A CTAB-assisted hydrothermal synthesis of VO2(B) nanostructures for lithium-ion battery application

Nanostructured VO₂(B) was synthesized via a combined hydrothermal method using V₂O₅ as a source material and oxalic acid powder as a reductant. Especially, cetyltrimethylammonium bromide (CTAB) was used as template and then three different morphologies of the VO₂(B): nanobelts, nanoflowers and nanoflakes were obtained through the change of the experimental conditions. The morphology and crystalline structure of the prepared products were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). Furthermore, the electrochemical charge–discharge cycling properties of the VO₂(B) nanostructures in lithium-ion battery were investigated. The results indicated that the belt-like, flower-like and flake-like VO₂(B) nanostructures have the initial specific discharge capacity of 205.2, 254.0 and 56.0 mA h g⁻¹, and that the morphology of VO₂(B) nanostructures can deeply affect the service performance of batteries. According to the experiments, this CTAB-assisted hydrothermal method provides an insight into the preparation and application of nanostructured VO₂(B) as cathode material in lithium-ion battery.     

The effect of amorphous chalcogenides on mechanical and anticorrosive properties of protective organic coatings containing high amounts of zinc metal particles

The objective of this paper concerns reduction of zinc metal content in organic coatings while preserving their high anticorrosive efficiency. The two goals can be achieved by using amorphous chalcogenides as components of the protective coating. Special attention was paid to materials containing Ge₂₀Se₈₀, Ge₃₀Se₇₀ and Ge₄₀Se₆₀, which were characterized by physico-chemical properties. An epoxy ester resin was used as binder for the investigated organic coatings. Organic coatings were prepared by combining zinc metal with amorphous chalcogenides. The resistance of the prepared films was evaluated using the results of mechanical tests. The anticorrosive efficiency of the prepared films was evaluated using the results of direct corrosion tests. Thus the following conclusion can be made from the results of anti-corrosive tests: the higher the pigment volume concentration of amorphous chalcogenides in the coatings, the higher the protective performance of the paint against corrosion.     

脱水污泥吸附去除废水中钼污染物的研究

运用脱水污泥研究了吸附去除含钼废水中钼染污物。研究结果表明：pH 3~4,吸附时间为3 0 min,投加量为1 g,温度为30℃时为最佳吸附条件,去除率可达88.5%以上。吸附机理研究结论表明,吸附机制为表面络合反应。     

四甲基氢氧化铵的提纯实验研究

通过单因素实验考察了四甲基氢氧化铵的电解工艺。以钛基镀铱板为阳极,不锈钢为阴极,在电解槽中恒电流密度电解提纯四甲基氢氧化铵,主要考察了电解工艺中离子交换膜种类、原料浓度、电解温度和电流密度对电流效率的影响。当采用上海上化水处理厂3361为阳离子交换膜,在原料室四甲基氢氧化铵浓度25%、电解液温度50℃、电流密度8 ASD(A/dm2)时,电流效率可达66.74%,产品中金属离子杂质总含量从25×10-6降至0.8×10-6,氯离子浓度从0.65×10-6降至0.01×10-6。采用等离子体发射光谱仪(ICP-AES)、分光光度计对产品四甲基氢氧化铵进行表征。     

Synthesis,structural and optical properties of ZnS,CdS and HgS nanoparticles from dithiocarbamato single molecule precursors

Dithiocarbamate complexes of Zn(II), Cd(II) and Hg(II) were synthesize and characterized by elemental analysis, thermogravimetric analysis, UV–Vis, FTIR, ¹H- and ¹³C-NMR spectroscopy. The complexes were thermolyzed at 180°C to prepare HDA-capped ZnS, CdS and HgS nanoparticles. The optical properties of the nanoparticles showed absorptions that are blue shifted with respect to the bulk and narrow emissions. The ZnS nanoparticles are in the cubic phase with average crystallite sizes of 3–5 nm. The CdS nanoparticles consist of a mixture of cubic and hexagonal phases with particle sizes of 8–22 nm, while the HgS nanoparticles are in the cubic phase with average crystallite sizes of 7–14 nm.     

BaTiO3基多层陶瓷电容器抗还原介质材料的研究进展

多层陶瓷电容器(MLCC)是一类重要的片式元器件,内电极的贱金属化已成为其产品开发的主流。MLCC内电极贱金属化的关键技术是获得抗还原性能优异的瓷料,能够与贱金属镍电极实现共烧的BaTiO3基抗还原瓷料的研究是目前MLCC研究的热点。本文综述了BaTiO3基抗还原介质材料的抗还原机理、制备方法及研究进展。     

分子印迹吸附剂对红景天水煎液中重金属的吸附

采用分子印迹技术,以Pb（Ⅱ）为印迹离子制备了铅印迹壳聚糖包覆硅藻土微球（PbCSDE）。研究了PbCSDE对红景天水煎液中重金属Pb（Ⅱ）、Cu（Ⅱ）的吸附,考察了吸附时间、溶液pH对吸附的影响。与732商业树脂比较,铅印迹壳聚糖包覆硅藻土微球（PbCSDE）对红景天水煎液中Pb（Ⅱ）、Cu（Ⅱ）的吸附能力提高了2倍多。紫外光谱和高效液相色谱分析表明,经PbCSDE吸附后,红景天水煎液中的活性成分红景天苷没有发生改变。     

重金属废水处理方法研究进展

随着我国经济的快速发展,工业废水大量排放,使得水体重金属污染日益严重,而重金属同时又是重要的资源,如何将其从水体中分离回收,是当前环境保护领域研究的热点之一。目前,水体重金属污染的处理方法主要有化学法、物理法和生物法。本文综述了近年来重金属废水处理方法的研究进展,并对该类研究进行了展望。     

MFE乙烯基酯树脂在防腐蚀领域的应用

本文主要介绍了MFE乙烯基酯树脂在化工、电子、钢铁、有色金属及轻工造纸等行业防腐方面的应用，并列举了许多华东理工大学华昌聚合物有限公司生产的MFE乙烯基酯树脂的应用实例。     

Neutral Pd(II) and Ni(II) Acetylide Initiators for Polymerization of (Dimethylamino)ethyl Methacrylate

A series of air-stable, late transition, metal-based initiators with the structures ML₂(CCR)₂ (M=Pd and Ni; L=PPh₃ and Pn-Bu₃; R=Ph and CH₂OH) for the polymerization of (dimethylamino)ethyl methylate (DMAEMA) were developed. Transition metal, phosphine, alkynyl, as well as solvents exhibited significant influence on the polymerization. Among them, Pd(CCPh)₂(PPh₃)₂ (PPP) shows the highest activity in CHCl₃ for DMAEMA polymerization. The PDMAEMA obtained is a syndiotactic polymer with high number-average molecular weight (M_n) of 20.2 × 10⁴. A free radical polymerization mechanism with some ATRP characteristics was proposed for the present polymerization.