Synthesis,Structure and Magnetic Analysis of the Cobalt Polymer Based on N-[(3-pyridine)-sulfonyl]aspartate

One new cobalt polymer [Co(L)·3H_2O]_n(1, H_2L=N-[(3-pyridine)-sulfonyl]aspartate) has been synthesized and characterized by single-crystal X-ray diffraction and elemental analysis. Polymer 1 belongs to the monoclinic system, space group P21/n with a=11.479(2), b=7.3180(15), c=16.424(3) ?, β=109.56(3)°, V=1300.1(5) ?~3, Mr=385.22, Z=12, F(000)=790, S=1.054, R=0.0670, wR=0.1147,(Δρ)max=1.158 and(Δρ)min=–0.754 e/?~3. TGA showed that the polymer first lost one coordinated water molecule and then another two coordinated water molecules. The values of the Curie and Curie-Weiss constants of polymer 1 are Cm=2.67 cm^3mol^(–1) K and θ=–21.66 K.

Syntheses, Structures and Anticancer Activities of Three 4(3H)-Quinazolinone Cd(Ⅱ) Complexes

The title complexes based on 4(3H)-quinazolinone ligand have been synthesized and characterized by elemental analysis, IR spectrum and single-crystal X-ray diffraction analysis.Complex 1 belongs to the triclinic system, space group P1, with a = 6.5392(3), b = 7.4402(5), c =10.3397(7) ?, α = 83.204(5), β = 75.465(5), γ = 86.075(5)° and V = 483.88(5) ?~3. Complex 2 is of orthorhombic system, space group Pbca, with a = 10.1294(3), b = 7.6747(5), c = 23.8171(15) ? and V = 1849.1(4) ?~3. Complex 3 belongs to the orthorhombic system, space group Pbca, with a =12.7188(2), b = 6.66582(9), c = 25.6987(6) ? and V = 2178.77(5) ?~3. The complex structures are affected by the synthesis conditions.

Characterization and Synthesis through Fast Phase-Transfer of Oil-Soluble Double-Coordinated Tea-Polyphenols Arsenic

Fast phase-transferring was adopted in ethanol solution at the condition of n (oil-soluble tea pol-yphenol): N (As3﹢) = 2:1, 4:1, 6:1, pH = 4.0, temperature 40°C - 45°C, action period of 15 h to compose the target, of which the productivity was 59%, UV was 267.50, 218.00, 220.50 nm, FTIR was 6291, 34158.6, 2850.2, 1708.2;1457.3;1370.4, 1224.2, 1144.0, 760.5 cm﹣1, fluorescence value λmax = 257, 591.1, 593.7, 590.3, 591.0, 591.5, XRD λ/nm is 3.6974, 4.186, 12.0762, 15.4747, 1H-NMRδ = 0.782, 1.193, 1.483 - 1.586, 1.959 - 2.184, 2.479, 3.116, 3.970 - 3.981, 5.231 - 5.753, 6.537 - 7.300. Finally it was ascertained through XRD as double-coordinated polycrystal compound.

Apparent Molar Volumes and Solvation Coefficients in Ternary-pseudo-binary Mixtures [(Styrene+Ethyl Acetate or Benzene)+(N-Methyl-2-pyrrolidone+Ethyl Acetate or Benzene)]

Over the full range of compositions,in the ternary-pseudo-binary mixtures of x[(1-y)C6H5CH=CH2+ yCH3COOC2H5(or C6H6)]+(1-x)[(1-y)NMP+yCH3COOC2H5(or C6H6)],the apparent molar volumes of each pseudo-pure component at different y values were calculated from the density data at 298.15 K and atmospheric pressure.The results show that the four parameters cubic polynomial can correlate the apparent molar volume with the molar fraction well over the full molar fraction range.The limiting partial molar volumes and the molar volumes of each pseudo-pure component were evaluated with different methods.Based on the limiting partial molar volume and molar volume at a certain y value,a new universal coefficient termed as solvation coefficient γ was defined to describe quantitatively the solvation degree of pseudo-pure solute and the interactions of solute-solvent molecules from the macroscopical thermodynamics viewpoint.The results demonstrate the solvation coefficients decrease with the amount of the third component increasing for each pseudo-pure solute,irrespective of the pseudo-pure solvent.Then the solvation degrees of each pseudo-pure component,the specific interactions between the solute molecule and the solvent one were discussed in terms of the solvation coefficient.

Influence of surfactants on bioleaching of arsenic-containing gold concentrate

To shorten the bioleaching cycle of arsenic-containing gold concentrate, surfactants were used to promote the interaction between bacteria and ore to increase the arsenic leaching rate. Three different kinds of surfactants were used to evaluate the effects of surfactants on the growth of bacteria and arsenic leaching rate of arsenic-containing gold concentrate. The mechanism underlying surfactant enhancement was also studied. Results show that when relatively low-concentration surfactants are added to the medium, no significant difference is observed in the growth and Fe2+ oxidation ability of the bacteria compared with no surfactant in the medium. However, only the anionic surfactant calcium lignosulfonate and the nonionic surfactant Tween 80 are found to improve the arsenic leaching rates. Their optimum mass concentrations are 30 and 80 mg/L, respectively. At such optimum mass concentrations, the arsenic leaching rates are approximately 13.7% and 9.1% higher than those without the addition of surfactant, respectively. Mechanism research reveals that adding the anionic surfactant calcium lignosulfonate improves the percentage of bacterial adhesion on the mineral surface and decreases the surface tension in the leaching solution.

Mechanism of electro-generative-leaching of chalcopyrite-MnO_2 in presence of Acidithiobacillus ferrooxidans

To clarify the role and mechanism of Acidithiobacillus ferrooxidans (A. ferrooxidans) in bio-electro-generative-leaching (BEGL), an experiment was made on the electro-generative leaching of chalcopyrite-MnO2 in the presence of the bacteria which grew respectively in Fe(Ⅱ) and S0 media. A dual cell system with chalcopyrite anode and MnO2 cathode was used to study the relationship between time and both of electric quantity and dissolved rate of the two minerals in BEGL. The results show that the dissolved rates for Cu2+ and Fe2+ under the action of the bacteria cultivated by S0 medium are almost 2 times faster than those by Fe(Ⅱ). And the leaching ratio for Mn2+ and the electric output increase by near 3 times. The oxidation residue of chalcopyrite was characterized by SEM and XRD, whose patterns are similar to those of raw ore in BEGL. The mechanism of anodic reaction for CuFeS2-MnO2 leaching in the presence of A. ferrooxidans cultivated by S0 medium is proposed as a successive reaction of two independent sub-processes. The first stage is the dissolution of chalcopyrite to produce Cu2+, Fe2+ and sulfur, and the second stage is bio-oxidation of sulfur, which is the control step of the process. However, dissolution of MnO2 lasts until the reaction of chalcopyrite stops or the ores exhaust in two types of leaching.

Electrogenerative leaching for sphalerite-MnO_2 in the presence of Acidithiobacillus thiooxidans

A dual cell system was used to study the electrogenerative leaching sphalerite-MnO2 in the presence and absence of Acidithiobacillus thiooxidans (A. thiooxidans). The polarization of anode and cathode, and the relationship between the electric quantity (Q) and some factors, such as the dissolved rate of Zn2+ and Fe2+, and the time in the bio-electro-generating simultaneous leaching (BEGL) and electro-generating simultaneous leaching (EGL) were studied. A three-electrode system was applied to studying anodic and cathodic self-corrosion current, which was inappreciable compared with the galvanic current between sphalerite and MnO2. The results show that the dissolved Zn2+ in the presence of A. thiooxidans is nearly 43% higher than that in the absence of A. thiooxidans; the electrogenerative quantity in the former is about 150% more than that in the latter. The accumulated sulfur on the surface of sulfides produced in the electrogenerative leaching process can be oxidized in the presence of A. thiooxidans, and the ratio of biologic electric quantity reaches 27.9% in 72 h.

Effect of Heavy Metal Stress on Seed Germination of Albizia julibrissin

[Objectives]This study was conducted to investigate the effects of different heavy metal stresses on seed germination,in order to provide a theoretical basis for phytoremediation of soil heavy metal pollution.[Methods]With the seeds of A.julibrissin as an experimental material,the germination test of A.julibrissin seeds under different concentrations of Cu^(2+),Zn^(2+) and Pb^(2+) was carried out.The germination potential,germination rate,germination index,radicle length,embryo length and other indexes were measured.[Results]①Different heavy metals had different effects on the germination of A.julibrissin seeds.Low concentrations of Cu^(2+),Zn^(2+) and Pb^(2+) stresses had certain promotion effects on the germination of A.julibrissin seeds,but high concentrations of Cu^(2+),Zn^(2+),Pb^(2+) stresses had obvious inhibitory effects on the germination of A.julibrissin seeds.②There were obvious differences in the tolerance of A.julibrissin seeds to different metal ion stresses.According to the comparison of the average values of membership functions,the order of their tolerance to different heavy metal ions was:Zn^(2+)>Cu^(2+)>Pb^(2+).[Conclusions]In the case of light pollution,the germination of A.julibrissin seeds was not inhibited,and the use of this plant for the remediation of lightly contaminated soil with heavy metals can also be considered.

Magnetization of Nano-Size Subsystem in a Two-Dimensional Ising Square Lattice

A two-dimensional Ising square lattice is modeled as a nano-size block array to study by Monte Carlo simulation the magnetic thermal stability of nano-structure magnetic media for data storage, thereon in the blocks J1 > 0 is assigned for the interaction of a pair of nearest-neighbor spins, while 0 J0 J1 for that in regions between the blocks and (J0 + J1)/2 for the nearest-neighbor pairs with one in the block and the other one out of but near-most the block. We show that the magnetic thermal stability of the block accrues with the increase of J1 and with the decrease of J1 - J0 for a given J1, but contrarily, the anchoring ability for the initial magnetic orientation in nano-size block trails off as J1 - J0 diminish. This phenomena and size dependence of such anchoring ability are discussed in detail.

DCLR Modifi ed Petroleum Asphalt Optimization and Mixture Road Performance

In recent decades,modified asphalt materials have been used in enhancing the traffic load on the roads.The main objective of this paper is to explore the modifi cation effect of direct coal liquefaction residue(DCLR)on as-phalt binders and investigate the effectiveness of DCLR in improving the performance of asphalt road.This paper prepared modifi ed petroleum as-phalt under diff erent process conditions and tested its penetration,softening point and ductility index.Based on the experimental data,according to gray correlation degree,the performance for the asphalt was compared.The performance for the modified asphalt is simulated and predicted using poly-nomial functions.The modifi ed asphalt was analyzed by FT-IR,TGA,SEM and HPLC.The results show that the optimal process conditions for DCLR modifi ed asphalt are shear mixing time of 45 min,shear mixing tempera-ture of 150℃ and shear mixing rate of 4000 r/min.The predicted fit with the experimental data of 0.993 further demonstrates the effectiveness of the method.The characterization results show no significant chemical change between the DCLR and the asphalt.DCLR can significantly improve the high temperature performance and water stability of the asphalt,but it has little impact on its low temperature performance.

Dissipation behavior, residue distribution and dietary risk assessment of chlorfenapyr and clothianidin in leek using RRLC-QqQ-MS/MS technique

Commercial suspension emulsion(SE) of(8% chlorfenapyr + 20% clothianidin), as a pre-registered product in China, was firstly investigated under Chinese open-field conditions. A MWCNTs-based QuEChERS method for simultaneous determination of chlorfenapyr and clothianidin in leek was established and validated through rapid resolution liquid chromatography triples quadrupole tandem mass spectrometry(RRLC-QqQ-MS/MS). Based on this method, the dissipation behaviors, residue distributions and dietary risk probability of these fungicides in leek from two representative locations in China in 2016, which were previously treated with these insecticides at the doses of 420–630 g a.i./ha twice applications, were further investigated for food safety. Dissipation behavior of chlorfenapyr and clothianidin in leek followed first-order kinetics with the half-lives of 2.9–7.2 days, and the highest residues(HR) of these insecticides in leek were below 0.3811 mg/kg and 0.2989 mg/kg, respectively, at the pre-harvest interval(PHI, 7 days). For dietary risk assessments, the risk quotients(RQs) of chlorfenapyr and clothianidin in leek were evaluated by comparing the value of national estimated daily intake(NEDI) with acceptable daily intake(ADI), based on the trials data under good agricultural practices(GAP) conditions. The results indicated that RQs of chlorfenapyr and clothianidin in leek were21.5% and 0.29%, respectively, which exhibited an acceptably low health risk to leek consumption. The current study could not only guide reasonable usage of the formulation, but also facilitate the setting of maximum residue limits(MRLs) of chlorfenapyr and clothianidin in leek for Chinese

Cyanidin-horseradish peroxidase-hydroperoxide reaction system and its application in enzyme-linked immunosensing assays

A cyanidin-based horseradish peroxidase(HRP)-catalyzed reaction system was established in this work.In B-R buffer solutions(pH 6.8),a UV-visible absorbance peak of cyanidin(CAG) at 540 nm(Ap1) appeared.After the oxidation reaction of CAG catalyzed by HRP in the presence of H2O2,a significant absorbance peak at 482 nm(Ap2) occurred.The ratio R(AP2/AP1)was proportional to the HRP concentration.The application of CAG in the enzyme-linked immunosensing assays was investigated using food and mouth disease virus antigen(FMDVAg) as a model analyte.In sandwich immunoreaction,the analyte FMDVAg and food and mouth disease virus antibody(FMDVAb)-modified magnetic nanoparticles bound the supported conconvalina(Con A) bound with HRP-FMDVAb.After de-absorbing and separating,the HRP-FMDVAb-FMDVAg-FMDVAb-magnetic nanoparticles complexes were subject to enzymatic reaction and UV-visible absorbance measurements.The HRP moiety of the immunoreaction complexes can catalyze the oxidation reaction of CAG by H2O2,and the substrate CAG is converted to products.Based on this principle,a sandwich assay model has been employed to determine FMDVAg in rabbit serum samples with the aid of FMDVAb-Fe3O4 magnetic nanoparticles.The linear range of the FMDVAg determination is 1.5×10-8-2.7×10-6 g/mL with the relatively standard deviation of 3.7%(n = 11).The detection limit is 3.1×10-9 g/mL.Additional advantages of the typical substrate such as OPD,OAP and TMB are good water-solubility and stability.