摘要：
A new macrocyclic dinuclear Zn(II) complex is synthesized by the cyclocondensation between 3,3 '(ethane-1,2-diylbis (benzylazanediyl))bis(methylene) bis (2-hydroxy-5-methyl-benzaldehyde) and 1,3-diaminopropane and the subsequent with zinc salts. The as-prepared complex is characterized by elemental analysis, FT-IR, ES-MS and single crystal X-ray diffraction. The complex consists of one independent molecular unit of [Zn-2(mu-OAC)L](+) ClO4- and two water molecules with one on a symmetry element. Four of these units collectively form two pairs of dinuclear complex units of [Zn-2(mu-OAc)L](+) with one unit sharing two perchlorate ions and one water molecule and the other unit sharing two perchlorate ions and one symmetry equivalent water molecule. Each zinc(II) ion exhibits a slightly distorted square pyramidal geometry. Two Zn atoms are bridged by two oxygen atoms of an acetate anion and two phenolic O atoms. The Zn-Zn distance is 2.951 angstrom. An ordered two-dimensional network is formed by weak intermolecular interactions in the crystal structure of the complex. The phosphate ester hydrolysis activity and the antibacterial activity of the complex are studied. The results showed that the synthesized complex has an ef ficient catalytic activity of phosphoester bond cleavage and the potential to inhibit the growth of E. coli . The optimum catalytic rate constant (k(cat)) at pH 7.8 for the hydrolysis of 4nitrophenyl phosphate disodium salt hexahydrate (pNPP) by the synthesized complex is 2.98 x 10(-4) s(-1) , and 10(5) times faster than that the spontaneous hydrolysis of the phosphate monoester. Published by Elsevier B.V.
摘要：
<jats:title>Abstract</jats:title><jats:p>Dinuclear Ni(II) macrocyclic complex <jats:bold>A</jats:bold> ([Ni<jats:sub>2</jats:sub>L<jats:sup>1</jats:sup>OAc]ClO<jats:sub>4</jats:sub>⋅CH<jats:sub>3</jats:sub>OH⋅H<jats:sub>2</jats:sub>O) and dinuclear Ni(II) acyclic complex <jats:bold>B</jats:bold> ([Ni<jats:sub>2</jats:sub>L<jats:sup>2</jats:sup>](ClO<jats:sub>4</jats:sub>)<jats:sub>2</jats:sub>) were synthesized by condensation between H<jats:sub>2</jats:sub>L (3,3′‐(ethane‐1,2‐diylbis(benzylazanediyl))bis(methylene)bis(2‐hydroxy‐5‐methyl‐benzaldehyde)) and different molar equivalent 1,3‐propanediamine in the presence of Ni(II) ions. The structures of complexes were characterized by IR spectroscopy, elemental analysis, electrospray mass spectra and X‐ray single crystal diffraction. In complex <jats:bold>A</jats:bold>, the Ni(II)‐Ni(II) distance was 2.9413(7) Å, bridged by two phenolic oxygens and an acetate anion, while in complex <jats:bold>B</jats:bold>, it was 3.0540(1) Å, only bridged by two phenolic oxygens. The calf thymus DNA (CT‐DNA) binding ability was studied through spectroscopic and electrochemical methods, the corresponding binding constant for complexes <jats:bold>A</jats:bold> and <jats:bold>B</jats:bold> were 6.45×10<jats:sup>4</jats:sup> M<jats:sup>−1</jats:sup> and 8.65×10<jats:sup>4</jats:sup> M<jats:sup>−1</jats:sup>, respectively. The MS revealed that <jats:bold>B</jats:bold> can transform to <jats:bold>A</jats:bold> by adding more H<jats:sub>2</jats:sub>L, and <jats:bold>A</jats:bold> cannot transform to <jats:bold>B</jats:bold> in the presence of excess 1,3‐propanediamine.</jats:p>
摘要：
<jats:title>Abstract</jats:title><jats:p>Baicalin is one of the major bioactive constituents of <jats:italic>Scutellaria baicalensis Georgi</jats:italic>, possessed anti‐inflammation, antimicrobial and anticancer activity, has been attained extensive attention. In the present work, a new baicalin‐Sr(II) complex (Sr[baic]⋅3H<jats:sub>2</jats:sub>O) was synthesized to enhance its biological activity. A series of experiments were carried out to give the satisfying reaction conditions: pH=8.3 and the molar ratio of L:M ≤ 1:1. The obtained complex Sr[baic]⋅3H<jats:sub>2</jats:sub>O was characterized by IR, ES‐MS UV‐vis, atomic absorption, elemental analysis and thermogravimetric analysis. The interactions between baicalin/Sr[baic] and bovine serum albumin were also researched through fluorescence spectrum, which accord with the static quenching mechanism, Sr[baic] has higher binding ability than baicalin. Thermodynamic parameters ΔG°<0, ΔH°<0 and ΔS°>0, indicated that electrostatic forces is the major interaction forces in Sr[baic]‐bovine serum albumin system. Furthermore, the synchronous fluorescence experiments were carried out. The studies revealed that both baicalin and Sr[baic] quench the intrinsic fluorescence of bovine serum albumin, and the possible binding site is located on Trp residues. In circular dichroism spectrum, the binding of baicalin and Sr[baic] to bovine serum albumin lead to a loss in helical stability, by contrast, Sr[baic] increases baicalin's binding ability.</jats:p>
关键词：
Black shale;Leaching;Roasting;Salt addition;Vanadium
摘要：
<jats:p>In this paper, the extraction of vanadium from Chinese black shale by roasting with mixture salt addition was studied. The effect of salt additions, temperature and time on the recovery of vanadium were investigated by mixture salt roasting and 2% H<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub> leaching. The mixture additions of Na<jats:sub>2</jats:sub>CO<jats:sub>3</jats:sub>-BaSO<jats:sub>4</jats:sub> was used in the roasting process. The optimal roasting conditions for black shale were determined to be 2.5 hours roasting at 760 °C with the mixture additive SB of 10-15%. After being leached with 2% sulphuric acid, the leaching efficiency of vanadium was obtained in 85%. The pollution of waste gas was decreased in the presence of BaSO<jats:sub>4</jats:sub>-Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>.</jats:p>
作者：
Hongmei Chen;Liping Zhang;Xianzhong Cheng;Siqing Cheng;Dazhong Yan
期刊：
Asian Journal of Chemistry,2014年26(19):6579-6582 ISSN：0970-7077
通讯作者：
Chen, H.
作者机构：
[Cheng X.; Cheng S.; Chen H.; Zhang L.] School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, Hubei Province 430023, China;[Yan D.] School of Biology and Pharmaceutical Engineering, Wuhan Polytechnic University, Wuhan, Hubei Province 430023, China
通讯机构：
[Chen, H.] S;School of Chemical and Environmental Engineering, China
关键词：
Adsorption;Bamboo leaves biomass;Isotherm;Kinetics;Malachite green
摘要：
A novel method was investigated using chemically pretreated orange peel (POP) powder to separate and pre-concentrate Cr(III) in environmental water. In this study, the raw orange peel was pretreated with petroleum ether-NaOH and employed as selective sorbent for the separation of Cr(III) ions in the presence of Cr(VI). The influences of pH, sample flow rate, elution concentration and volume, and breakthrough volume were investigated in detail. Cr(III) was selectively adsorbed on the microcolumn packed with POP in the pH range from 3.5 to 5.5, while the unretained Cr(VT) was determined directly in the effluent. The retained Cr(III) was eluted with 2.0 mL of 1.2 mol L HNO3 followed by determination with ICP-MS. Under the optimum conditions, the detection limits based on 3σ criterion were 0.009 ng mL-1 and 0.037 ng mL-1 for Cr(III) and Cr(VI), respectively. The relative standard deviations (RSD) were less than 4.1% (n=11, c=2.0 ng mL-1). The proposed method was successfully applied to the speciation determination of Cr(III) and Cr(VI) in water samples. The recoveries in spiked environmental water samples ranged from 98.5% to 103.8%. A reference water sample GBW(E)080642 was also analyzed and the results were in good agreement with the certified values.
作者：
Cheng xianzhong;Hu cunjie;Tong zhongze;Hu shencai;Shao kun
作者机构：
School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, P. R. China,;Department of Materials and Chemistry Engineering, Guilin University of Technology, Guilin, P. R. Ch;Scho
摘要：
A simple,inexpensive,and sensitive method was developed for the determination of inorganic arsenic species As (Ⅲ),As(Ⅴ) and total As in environmental water samples using multiwalled carbon nanotubes (MWCNTs) as solid phase extraction(SPE) adsorbents coupled with hydride generation atomic flourescence spectrometry ( HG - AFS).The procedure is based on selectively absorbance of the chelates of As(Ⅲ) - ammonium pyrrolidine dithiocarbamate (APDC) on the MWCNTs with a pH range of 0.5 ～ 4.0,while As (Ⅴ) was passed through the microcolumn without the retention due to the preconcentration efficiency of As(Ⅴ) -APDC complex was very low and changed a litter.The retention complexs of As(Ⅲ) -APDC was eluted completely with 3 mL of 2.0 mol · L-1 HCl solution at a flow rate 1.0 mL · min - 1,and then directly determined by HG - AFS.The effluent of As(Ⅴ) was determined using thiourea and ascorbic acid as reducing agent for reduce As(Ⅴ) to As(Ⅲ).Total arsenic was determined after acid digestion with HCl∶ HNO3 (3 ∶ 1 ) in open vessel,and then the mixture solution of thiourea and ascorbic acid were added in the digestion solution for reducing As (Ⅴ) to As (Ⅲ).The different parameters that control the preconcention/separation step of As(Ⅲ) and As(Ⅴ) and determination have been investigated in detail.Under the optimized conditions,the detection limits of this method for As (Ⅲ) were 0.0062 ng · mL-1 with an enrichment factor of 27,and the relative standard deviations for As(Ⅲ) and As(Ⅴ) were 0.46％ ～ 6.30％.The proposed method was applied for the analysis of inorganic arsenic species in groundwater and lake water with the recovery of 96.8 - 102.8％.
作者机构：
[Peng Y.; Cheng X.Z.; Chen H.M.] School of chemical and environmental engineering, Wuhan Polytechnic University, Wuhan 430023, China;State Key Laboratory of Geoprocesses and Mineral Resources, China University ofGeosciences, Wuhan430074, China;[Xiao H.Y.] School of chemical and environmental engineering, Wuhan Polytechnic University, Wuhan 430023, China, State Key Laboratory of Geoprocesses and Mineral Resources, China University ofGeosciences, Wuhan430074, China
通讯机构：
[Cheng, X. Z.] S;School of chemical and environmental engineering, , Wuhan 430023, China
会议名称：
2013 International Conference on Materials for Renewable Energy and Environment, MREE 2013
摘要：
The use of low-cost and eco-friendly adsorbents has been investigated as an ideal alternative to the currentexpensive methods of removing arsenic from wastewater. Orange peel was collected from the lo
关键词：
Adsorption;Freshwater fish scale;Mercury;Removal;Wastewater
摘要：
<jats:p>The adsorption of freshwater fish scales were used to remove Hg<jats:sup>2+</jats:sup>in industrial wastewater. The effects of pH, shaking time, initial concentration on the adsorption Hg<jats:sup>2+</jats:sup>onto freshwater fish scale were investigated. In these conditions, by varying the pH of the mercury (II) solutions from 2 to 8, the removal efficiency remained higher than 96%. Optimal adsorption capacity was 117.2 mg g<jats:sup>-1</jats:sup>at pH 6.0. Characterization of the biosorbent fish scales was performed using scanning electron microscope (SEM), and Fourier transform-infrared (FTIR) spectroscopy. The mechanism for the adsorption was studied. The adsorption of Hg<jats:sup>2+</jats:sup>on to freshwater fish scale could be described by Langmuir isotherm model.</jats:p>
摘要：
A simple and rapid spectrophotometric method is described for the determination of trace zinc(II) in zinc-enriched yeast using 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) as a chromogenic reagent in the presence of surfactant OP. The analytical parameters such pH, reagent and coexistent ions were investigated. The results showed that the maximum absorption wavelength of the complex Zn-5-Br-PADAP was identified at 556 nm. The apparent molar absorptivity was 1.16 x 10(5) L mol(-1) cm(-1). Beer's law was obeyed in the concentration range of 0 similar to 12 mu g/25 mL for zinc. The interference of various ions was studied by sodium citrate and thiourea as masking agents. The proposed method has been applied to the determination of Zn in yeast-enriched samples with satisfactory and results agreed with those provided by atomic absorption spectrometry.
