The separation and recovery of copper(Ⅱ), nickel(Ⅱ), cobalt(Ⅱ), zinc(Ⅱ),and cadmium(Ⅱ) in a sulfate-based solution using a mixture of Versatic 10 acid and Mextral 984H

We studied the separation and recovery of copper(Ⅱ), nickel(Ⅱ), cobalt(Ⅱ), zinc(Ⅱ), and cadmium(Ⅱ) from magnesium and calcium, using synergistic solvent extraction(SSX) in a typical hydrometallurgical waste solution. A mixture of Versatic 10 acid and Mextral 984 H, diluted with Mextral DT100, was used to obtain fundamental data on p H and distribution isotherms, as well as the kinetics of extraction and stripping. We also investigated the main effects and interactions of common solvent extraction factors: the extraction p H at equilibrium, the temperature, and the extractant concentration. The synergistic effect for extracting metals was confirmed. The results showed that the addition of Mextral 984 H enhanced the separation factors of copper, nickel, cobalt,zinc, and cadmium over magnesium and calcium. Compared with Versatic 10 acid alone, for a mixture of0.5 mol·L~(-1) Versatic 10 acid/0.5 mol·L~(-1)Mextral 984 H, Δp H50 values of copper, nickel, cobalt, zinc, and cadmium were found to be N 2.0, 3.30, 2.85, 0.95, and 1.32 p H units, respectively. The Δp H_(50)(Zn–Mg)and Δp H_(50)(Zn–Ca)values were 3.27 and 2.25, respectively, indicating easy separation and recovery of copper, nickel, zinc, cobalt,and cadmium. The extraction and stripping of copper, cobalt, zinc, and cadmium were fast, with 90% of the metal transferred in 2 min. We next studied whether the metals could be stripped from the extracted liquid selectively in sequence, by using sulfuric acid at different concentrations. The influence of the molecular structure of the oxime and carboxylic acid components upon the synergistic effects was identified by numerical analysis.Excellent separation of copper, nickel, cobalt, and zinc over magnesium and calcium was achieved with this synergistic solvent extraction system.     

Fischer-Tropsch synthesis by reduced graphene oxide nanosheets supported cobalt catalysts: role of support and metal nanoparticle size on catalyst activity and products selectivity

In this paper,a series of cobalt catalysts supported on reduced graphene oxide(rGO)nanosheets with the loading of 5,15 and 30 wt-%were provided by the impregnation method.The activity of the prepared catalysts is evaluated in the Fischer-Tropsch synthesis(FTS).The prepared catalysts were carefully characterized by nitrogen adsorption-desorption,hydrogen chemisorption,X-ray diffraction,Fourier transform infrared spectroscopy,Raman spectroscopy,temperature programmed reduction,transmission electron microscopy,and field emission scanning electron microscopy techniques to confirm that cobalt particles were greatly dispersed on the rGO nanosheets.The results showed that with increasing the cobalt loading on the rGO support,the carbon defects are increased and as a consequence,the reduction of cobalt is decreased.The FTS activity results showed that the cobalt-time yield and turnover frequency passed from a maximum for catalyst with the Co0 average particle size of 15 nm due to the synergetic effect of cobalt reducibility and particle size.The products selectivity results indicated that the methane selectivity decreases,whereas the C5+selectivity raises with the increasing of the cobalt particle size,which can be explained by chain propagation in the primary chain growth reactions.     

New development of materials used in BFCs

Electrodes,catalysts,membranes,if present,are three main components in constructing an MFC for harvesting desired maximum power density and achieving higher coulombic efficiency (CE).Great improvements have been made,based on previous researches,in developing and diversifying materials,aside from architectures.Electrodes most familiar to us are widely used carbon materials.For anodes,carbon matrix composites(e.g.,a combination of polyaniline(PANI)with TiO2 using carbon as substrate)have gained special attention,though carbon material itself can exhibit excellent performance by diversifying molecular structures such as carbon nanotubes(CNTs).In the meanwhile,the evolution of MFC architectures,heading to the direction of improving power generation,contributes to the combination of membranes and cathodes from separate modes to diverse assemblies,on which all sorts of catalysts,such as from commonly used Pt to iron phthalocyanine (Pc),metal tetramethoxyphenylporphyrin(TMPP),MnOx,or pyrolyzed iron(Ⅱ)phthalocyanine (pyr-FePc),can be immobilized through synthesis of these catalysts with polymer such as Nafion 117 (Dupont Co.,USA)or tetrafluoroethylen(eTeflon)containing functional groups or Polypyrrol(ePPy).In addition,catholytes with aqueous cathode immersed or flowing through the surface of air-cathode are favorably proposed containing transition metal redox couples or iron chelates.     

任意可调Zn-Co合金镀层的电沉积

The effects of pulse parameters on the cobalt content, surface morphologies and grain size of Zn-Co alloy deposits were studied using a pulse plating technique with a square-wave current containing reverse pulse. Average current density and reverse anodic current density amongst the variables investigated have very strong effects on the cobalt content in the Zn-Co alloy deposits. Grain size, surface appearance and internal stress in the deposit were improved significantly by introducing the reverse current. Varieties of Zn-Co alloy compositionally modulated multilayer (CMM) coatings with large differences in cobalt contents for different sublayers were electrodeposited by designing corresponding waveforms using a computer-aided pulse plater and characterized in terms of surface morphologies. Cross-sectional morphologies of the Zn-Co alloy CMM coatings, examined using field emission gun scanning electron microscopy (FEGSEM), confirmed the layered structure.     

KINETICS OF THE EXTRACTION OF COBALT WITH EXTRACTANT P5709

The kinetics of extraction of cobalt with P5709 was studied in a Lewis cell. In the extraction system the aqueous phase was the solution of CoSO_4 (8.8×10~(-4)—3.4×10~(-2)M) and Na_2SO_4 (0.63M.) at pH 5.5; the organic phase was 15% (v/v) P5709 in kerosene (saturated with hydrogen).In order to determine the control regime of extraction of cobalt, the stirring speed, the interracial area between the two phases and the operating temperature were varied in the experiments. Experimental results showed that the extraction process of cobalt was predominantly governed by the diffusion process, and the overall mass transfer coefficients were found to be as follows:_((a)): (2-5)×10~(-3)cm/s, _((o)): (0.3-1)×10~(-3)cm/s.The results of the experiments and calculations indicated that K did not remain constant during the extraction process, Reasons for the variations in K were discussed.     

Faujasite zeolite decorated with cobalt ferrite nanoparticles for improving removal and reuse in Pb2+ ions adsorption

Water pollution caused by heavy metals ions has been gaining attention in recent years, increasing the interest in the development of methodologies for their efficient removal focusing on the adsorption process for these purposes. The current challenge faced by adsorption processes is the adequate adsorbent immobilization for removal and reuse. Thus, the present work aimed at producing a faujasite zeolite nanocomposite decorated with cobalt ferrite nanoparticles for Pb~(2+) ions adsorption in an aqueous medium improving magnetic removal and reuse.As a result, a high surface area(434.4 m~2·g~(-1)) for the nanocomposite and an 18.93 emu·g~(-1) saturation magnetization value were obtained, indicating magnetic removal in a promising material for adsorption process. The nanocomposite regeneration capacity evaluated by magnetic recovery after 24 h suspension presented a high Pb~(2+) ion adsorptive capacity(98.4%) in the first cycle. Around 98% of the Pb~(2+) ions were adsorbed in the second cycle. In this way, the synthesized faujasite:cobalt ferrite nanocomposite reveals itself as a promising alternative in adsorption processes, aiming at a synergic effect of FAU zeolite high adsorptive activity and the cobalt ferrite nanoparticles magnetic activity, allowing for adsorbent recovery from the aqueous medium via magnetic force and successive adsorptive cycles.     

2-巯基吡啶金属络合物的制备及热稳定性

制备了以2-巯基吡啶为配体的铅(Ⅱ)、钴(Ⅱ)、锰(Ⅱ)、锌(Ⅱ)、镉(Ⅱ)、铜(Ⅱ)和镍(Ⅱ)7种络合物,通过EDTA络合滴定分析、电导测定、紫外光谱和红外谱表征,确定络合物的结构。同时,利用热重分析对络合物的热稳定性进行了研究,得出其稳定性次序为:铅(Ⅱ)络合物>锌(Ⅱ)络合物>镉(Ⅱ)络合物>镍(Ⅱ)络合物>钴(Ⅱ)络合物>锰(Ⅱ)络合物>铜(Ⅱ)络合物。     

A thermally robust cobalt complex bearing quinoline-oxazoline ligand for synthesis of cis-1,4-and 1,2-polybutadienes

<正>Since the seminal discovery of highly active bis(imino) pyridine ligated cobalt and iron catalysts for ethylene polymerization,a variety of single-site late transition metal complexes have been developed and employed in olefin and diene polymerizations. However,such kind of     

FISCHER-TROPSCH SYNTHESIS OVER Fe/Ti ALLOYS

l一ltroduetlon Hydrogenation of earbon monoxide to form 11ydroearbons and aleollols 15 usually carriedout over iron and cobalt catalysts.In Germany during World War 11,cobalt eatalysts wereused to Produce some of the liquid fuels required by the country f…     

Different efficiency toward the biomimetic aerobic oxidation of benzyl alcohol in microchannel and bubble column reactors: Hydrodynamic characteristics and gas–liquid mass transfer

The selective aerobic oxidation of benzyl alcohol to benzaldehyde has attracted considerable attention because benzaldehyde is a high value-added product. The rate of this typical gas–liquid reaction is significantly affected by mass transfer. In this study, CoTPP-mediated(CoTPP: cobalt(II) mesotetraphenylporphyrin) selective benzyl alcohol oxidation with oxygen was conducted in a membrane microchannel(MMC) reactor and a bubble column(BC) reactor, respectively. We observed that 83% benzyl alcoho...     

金的高选择性浮选分离研究

研究了氯化钠和四丁基溴化铵分离金的行为及与一些金属离子分离的条件。实验结果表明,当溶液中氯化钠和四丁基溴化铵的浓度分别为2.5×10-3mol/L和4.0×10-4mol/L时,Au(Ⅲ)可与Ga(Ⅲ)、Co(Ⅱ)、Pd(Ⅱ)、Zn(Ⅱ)、Rh(Ⅲ)、Al(Ⅲ)、Cd(Ⅱ)、Ce(Ⅳ)、Fe(Ⅲ)、Ru(Ⅲ)、Cu(Ⅱ)、W(Ⅵ)、Ti(Ⅳ)、Pb(Ⅱ)、Sb(Ⅲ)、V(Ⅴ)、Pt(Ⅳ)、Mn(Ⅱ)I、n(Ⅲ)、Sn(Ⅳ)、Ni(Ⅱ)I、r(Ⅳ)和Cr(Ⅲ)离子定量分离,对合成水样中Au(Ⅲ)的分离和测定,结果满意。     

烷基双胍硫酸盐的合成及iNOS抑制活性的测定

二腈二胺在60℃下与硫酸铜反应1 5h得配合物(Ⅰ);然后分2次加入烷基胺(间隔时间为1h)于70℃(对Ⅱa、Ⅱb)或80℃(对Ⅱc～Ⅱe)下反应10h合成了5种烷基双胍硫酸盐(Ⅱa～Ⅱe),Ⅱa、Ⅱb、Ⅱc、Ⅱd、Ⅱe的收率分别为83 75%、84 21%、88 45%、87 62%、86 51%,以元素分析、IR、NMR、UV对化合物Ⅱa～Ⅱe的结构进行了确认。对化合物Ⅱa～Ⅱe及配合物(Ⅰ)的诱生型一氧化氮合酶(iNOS)抑制活性进行了测定,结果表明,化合物Ⅱb及配合物(Ⅰ)有iNOS抑制活性,其中配合物(Ⅰ)的活性强于对照物氨基胍。     

磺酸苯偶氮石墨烯材料对重金属离子的吸附性能

将4-氯苯胺-3-磺酸接枝到RGO表面,合成新型苯偶氮功能化还原氧化石墨烯材料(RGOSPA),吸附水体中的Pb(Ⅱ)、Cu(Ⅱ)、Ni(Ⅱ)、Cd(Ⅱ)和Cr(Ⅲ)。实验显示RGOSPA吸附Pb(Ⅱ)和Cu(Ⅱ)溶液的最佳p H值为5. 0,吸附Ni(Ⅱ)、Cd(Ⅱ)和Cr(Ⅲ)的最佳p H值为5. 5,对Pb(Ⅱ)、Cu(Ⅱ)、Ni(Ⅱ)、Cd(Ⅱ)和Cr(Ⅲ)的最大吸附量分别为457. 4,60. 1,63. 7,186. 2,116. 1 mg/g。吸附动力学研究表明,RGOSPA在10 min达到平衡吸附量的80%,吸附过程符合准二级动力学方程。吸附等温线研究表明,与Freundlich模型相比,Langmuir模型更适合描述吸附过程。RGOSPA通过离子交换与配位达到对重金属离子的吸附效果,可作为去除重金属离子的良好吸附剂。     

MgFe2O4@PDA@PAMAM纳米复合材料对重金属离子的选择吸附性

以快速冷却处理获得的MgFe_2O_4纳米颗粒为磁核,经多巴胺自聚合(PDA)修饰和聚酰胺-胺(PAMAM)大分子接枝,制备高磁性MgFe_2O_4@PDA@PAMAM纳米复合材料,考察了MgFe_2O_4@PDA@PAMAM纳米复合材料对中性水溶液中Cu(Ⅱ)、Pb(Ⅱ)、Cd(Ⅱ)和Hg(Ⅱ) 4种重金属的吸附性能。结果表明:通过快速冷却的处理方式改变MgFe_2O_4晶粒内的金属离子分布,可获得具有高饱和磁化强度的MgFe_2O_4纳米材料;所制备的MgFe_2O_4@PDA@PAMAM纳米复合材料对4种重金属离子具有高的吸附能力,其中对Cu(Ⅱ)、Pb(Ⅱ)、Cd(Ⅱ)和Hg(Ⅱ)的饱和吸附容量分别为108.32、179.54、50.24和39.6 mg/g,选择吸附性顺序从高到低依次为Pb(Ⅱ)、Cu(Ⅱ)、Cd(Ⅱ)、Hg(Ⅱ)。     

新水溶性卟啉试剂的合成及其与金属离子显色反应的研究

五种新的水溶性卤代苯磺酸卟啉化合物的合成和分离纯化方法。新卟啉试剂与 Cu(Ⅱ)、Zn(Ⅱ)、Pd(Ⅱ)、Ni(Ⅱ)、Co(Ⅱ)、Mn(Ⅱ)、Cd(Ⅱ)、Pb(Ⅱ)八种金属离子的显色反应。试剂结构的改变及各种取代基对试剂以及试剂与金属离子反应性能的影响。     

高介电聚氨酯基复合材料的制备与性能研究

以聚氨酯弹性体(Polyurethane Elastomers,PUE)为基体,以具有高介电常数的铜酞菁齐聚物(Copper phthalocyanine oligomer,CuPc)为填料,并且为改善两者的相容性,通过化学方法将部分CuPc接枝到聚合物链上,制备了具有高介电常数的聚合物基纳米复合材料。在100Hz时,CuPc含量为15wt%的纳米复合材料的介电常数高达440左右,是PUE与CuPc简单共混物的8倍多。介电常数的迅速提高归功于CuPc粒子在纳米复合材料中分散性的改善与粒径的大大减小导致的复合体系中界面交换耦合效应的显著增加。     

金属卟啉配合物与吡啶轴向配位反应的光度法研究

用光度法测定了 Co(Ⅱ)、Ni(Ⅱ)、Cu(Ⅱ)、Zn(Ⅱ)、Cd(Ⅱ)的原卟啉 IX 二甲酯配合物与吡啶轴向配位反应的化学平衡常数及产物分子的组成比,并对实验结果进行了理论解释。     

3-甲醛肟基苯甲酸乙酯的合成及其对部分重金属离子的荧光选择识别

基于肟类化合物对重金属离子具有很好的配位能力,是一类制备荧光探针的优良配体。将3-溴苯甲酸与二氯亚砜在乙醇中直接反应制得中间体3-溴苯甲酸乙酯(L2)。接着将中间体L2与氰化亚铜直接反应得到中间体3-氰基苯甲酸乙酯(L3),最后将中间体L3与盐酸羟胺在碳酸钠存在下制得标题化合物L4。对化合物L2～L4进行核磁共振氢谱、碳谱和红外光谱等结构表征。利用电子吸收光谱和荧光光谱研究了常见重金属离子(Cu(Ⅱ)、Fe(Ⅲ)、Pb(Ⅱ)、Co(Ⅱ)、Cr(Ⅲ)、Ni(Ⅱ)、Fe(Ⅱ)、Mn(Ⅱ)、Zn(Ⅱ)和Cd(Ⅱ))对目标化合物L4的选择性,研究表明目标化合物对Cu(Ⅱ)、Fe(Ⅲ)和Pb(Ⅱ)离子表现优良的选择作用。随着金属离子Cu(Ⅱ)、Fe(Ⅲ)和Pb(Ⅱ)的加入,目标化合物L4的荧光强度均逐渐减弱至基本完全猝灭,而对其他重金属离子没有选择识别作用或选择识别作用较弱。     

Cu(Ⅱ)、 Ni (Ⅱ)、Pb(Ⅱ)共存与 pH 对吸附影响的响应面研究

研究了羧甲基壳聚糖改性后的高岭土原矿吸附重金属时,pH 和溶液中 Cu(Ⅱ)、 Ni (Ⅱ)、Pb (Ⅱ)竞争吸附对吸附效果的影响.采用通用旋转组合设计(CCD)实验方案,以各自的吸附率为响应值,建立了三元多项式方程,模型相关系数均超过0.95,表明模型显著.实验结果显示金属离子吸附随 pH 的增大而增大,离子间的相互影响最好在 pH=4.0~5.0的范围内研究,以消除所有金属可能产生的沉淀.单一金属的吸附顺序为 Pb(Ⅱ)>Cu(Ⅱ)>Ni(Ⅱ).对两种金属离子共存的分析表明,Ni(Ⅱ)在与 Cu(Ⅱ)或 Pb(Ⅱ)共存时,吸附效果增强;Pb(Ⅱ)的吸附则受 Ni(Ⅱ)和 Cu(Ⅱ)的抑制.Cu(Ⅱ)吸附较复杂,pH 增大后, Cu(Ⅱ)吸附受 Pb(Ⅱ)的抑制;Cu(Ⅱ)初始浓度越高,Ni(Ⅱ)对其吸附的促进作用越明显.     

碘化钾-甲基绿-水液-固体系分离汞(Ⅱ)的研究

研究了碘化钾-甲基绿-水液-固体系分离汞(Ⅱ)的行为及其与常见离子分离的条件。结果表明,控制pH7.0,当0.1mol/L碘化钾溶液和1.0×10-3mol/L甲基绿溶液的用量均为0.5 mL,时,Hg(Ⅱ)能与I-、MG+形成(MG)2(HgI4)沉淀,而Zn(Ⅱ)、Cd(Ⅱ)、Cu(Ⅱ)、Mn(Ⅱ)、Co(Ⅱ)、Ni(Ⅱ)、Fe(Ⅱ)、Al(Ⅲ)等在此条件下不形成沉淀,实现了Hg(Ⅱ)与这些常见离子之间的定量分离对合成水样进行了定量分离测定,结果满意。