Eu3+-2-噻吩甲酰三氟丙酮、三苯基氧膦三元配合物的合成应用

以二苯甲酰甲烷和三苯基氧膦为混合配体,合成了三元配合物Eu(HTTA)_3(TPPO)_2。对配合物进行了氢谱、红外结构表征。配合物经紫外光谱、荧光光谱、荧光寿命、荧光量子效率等分析,表明配合物可以发出很强的铕的特征红色荧光,其荧光寿命为753.41μs,荧光量子效率为83.00%。配合物作为红光材料,制成白光LED器件,进行色温和色坐标的测定,表明该材料具有一定的应用前景。     

五种具有荧光性能的新型配合物的合成

设计并合成了5种具有荧光性能的反式2?[(4′-二甲胺基)苯乙烯基]吡啶配合物。用元素分析、红外光谱、紫外光谱等手段对配合物进行了表征,并对配合物的溶解性、热稳定性和荧光性能进行了研究。结果证明,这5种配合物都有较强的荧光性能,适合掺入涂料中做成荧光涂料。     

八种具有荧光性能的新型配合物的合成与性能研究

设计并合成了8种新的具有荧光性能的反式2-[(4′-二乙氨基)苯乙烯基]吡啶配合物。用元素分析、红外光谱、紫外光谱等方法对配合物进行了表征,并对配合物的溶解性、热稳定性和荧光性能进行了研究。结果表明,这8种配合物都有较强的荧光性能,适合掺入涂料中做成荧光涂料。     

两种铀配合物对生物分子的荧光标记性质研究

选用2种铀配合物分别与4种典型的生物分子多巴胺(DA)、抗坏血酸(AA)、尿酸(UA)和牛血清白蛋白(BSA)相互作用,采用荧光分光光度计进行荧光标记性质测试,研究铀配合物对4种生物分子的荧光标记性质。结果表明,4种生物分子对铀配合物的荧光发光产生了一定影响,在不同浓度梯度的生物分子中,浓度越大对铀配合物荧光强度的影响也越大;随着生物分子浓度的增大,出现了荧光猝灭现象,这2种铀配合物可以作为生物分子的荧光探针。为铀配合物在生物分子荧光标记研究方面的应用提供了一定的依据。     

稀土配合物及其共聚物的合成与性能研究

以丙烯酸(HAA)、甲基丙烯酸(HMA)及1,10-邻菲罗啉(Phen)为配体与氧化铕(Eu2O3)反应得到二元配合物Eu(AA)3、Eu(MA)3和三元配合物Eu(AA)3Phen、Eu(MA)3Phen。将生成的配合物与HMA和甲基丙烯酸甲酯(MMA)共聚,得到一系列三元共聚物。通过元素分析、红外光谱、荧光光谱和热分析对配合物进行了分析与表征,发现配合物具有良好的荧光强度和热稳定性。三元配合物的荧光强度相对于二元配合物有显著提高。共聚物可发射Eu3+的特征荧光,荧光强度随配合物含量的增加而增加,且未发生浓度猝灭现象。三元配合物在反应单体MMA和HMA中的溶解度低于二元配合物,从而使在最大溶解度下二元配合物与反应单体生成共聚物的荧光强度高于相应的三元配合物与反应单体生成的共聚物。     

聚丙烯荧光材料制备及其3D打印测试

通过配位反应合成了三种荧光配合物:铕配合物[Eu(DBM)3phen],8-羟基喹啉铝配合物(AlQ3)和8-羟基喹啉锌配合物(ZnQ2),然后通过熔融共混的方式在聚丙烯(PP)材料中分别掺杂这三种荧光配合物,制得三种PP/荧光配合物复合材料,以提高PP发光性能.对这三种复合材料进行了一系列的荧光和力学性能测试.结果表...     

大Stoke’s位移的铽配合物

本文综述了稀土铽与有机含氧、含氮及大环配合体形成配合物的配合稳定性，探讨了铽配合物荧光产生的机理及产生大Stoke’s位移的原因，详述了各种试配合物的荧光性能以及它们的应用。     

铽-聚N-乙烯基乙酰胺-1,10-菲罗啉三元配合物的光学性能

以N乙烯基乙酰胺(NVA)为原料通过自由基聚合反应合成了N乙烯基乙酰胺(PNVA),在乙醇溶液中合成了铽聚N乙烯基乙酰胺1,10菲罗啉(TbPNVAphen)的三元稀土高分子配合物。利用FTIR、UV-vis和荧光光谱对三元配合物进行了结构表征。荧光光谱表明,配合物的最佳激发波长为304nm;在此波长激发下,配合物在490nm和546nm处发出较强铽的特征荧光,荧光强度分别为846.853和2086.798,分别比TbPNVA配合物增强了1310%和1290%。     

铽(镧、钆)-乙酰丙酮-邻菲啰啉配合物的合成及其在塑料中的应用

合成了铽-乙酰丙酮-邻菲啰啉配合物,发现镧、钆对铽-乙酰丙酮-邻菲啰啉配合物具有荧光增强作用,应用荧光镧、铽混合配合物制备了光致发光塑料。     

一种双功能的含呋喃和异噁唑环酰腙Cu(Ⅱ)配合物的合成及其性能研究

合成了一种含异噁唑环和呋喃环的新型酰腙的Cu(Ⅱ)配合物,通过红外、紫外光谱和荧光光谱等研究了该配合物的结构及其性质,同时测定了铜配合物对枯草芽孢杆菌、绿脓杆菌、大肠杆菌和金黄色葡萄球菌的抑菌活性。结果表明,铜配合物的水溶液在484 nm处呈现一强蓝色荧光发射峰。铜配合物有较好的抑菌效果,其抑菌活性明显优于配体。该配合物兼有荧光性能和抑菌活性,可应用在材料科学、光动力学疗法等领域。     

Impedance study of electropolymerized films of polyNi(II)-macrocycles

Glassy carbon electrodes modified by electropolymerization of two water-soluble compounds, Ni(II)tetrasulphophthalocyanine (NiTSPc) and Ni(II)tetrasulphophenylporphyrin (NiTSPP), and of two water-insoluble compounds, Ni(II)tetraaminophthalocyanine (NiTAPc) and Ni(II)tetraaminophenylporphyrin (NiTAPP), have been studied by impedance measurements. While in the tetrasulpho films the Ni(II)/Ni(III) process was operative, the tetraamino films required activation by repetitive potential cycling before the peaks of this process appeared in the CV, and even then the charge was a fraction of that shown by the tetrasulpho films. The Nyquist plots of all these films shown in the potential range of the Ni(II)/Ni(III) process the semicircle typical of a charge transfer, the charge-transfer resistance decreasing very much with increasing potential. The uncompensated resistance of the GC electrode was barely affected by the films, showing that they were very porous. The impedance at low frequencies of the thick polyNiTSPP film, the thin polyNiTSPc film, and also the activated polyNiTAPc film fitted the Warburg model, the diffusing species being probably the hydroxyl ions involved in the process.     

A new kinetic model for Ni(II) ion flotation based on gene expression programming

ABSTRACT

The Ni(II) ion flotation kinetics with sodium dodecylsulfate as collector was studied with the aim of developing new models to predict the flotation rate constant (k) of Ni(II) ions and water removal during the process of Ni(II) ion flotation. In this regard, the most influential parameters on Ni(II) ion flotation efficiency including the ratio of collector concentration on the Ni(II) ion concentration, impeller speed, activity coefficient, and pH were used to develop predictive models. The results show that the proposed gene expression programming models can be used to predict the flotation rate constant of Ni(II) ions and water removal.     

COBALT–NICKEL SEPARATION: THE EXTRACTION OF COBALT(II) AND NICKEL(II) WITH BIS(2-ETHYLHEXYL) PHOSPHINIC ACID (PIA-8) IN TOLUENE

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 pH_0.5 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.     

Heavy metals adsorption on some iminodiacetate chelating resins as a function of the adsorption parameters

The adsorption properties of some novel chelating resins (CRs) bearing iminodiacetate groups for removal of heavy metal ions like: Cu(II), Co(II) and Ni(II) from aqueous solutions comparative with the commercial resin Amberlite IRC-748 have been studied in this work by a batch equilibrium technique. Quantitative analysis for adsorption was conducted using UV–vis spectroscopy to investigate the kinetics, adsorption isotherm and thermodynamics of the removal process considering equilibration time, pH, metal ion concentration and temperature as controlling parameters. The metal adsorption capacities, at pH 5, were in the order Cu(II) > Ni(II) > Co(II), for both the CR with 10 wt.% DVB (CR-10) and the commercial resin Amberlite IRC-748. The adsorption capacities on CR-10 were higher for Ni(II) and Co(II) ions, but lower for Cu(II) ions compared with Amberlite IRC-748. Both Freundlich and Langmuir isotherms well fitted on the adsorption results of Cu(II), Ni(II) and Co(II) ions on all iminodiacetate resins.     

Investigation of Heavy Metal Ion Adsorption Characteristics of Poly(N,N Dimethylamino Ethylmethacrylate) Hydrogels

Abstract

In this study, Poly(N,N dimethyl‐amino ethylmethacrylate) (Poly(DMAEMA)) hydrogels with varying compositions were prepared in the form of rods by irradiating ternary mixtures of N,N‐dimethylamino ethylmethacrylate/ethyleneglycoldimethacrylate/water with gamma rays at ambient temperature. Swelling studies of poly (DMAEMA) hydrogels were performed at different pH values and maximum swelling values reached at pH 2. The adsorption characteristics of Pb(II), Cd(II), Ni(II), Zn(II), Cu(II), and Co(II) ions to poly(N,N dimethylamino ethylmethacrylate) hydrogels were investigated by a batch process. The order of affinity based on amount of metal ion uptake was found as follows: Cu(II)>Zn(II)?Co(II)>Pb(II) >> Ni(II)>Cd(II). In the adsorption studies of Cu(II), Zn(II), Co(II), Pb(II), Ni(II), and Cd(II) ions the Langmuir type adsorption isotherms were observed for all gel systems.     

Divinylbenzene-crosslinked polyacrylamide-supported dithiocarbamates as metal complexing agents

Summary Dithiocarbamate (DTC) functions were incorporated into divinylbenzene-crosslinked (2–20 mole %) polyacrylamides by a two-step polymer-analogous reaction. The complexations of these resins with DTC functions in different structural environments were investigated towards Co(II), Ni(II), Cu(II), Zn(II) and Hg(II) by batch equilibration technique. The metal ion intake decreased with the extent of the DVB content in the order Hg(II)>>Cu(II)>Zn(II)>Ni(II)>Co(II). The time-course on complexation, swelling behaviours of the uncomplexed and complexed resins, recyclability, IR and thermogravimetric characterisation of the complexes were carried out. The swelling of the resins decreased on complexation with metal ions and the thermal stability increased.     

Novel Poly(Styrene) Attached Schiff Bases for Uptake Mn(II) and Ni(II) Ions and as Antimicrobial Agent against Micrococcus luteus

In this study, three novel poly(styrene) attached Schiff bases (AMP–SB) were synthesized from condensation reaction of (aminomethyl)polystyrene with 2-hydroxy-5-bromobenzaldehyde, 2-hydroxy-5-methylbenzaldehyde and 2-hydroxy-5-chlorobenzaldehyde for uptake from solutions containing Mn(II) and Ni(II) ions and as antimicrobial agent against Micrococcus luteus. Furthermore coordination polymers were synthesized including Mn(II) and Ni(II) ions for understand to geometric structure of uptake ions. Polymers attached Schiff bases and coordination polymers were characterized by means of elemental analyses, magnetic measurements, FTIR, UV-GB, TG/DTA and ¹H-NMR. The Ni(II) and Mn(II) contents in the metal-containing polymer complexes were determined by the ICP-MS technique. Antibacterial activities of the polymers attached Schiff bases and their complexes were studied by the well-diffusion method against M. luteus (ATCC-9341).     

Removal of nickel from aqueous solutions by citric acid modified Ceiba pentandra hulls: Equilibrium and kinetic studies

The removal of Ni(II) from aqueous solutions using biomass prepared from Ceiba pentandra hulls powder modified with citric acid treatment (CAMCPH) has been studied by batch method. The biosorbent was characterised before and after citric acid modification using SEM, FT‐IR and XRD. Experimental parameters that influence the biosorption of Ni(II), such as pH, biosorbent dose, contact time and initial concentration of metal ion have been investigated. The adsorption of Ni(II) increased with increase in contact time and reached equilibrium within 50 min. The maximum removal of Ni(II) was observed at pH 5.0. The kinetic data were analysed using three adsorption kinetic models: the pseudo‐first, second‐order kinetics and intra‐particle diffusion. The results showed that the pseudo‐second‐order model fits the experimental data very well. The equilibrium data were analysed using Langmuir, Freundlich and Dubinin–Radushkevich isotherm models. Langmuir model provided the best correlation for the adsorption of Ni(II) by CAMCPH and the monolayer biosorption capacity for Ni(II) removal was 34.34 mg/g. Desorption experiments were carried out using HCl solution and the recovery of the metal ion from CAMCPH was found 98%. Desorption experiments showed the feasibility of regeneration of the biosorbent for further use after treating with dilute HCl. © 2011 Canadian Society for Chemical Engineering     

Molecularly imprinted smart cryogels for selective nickel recognition in aqueous solutions

Smart polymers with fast response to slight changes show high practicability in separation and removal applications, such as water and wastewater treatment. Molecular imprinted polymers (MIPs) are designed to possess specific binding sites enabling the recognition of the target analytes. In this article, the newly synthesized smart adsorbents were used for the selective removal of nickel [Ni(II)] ions from aqueous solutions, which have dual (pH and temperature) memory for the recognition of Ni(II) ions due to the self-assembled recognition sites in MIP structure. The Ni(II)-MIP smart cryogels were prepared by cryopolymerization of N-isopropylacrylamide (NIPAm) and N-methacryloyl-l -histidine (MAH) monomers to incorporate their smart features for removal of Ni(II) ions in a selective and temperature-modulated way. The maximum binding capacity of Ni(II) ions onto MIP smart cryogel was determined at pH 6 as 414 μg g⁻¹ at 20°C and only 104.5 μg g⁻¹ at 40°C, respectively. The adsorption reached an equilibrium within 30 min, while 85% of the bound amount of Ni(II) ions was achieved in only 15 min. This unique MIP cryogel as a smart and selective adsorbent was able to remove Ni(II) ions immediately by a significant temperature and pH change as an alternative application for water and wastewater treatment.     

Investigation of ultrasound assisted regeneration of Ni–bentonite with response surface methodology (RSM)

This paper assesses the potential of ultrasonic desorption of toxic heavy metal Ni(II) from bentonite for regeneration purposes. Response surface methodology (RSM) was employed to optimize the desorption of Ni(II) retained on bentonite by varying the amount of adsorbent, contact time, pH and ultrasound time. The results indicated that in the present experimental setup, the pH and the ultrasound time were the most significant variables affecting Ni(II) desorption from bentonite. Based on statistical analysis, the Ni(II) desorption model was highly significant with very low p-values (< 0.0001) and the optimal control parameters were determined as follows: solid/liquid ratio (0.5 g/mL), contact time (6 h), pH (3.37) and ultrasound time (30 min). The experimental value of desorption percentage (59.4%) for regeneration of bentonite under the optimum conditions is in agreement with the predicted value of 64.5%.