RESEARCH ON CHEMICAL INTERMEDIATES
·
2015
·Vol. 42
·期 3
·2035-2045
·
IF 1.221
Yu Zhi-Yu,Fang Qiu-Sheng,Zhou Jia,Song Zhi-Bin
A simple, efficient, and eco-friendly aerobic procedure for synthesis of 2-substituted benzothiazoles catalyzed by facile prepared [N 2222 ][Pro] in a biomass medium (ethyl lactate) has been developed. The reactions afford the target 2-arylbenzothiazoles in good to excellent yields (>80 %) under air condition and was observed without use of chromatography. In addition, this proline-based ionic liquid catalyst can be easily recycled six times without loss of catalytic activity in gram scale synthesis.
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CHEMOSPHERE
·
2015
·
IF 3.34
Yunfei Zhang,Bo Yang,Yanni Han,Chaojin Jiang,Deli Wu,Jinhong Fan,Luming Ma
In this work, we tested a novel iron metal matrix composite (MMC) synthesized by mechanically introducing quartz sand (SiO 2 ) into an iron matrix (denoted as SiO 2 –Fe MMC). The pseudo-first-order reaction rate constant of the SiO 2 –Fe MMC (initial pH 5.0) for 20 mg/L of 2-chlorophenol (2-CP) was 0.051 × 10 −3 L/m 2 /min, which was even higher than that of some reported Pd/Fe bimetals. This extraordinary high activity was promoted by the quick iron dissolution rate, which was caused by the formation of Fe–C internal electrolysis from carbonization of process control agent (PCA) and the active reinforcement/metal interfaces during the milling process. In addition, pH has slight effect on the dechlorination rate. The SiO 2 –Fe MMC retained relatively stable activity, still achieving 71% removal efficiency for 2-CP after six consecutive cycles. The decrease in dechlorination efficiency can be attributed to the rapid consumption of Fe 0 . A dechlorination mechanism using the SiO 2 –Fe MMC was proposed by a direct electron transfer from Fe 0 to 2-CP at the quartz sand/iron interface.
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APPLIED CATALYSIS A-GENERAL
·
2014
·
IF 3.674
Xiuquan Jia,Jiping Ma,Min Wang,Zhongtian Du,Fang Lu,Feng Wang,Jie Xu
The promoted effect of Cu(NO 3 ) 2 on aerobic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran (DFF) catalyzed by VOSO 4 in acetonitrile was intensively investigated. It was revealed that Cu(NO 3 ) 2 facilitated the activation of VOSO 4 to generate active V 5+ species via the generation of NO x gas. The high DFF selectivity is ascribed to Cu 2+ cation which can effectively prohibit oxidative C C bond cleavage reaction of HMF and prevent radical reaction of DFF to humins. In addition, the polarity of solvent plays a great role on high selectivity of DFF.
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Inorganic and Nano-Metal Chemistry
·
2017
·
IF 0
Hui-Long Zhu,Yu-Wei Liu,Zong-Ming Tang,Fu-Jun Yin,Wei-Wei Liu,Zhi-Ling Cao,Juan Bao,Meng Li,Ling-Yan Qin,Da-Hua Shi
Two new similar zinc(II) complexes, [ZnCl2L12] and [ZnCl2L22], derived from the 2-amino-1,3,4-thiadiazole derivatives, were prepared and structurally characterized by X-ray diffraction. The Zn atom in each complex has a tetrahedral coordination and is coordinated by two N atoms of the ligands and two Cl atoms. The urease inhibitory activities of the complexes and the ligands were evaluated.
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ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Zijiong Li,Weiyang Zhang,Chunyan Sun,Zhifu Feng,Baocheng Yang
It has shown better electrochemical performance to use two dimensions (2D) nanomaterial nickel hydroxide nanosheets as electrode materials in energy storage research. However, when compared with carbon electrode material, the disadvantage of metal hydroxide is more obvious. In this study, we use Ni(OH) 2 /rGO composites (NGCs) synthesized by hydrothermal method as electrode materials to conduct an electrochemical property tests in 6 M KOH electrolyte solution . As a result, when current density of NGC 8 samples (the mass ratio of Ni(OH) 2 and graphene is 8:1) is 0.8 A g −1 , the largest specific capacitance of composites is 1862.2 F g −1 . What’s more, when the current density is 15 A g −1 , the capacitance only reduced to 91.6% after the constant current charge and discharge for 2000 cycles, which showed magnificent cycling stability. Further investigations, the 2D nanomaterial NGCs can be easily transmitted to NrCs (NiO/rGO composites), and delivers a specific capacitance of 782.5 F g −1 at a current density of 0.5 A g −1 . These works are of great significance for the research of energy storage materials and the development of energy storage device.
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MACROMOLECULAR MATERIALS AND ENGINEERING
·
2017
·Vol. 302
·期 6
·1700069
·
IF 2.863
Jun-Jiao Yin,Fazli Wahid,Qian Zhang,Yong-Chun Tao,Cheng Zhong,Li-Qiang Chu
A simple strategy to fabricate bifunctional antibacterial coatings via in situ synthesis and incorporation of silver nanoparticles (AgNPs) into quaternized poly(2-(dimethylamino)ethyl methacrylate) (qPDMAEMA) brushes without using any reducing agents is reported. PDMAEMA brushes are prepared on Si wafer substrates via surface-initiated reverse atom transfer radical polymerization, which then are quaternized with ethyl bromide and hexyl bromide, respectively. The resulting qPDMAEMA-AgNP nanocomposite coatings are characterized by using Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscope (FE-SEM), and Raman spectroscopy. FE-SEM and Raman results indicate that the AgNPs with an average diameter of 35 nm are successfully loaded into the qPDMAEMA brushes. Furthermore, the antibacterial activities of the qPDMAEMA-AgNP nanocomposite coatings against Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli are investigated by both disc diffusion and colony-forming unit methods. The results show excellent antibacterial properties of the nanocomposite coatings. The influence of the length of the quaternization agents on their antibacterial properties is also investigated.
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CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Hong Zhang,Xiaoyu Yang,Zhaohui Liu,Yanzhao Yang
An arisen and environment-friendly method of cloud point extraction (CPE) which involved Octylphenoxypolyethoxyethanol (TX-114) as surfactant and 2-Mercaptobenzothiazole-functionalized ionic liquid as extractant was carried out to separate Ru(III) from aqueous phase to bottom surfactant phase for the first time. A host of variable ( e.g. , the extractant concentration, hydrochloric acid concentration, nitric acid concentration, TX-114 mass fraction, TX-114 volume and sodium chloride concentration) were evaluated and optimized to investigate the extraction behavior. At optimized experimental conditions, the extraction percentage of Ru(III) was found to be 82%, together with the enrichment factor of 40. A special complexation extraction mechanism of Ru(III) in CPE process was studied systemically and confirmed via job method, UV–vis spectrum and FT-IR spectrum in detail. Taking together, the rational-designed functional ionic liquid as a novel extractant exhibited superior extractability for Ru(III) in CPE system.
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ANALYTICAL CHEMISTRY
·
2017
·
IF 6.32
Hong Cheng,Shi-Ying Li,Hao-Ran Zheng,Chu-Xin Li,Bo-Ru Xie,Ke-Wei Chen,Bin Li,Xian-Zheng Zhang
A novel single-molecular fluorescent probe was developed for spatiotemporal matrix metalloproteinase-2 (MMP-2) and caspase-3 imaging with distinct fluorescence signals. Due to the multi-Förster resonance energy transfer (FRET) processes, the probe could respond to MMP-2 and caspase-3 independently with high signal-to-noise ratio. Moreover, the overexpression of MMP-2 in cancer cell lines and the cisplatin induced cell apoptosis were spatiotemporal imaged with distinct fluorescence emissions. Because of the independent process of the probe for MMP-2 and caspase-3 imaging, the probe could meet the demands for precise disease diagnosis and cancer theranostic applications, which could extensively simplify the processes for precise cancer diagnosis and imaging.
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MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Shuqiang Jiao,Jingjing Tuo,Hongliang Xie,Zihang Cai,Shuai Wang,Jun Zhu
Prussian blue analogues (PBAs) have recently attracted extensive interests as a new class of cathode materials for rechargeable batteries. Copper hexacyanoferrate, a typical Prussian blue analogue with the chemical formula Cu 3 [Fe(CN) 6 ] 2 , has been synthesized by solution precipitation method and investigated as a cathode material for sodium-ion batteries. The galvanostatic cycling tests show a specific capacity of 44 mA h g −1 at a current density of 20 mA g −1 , and the capacity retention can be 57.1% after 50 cycles. The material can also deliver a specific capacity of 37 mA h g −1 and 25 mA h g −1 at a rate of 50 mA g −1 and 100 mA g −1 , respectively. Furthermore, the material exhibits a high reduction peak at 3.32 V vs. Na + /Na, which brings more power to sodium-ion batteries. The data indicate the as-prepared material is capable of realizing the single electron redox capacity due to the reduction of Fe 3+ /Fe 2+ . All of the findings suggest a possible use of Cu 3 [Fe(CN) 6 ] 2 nanoparticles as environmental friendly and cost-effective cathode material, which also open new perspectives to develop cathode materials for sodium-ion batteries.
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INORGANIC CHEMISTRY
·
2017
·
IF 4.857
Pifu Gong,Siyang Luo,Ke Xiao,Qian Huang,Yi Yang,Hongwei Huang,Yicheng Wu,Chuangtian Chen,Zheshuai Lin
A new perovskite stoichiometric alkali tin dihalides compound, Cs3Sn3F2Cl7, is synthesized by a hydrothermal method. This compound belongs to the monoclinic space group of P21/c with cell parameters of a = 9.5645(4) Å, b = 14.2057(7) Å, c = 13.5828(6) Å, and β = 93.2450(10)°. Unlike the common perovskites in which octahedra are interconnected to be a three-dimensional network, Cs3Sn3F2Cl7 possesses a zero-dimensional structure consisting of Cs+ cations, isolated [SnCl3]− trigonal pyramids, and dimer structural units [Sn2F2Cl4]2–; the latter microscopic unit is found for the first time. The thermal stability and UV–vis–NIR diffuse reflectance spectroscopy in Cs3Sn3F2Cl7 are measured, and the electronic structure is calculated. Interestingly, the 5s2 lone-pair electrons on Sn2+ cations are stereochemically active, which results in a pretty good photocatalytic activity of the title compound.
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BIOMETALS
·
2017
·Vol. 30
·期 3
·441-447
·
IF 2.183
Wang Qingming,Sun Huifang,Sha Weilin,Chen Juan,Gu Liuyue,Wang Dong,Tang Xinhui
A novel S2O3 2− luminescent sensor (Cu2+-p-CPIP) was developed and the presence of S2O3 2− caused an obvious fluorescence enhancement at 420 nm upon excitation at 330 nm, which could be distinguished with the naked eye under a UV lamp. Remarkably, the compound exhibited excellent selective and sensitive response to S2O3 2− over other common anions with a micromolar limit of detection (0.442 μM) in DMSO/H2O (v/v, 1:1) buffer. The absorbance intensity and the color of Cu2+-p -CPIP solution changed gradually with the increase of S2O3 2− concentration. The proposed method was applied to the determination of S2O3 2− in milk samples and the recoveries were 97.5–105%. The preparation of Cu2+-p -CPIP exhibited the quick, simple and facile advantages. The results showed that Cu2+-p -CPIP can be a good candidate for simple, rapid and sensitive colorimetric detection of S2O3 2− in aqueous solution.
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RSC Advances
·
2016
·Vol. 6
·期 111
·110229-110234
·
IF 3.289
Yangyang Ma,Zhongtian Du,Fei Xia,Jiping Ma,Jin Gao,Jie Xu
Lignin is the primary source of aromatic chemicals in nature. Selective aerobic oxidation has provided a promising approach for breaking lignin into smaller aromatics. During VO(acac)2-catalyzed oxidation of lignin model compound 2-phenoxy-1-phenylethanol, benzaldehyde was unexpectedly observed as a product, in contrast to the results reported previously. The reaction pathway was studied, and a hemiacetal-like intermediate was found to be involved, and the similar intermediate was also observed during oxidation of model compound benzyl phenyl ether. Compared with direct C–O bond cleavage, prior formation of hemiacetal-like structures via oxidation would be expected to facilitate the cleavage of the aryl ether bond in aralkyl aryl ethers under mild reaction conditions.
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