Nano Research
·
2017
·Vol. 10
·期 8
·2699-2711
·
IF 7.354
Wang Ting,Chai Yuanyuan,Ma Dekun,Chen Wei,Zheng Weiwei,Huang Shaoming
Nanomaterial shapes can have profound effects on material properties, and therefore offer an efficient way to improve the performances of designed materials and devices. The rational fabrication of multidimensional architectures such as one dimensional (1D)–two dimensional (2D) hybrid nanomaterials can integrate the merits of individual components and provide enhanced functionality. However, it is still very challenging to fabricate 1D/2D architectures because of the different growth mechanisms of the nanostructures. Here, we present a new solvent-mediated, surface reaction-driven growth route for synthesis of CdS nanowire (NW)/CdIn 2 S 4 nanosheet (NS) 1D/2D architectures. The as-obtained CdS NW/CdIn 2 S 4 NS structures exhibit much higher visible-light-responsive photocatalytic activities for water splitting than the individual components. The CdS NW/CdIn 2 S 4 NS heterostructure was further fabricated into photoelectrodes, which achieved a considerable photocurrent density of 2.85 mA·cm −2 at 0 V vs. the reversible hydrogen electrode (RHE) without use of any co-catalysts. This represents one of the best results from a CdS-based photoelectrochemical (PEC) cell. Both the multidimensional nature and type II band alignment of the 1D/2D CdS/CdIn 2 S 4 heterostructure contribute to the enhanced photocatalytic and photoelectrochemical activity. The present work not only provides a new strategy for designing multidimensional 1D/2D heterostructures, but also documents the development of highly efficient energy conversion catalysts.
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JOM
·
2016
·Vol. 69
·期 10
·1950-1957
·
IF 1.798
Shi Qihua,Zhang Yimin,Liu Tao,Huang Jing,Liu Hong
To improve separation of V(IV) and Al(III) from aluminum-rich sulfuric acid leaching solution of stone coal, the two-stage separation by crystallization and solvent extraction methods have been developed. A co-extraction coefficient ( k ) was put forward to evaluate comprehensively co-extraction extent in different solutions. In the crystallization stage, 68.2% of aluminum can be removed from the solution. In the solvent extraction stage, vanadium was selectively extracted using di-2-ethylhexyl phosphoric acid/tri-n-butyl phosphate from the crystalline mother solution, followed by H 2 SO 4 stripped efficiently. A V 2 O 5 product with purity of 98.39% and only 0.10% Al was obtained after oxidation, precipitation, and calcination. Compared with vanadium extraction from solution without crystallization, the counter-current extraction stage of vanadium can be decreased from 6 to 3 and co-extraction coefficient ( k ) decreased from 2.51 to 0.58 with two-stage separation. It is suggested that the aluminum removal by crystallization can evidently weaken the influence of aluminum co-extraction on vanadium extraction and improve the selectivity of solvent extraction for vanadium.
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PROTEIN JOURNAL
·
2016
·Vol. 35
·期 2
·154-162
·
IF 1.029
Tian Mei-ling,Fang Ting,Du Mu-ying,Zhang Fu-sheng
To explore an efficient, safe, and speedy application of pulsed electric field (PEF) technology for enzymatic modification, effects of PEF treatment on the enzymatic activity, property and kinetic parameters of α-amylase were investigated. Conformational transitions were also studied with the aid of circular dichroism (CD) and fluorescence spectra. The maximum enzymatic activity of α-amylase was obtained under 15 kV/cm electric field intensity and 100 mL/min flow velocity PEF treatment, in which the enzymatic activity increased by 22.13 ± 1.14 % compared with control. The activation effect could last for 18 h at 4 °C. PEF treatment could widen the range of optimum temperature for α-amylase, however, it barely exerted any effect on the optimum pH. On the other hand, α-amylase treated by PEF showed an increase of V
max , t 1/2 and Δ G , whereas a decrease of K
m and k were observed. Furthermore, it can be observed from fluorescence and CD spectra that PEF treatment had increased the number of amino acid residues, especially that of tryptophan, on α-amylase surface with enhanced α-helices by 34.76 % and decreased random coil by 12.04 % on α-amylase when compared with that of untreated. These changes in structure had positive effect on enhancing α-amylase activity and property.
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JOURNAL OF SOLUTION CHEMISTRY
·
2016
·Vol. 45
·期 3
·359-370
·
IF 1.256
Zhu Xiao,Zhang Huan,Xu Yingjie
In order to uncover the micro-structural heterogeneities in solutions of ammonium based ionic liquids, triethylamine nitrate (N 222 NO 3 ) has been synthesized using acid–base neutralization and the 1 H NMR spectra of two binary mixtures, namely N 222 NO 3 /dimethyl sulfoxide (DMSO) and N 222 NO 3 /acetone at different concentrations, have been measured at 298.15 K. The internal reference method was adopted to obtain the concentration-dependent chemical shifts of –CH 3 in N 222 NO 3 , which have been correlated using the 1 H NMR local composition (LC) model to obtain the local mole fractions. It has been revealed that within N 222 NO 3 rich region, self-association of the ionic liquid was predominant instead of N 222 NO 3 –solvent interactions. However, in the solvent rich region, N 222 NO 3 mainly interacts with solvent molecules, indicating that the self-association network of N 222 NO 3 has been greatly destroyed by solvents. In addition, the different influences of DMSO and acetone have been detected. DMSO molecules more effectively destroy the original network of the ionic liquid, due to its higher dielectric constant. Also, LC behavior in N 222 NO 3 /DMSO systems is more significant than in N 222 NO 3 /acetone, indicating that DMSO can induce more obvious heterogeneities in DMSO/N 222 NO 3 mixtures, which is consistent with physicochemical properties and cellulose solubility of solutions.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-5
·
IF 4.259
Shi Chao,Wang Yifan,Zhang Menghua,Ma Cuiping
Nucleic acids have been shown to be versatile molecules and engineered to produce various nanostructures. However, the poor rate of these uncatalyzed nucleic acid reactions has restricted the development and applications. Herein, we reported a novel finding that DNA self-assembly could be nonenzymatically catalyzed by artificial agents with an increasing dissociation rate constant K2. The catalytic role of several artificial agents in DNA self-assembly was verified by real-time fluorescent detection or agarose gel electrophoresis. We found that 20% PEG 200 could significantly catalyze DNA self-assembly and increase the reaction efficiency, such as linear hybridization chain reaction (HCR) and exponential hairpin assembly (EHA). Therefore, we foresee that a fast and efficient DNA self-assembly in structural DNA nanotechnology will be desirable.
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COLLOID AND POLYMER SCIENCE
·
2017
·Vol. 295
·期 10
·1863-1871
·
IF 1.723
Zhang Zhiqing,Cui Mei,Wang Fang,Zhou Ting,Zhang Guodong,Wang Xiufeng
Ionic liquids (ILs) as environmental-friendly extractive solvents can remove aromatic heterocyclic sulfur compounds (S-compounds) from fuel oils, which due to their capacity for S-compounds (easy separation and higher selectivity). In this work, a series of polystyrene (PS)-supported polymeric ILs (PS-PILs or PS-6-PILs) with different alkyl side chain length were synthesized. Characterization with Fourier transform infrared (FTIR), nuclear magnetic resonance (NMR), elemental analysis, scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) demonstrated that IL monomers had been successfully loaded and polymerized on the surface of PS to form a thin polymer coating. The adsorptive desulfurization behavior of polystyrene-supported polymeric ILs was investigated by removing aromatic S-containing compound from model fuel (cyclohexane/thiophene, 2-methylthiophene, benzothiophene, and dibenzothiophene). Under the experimental conditions, the adsorption ability followed the order of PS < PS-PILs < PS-6-PILs. With the length of alkyl chain of imidazole ring increased, the desulfurization rate of thiophene was gradually increased, 2-methylthiophene was first increased and then decreased, benzothiophene and dibenzothiophene were slightly decreased. These trends were due to the different steric effect and aromatic π-electron density of ILs with different alkyl side chain length.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2017
·Vol. 32
·期 4
·772-776
·
IF 0.447
Xiang Tao,Wang Qingxiu,Duan Lijie,Liu Fude
A conjugated polymer of poly(4,4'-bis(thien-2-yl)azobenzene-co-3-hexylthiophene) (PTAB-H), bearing azo group in main chain and soluble in THF, chloroform, was synthesized through FeCl3 oxidation copolymerization with 3-hexylthiophene, and the monomer of 4,4'-bis(thien-2-yl)azobenzene was synthesized by Sandmeyer reaction and Suzuki reaction. The UV-Vis spectra of PTAB-H reveal that azo group in the main chain can extend the absorption and lower the band gap. The fluorescent spectra, photoluminescence (PL) spectra, cyclic voltammetry (CV) of PTAB-H were recorded.The gel permeation chromatography (GPC), thermogravimetry analysis (TGA), and differential scanning calorimetry (DSC) measurements indicated that the molecular weight Mn, Mw and polydispersity indices (PDI) of the polymer are 10 876 g/mol, 22 338 g/mol and 2.05 respectively and the temperature of 5% weight-loss is 224.6 °C. No glass transition and crystallization melting peak was observed in the temperature range from 30 °C to 400 °C.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2017
·Vol. 19
·期 5
·1-15
·
IF 2.02
Cheng Yang,Niu Helin,Chen Jingshuai,Song Jiming,Mao Changjie,Zhang Shengyi,Chen Changle,Gao Yuanhao
The hierarchical flower-like β-In 2 S 3 catalyst assembled from 2D nanosheets was prepared using an organic-component depletion method utilizing inorganic-organic hybrids indium diethyldithiocarbamate (In-DDTC) as a single-source precursor. The crystallization, morphology and composition of the as-synthesized β-In 2 S 3 were characterized by XRD, SEM, TEM, EDS and XPS, respectively. The β-In 2 S 3 possessed high specific surface area of 134.1 m 2 g -1 , adsorption capacity of 195.5 mg g -1 for methylene blue, and extreme photodecolorization speed under visible light irradiation for the complete removal of methyl orange (MO) dye within 15 min and tetracycline within 60 min. Although methyl orange concentration decreased quickly, the total organic carbon (TOC) decreased slowly. UV-vis and mass spectrometry (MS) were applied to analyze the intermediates coming from the photodecolorization of MO. In order to estimate the roles of active species during the decolorization of MO, trapping experiments were conducted to determine the main active species during the decolorization process. The results indicated that . O 2
− radicals and e -1 were the key intermediates. This enhanced activity was attributed to its unique structures assembled from 2D nanosheets with thickness of ca. 5-7 nm, leading to high specific surface area, wide range of pore size distribution and great efficiency in absorbing light and electron/hole separation. The hierarchical flower-like β-In 2 S 3 demonstrated great advantages in the treatment of various wastewater pollutants including textile dyes and antibiotics.
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AMINO ACIDS
·
2016
·Vol. 48
·期 7
·1601-1617
·
IF 3.196
Yu Haining,Guo Zhengzhao,Shen Shengrong,Shan Weiguang
As being a necessary amino acid, taurine plays an important role in the regulation of neuroendocrine functions and nutrition. In this study, effects of taurine on mice gut microbes and metabolism were investigated. BALB/C mice were randomly divided into three experimental groups: The first group was administered saline (CK), the second was administered 165 mg/kg natural taurine (NE) and the third one administered 165 mg/kg synthetic taurine (CS). Gut microbiota composition in mice feces was analyzed by metagenomics technology, and the content of short-chain fatty acids (SCFA) in mice feces was detected by gas chromatography (GC), while the concentrations of lipopolysaccharide (LPS) and superoxide dismutase (SOD) were detected by a LPS ELISA kit and a SOD assay kit, respectively. The results showed that the effect of taurine on gut microbiota could reduce the abundance of Proteobacteria , especially Helicobacter . Moreover, we found that the SCFA content was increased in feces of the NE group while LPS content was decreased in serum of the NE group; the SOD activity in serum and livers of the NE and CS groups were not changed significantly compare to that of the CK group. In conclusion, taurine could regulate the gut micro-ecology, which might be of benefit to health by inhibiting the growth of harmful bacteria, accelerating the production of SCFA and reducing LPS concentration.
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JOURNAL OF POLYMER RESEARCH
·
2016
·Vol. 23
·期 4
·1-10
·
IF 1.969
Xiao Xiane,Lu Shaorong,Pan Lulu,Zeng Cen,He Zihai,Gao Jian,Yu Jinhong
We reported a novel approach for epoxy composites by incorporation of hyperbranched polyglycerol (HPG) grafted sisal cellulose fibers (SCF). In this work, we have synthesized SCF wrapped HPG shell (SCF-g-HPG) by a “grafting from” strategy for the strong interfacial interaction between fillers and matrix. It was found that the thermal and mechanical properties of epoxy composites were greatly improved by incorporating SCF-g-HPG. For example, the impact strength, flexural strength, tensile strength, Young’s modulus and toughness of the composites with 3.0 wt% SCF-g-HPG loading were 38.35 KJ/m 2 , 123.40 MPa, 86.62 MPa, 151.7 MPa, and 417.84 MJ/m 3 , significantly increased by 119.1 %, 55.2 %, 45.6 %, 43.1 %, and 166.1 % respectively, as compared with neat epoxy. In addition, thermal stability of SCF-g-HPG/epoxy composites also showed an obvious enhancement compared with neat epoxy.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 7
·6829-6834
·
IF 1.798
Su Chang,Li Yu,Li Shouchun,Liu Li,Guo Xuexin,Lian Hongwei,Guan Xiulong
Pure and Pr-doped α-Fe 2 O 3 nanotubes are successfully synthesized via electrospinning and following calcined method. The crystal, morphologies structures and composed of the as-prepared samples are investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), respectively. The researches of the gas sensing properties of the samples show that Pr-doped α-Fe 2 O 3 nanotubes possess excellent sensitive to ethanol, and the response value of Pr-doped α-Fe 2 O 3 nanotubes to 10 ppm ethanol is 21.3 at the operating temperature 240 °C, which is much higher than that of pure α-Fe 2 O 3 nanotubes (1.5). That is to say that the ethanol sensitive of α-Fe 2 O 3 nanotubes is improved remarkably by doping Pr. Moreover, Pr-doped α-Fe 2 O 3 nanotubes show good selectivity and long-term stability.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 23
·期 12
·12019-12029
·
IF 2.76
Bai Naling,Wang Sheng,Abuduaini Rexiding,Zhu Xufen,Zhao Yuhua
Nonylphenol polyethoxylates (NPEOs), although banned for decades, are still widely used in manufactories and thus affect human lives. In this study, a highly efficient NPEO-degrading bacterium, Sphingomonas sp. Y2, was isolated from sewage sludge by enrichment culture. Strain Y2 ensured the complete removal of NPEO in 48 h and degraded 99.2 % NPEO (1,000 mg L −1 ) within 30 h at a specific growth rate of 0.73 h −1 in minimum salt medium. To date, this degradation efficiency is the highest reported for NPEO metabolism by a pure bacterium under this condition. Furthermore, the application of this bacterium to wastewater treatment demonstrated that it metabolized 98.5 % NPEO (1,000 mg L −1 ) within 5 days with a specific growth rate of 2.03 day −1 . The degradation intermediates, identified as nonylphenol, short-chain NPEOs and short-chain nonylphenol polyethoxycarboxylates by high-performance liquid chromatography and gas chromatography-mass spectrometry, indicated the sequential exo-cleavage of the EO chain. Additionally, the enzymes involved in the biodegradation were inducible rather than constitutive. Considering that strain Y2 exhibits prominent biodegradation advantages in industrial wastewater treatment, it might serve as a promising potential candidate for in situ bioremediation of contamination by NPEOs and other structurally similar compounds.
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