JOURNAL OF POWER SOURCES
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2014
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IF 5.211
Borong Wu,Yonghuan Ren,Daobin Mu,Xiaojiang Liu,Feng Wu
LiNi 0.5 Mn 1.5 O 4 electrode modification is achieved in this work through adding inorganic lithium carbonate (Li 2 CO 3 ) into carbonate electrolyte. Superior cyclic stability of the cathode in the range of 5–2 V is attained, a capacity of 0.3698 mAh g −1 is lost per cycle, which is half of the value in the Li 2 CO 3 -free condition. The capacity loss above and below 3.5 V are both alleviated in the presence of Li 2 CO 3 . Its effect on both the electrolyte bulk and the cathode surface is analyzed with SEM , TEM and XPS measurements. The density functional theory (DFT) calculation is carried out to discuss the modification mechanism. It is speculated that Ni 4+ ⋯CO 3 2− coordination may be formed through the interaction between Ni and O, weakening the oxidizability of Ni 4+ on the electrode surface . In addition, Li 2 CO 3 can consume PF 5 in the electrolyte. The interphase film can also maintain thin and steady during the cycling within 5–2 V.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2015
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IF 2.587
Jinxia Zhou,Tingyu Huang,Yuling Zhao,Zhi Xia,Zhanwei Xu,Songyan Jia,Jianji Wang,Z. Conrad Zhang
Ionic liquids have been widely studied as effective reaction media for the conversion of glucose or cellulose to 5-hydroxymethhylfurfural (5-HMF). However, the recovery of 5-HMF from ionic liquids, typically carried out by extraction, has been encountered with very low extraction efficiency, which limited the reusability of the solvents. Through this work, based on the model biphasic system that consists of 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) as the ionic liquid phase and methyl isobutyl ketone (MIBK) as the extractant phase, the dominant force that suppresses the extraction efficiency of 5-HMF was identified as being the strong hydrogen bonding between 5-HMF and [BMIM]Cl. Solvent mediation with functional promoters have been established as a new strategy to shift this force, resulting in improved extraction efficiency of 5-HMF from the ionic liquid. For example, with ethanol as a promoter, the distribution coefficient of 5-HMF was about 10 times higher than that without a promoter.
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INDUSTRIAL CROPS AND PRODUCTS
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2013
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IF 2.468
Zhao Hu,Bing Liu,Zehui Zhang,Lianqing Chen
An efficient process was developed for the conversion of carbohydrates into 5-hydroxymethylfurfural (HMF) using DMSO as the solvent and an acidic ionic liquid 1-carboxypropyl-3-methyl imidazolium chloride ([CMIm]Cl) as the catalyst. The effects of various reaction parameters on HMF yields were investigated. HMF yields of 95.7% and 88.4% were obtained from fructose and inulin when reactions were carried out 120 °C after 120 min and 180 min, respectively. The combination of ZrOCl 2 and [CMIm]Cl resulted in a 50.6% yield of HMF from glucose. HMF could also be synthesized using other carbohydrates with moderate to high yields.
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Chemistry Central Journal
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2013
·Vol. 7
·期 1
·1-5
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IF 1.312
Liu Run-Qiang,Bai Lian-yang,Zhang Yi-Jun,Zhang Yu-Ping
Background At present, the study on the homogeneous-phase derivatization of cellulose in ionic liquid is mainly focused on its acetylation. To the best of our knowledge, there has been no such report on the preparation of cellulose-tris(3,5-dimethylphenylcarbamate) (CDMPC) with ionic liquid 1-allyl-3-methyl-imidazolium chloride (AmimCl) so far.Results With ionic liquid 1-allyl-3-methylimidazolium chloride (AmimCl) as a reaction solvent, cellulose-tris(3,5-dimethylphenylcarbamate) (CDMPC) was synthesized by the reaction of 3,5-dimethylphenyl isocyanate and soluble microcrystalline cellulose in a homogeneous phase. The synthesized CDMPC was then coated onto the surfaces of aminopropyl silica gel to prepare a chiral stationary phase (CSP). The prepared CSP was successfully used in chiral separation of seven racemic pesticides by high performance liquid chromatography (HPLC). Good chiral separation was obtained using n-hexane and different modifiers as the mobile phases under the optimal percentage and column temperature, with the resolution of metalaxyl, diniconazole, flutriafol, paclobutrazol, hexaconazole, myclobutanil and hexythiazox of 1.73, 1.56, 1.26, 1.00, 1.18, 1.14 and 1.51, respectively. The experimental results suggested it was a good choice using a green solvent of AmimCl for cellulose functionalization.Conclusion CDMPC was successfully synthesized as the chiral selector by reacting 3, 5-dimethylphenyl isocyanate with dissolved microcrystalline cellulose in a green ionic liquid of AmimCl.
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PubMed
高影响因子
PHOTOCHEMISTRY AND PHOTOBIOLOGY
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2014
·Vol. 90
·期 5
·1144-1149
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IF 2.684
Zhi Li,Li-Li Pan,Fei-Long Zhang,Xia-Li Zhu,Yang Liu,Zhen-Zhong Zhang
This report explores some properties of 80–200 nm nanoparticles containing 5-aminolevulinic acid (ALA) and fullerene (C60) for photodynamic therapy (PDT). Compared with ALA, the nanoparticles yielded more protoporphyrin IX (PpIX) formation in cells and tissues and to a significant improvement in antitumor efficacy in tumor-bearing mice. Maximum levels of PpIX were obtained 4 h after administration and selective PpIX formation in tumor was observed. These nanoparticles appear to be a useful vehicle for drug delivery purposes. In this study, a procedure for preparing fullerene nanoparticles containing ALA was developed. The product alone exhibited no detectable toxicity in the dark and was superior to ALA alone in promoting PpIX biosynthesis and PDT efficacy both in culture and in a murine tumor model. These results suggest that this procedure could be the basis for an improved PDT protocol for cancer control.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2016
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IF 4.179
Fan Wang,Ziliang Yuan,Bing Liu,Shaohua Chen,Zehui Zhang
In this study, a new ruthenium catalyst was used for the oxidation of biomass derived 5-hydroxymethylfurfural (HMF) under mild conditions, which was prepared by the exchange of Ru 3+ with H + in the structure of the zirconium phosphate (ZrP). The as-prepared ZrP–Ru catalyst showed high catalytic activity towards the oxidation of HMF, affording 100% of HMF conversion at 130 °C after 12 h under atmospheric oxygen pressure. 2,5-Furandicarboxylic acid (FDCA) and 2,5-diformylfuran (DFF) were detected to be the major oxidation products.
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MOLECULAR CRYSTALS AND LIQUID CRYSTALS
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2016
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IF 0.532
J. Wei,K. Liu,F. Lin,Y. Zhou,J. Zou,C. Lin
Through the sulfonation of protocatechuic acid, sodium 5-carboxy-2,3-dihydroxybenzenesulfonate (SPA) was synthesized. The structure of the sulfonated derivative was confirmed by FT-IR, MS, 1H NMR, 13C NMR, single crystal X-ray diffraction, and thermogravimetric analysis. The antioxidative activities of the derivative SPA were evaluated using 1,1-diphenyl-2-picrylhydrazyl (DPPH) scavenging method and reducing power determination, showing that SPA had strong antioxidative effects. Meanwhile DPPH scavenging progress by SPA was analyzed from dynamics experiments. Isothermal titration calorimetry (ITC) and circular dichroism (CD) were applied to investigate the interaction between the derivative SPA and human serum albumin (HSA).
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Polymer Chemistry
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2016
·Vol. 7
·期 19
·3268-3276
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IF 5.687
Ye Chen,Leilei Rui,Lichao Liu,Weian Zhang
Supramolecular amphiphiles based on a pillar[5]arene with enhanced photodynamic therapy have been fabricated. Supramolecular amphiphiles based on host–guest complexation between a poly(ethylene glycol)-functionalized pillar[5]arene (PEG-P[5]A) and a pyridinium-terminated porphyrin derivative bearing a disulfide bond (TPPC6-SS-Py) could self-assemble into spherical micelles in aqueous solution with good colloidal stability as confirmed by transmission electron microscopy (TEM) and dynamic light scattering (DLS). Also, PEG-P[5]A/TPPC6-SS-Py micelles exhibited rapid release of porphyrin photosensitizers in a reducing environment. In addition, these micelles demonstrated nearly no toxicity in the dark but a higher photocytotoxicity upon light irradiation evaluated by the MTT assay. Flow cytometry and confocal laser scanning microscopy (CLSM) revealed a more effective cellular uptake property compared with free porphyrin. Therefore, novel reduction-responsive supramolecular amphiphiles with rapid drug release and superior cell internalization ability are constructed, which may provide a platform for drug delivery systems.
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ANALYTICAL BIOCHEMISTRY
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2017
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IF 2.334
Lu Chen,Hui-Ting Lian,Xiang-Ying Sun,Bin Liu
A novel electrochemical sensor was presented for the determination of L-5-hydroxytryptophan (L-5-HTP) based on a graphene-chitosan molecularly imprinted film modified on the surface of glassy carbon electrode (GR-MIP/GCE). The morphology and composition of the imprinted film were observed in field emission scanning electron microscopy (FESEM), raman spectroscopy and fourier transform infrared (FTIR). The properties of the sensor were evaluated by electrochemical techniques. Under the optimal conditions, the peak currents of L-5-HIP were found to be linear in the concentration range of 0.05–7.0 μM, while the sensor also exhibited great features such as low detection limit of 6.0 nM (S/N = 3), superb selectivity against the structural analogues, good antidisturbance ability among coexisting components, excellent repeatability and stability. Moreover, the proposed method had been applied to the detection of L-5-HTP in human blood serum with a satisfactory recoveries ranging from 90.6% to 105.6%.
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ACS Sustainable Chemistry & Engineering
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2017
·
IF 5.951
Huili Zhang,Qi Wu,Cong Guo,Ying Wu,Tinghua Wu
The photocatalytic selective oxidation of biomass derivate compound 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran is an environmentally friendly and energy-saving process. Nb2O5 was prepared and applied in the oxidation of HMF under visible light, although its bandgap energy is higher than 3.2 eV. The reaction process follows a special mechanism over a Nb2O5 catalyst different from the normal oxide semiconductor. The effect of calcination temperature, incident wavelength, and reaction time on photocatalytic performance was investigated. Nb2O5-800 exhibits the best performance in the presence of O2 with benzotrifluoride as a solvent under visible light irradiation.
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JOURNAL OF MOLECULAR LIQUIDS
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2017
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IF 3.648
Jiang Xiao,Yongzhong Jia,Chenglong Shi,Xingquan Wang,Su Wang,Ying Yao,Yan Jing
A green and efficient liquid–liquid extraction system was developed for the separation of lithium isotopes by using hydrophobic ionic liquids (ILs = [C 4,6,8,10 mim] + [NTf 2 ] − ) as extraction organic phase and benzo-15-crown-5 (B15C5) as complexing agent. The maximum single-stage separation factor α of 6 Li/ 7 Li obtained in this study was 1.029 ± 0.001, indicating 6 Li was enriched in ionic liquid phase while 7 Li was concentrated in the aqueous phase. The lithium ion was extracted into the ionic liquid in the formation of 1:2 complex [Li + (B15C5) 2 ]. The negative data of thermodynamic parameters (∆ H 0 and ∆ G 0 ) suggest that the extraction system was a spontaneous exothermic process . In addition, effective lithium isotopes separation factor and the extraction efficiency of lithium ions can be gained in the condition of lower temperature with softer counter anions in the novel extraction system.
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Journal of Cleaner Production
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2016
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IF 4.959
Guangqiang Lv,Liangliang Deng,Boqiong Lu,Jinlong Li,Xianglin Hou,Yongxing Yang
The dehydration of fructose in aqueous and biphasic system was studied using heteropolyacids, immobilized in silica , as catalyst. The catalysts were characterized by ICP-AES, nitrogen sorption , NH 3 -TPD, TEM , FT-IR, XRD , and TGA. The effect of different parameters, such as reaction temperature, reaction time, catalyst loading and volume ratio of water with methyl isobutyl ketone (MIBK) was studied. Silica included tungstosilisic acid (HSiW) was found to function as an efficient catalyst for the transformation of fructose into 5-hydroxymethylfurfural in aqueous phase . Addition of MIBK into the reaction system can increase both of fructose conversion and HMF selectivity . Besides, MIBK showed a positive effect in increasing the stability of the catalyst by suppressing the formation and deposition of humins over catalyst surface . After the third catalysis cycles, a stabilization of the catalytic activity was observed.
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危险品化学品经营许可证（带存储）