tunable pore volumes were synthesized and used to immobilize a polyoxometalate-based ionic liquid for oxidative desulfurization of diesel fuel. The as-prepared catalysts were characterized by transmission electron microscopy , Fourier transform infrared spectroscopy , Raman spectroscopy , and nitrogen adsorption–desorption. The results showed that the small catalyst had a large pore volume and the large catalyst had a small pore volume, while their BET surface areas and pore sizes were almost the same. Compared with the large catalyst, the small catalyst showed better catalytic activity, probably due to the promotion of its large pore volume. Under the optimal reaction conditions, the removal of 4,6-dimethyldibenzothiophene could reach 95.4% with a residual sulfur content of 9.2 mg kg −1 . After the reaction, the catalyst could be separated by a magnetic field and recycled at least 7 times with little decrease in desulfurization efficiency.
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International Journal of Chemical Reactor Engineering
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2018
·Vol. 17
·期 3
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IF 0.881
Benyong Han,Fang Yin,Shiqing Liu,Xingling Zhao,Jing Liu,Changmei Wang,Hong Yang,Wudi Zhang
Methyl laurate was synthesized from lauric acid and methanol using Brønsted acid ionic liquids as catalysts, by an esterification reaction. The efficiencies of four different catalysts, 1-methylimidazolium hydrogen sulfate ([Hmim]HSO 4 ), 2-pyrrolidonium hydrogen sulfate ([Hnhp]HSO 4 ), 1-(3-sulfonic acid) propyl-2-pyrrolidonium hydrogen sulfate ([C 3 SO 3 Hnhp]HSO 4 ) and H 2 SO 4 were compared. The effect of the methanol/lauric acid molar ratio, reaction temperature, reaction time, and catalyst dosage on the lauric acid conversion was investigated by single-factor experiments. On the basis of single-factor experiments, the esterification of lauric acid and methanol was optimized using response surface methodology (RSM) based on central composite design (CCD). The results showed that the most effective catalyst was the ionic liquid [C 3 SO 3 Hnhp]HSO 4 . The optimal conditions were as follows: [C 3 SO 3 Hnhp]HSO 4 dosage of 10 % (based on the mass of lauric acid), methanol/lauric acid molar ratio of 9:1, reaction time of 1 h and reaction temperature of 70 °C. Under these conditions, the lauric acid conversion reached 95.33 %. The catalytic activity of [C 3 SO 3 Hnhp]HSO 4 still remained high after 5 cycles.
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Materials Science & Engineering C-Materials for Biological Applications
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2018
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IF 5.08
Hongbo Suo,Zhen Gao,Lili Xu,Chao Xu,Dinghua Yu,Xinran Xiang,He Huang,Yi Hu
We developed magnetic chitosan nanoparticles (CS‑Fe 3 O 4 ) with mean diameter of 15–20 nm. Subsequently, these inorganic-organic composite nanoparticles were modified using an imidazole-based functional ionic liquid (IL). The prepared support (IL‑CS‑Fe 3 O 4 ), which was used to immobilize porcine pancreatic lipase (PPL), was characterized using Fourier transform infrared (FTIR) spectroscopy, vibrating sample magnetometry (VSM), thermogravimetry (TG), transmission electron microscopy (TEM) and X-ray diffraction (XRD). Circular dichroism (CD) was used to analyze the secondary structure of immobilized PPL. The immobilized PPL (PPL‑IL‑CS‑Fe 3 O 4 ) exhibited 1.93-fold higher specific activity than PPL‑CS-Fe 3 O 4 when triacetin was used as the substrate, and showed 95 mg/g of lipase immobilization capacity and 382% of activity recovery. The residual activity of PPL‑IL‑CS‑Fe 3 O 4 was above 60% of the initial activity after incubation at 50 °C for 6 h, as was higher than that of PPL‑CS‑Fe 3 O 4 which showed 40% of the initial activity. In addition, PPL‑IL‑CS‑Fe 3 O 4 retained 84.6% of the initial activity after 10 cycles, whereas PPL‑CS‑Fe 3 O 4 retained only 75.5% activity. Furthermore, the kinetic parameters, apparent K m and V max of PPL‑IL‑CS‑Fe 3 O 4 were 2.51 mg/mL and 1.395 U/mg respectively, these results indicated that the immobilized PPL had better affinity towards the substrate, especially when the nanoparticles were modified by functional IL. Besides, the magnetic chitosan nanoparticles loaded with PPL were easily recovered. A novel, efficient, and practical method for enzyme immobilization was developed.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2018
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IF 3.235
Wenna Zhang,Wenwen Zhang,Shuai Chen,Bin Guo,Hua Gu,Yu Xue,Zexu Xue,Jingkun Xu
In recent years, polyselenophene and its derivatives have been paid more attention due to their unique properties such as lower band gaps and redox potentials . However, the poor solubility and molecular rigidity of polyselenophene and its derivatives limit them to use in flexible optoelectronic devices. Therefore, in order to enrich the structures and properties, fully understand the structure-property relationship and further improve the electrochromic performances of polyselenophene and its derivatives, we synthesized its propyl-analogues as precursors, to electrosynthesize three conducting polymers , poly(3,4‑propylenedioxyselenophene) (PProDOS) and its alkyl-modified derivatives, poly(3,3′‑dimethyl‑3,4‑dihydro‑2H‑selenopheno[3,4‑b][1,4]dioxepine) (PProDOS-C 1 ) and poly(3,3′‑dibutyl‑3,4‑dihydro‑2H‑selenopheno[3,4‑b][1,4]dioxepine) (PProDOS-C 4 ). The electrochemical and spectroelectrochemical behaviors of PProDOS and PProDOS-C n (n = 1, 4) were investigated in detail in an ionic liquid , 1‑butyl‑3‑methylimidazolium hexafluorophosphate (BmimPF 6 ). Results showed that PProDOS-C 1 and PProDOS-C 4 exhibited superior electrochromic performances such as high optical contrast (62%) and excellent coloration efficiency (573 cm 2 C −1 ). In addition, as the alkyl chains increased, the onset oxidation potentials of monomers and the optical band gaps of polymer films decreased and the electrochemical activity of polymers increase. These polymers supply varied electrochromic colors and have prospect in display application.
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ACS Applied Energy Materials
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2018
·
IF 0
Xiang-Qian Zhang,An-Hui Lu,Qiang Sun,Xiao-Fei Yu,Jun-Yue Chen,Wen-Cui Li
Ordered carbon spheres with enlarged mesopores have been considered to be desirable carbon electrodes for ionic liquid-based supercapacitors. New synthesis of these materials to use commercially available soft templates is yet to be developed. In this study, we demonstrate that by silica encapsulation of self-assembled polymer nanospheres prepared using commercially available Pluronic F127, mesopore sizes of obtained carbon nanospheres can be enlarged from micropores to large mesopores up to 10.7 nm in size. A linear relationship between the mesopore size and the thicknesses of silica nanocages has been established, which enables us to alter the mesopore sizes in a controlled manner. The two-electrode test in EMI-BF4 electrolyte demonstrates that mesoporous carbon nanospheres show a capacitance of up to 113 F g–1 at 10 A g–1. They also exhibit an excellent energy density (E) of 56 W h kg–1 (working voltage of 4.0 V). Such high capacitance, outstanding rate capability, and excellent power density (P) are owing to enlarged mesoporous channels and large specific surface area allowing rapid mass transportation and full use of the surface area.
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CARBOHYDRATE POLYMERS
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2015
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IF 4.074
Weiqing Kong,Qingqing Dai,Junli Ren,Nianfang Ma
A new xylan ester (xylan 3,5-dinitrobenzoate) as a creatinine adsorbent was prepared by the homogeneous acylation of xylan with 3,5-dinitrobenzoyl chloride in 1-butul-3-methylimidazolium chloride ionic liquid. The influences of reaction conditions on the degree of substitution values of xylan esters were discussed. Results indicated that xylan esters with the degree of substitution range from 1.34 to 1.77 were obtained under the given conditions. The FTIR and 13 C NMR spectroscopies provided the evidence of grafting 3,5-dinitrobenzoyl groups onto the backbone of xylan. Moreover, the adsorption properties of the xylan ester for creatinine were also investigated. Isotherm studies showed that the sorption capacities for creatinine were 2.45, 2.08 and 1.86 mg/g for 23, 30 and 37 °C, respectively. Thermodynamic studies performed indicated the sorption process mainly was controlled by the chemical adsorption. Therefore, xylan 3,5-dinitrobenzoate displayed the promising application in the treatment of chronic renal failure by the creatinine adsorption as the new oral adsorbent.
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FLUID PHASE EQUILIBRIA
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2013
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IF 2.379
Xiuhong Wang,Xilian Wei,Jie Liu,Jifeng Liu,Dezhi Sun,Panpan Du,Ali Ping
The phase behavior and microstructures of the aqueous two-phase systems (ATPS) composed of a cationic/an anionic surfactant (3- p -nonylphenoxy-2-hydroxypropyltrimethylammonium bromide, NPTAB/sodium dodecylbenzenesulfonate, SDBS) and an ionic liquid (1-hexyl-3-methylimidazolium tetrafluoroborate, [Hmim][BF 4 ]) were studied by using cryogenic transmission electron microscopy (Cryo-TEM) observations, nuclear magnetic resonance (NMR) experiments and electric conductivity. The concentration effects of the surfactants and the ionic liquid on the phase separation were systematically investigated. The experimental outcomes indicated that the formation of ATPS can be attributed to the coexistence of different micelles in the upper and lower phases. The ATPS here investigated were further characterized for the first time through their application to the extractive potential for amino acids , where l -tryptophan was selected as a model biomolecule.
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危险品化学品经营许可证（带存储）