共查询到20条相似文献,搜索用时 62 毫秒
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为实现混合溶液中Ni(II)与Co(II)的分离,设计了电渗析与萃取耦合的集成分离技术,借助自行设计的设备,在选P507为萃取剂后,考察了电流密度、酸用量、体积流量、萃取剂皂化率、原料与萃取剂摩尔比、萃取方式等对分离效果的影响.结果表明:在实验范围内,电流密度3.8 mA/cm2,酸用量为理论用量的1.3倍,体积流量60 L/h、皂化率60%,原料与萃取剂摩尔比1:1.7为优取的操作条件;料液循环重复萃取,能显著提高分离效果.由此表明,电渗析与萃取耦合的分离技术,可分离混合体系中的Ni(II)、Co(II),且无需溶剂参与. 相似文献
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Samir S. Kandil Naeema H.M. Yarkandi Suhair M.S. Jambi 《Journal of Sulfur Chemistry》2014,35(1):98-105
Coordination complexes of formula [ML2], [CoL3], [Pd(HL)Cl2], [CuLCl(H2O)] and [CuL2(H2O)2] {L=anion of N-ethyl-N′-(4′-methylthiazol-2′-yl)thiourea; M=PtII, PdII or NiII} were prepared and characterized by elemental analyses, magnetic susceptibilities, and by IR, NMR, electronic and mass spectral measurements. 相似文献
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传统的净化方法难以实现低成本、高效、选择性净化含磷化氢尾气,这限制了含磷化氢尾气的资源化技术的实现.文章利用自主筛选的催化剂,在实验室进行了Pd2 浓度、Cu2 浓度、反应温度、混和气氧体积分数、磷化氢质量浓度、混合气流速等因素对Pd(II)-Cu(II)水溶液净化含磷化氢气体影响的研究.实验结果表明,Pd(II)-Cu(II)催化剂在低温(22-73 ℃)、常压下(100 kPa)对质量浓度为850 mg/m3磷化氢气体净化效率可高达100%.并且催化剂稳定性随催化氧化反应温度的升高而降低,随被净化混和气中氧体积分数、吸收液中Pd2 浓度及Cu2 浓度增大而增强;催化氧化净化效率随混和气中磷化氢质量浓度升高而降低,随被净化的混和气流速降低而升高. 相似文献
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Güneş Süheyla Kürkçüoğlu Tuncer Hökelek Mehran Aksel Okan Zafer Yeşilel Hakan Dal 《Journal of Inorganic and Organometallic Polymers and Materials》2011,21(3):602-610
Three new complexes [M(deten)2Ni(μ-CN)2(CN)2]
n
(M = Ni, Cu and Cd, deten = N,N-diethylethylenediamine) have been synthesized and characterized by chemical, thermal analysis, FT-IR and Raman spectroscopies.
The crystal structure of the Cd complex has been determined by X-ray single crystal diffraction. Structural study reveals
that the Ni2+ and Cd2+ ions are located on inversion centers, and adopt slightly distorted square-planar and octahedral geometries, respectively.
In the crystal structure, the intermolecular N–H⋯N hydrogen bonds link the polymeric chains into a two dimensional network.
Vibrational spectral data indicate the presence of two ν(C≡N) for complexes can be assigned to the terminal and bridging cyanides.
The decomposition reaction take places in the temperature range 30–1000 °C in the static air atmosphere. 相似文献
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Ai-Hong Yang Hong Zhang Ping Yin Hong-Ling Gao Jian-Zhong Cui Bin Ding 《Inorganic chemistry communications》2010,13(11):1304-1308
Four novel 3D coordination polymers, {[K3Cu2(H0.5pdtc)2 (H2O)6]·(H2O)2}n (1), {[trans-K2Mn3(pdtc)2 (H2O)11]·H2O}n (2), {[trans-K2Mn3(pdtc)2 (H2O)10]·H2O}n (3) and {[cis-K2Cu2Mn(pdtc)2 (H2O)10]·H2O}n (4), were synthesized by the self-assembly of potassium pyridine-2,3,5,6-tetracarboxylate (K4pdtc) with metal salts. All of them contain infinite 1D stepwise chain. Notably, 2–4 have 2D network structures depending on the trans- and cis- hexacoordinated Mn(II) acting as connecters between the chains. Then, they further assemble into 3D or twin-plane structures by K(I) ions. 4 is the first Cu/Mn/K heterotrimetallic complex with H4pdtc. The (H2O)6 clusters in 1 arranged stepwise along the complex chains owing to the host chains' template effect. The variable–temperature magnetic measurements reveal that weak antiferromagnetic interactions exist in complexes 1 and 4. 相似文献
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Ting Chen Yang Zou Chaoyong Yu Xiaojun Zhou Yuanyuan Li 《Journal of Inorganic and Organometallic Polymers and Materials》2012,22(5):1200-1205
A heteronuclear complex of [Mn(H2O)4(CuL)2]2·4H2O 1 (H2L = 2-hydrogen benzaldehydeneglycylglycine) has been synthesized and characterized by IR spectra, TGA, and single crystal X-ray diffraction analysis. The molecule consists of one $\text{Mn}{(\text{H}_{2}\text{O})_{4}}^{2+}$ Mn(H2O) 4 2+ group and two symmetric groups [CuL]? which are connected by carboxylate oxygen atoms. A discrete water hexamer composed of a planar tetrameric water ring and two pendent water molecules acts as a ‘glue’ to assemble adjacent [CuL]? into a two-dimensional structure. 相似文献
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《分离科学与技术》2012,47(8):1635-1643
Abstract This investigation examines metal ion adsorption on mesoporous silicate, MCM‐41, synthesized from sodium silicate solution and cethyltrimethylammonium bromide (CTAB). MCM‐41 has potential as an adsorbent material, with a regular hexagonal pore structure, large specific surface area, and large pore volume. The MCM‐41 synthesized for this investigation is characterized using powder X‐ray diffraction and nitrogen adsorption and desorption isotherms data. The adsorption behavior for cadmium(II) and lead(II) onto MCM‐41 was studied by contacting the mesoporous silicate with an aqueous solution of metal salts and acetylacetone. Both Cd2+ and Pb2+ were found to quantitatively adsorb onto MCM‐41. The results of this study suggest that MCM‐41 may have applications in the recovery of toxic metals from waste waters. 相似文献
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《Inorganic chemistry communications》2003,6(8):996-1000
The water-soluble RuII acetylacetonato–sulfoxide complexes, cis-Ru(acac)2(DMSO)2 (1) and Ru(acac)2(meso-BESE) (2), were synthesized (BESE=1,2-bis(ethylsulfinyl)ethane=EtS(O)(CH2)2S(O)Et). Both complexes were characterized by 1H and 13C{1H} NMR, UV–Vis, and IR spectroscopies, as well as MS, elemental analysis, solution conductivity, and cyclic voltammetry, while the molecular structure of 2 was determined also by X-ray crystallography. All sulfoxide ligands are S-bonded. The complexes were tested against human breast cancer cells (MDA-MB-435S) using an in vitro MTT assay, a colorimetric determination of cell viability; IC50 values of >2000 and 1500 ± 100 μM were determined for 1 and 2, respectively, while cisplatin exhibits an IC50 value of 30 ± 5 μM. 相似文献
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Xiuling Zhang Baoyong Zhu Yulan Song Feng Guo Yongliang Liu 《Journal of Inorganic and Organometallic Polymers and Materials》2011,21(3):711-717
Three new coordination polymers [Cd(L)(4,4′-bipy)0.5]n (1), {[Mn(L)(bpp)]·H2O}n (2) and [Ni(L)(2,2′-bipy)(H2O)2]n(3) [H2L = Benzopenone-2,4′-dicarboxylic acid, 4,4′-bipy = 4,4′-bipy ridine, bpp = 1,3-di(4-pyridyl) propane and 2,2′-bipy = 2,2′-bipyridine]
have been synthesized and structurally characterized by elemental analysis, IR and X-ray diffraction. Single-crystal X-ray
analyses revealed that the H2L ligand acts as a bridge, exhibiting three coordination modes to link metal ion: bidentate chelating, bis-monodentate, monodentate. Compound 1 has 3-connected metal–organic framework with the (63) topology notation; Compounds 2 and 3 are one-dimensional chain structures. The luminescent properties for compound 1 was investigated. 相似文献
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In this study, we reported an efficient, alternative, and low-cost adsorbent for the efficient removal of Pb(II), Zn(II), Cd(II) and Cu(II) from water. The new hybrid material has been prepared by immobilizing a conjugated system (2Z)-1-(1,5-dimethyl-1H-pyrazol-3-yl)-3-hydroxybut-2-en-1-one on silica gel previously doped with 3-aminopropyltrimethoxysilane. The formed surface (SiNPz) was perfectly analyzed. Adsorption studies have demonstrated the ability to highlight the surface designed for efficient removal of above toxic metals from aqueous solutions using FAAS. The new material was used for the extraction of metals from natural water and showed efficiency results for toxic heavy metals. 相似文献
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Purification of commercial phosphoric acid produced by the wet process from toxic heavy metals such as zinc and manganese is considered to be a very important environmental and economical process. The commercial bis(2,4,4‐trimethylpentyl)‐ phosphinic acid (Cyanex‐272) is proposed as an extractant for the efficient removal of Zn(II) and Mn(II) from crude phosphoric acid samples of concentrations of 25% and 45%. Various parameters affecting the extraction rate of Zn(II) and Mn(II) were investigated. The results were assessed to obtain the optimum conditions for the fast and efficient removal of both cations from crude phosphoric acid using Cyanex‐272 as an extractant in various diluents. The selectivity sequence of different diluents for Zn(II) and Mn(II) extraction were: kerosene > n‐hexane > cyclohexane > toluene > benzene > chloroform. The stripping of the investigated metal ions is efficiently performed with ammonium thiocyanate which has been selected as a suitable stripping agent. 相似文献
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在无水乙醇溶液中,用木犀草素和醋酸铜、醋酸锌合成两种鲜见报道的木犀草素金属配合物,并通过元素分析、红外光谱、电子光谱和摩尔电导等表征手段,确定了配合物的结构。并研究了木犀草素Zn(II)和木犀草素Cu(II)配合物化学修饰碳糊电极在pH 5 B-R缓冲溶液中的电化学行为。 相似文献
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采用回流-沉淀聚合制备了含磺酸钠聚合物微凝胶(SSPMg),通过扫描电子显微镜(SEM)、比表面及孔隙度分析(BET)、傅里叶变换红外光谱(FTIR)、X射线光电子能谱(XPS)等对其结构性能和化学组成进行了表征,并考察了SSPMg对Cu(II)和Pb(II)的吸附性能。结果表明,对苯乙烯磺酸钠占共聚单体总质量17.5%的微凝胶(SSPMg-4)在pH值=5时吸附效果最佳;吸附过程更符合准二级动力学和Langmuir等温吸附模型,以单分子层的化学吸附为主,包括络合、离子交换和静电吸附作用;吸附过程ΔG小于0、ΔH大于0,表现为常温下的自发吸热过程。298.15 K时,SSPMg-4对Cu(II)和Pb(II)的Langmuir理论最大吸附量分别达523.56 mg/g和568.18 mg/g。经过6次循环使用后,SSPMg-4对Cu(II)和Pb(II)的去除率保持在初始去除率的92%以上。 相似文献
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Pseudo-emulsion-based hollow-fiber strip dispersion (PEHFSD) technique was examined as an alternative to solvent extraction for simultaneous separation and concentration of cobalt(II)–nickel(II) mixture using Cyanex-272 as the extractant. Experiments were carried out by continuous recirculation of the feed and pseudo-emulsion phases through a hollow-fiber module. The separation factor increased rapidly after 60 min of operation. The maximum value after 120 min of operation was ~128 (pH = 6.5) for the operating conditions studied. The mass transfer resistance from the extraction reaction appeared to be dominant. The results of mathematical modeling of the mass transfer process indicated that higher separation factor and extraction rate can be achieved using PEHFSD in comparison to solvent extraction. Mixing of the stripping and the feed solution was observed at high dispersed phase volume fraction in the pseudo-emulsion and low flow rate of this phase. The maximum value of backtransport flux from the stripping phase due to mixing was estimated to be approximately two orders lower than the initial extraction rates. 相似文献
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对选择性絮凝的现有方法按照其特点进行了系统的分类,从吸附角度和动力角度两个大方面考虑选择性絮凝的方法。吸附角度又包括增减颗粒上的活性质点数、絮凝剂分子量、絮凝剂用量、分子识别和絮凝剂形态五个方面。文中的分类方式基本涵盖了所有的选择性絮凝方法,并对选择性絮凝方法的机理和分类规律进行了阐述。这里着重介绍除增减颗粒活性质点数外的其他方法,同时,根据选择性絮凝分类方法的规律,首次提出了几种新方法并进行了探索性论述,如用合适的剪切力提高絮凝的选择性等。 相似文献
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First macrocyclic oxamide Cu(II)–Co(II) complex: synthesis,crystal structure and magnetic properties
《Inorganic chemistry communications》2002,5(11):1012-1015
A oxamido-bridged binuclear complex, [Cu(L)Co(bpy)2](ClO4)2·0.5C2H5OH·H2O has been synthesized, and structurally and magnetically characterized, where L = 1,4,8,11- tetraazacyclotradecanne-2,3-dione and bpy = 2,2′-bipyridine. In the complex, the copper atom from the macrocyclic oxamido-copper(II) precursor in a square-planar and cobalt atoms in a distorted octahedral environment is bridged by the oxamidate group, Cu⋯Co separation of 5.359 Å. The metal–metal separations are consistent with the sequence of decrease of the ion radius of the metal ion. The magnetic properties of the complex have been investigated. The χMT versus T plots is typical of antiferromagnetically coupled Cu(II)–Co(II). 相似文献
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《溶剂提取与离子交换》2013,31(6):1059-1071
The extraction behaviour of cobalt(II) and nickel(II) from sulfate solutions with bis(2-ethylhexyl) phosphinic acid (PIA-8) in toluene has been studied. Quantitative extraction of Co(II) was observed at pH 5.0–5.9 while that of Ni(II) at pH 6.8–7.0 with 0.03 M PIA-8 in toluene. The difference in pH0.5 for Co(II) and Ni(II) was 1.9. The stoichiometry of the extracted species were determined by slope analysis method. The extraction reaction proceeds by cation exchange mechanism and the extracted species were Co · R2(HR)2 and Ni · R2 · 2(HR)2. Temperature dependance of the extraction equilibrium constants were determined to estimate the apparent thermodynamic functions (ΔG, ΔS and ΔH). The method was used for separation of cobalt(II) and nickel(II). Cobalt(II) was separated from nickel even at 1:20 (Co:Ni) ratio. The separation of cobalt(II) from nickel(II) was favoured with the increase in temperature. 相似文献