期刊：
Asian Journal of Chemistry,2015年27(8):2873-2875 ISSN：0970-7077
通讯作者：
Yang, M.
作者机构：
[Yang M.; Xia J.; Huang Y.] School of Chemistry and Environmental Engineering, Wuhan Polytechnic University, ChangQing Garden, Hankou, Wuhan, 430023, China
通讯机构：
[Yang, M.] S;School of Chemistry and Environmental Engineering, Wuhan Polytechnic University, ChangQing Garden, Hankou, Wuhan, China
关键词：
Fish gelatin;Hollow spheres;Nanoparticles;Platinum;Sol-gel
摘要：
Hollow spheres of platinum nanoparticles with an average diameter of 50-200 nm have been prepared by spheres of Se@Pt reaction with aqueous hydrazine. The products were characterized by X-ray powder diffraction, transmission electron microscopy, X-ray photoelectron spectra and and UV-visible absorption spectroscopy. The sizes of the nanoparticles of platinum were estimated by Debye-Scherrer formula according to XRD spectrum.
作者机构：
[Li, Furong; Bao, Jianguo] China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China.;[Li, Furong] Wuhan Polytech Univ, Chem & Environm Engn Coll, Wuhan 430023, Peoples R China.;[Lei, Yutian; Zhang, Tian C.] Univ Nebraska Lincoln, Civil Engn Dept, Omaha, NE 68182 USA.
通讯机构：
[Bao, Jianguo] C;China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China.
关键词：
Fenton-like reaction;adsorption;furfural;heat wrap;zero-valent iron (ZVI)
摘要：
In this study, the feasibility of using a combined adsorption and Fenton-like oxidation process (with zero-valent iron (ZVI) residue from heat wraps as an absorbent and catalyst) to remove furfural in the solution was evaluated. The influencing parameters (e.g. pH, H2O2 concentration, initial furfural concentration) and the reusability of ZVI residue (to replace the iron powder) were estimated. The ZVI residue was found to have much better adsorption effect on furfural at pH 2.0 compared with pH 6.7. For Fenton-like reaction alone with ZVI residue, the highest furfural removal of 97.5% was observed at the concentration of 0.176 mol/L H2O2, and all of the samples had >80% removal efficiency at different initial furfural concentrations of 2, 10, 20, 30 and 40 mmol/L. However, with a combined adsorption and Fenton-like oxidation, the removal efficiency of furfural was nearly 100% for all treatments. The ZVI residue used for furfural removal was much better than that of iron powder in the Fenton-like reaction at a seven-cycle experiment. This study suggests the combined process of adsorption and Fenton-like oxidation using ZVI residue is effective for the treatment of furfural in the liquid.
作者机构：
[章思汗; 戴志群; 张开诚; 刘可庆; 张智勇] Department of Chemistry and Environmental Engineering, Wuhan Polytechnic University, Wuhan, 430023, China;[宣丽] Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, 130033, China
摘要：
Based on carbon nanofibers (CNFs) loaded with ammonium pyrroinedithiocarbamate (APDC) as an adsorbent, a novel method is described for the preconcentration, separation, and determination of trace As(III) and Sb(III) by inductively coupled plasma mass spectrometry (ICP-MS). The adsorption behavior of the analytes on CNFs-APDC was investigated under dynamic conditions. The effects of pH, sample flow rate and volume, elution solution and interfering ions on the preconcentration and separation of the analytes were examined in detail. The adsorption capacity of CNFs-APDC for As(III) and Sb(III) was 3.6 mg g(-1) and 2.8 mg g(-1), respectively. Under the optimum conditions, the detection limit (3 sigma) of this method was 0.065 ng mL(-1) of As(III) and 0.012 ng mL(-1) of Sb(III), and the relative standard deviation (RSD) was 3.1% and 5.4%, respectively (n=9, c=1.0 ng mL(-1)). This method was applied to the determination of trace As(III) and Sb(III) in natural water samples with recoveries of 95.3-104%. In order to validate this method, a certified reference material of human hair (GBW 07601) was analyzed, and the determined values were in good agreement with the certified values.
摘要：
The charged nano-Al2O3 particles were successfully prepared by sol-gel method, and different approaches including scanning electron microscope, X-ray diffraction and Fourier transforms infrared spectrometry were used to characterize the Al2O3 nanoparticles. Meanwhile, the zeta potentials of Al2O3 nanoparticles were thoroughly investigated in this paper. The analysis results indicated that the prepared Al2O3 nanoparticles were found spherical in shape and demonstrated weak agglomeration. They had a fine crystal phase with a mean size of about 13.2nm. The analysis of Zeta potential demonstrated that the Al2O3 nanoparticles had a positive charge.
摘要：
Based on solidified floating organic drop microextraction (SFODME), a novel method was developed for speciation of inorganic arsenic (As(V)/As(III)) by electrothermal vaporization inductively coupled plasma mass spectrometry (ETV-ICP-MS). Ammonium pyrroinedithiocarbamate (APDC) was used as both a chelating reagent in SFODME and a chemical modifier in ETV. As(III) could react with APDC to form complexes at pH 5.5, and the complexes were quantitatively extracted into an organic phase of 1-dodecanol, whereas As(V) remained as a free species in the aqueous phase. As(III) was directly determined by ETV-ICP-MS. Total As was determined by the same method after reducing As(V) to As(III). The assay of As(V) was obtained by subtracting As(111) from total As. The main factors affecting the separation and determination, including pH, amount of APDC, extraction time, stirring rate, sample solution volume, and temperature program, were examined in detail. Under optimized conditions, the detection limits were 0.36 pg mL(-1) for As(III) and 0.91 pg mL(-1) for As(V). The relative standard deviations for As(III) and As(V) were 5.1% and 5.7% (c=1.0 ng mL(-1), n=9), respectively. This method was applied for the speciation of inorganic arsenic in natural water samples and standard reference materials with satisfactory results.
关键词：
Fluidic fuel;Viscosity;Temperature;Interaction potential;Momentum transfer
摘要：
Viscosity is a first and foremost function both for theory and application. By approximating the interaction potential of molecule in fluidic fuel as constant and proposing a new method to calculate the momentum transfer by means of the radius of averaged volume per molecule, an equation of viscosity versus temperature was derived, which were found in good agreement with a lot of data from gaseous to liquid fuels by the curve fit. The equation also predicted that the viscosity initially decreased with temperature and then slowly increased in the high temperature region. When using it as correlation equation for the dependence of viscosity on temperature, it was able to cover more fluids from gaseous to liquid fuels. (C) 2015 Elsevier Ltd. All rights reserved.
摘要：
Halovirus is a major force that affects the evolution of extreme halophiles and the biogeochemistry of hypersaline environments. However, until now, the systematic studies on the halovirus ecology and the effects of salt concentration on virus-host systems are lacking. To provide more valuable information for understanding ecological strategies of a virus-host system in the hypersaline ecosystem, we studied the interaction between halovirus SNJ1 and its host Natrinema sp.J7-2 under various NaCl concentrations. We found that the adsorption rate and lytic rate increased with salt concentration, demonstrating that a higher salt concentration promoted viral adsorption and proliferation. Contrary to the lytic rate, the lysogenic rate decreased as the salt concentration increased. Our results also demonstrated that cells incubated at a high salt concentration prior to infection increased the ability of the virus to adsorb and lyse its host cells; therefore, the physiological status of host cells also affected the virus-host interaction. In conclusion, SNJ1 acted as a predator, lysing host cells and releasing progeny viruses in hypersaline environments; in low salt environments, viruses lysogenized host cells to escape the damage from low salinity.
摘要：
Acyclovir-loaded PAN/PVP composite nanofibers were prepared using co-dissolving methods and electrospinning processes. N, N-Dimethylacetamide was selected as the co-dissolving solvent of PAN, PVP and acyclovir. Compared with acyclovir-loaded PAN nanofibers, the acyclovir-loaded PAN/PVP composite nanofibers exhibited more uniform structure and homogenous drug distributions, which was indicated by the polarized microscopy images. XRD and FTIR results demonstrated that the presence of PVP in the drug-loaded nanofibers increased the compatibility between the drug and the polymer matrix and resulted in the amorphous acyclovir status through the hydrogen bonding and hydrophobic interactions among the components. In vitro dissolution tests showed that the acyclovir-loaded PAN/PVP composite nanofibers could provide better drug controlled release profiles with less initial drug release burst effect, bigger percentage drug free out and relatively long time drug release time periods. Composite nanofibers with hydrophilic polymer PVP and PAN could improve their drug-loaded capability, drug controlled release profiles and their microstructure uniformity.
