Stoichiometry and Stability Constant Values for Copper (II) Chelates with Ethylene Diamine in Deep Eutectic Solvents (DES) (Ethaline) Solutions

In this study we used the deep eutectic solvents (ionic liquids) to investigate the reaction between copper (II) with ethylene diamine (en). Two of the existing methods for analyzing spectrophotometric measurements have been applied for establishing, the stoichiometry and whenever possible, the stability constants of the chelates formed. The method of continuous variations was necessary to determine first whether, the metal ion and the ligand ethylene diamine form one or more than one chelate, when more than one chelate formed, the results obtained depend on the wavelength and for meaningful conclusions the wavelengths were carefully selected. The empirical formulae of the chelates were further substantiated by the molar ratio method. The effect of time and temperature on the formation and stability of these chelates in solution is also studied. The stability constants, K1 and K2 for the copper (II) chelates were calculated, though reliable, and are comparable to literature values.

Synthesis of 2-methylpyrazine from cyclocondensation of ethylene diamine and propylene glycol over promoted copper catalyst

The 2-methylpyrazine was synthesized by catalytic reaction of ethylene diamine and propylene glycol at 380 ℃. The alumina supported copper catalysts with promoter were prepared by impregnation method, characterized by ICP-AES, BET and TPR. The results demonstrated that the dehydrogenation was improved by addition of chromium promoter. The selectivity of 2-methylpyrazine reached 84.75%, while the conversions of reactants were also enhanced.

Synthesis and dehydrogenation properties of NaZn(BH4)3·en and NaZn(BH4)3·2en(en= ethylene diamine)

Two new hydrogen storage compounds,Na Zn(BH4)3·en and Na Zn(BH4)3·2en(en=ethylene diamine)are synthesized by a solution method.They can release 6.4 wt%and 6.3 wt%pure hydrogen below 200℃,respectively,demonstrating the potential to be used as hydrogen carriers.Additionally,their dehydrogenation products,thermodynamics and kinetics are well characterized and analyzed.Results shows that the stronger Zn-N interactions and the Hδ+–Hδ-interactions are significant for their stability below 100℃,relatively low decomposition temperatures and elimination of gas impurities.

Synthesis, Crystal Structure and Thermal Properties of N,N′-Bis(5,5-dimethyl-2-phospha-2-thio-1,3-dioxan-2-yl) Ethylene Diamine

The title compound N,N＇-bis（5,5-dimethyl-2-phospha-2-thio-1,3-dioxan-2-yl） ethylene diamine （DPTDEDA, C12H26N2O4P2S2） was synthesized by the reaction of neopentyl glycol, phosphorus thio-chloride and 1,2-ethylenediamine, and characterized by elemental analysis, IR and ^1H NMR spectra. Its crystal structure was determined by single-crystal X-ray diffraction analysis and the thermal property was analyzed by TG analysis. The crystal structure belongs to monoclinic, space group P21/c, with a = 14.557（16）, b = 11.299（12）, c = 12.163（13）A,β = 98.707（19）^o, Dc = 1.305 g/cm^3, Z = 4, γ = 0.71073A,μ（MoKa） = 0.447 mm^-1, Mr = 388.41, V = 1977（4）A3, F（000） = 824, S = 1.107, the final R = 0.0478 and wR = 0.0810 for 1738 observed reflections （I 〉 2σ（I））. X-ray analysis reveals that the crystal structure is centrosymmetrically distributed through 1,2-ethylenediamine to join two distorted six-membered rings. The weak N-H…S interactions are observed and link the molecules into sheets. TG analysis shows that the title compound has good thermal stability and char-forming capability, which are required for an excellent intumescent fire retardant.

Synthesis and Characterization of Trivalent Al Substituted Zinc Ferrite using Ethylene Diamine (EDA) as Ligand

Nano domain Al substituted Zinc ferrite was prepared by chemical route using Ethylene Diamine as ligand.High purity precursors nitrate salts of Zinc,Fe(3+),Al(3+)were utilized along with citric acid which acts as both fuel and complexing agent.Two different molar ratios of Zn(2+):(Fe3+):Al(3+)is 1:1.5:0.5 and 1:1.25:0.75.After ensuring proper mix of the solution Ethylene diamine was added dropwise to form a gel like mass with proper pH control.Before annealing,thermal analysis was carried to determine the crystallization/phase transition zone.Drying was carried in several stages.Initially,gel like mass was obtained after drying at 40°C while pH was about 7.Drying of gel was carried in oil bath at about 90°C and powdered mass obtained was grinded followed by auto combustion at 150°C for 60 minutes before annealing at 150°C,350°C,650°C,950°C for 2 hours to ensure the phase formation.Crystallite size,lattice strain and lattice parameters were studied from XRD analysis.

Ethylenediaminetetraacetic Acid Chelation for Band Keratopathy before Ab Interno Glaucoma Surgery

An 87-year-old woman with primary open-angle glaucoma presented to our hospital. Although the combined cataract and minimally invasive glaucoma surgeries (MIGS) were an appropriate surgical option, the presence of band keratopathy made it difficult to perform ab interno glaucoma surgery in her right eye (OD);therefore, the corneal opacity was removed using ethylenediaminetetraacetic acid (EDTA) chelation procedure. One month after chelation, microhook ab interno trabeculotomy and cataract surgery were performed successfully. Clear intraoperative visualization of the angle structures is critical for the success of these MIGS procedures. In glaucomatous eyes that require MIGS, EDTA chelation is a good neoadjuvant therapy for coexisting band keratopathy.

架桥剂配比对PET/EN-MFMB的化学结构及力学性能的影响

用环氧化合物与助反应剂配比不同的EN型多功能母料(EN-MFMB)制得了不同的PET/EN-MFMB增体系,研究了两种架桥剂配比对PET/EN-MFMB的化学结构及力学性能的影响。结果表明,随着环氧化合物比例增加,PET/EN-MFMB中反应了的PET、PE、弹性体的比例提高;以环氧化合物与助反应剂4∶6的配比制的EN-MFMB增韧PET的效果最好,制得的PET/EN-MFMB中弹性体质量分数为7%时综合力学性能最佳:悬臂梁缺口冲击强度提高到原料PET的4.54倍,拉伸屈服应力和弯曲弹性模量分别为原料PET的103%和99%。

PET／EN-MFMB增韧体系非等温结晶及熔融行为

用差热分析法研究了PET／EN-MFMB增韧体系逐渐升温和逐渐降温的结晶行为以及逐渐升温的熔融行为。结果表明:PET／EN-MFMB增韧体系中PET冷、热结晶开始结晶温度均比原料PET的有所降低,热结晶成核速率均比原料PET的有明显提高。HDPE的结晶过程受到了PET的阻隔、约束作用。PET结晶开始熔融温度一般都比原料PET 有所提高;HDPE结晶熔融峰顶温度比原料HDPE以及EN-MFMB中的HDPE的明显降低。

[Zn(en)_3]SO_4配合物大尺寸单晶的水热法生长和表征

Large size single crystals of SO4have been successfully grown by a hydrothermalprocess at 160℃for 24h, using CuSO4·5H2O, ethylene diamine and reductive Zn powder as reactants. The diameters of the single crystals are range from 0.5mm to 1mm, and lengths reach up to 20mm. The single crystals were characterized by XRD analysis, FTIR and UV Vis spectrum absorption measurements. The single crystal was confirmed to beSO4 by performing powder diffraction of the single crystal. X ray diffraction of the single crystals shows (100) face to be cleavage face. The diffraction peaks are sharp and rockingcurve for 200 diffraction has a narrow FWHM (the full width at half maximum), which indicate the single crystal of SO4 is perfect with less lattice distortion and defects. The single crystal appears transparent,and has constant weak absorption in UV Vis spectrum region,whichcould be used as a novel optical crystal material.

高韧PECF共聚酯制备及结构性能研究

针对聚呋喃二甲酸乙二醇酯(PEF)韧性差、脆性大的难题,采用化学共聚将1,4-环己烷二甲醇(CHDM)单体引入PEF并成功制备了高韧共聚酯。系统研究了CHDM含量对共聚酯结构性能的影响,结果显示:共聚酯均为无规共聚酯,数均相对分子质量为17 806~23 654 g/mol,分子质量分布为2.0~2.6,特性黏度为0.69~0.75 d L/g。随着CHDM含量增加,共聚酯出现了新晶体结构且各晶面间距和晶粒尺寸有所降低,结晶度从20.29%增至39.13%,表明CHDM可有效提升共聚酯的结晶能力,同时共聚酯具有良好的热稳定性。共聚酯力学性能呈现先增加后下降趋势,当CHDM质量分数为60%时,共聚酯拉伸强度为56.2 MPa,断裂伸长率为188.2%。综上,化学共聚可有效调控共聚酯分子链组成与晶体结构,进一步可制备高韧性共聚酯材料。

基于硫化钠的垃圾焚烧飞灰EDTA提取液中重金属回收试验研究

为实现对垃圾焚烧飞灰EDTA提取液中重金属的回收,以硫化钠溶液为沉淀剂,探究了其用量对重金属回收率的影响,并评价了回收后重金属对环境的影响。理论计算结果表明,在pH为9~12的体系中,S^(2-)能与提取液中的重金属离子形成CdS、CuS、PbS、ZnS金属硫化物沉淀。回收试验结果表明,每处理1 L提取液,5%Na_(2)S的适宜用量为40 mL,Na_(2)S用量对各重金属元素的回收率总体上影响不大;提取液处理前,Cd、Cu、Zn和Cr的质量浓度较低,Cd、Pb质量浓度超标,尤其是Pb超出了标准限值的20倍;回收处理后,提取液中Cd、Cr、Cu、Pb、Zn的质量浓度均符合GB 8978-1996的规定;浓度较高的Pb回收效果最为显著,其回收率达95.31%,浓度较低的Cd、Cu、Zn和Cr的回收率分别为63.16%、62.71%、66.37%和54.88%;Cr^(3+)虽然不与S^(2-)反应,但通过包藏、吸附等方式被其他重金属硫化物共沉淀进入重金属回收渣,从而实现分离回收;重金属回收渣中铅质量分数高达4.24%,超过了原生铅矿Pb最低工业品位的4倍多,可以作为一种炼铅资源。本工艺简单、实用性强,为垃圾焚烧飞灰综合利用提供了一条新途径。

耐盐性高吸水树脂的辐照合成及其后处理工艺

本实验提供了一种新的PVA/PAAS/EDTA高吸水性树脂及其制备方法。采用聚乙烯醇(Poly vinyl alcohol,PVA)、聚丙烯酸钠(Poly acrylate sodium,PAAS)和乙二胺四乙酸(Ethylene diamine tetraacetic acid,EDTA),将由这些材料组成的水溶液经电子束辐射交联合成共聚物凝胶,经浸洗液溶胀和洗涤,萃冻和冷冻干燥后处理,制备出耐盐性高吸水性树脂。采用正交设计原理选出最佳配比,用不同配比的洗涤液进行后处理,研究洗涤液对树脂吸液性能的影响。测试树脂的各项性能,与国内外著名产品进行比较。结果表明,本实验制备出的高吸水性树脂具有优良的吸液速率和离心保液量,去离子水吸液倍率((821.05±1.61)g·g-1)和生理盐水吸液倍率((72.57±3.01)g·g-1)则非常显著地优于国内外著名高吸水性树脂产品(P±0.01)。

乙二醇溶剂中纳米镍的制备研究

采用乙二醇为溶剂在 6 0°C恒温水浴中 ,碱性条件下 ,不加任何表面活性剂 ,用联氨还原氯化镍 ,制备了粒径小于 10nm的球形镍粉 ,溶液中Ni2 + 的浓度可在 0 .0 4 - 0 .1mol L之间变化。考察了pH值、温度、N2 H4 ·H2 O与Ni2 +的摩尔比、溶剂等对纳米镍粒径和反应时间的影响 ,通过改变条件 ,经XRD ,TEM等检测手段进行表征 ,制备了粒径范围在 10～ 10 0nm的球形镍。且反应时间和纳米镍粒径随各个反应条件的变化具有一定的相似性。

磷酸乙二胺对硅孔雀石浮选的影响

以硅孔雀石单矿物为研究对象,通过单矿物浮选试验、溶解试验、硫残余量试验及SEM-EDS分析研究了磷酸乙二胺对硅孔雀石浮游特性的影响及其作用机理。浮选试验结果表明适量的磷酸乙二胺对硅孔雀石浮选效果很好。通过SEM-EDS分析结果表明磷酸乙二胺在硅孔雀石表面并未发生吸附,其作用类似于"催化剂",为后续硫化钠对硅孔雀石表面的硫化提供了更具有反应活性的矿物表面。而磷酸乙二胺对硅孔雀石的抑制作用发生在溶液中,而非硅孔雀石表面。

乙二胺-水体系中合成氧化锌纳米带

以乙二胺为介质,采用溶剂热法,在乙二胺-水体系中合成出宽度为20～30nm、长度为500～600nm的氧化锌纳米带,并进行了表征.在反应过程中,氧化锌纳米带通过“溶解-结晶”机制形成,溶剂乙二胺的配位是氧化锌纳米带形成的关键因素,通过调整NaOH用量控制溶液碱度,实现了氧化锌纳米带的取向生长.

超声波制备介孔结构的氮掺杂TiO_2纳米晶及其可见光催化性能(英文)

采用超声波辐射法制备了具有介孔结构的高浓度氮掺杂TiO2纳米晶(N/TiO2).采用N2物理吸附、X射线粉末衍射、X射线光电子能谱、透射电镜、光致发光谱和紫外-可见漫反射光谱等手段对N/TiO2进行了表征.以波长为400~660nm的可见光为光源,以水体污染物邻苯二甲酸二甲酯为降解对象,考察了不同制备方法对N/TiO2光催化性能的影响.结果表明,超声波辐射使氮掺杂浓度提高了2.2倍,该法制备的N/TiO2同时具有较好的介孔结构,表现了更高的光催化降解邻苯二甲酸二甲酯的活性.其活性提高的主要原因是N/TiO2含有更高浓度的氮和对可见光具有更强的吸收能力.

2-甲基吡嗪合成研究

以乙二胺和 1,2 -丙二醇为原料 ,在 Zn- Mn- Cr/活性炭催化剂上 ,研究了合成 2 -甲基吡嗪的反应温度、原料浓度、原料气空速、还原条件等因素 ,确定了最佳条件 .反应产物经色质联机检测 ,分析了乙二胺和 1,2 -丙二醇制备 2 -甲基吡嗪的反应机理 .在最佳反应条件下 ,2 -甲基吡嗪的收率可达 86.7% .

用树枝状多(胺-酰胺)作环氧树脂固化剂的研究

由丙烯酸甲酯和乙二胺(EDA)进行Michael加成反应,合成了外围带有多个活泼氢原子的树枝状多(胺-酰胺)(PAMAM1.0)。用其作环氧树脂固化剂,在理论添加量、不含稀释剂、20℃时,体系适用期和凝胶时间分别是EDA/环氧树脂体系的6.0倍和2.4倍,而在95,20和150℃固化时,固化速度分别是EDA/环氧树脂体系的1.8,3.4和4.8倍。考察了150℃时固化剂用揎、稀释剂丙酮用量对PAMAM1.0/环氧树脂体系固化时间的影响。DSC分析表明PAMAM1.0/环氧树脂体系在固化过程中分两阶段逐渐放热,且总放热量小于EDA/环氧树脂体系。TGA分析表明PAMAM1.0/环氧树脂体系固化产物开始大量分解的温度约为325℃,比EDA/环氧树脂体系高约10℃。

施用EDDS对海州香薷铜锌吸收的强化作用及淋溶风险

通过田间盆栽试验,研究了加入易降解螯合剂EDDS后污染土壤及修复植物海州香薷地上部Cu和Zn含量的变化,及地下50 cm处渗滤水中Cu、Zn浓度。结果显示,添加EDDS提高了海州香薷对Cu和Zn的吸收量,同时增加了50 cm土层处渗滤液的Cu和Zn浓度,但是渗滤液中重金属浓度仍低于国家Ⅲ类地下水水质标准,表明EDDS对于海州香薷吸收铜、锌有一定的促进作用,且对于地下水的潜在淋滤风险较小。

淀粉接枝丙烯酸甲酯与乙二胺合成高分子螯合剂

以淀粉为原料,接枝丙烯酸甲酯,然后与乙二胺反应,合成了具有多个酰胺基和胺基的螯合淀粉(SMAEN)。接枝淀粉(SMA)的接枝率(GP)和接枝效率(GE)分别为44.14%和18.42%。由凯式定氮法测得此螯合淀粉的含氮量为2.86%。红外光谱分析结果表明,淀粉已经成功地被接枝和螯合。将螯合淀粉用于对铜离子和银离子的吸附,结果表明,对铜离子和银离子的吸附量分别为:3.328和1.667 mmol/g。