RSC Advances
·
2015
·Vol. 5
·期 88
·71749-71755
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IF 3.84
Xueni Li,Longzhen Zheng,Yimin Wang,Nan Zhang,Yan Lou,Ting Xiao,Jiani Liu
This paper reports on an experimental research of a 2-hydroxypropyl-β-cyclodextrin (HP-β-CD) enveloped 10-methylphenothiazine (MPT) catalyst (MPT-HP-β-CD) with high sensitivity and wonderful electrical conductivity for the electrochemical detection of reduced glutathione (GSH) in a neutral environment. We obtained a linear response range from 10−6 mol L−1 to 5.8 × 10−4 mol L−1 for GSH with a low detection limit of 2.87 × 10−7 mol L−1, providing a potentially usefulness in the development of sensors for non-enzyme detection of GSH.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2015
·
IF 2.037
Xiaoxing Lu,Di Wu,Dengfeng Ye,Youping Wang,Yongsheng Guo,Wenjun Fang
Two guanidinium-based ionic liquids (ILs), 2-ethyl-1,1,3,3-tetramethylguanidinium bis(trifluoromethylsulfonyl)imide ([TMGEt][NTf2]) and ethyl sulfate ([TMGEt][C2OSO3]) were synthesized and characterized. Experimental densities and viscosities for the binary mixtures of the ILs with ethanol and 1-propanol from (293.15 to 323.15) K were measured over the whole composition range and at the atmospheric pressure of 0.1 MPa. The excess molar volumes (VmE) and the viscosity deviations (Δη) for the binary systems were calculated and fitted with the Redlich–Kister equation. It is found that the density of [TMGEt][NTf2] is much higher than that of [TMGEt][C2OSO3] at the same temperature, while the viscosity of the former with the value of 74.61 mPa·s is only 1/9 of that of the latter at 293.15 K. This indicates that the difference of the anions has a significant influence on the density and viscosity of the ILs with the same guanidinium cation. The addition of ethanol or 1-propanol leads to negative values of VmE and Δη, which result from the efficient packing of the constituents in the binary mixtures and the weakening of anion–cation interactions of the ILs. The partial molar volumes, excess partial molar volumes, Gibbs energy, and excess Gibbs energy of activation for viscous flow of the binary mixtures also have been calculated. It is hoped that the results provide useful information for the fundamental physicochemical properties of the guanidinium-based ILs and their further applications.
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RSC Advances
·
2015
·Vol. 5
·期 51
·40726-40736
·
IF 3.84
Zhi Zhu,Ziyang Lu,Xiaoxu Zhao,Yongsheng Yan,Weidong Shi,Dandan Wang,Lili Yang,Xue Lin,Zhoufa Hua,Yang Liu
In the present work, based on Fe3O4/g-C3N4 as the support, 2-mercaptobenzothiazole (MBT) as the template molecule, and pyrrole as the functional monomer, we synthesized magnetic conductive imprinted photocatalysts (MCIPs) that were significantly efficient and stable through a suspension polymerization method. Moreover, the MCIPs not only exhibited a higher photodegradation capacity for MBT under visible light irradiation, but also possessed good selectivity. The specific surface areas of the resultant MCIPs were approximately four times that of pure g-C3N4. Furthermore, the results indicated that h+ was the major reactive species in the photocatalytic reaction system. The photodegradation mechanism was also discussed by analyzing the mass spectrum (MS), and the results demonstrated that MBT was degraded to H2O, CO2 and other small molecules, step by step. In addition, after five cycles, the MCIPs still showed high photocatalytic efficiency, indicating that the as-prepared MCIPs had excellent photochemical stability and good prospects for application in water treatment.
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Journal of Physical Chemistry C
·
2013
·
IF 4.814
Yongfeng Liu,Chao Li,Bo Li,Mingxia Gao,Hongge Pan
The hydrogen storage properties and mechanisms of the Mg(NH2)2–2LiH system with potassium halides (KF, KCl, KBr, and KI) were investigated and discussed. The results show that the KF-added sample exhibits superior hydrogen storage properties as ∼5.0 wt % of hydrogen can be reversibly stored in the 0.08KF-added sample via a two-stage reaction with an onset dehydrogenation temperature of 80 °C. However, hydrogen storage behaviors of the samples with KCl, KBr, and KI remain almost unchanged. The fact that KF can readily react with LiH to convert to KH and LiF due to the favorable thermodynamics during ball milling should be the primary reason for its significant effects, as the presence of KH provides a synergetic thermodynamic and kinetic destabilization in the hydrogen storage reaction of the Mg(NH2)2–2LiH system by declining the activation energy of the first-step dehydrogenation as a catalyst and reducing the desorption enthalpy change of the second step as a reactant. The understanding on the role played by KF sheds light on how to further decrease the operating temperature and enhance the hydrogen storage kinetics of the metal–N–H system.
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JOURNAL OF BIOTECHNOLOGY
·
2013
·
IF 3.183
Zong-Bo Xie,Na Wang,Wan-Xia Wu,Zhang-Gao Le,Xiao-Qi Yu
A simple, mild, one-pot tandem method catalyzed by trypsin was developed for the synthesis of 3,4-dihydropyrimidin-2(1 H )-ones by the Biginelli reaction of urea, β-dicarbonyl compounds, and in situ-formed acetaldehyde. Trypsin was found to display dual promiscuous functions to catalyze transesterification and the Biginelli reaction in sequence.
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JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2015
·Vol. 54
·期 8
·1036-1043
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IF 3.113
Xueteng Cao,Daniel Horák,Zesheng An,Zdeněk Plichta
Nonspecific interaction is a key parameter affecting the efficiency of proteins, nucleic acids or cell separation. Currently, many approaches to introduce antifouling properties to materials have been developed. Among these, surface modification with polymer brushes plays a prominent role. The aim of this study was to synthesize new magnetic microspheres grafted with poly( N,N -dimethylacrylamide) (PDMA) that resist nonspecific protein adsorption. Monodisperse macroporous poly(2-hydroxyethyl methacrylate) (PHEMA) microspheres, 4 μm in size, were synthesized by a multiple swelling polymerization method. To render the microspheres magnetic, iron oxide was precipitated inside the microsphere pores. Functional carboxyl groups, introduced by the hydrolysis of the 2-(methacryloyl)oxyethyl acetate (HEMA-Ac) comonomer, were used to react with propargylamine, followed by coupling of a chain transfer agent via an azide-alkyne click reaction. PDMA was grafted from the PHEMA microspheres using reversible addition-fragmentation chain transfer polymerization (RAFT), resulting in surfaces with more than 81 wt % PDMA attached. The successful modification of the microspheres was confirmed by XPS. The magnetic microspheres grafted with PDMA showed excellent antifouling properties as tested in bovine serum protein solutions. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016 , 54 , 1036–1043
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JOURNAL OF NUCLEAR MATERIALS
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2015
·
IF 1.865
Kuibao Zhang,Guanjun Wen,Dan Yin,Haibin Zhang
Synroc is recognized as the second generation waste form for the immobilization of high-level radioactive waste (HLW). Zirconolite-rich (CaZrTi 2 O 7 ) Synroc minerals were attempted by self-propagating high-temperature synthesis (SHS) using Fe 2 O 3 , CrO 3 , Ca(NO 3 ) 2 as the oxidants and Ti as the reductant . All designed reactions were ignited and sustained using Ca(NO 3 ) 2 as the oxidant, and zirconolite-rich ceramic matrices were successfully prepared with pyrochlore (Ca 2 Ti 2 O 6 ), perovskite (CaTiO 3 ) and rutile (TiO 2 ) as the minor phases. The sample CN-4, which was designed using Ca(NO 3 ) 2 as the oxidant with TiO 2 /Ti ratio of 7:9, was readily solidified with density of 4.62 g/cm 3 and Vickers hardness of 1052 HV. CeO 2 was successfully stabilized by the CN-4 sample with resultant phase constituent of 2M-CaZrTi 2 O 7 and CaTiO 3 .
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2015
·
IF 2.729
Hongjuan Li,Ying Liu,Haizhu Jin,Sujing Liu,Shengtao Fang,Chunhua Wang,Chuanhai Xia
Vitexin-4″- O -glucoside and vitexin-2″- O -rhamnoside are the major flavonoids of hawthorn leaves. In this work, the adsorption and desorption characteristics of vitexin-4″- O -glucoside and vitexin-2″- O -rhamnoside on seven macroporous resins were evaluated. Among the tested resins, the HPD-400 resin showed the best adsorption and desorption capacities. Adsorption isotherms were constructed for the HPD-400 resin and well fitted to Langmuir and Freundlich models. Dynamic adsorption and desorption tests were performed on column packed with the HPD-400 resin to optimize the chromatographic parameters. After one run treatment with the HPD-400 resin, the contents of vitexin-4″- O -glucoside and vitexin-2″- O -rhamnoside in the product were increased 8.44-fold and 8.43-fold from 0.720% and 2.63% to 6.08% and 22.2% with recovery yields of 79.1% and 81.2%, respectively. These results show that the developed method is a promising basis for the large-scale purification of vitexin-4″- O -glucoside and vitexin-2″- O -rhamnoside from hawthorn leaves and other plant materials.
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HYDROMETALLURGY
·
2014
·
IF 2.224
Mohannad Mayyas,Mohammad Al-Harahsheh,Xian-Yong Wei
Jordanian phosphate ore contains 70–150 parts per million (ppm) uranium. The uranium in the ore tends to dissolve during the leaching of phosphate ore with sulfuric acid to produce phosphoric acid (PA). Solvent extraction (SX) using various extracting agents is widely used to extract uranium from PA. Meanwhile, much research work has been carried out to develop suitable solid phase extractants in order to reduce cost and enhance efficiency. In this study, a new solid phase extractant has been synthesized by anchoring 2-hydroxy-4-aminotriazine onto activated carbon (ACH). The extraction of uranium from Jordanian PA using ACH and the synergistic mixture of di-ethylhexyl phosphoric acid and trioctyl phosphine oxide (DEPA–TOPO) diluted in kerosene were investigated and the performance of each extractant was evaluated and compared. The results showed that 91% extraction and 559.9 ppm loading capacity were achieved after 2 to 3 min mixing time using 0.5 M DEPA–0.125 M TOPO at 20 °C, 410 mV and 1/1 phase ratio. The activation energy ( E a ) of the solvent extraction (− 26.03 kJ mol − 1 ), calculated from Arrhenius plot, indicates that the reaction is barrier-less and exothermic in nature. On the other hand, uranium sorption onto ACH reaches equilibrium after 10 min and about 92% extraction can be achieved at 20 °C, C o = 70 mg/l, V = 200 ml, W = 100 mg and 410 mV; the rate constant for the uranium sorption onto ACH (16.54 × 10 − 3 g mg − 1 min − 1 ) was calculated from the pseudo-second order equation. The countercurrent extraction results showed that ACH has high physical, chemical stability and loading capacity about 618 mg g − 1 . Thermodynamic parameters ( ΔH ads ° = 20.61 kJ mol − 1 , ΔS ads ° = 160.47 J mol − 1 K − 1 , ΔG ads ° (333.3 K) = − 32.87 kJ mol − 1 ) suggest that the adsorption is endothermic and spontaneous in nature, which confirm the feasibility of the process.
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JOURNAL OF STRUCTURAL CHEMISTRY
·
2015
·Vol. 56
·期 3
·458-462
·
IF 0.508
Huang Q. -W.,Liu S. -G.,Li G. -B.,Wang S. -X.,Su W. -Y.,Liang D. -M.,Mao S. -Q.
A new complex Cu(bpbp)Cl 2 ·DMF·H 2 O is synthesized by treatment of CuCl 2 with 2,6-bis(1-phenylbenzimidazol-2-yl)pyidine in DMF. Its structure is characterized by elemental, IR, UV, and single crystal X-ray structure analyses. For the complex: crystal system, triclinic, space group \(P\bar 1\) , a = 1.0537(1) nm, b = 1.1735(1) nm, c = 1.3749(2) nm, α = 112.275(2)°, β = 91.531(2)°, γ = 97.700(2)°, V = 1.553(4) nm 3 , Z = 2. In a distorted trigonal bipyramidal geometry the Cu(II) ion is coordinated by three nitrogen atoms from 2,6-bis(1-phenylbenzimidazol-2-yl)pyridine and two chloride ions. The antiproliferative activities of the complex are screened by MTT assay against HepG2, Huh7, Eca109, and Eca9706 cancer cells. The complex exhibits specific inhibition on Eca9706 cancer cells with the IC 50 value of 28 μM after 48 h treatment. CCDC: 968927.
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CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Fa-tang Li,Biao Wu,Rui-hong Liu,Xiao-jing Wang,Lan-ju Chen,Di-shun Zhao
Inexpensive N-methyl-pyrrolidone (NMP)-based ionic liquids (ILs) are synthesized by coordinating N-methyl-pyrrolidone with anhydrous FeCl 3 or ZnCl 2 . The introduction of metal chlorides lowers the solubility of NMP for actual diesel. The obtained C 5 H 9 NO·0.3FeCl 3 IL shows remarkable extraction ability for dibenzothiophene (DBT) with Nernst partition coefficients ( k N ) above 7.5, which can be attributed to its low viscosity and bifunctional extractive groups of five-membered ring of NMP and unoccupied orbitals of Fe ion. The oxidative desulfurization of DBT using H 2 O 2 as oxidant and ILs as extractants are investigated. The scavenger experiments and electron paramagnetic resonance (EPR) measurement verify the active species is hydroxyl radical ( OH) responsible for the oxidation of DBT. FeCl 3 -based ILs show much better effects in catalyzing H 2 O 2 to generate OH than ZnCl 2 -based ILs. The process and mechanism for extraction and catalytic oxidation of DBT in an oil–ionic liquid–H 2 O 2 system are proposed. The C 5 H 9 NO·0.3FeCl 3 IL shows excellent recycling performance. After six-run experiment, there is only little loss in activity, which can be ascribed to the high solubility (18,190 ppm) of dibenzothiophene-sulfone (DBTO 2 ), the main oxidation product of DBT, in the IL.
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ADVANCED POWDER TECHNOLOGY
·
2014
·
IF 1.642
Hongtao Cui,Junyin Xue,Minmin Wang
α-Ni(OH) 2 nanosheets were prepared at room temperature on ultra large scale through a solvent-free reaction. The nanosheets were obtained by grinding the mixture of nickel nitrate hexahydrate and morpholine in a mortar for 5 min. The maximum capacity of production in single batch was only limited by volume of the vessels used in preparation. The as-prepared nanosheets exhibited the highest specific capacitance of 2080.8 F g −1 at discharge current density of 0.6 A g −1 in a 6 mol l −1 KOH aqueous solution. The nanosheets also presented other high electrochemical performances such as nearly 100% coulombic efficiency, excellent rate capacity and high stability. These results indicated that the α-Ni(OH) 2 nanosheets can be used as a high performance electrochemical material for application in supercapacitor .
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