Based on the determined affinity series of rare earth element complexes with IMDA for the anion-exchangers, purification of macroquantities of Nd 3+ from Y 3+, Sm 3+ from Ho 3+, La 3+ from Nd 3+ and ...Based on the determined affinity series of rare earth element complexes with IMDA for the anion-exchangers, purification of macroquantities of Nd 3+ from Y 3+, Sm 3+ from Ho 3+, La 3+ from Nd 3+ and La 3+ from Pr 3+ on the weakly basic gel anion-exchanger Amberlite IRA-68 was studied. Using the presented method on 1 L of Amberlite IRA-68 in the acetate form, it is possible to obtain about 240 g Nd 2O 3 purified from Y 2O 3. Great difference in affinity of La 3+ and Nd 3+ as well as Pr 3+ complexes for this anion-exchanger in the acetate form indicates the possibility of applying this process for purification of lanthanum on the increased scale. On 1 L of Amberilte IRA-68 in the acetate form it is possible to obtain about 1125 g La 2O 3 purified from Nd 2O 3. On the basis of these results it can be assumed that unique properties of polyacrylate anion-exchangers enable their application for separation of rare earth elements.展开更多
The title compound, [InCl（C4H5NO4）]n, has been synthesized via the hydrothermal method and characterized by IR, elemental analysis, UV-Vis-Nir spectra and single-crystal X-ray diffraction analysis. Single-crystal X-...The title compound, [InCl（C4H5NO4）]n, has been synthesized via the hydrothermal method and characterized by IR, elemental analysis, UV-Vis-Nir spectra and single-crystal X-ray diffraction analysis. Single-crystal X-ray analyses show that it is a carboxylate-bridged two-dimensional layer network indium（III） polymer, catena-poly[[chloroindium（III）]-μ-（iminodiacetate к4N,O,O＇：O＇＇：O＇＇＇]. The crystal is of orthorhombic system, space group Pnma with a = 13.5970（13）, b = 8.7671（10）, c = 6.0427（5）, C4H5ClInNO4, Mr = 281.36, V = 720.33（12）3, Z = 4, Dc = 2.594 g/cm3, F（000） = 536, μ = 3.613 mm-1, R = 0.0245 and wR = 0.0570. The In（III） ion exhibits an approximately octahedral InClNO4 coordination environment, with the two O donor atoms of iminodiacetate and two O atoms belonging to the carboxylate group of two adjacent iminodiacetates occupying the basal positions, and the chlorine ion and one nitrogen atom of iminodiacetate in the apical sites. Carboxylate groups are mutually cis oriented, and each syn-anti carboxylate group bridges two indium（III） ions via two different basal positions, resulting in the formation of a 2-D network with rhombus （4, 4） grids. Each rhombus grid unit is formed from four indium atoms and four iminodiacetate units with the diagonal lengths of 8.767（1） and 6.043（1）.展开更多
The ionic composition of an iminodiacetate electrolyte as a function of solution composition and pH has been deter-mined. The kinetic parameters (exchange currents and apparent transfer coefficients) of the electrored...The ionic composition of an iminodiacetate electrolyte as a function of solution composition and pH has been deter-mined. The kinetic parameters (exchange currents and apparent transfer coefficients) of the electroreduction of a palla-dium(II) bis-iminodiacetate complex from an electrolyte containing excess ligand have been calculated. It has been shown that the rate of the electrode process is controlled by the diffusion of reduced ions to the electrode surface and by the electron-transfer reaction. The possibility of using iminodiacetate electrolyte for palladium plating for the deposition of fine-crystalline adherent and ductile palladium coatings has been examined.展开更多
A direct analysis method combining an iminodiacetate extraction disk (IED) with graphite furnace atomic absorption spectrometry was developed for the determination of Co, Ni, Cu, Cd, Sn, Pb, and Bi at sub-ppb levels i...A direct analysis method combining an iminodiacetate extraction disk (IED) with graphite furnace atomic absorption spectrometry was developed for the determination of Co, Ni, Cu, Cd, Sn, Pb, and Bi at sub-ppb levels in water. A 100 mL water sample was adjusted to pH 5.6 with nitric acid and a 1 mol?L–1 ammonium acetate solution, and then passed through an IED (diameter, 47 mm;effective filtering diameter, 35 mm) at a flow rate of 80 - 100 mL?min–1 to preconcentrate seven analytes. The IED was dried at 100?C for 20 min in an electric oven, and 110 - 145 small disks, each 2 mm in diameter, were punched out from the IED. A small disk was introduced into the graphite furnace and atomized according to a heating program. For Cd, Sn, Pb, and Bi measurements, Pd was used as a chemical modifier to enhance the absorbances. Calibration was performed using aqueous standard solutions. The detection limits, corresponding to three times the standard deviation (n = 5) of the blank values, were 0.092 μg·L–1 for Co, 0.12 μg·L–1 for Ni, 0.40 μg·L–1 for Cu, 0.077 μg·L–1 for Cd, 0.92 μg·L–1 for Sn, 0.61 μg·L–1 for Pb, and 0.80 μg·L–1 for Bi with an enrichment factor of 140 using a 100-mL water sample. A spike test for the seven analytes in tap water, rainwater, river water, and mineral drinking water showed quantitative recoveries (93% - 108%).展开更多
The adsorption behavior and mechanism of a novel chelate resin, iminodiacetic acid resin (IDAAR) for Y? were investigated. The statically saturated adsorption capacity is 102mg· g- 1 resin at 298K in HAc NaAc med...The adsorption behavior and mechanism of a novel chelate resin, iminodiacetic acid resin (IDAAR) for Y? were investigated. The statically saturated adsorption capacity is 102mg· g- 1 resin at 298K in HAc NaAc medium at pH 5.7. Y? adsorbed on IDAAR can be reductively eluted by 1.0～ 4.0mol· L- 1 HCl used as eluant and the elution percentages are almost as high as 100% . The resin can be regenerated and reused without apparent decrease in adsorption capacity. The apparent adsorption rate constant is k298=3.36× 10- 5s- 1. The adsorption behavior of IDAAR for Y? conforms to Freundlich′ s model reasonably. The thermodynamic adsorption parameter, enthalpy change Δ H of IDAAR for Y? is 18.6kJ· mol- 1. The complex molar ratio of the functional group of IDAAR to Y? is about 3∶ 1. The adsorption mechanism of IDAAR for Y? was examined by using chemical method and IR spectrometry.展开更多
A new nickel coordination compound [Ni(L2-)(2,2′-bipy)(H2O)]·2H2O (H2L=phenyliminodiacetic acid) was obtained by self-assembly of phenyliminodiacetic acid, 2,2′-bipy, and NiCl2·6H2O in the mixed solvent of...A new nickel coordination compound [Ni(L2-)(2,2′-bipy)(H2O)]·2H2O (H2L=phenyliminodiacetic acid) was obtained by self-assembly of phenyliminodiacetic acid, 2,2′-bipy, and NiCl2·6H2O in the mixed solvent of water and ethanol (V∶V=1∶1). The complex was characterized by elemental analysis, IR spectra, and X-ray crystallography analysis. The crystal is monoclinic, space group P21 / c with a=0.867 4(2) nm, b=0.907 3(1) nm, c=2.643 5(5) nm, β=91.01(1)°, V=2.080 2(4) nm3, Z=4, F(000)=992, Dc=1.520 Mg·m-3, R1=0.027 0 and wR2=0.067 5. In the complex, nickel atom is coordinated with a distorted octahedral geometry and extensive hydrogen bonds link the complexes into a 2D network structure. CCDC: 244926.展开更多
文摘Based on the determined affinity series of rare earth element complexes with IMDA for the anion-exchangers, purification of macroquantities of Nd 3+ from Y 3+, Sm 3+ from Ho 3+, La 3+ from Nd 3+ and La 3+ from Pr 3+ on the weakly basic gel anion-exchanger Amberlite IRA-68 was studied. Using the presented method on 1 L of Amberlite IRA-68 in the acetate form, it is possible to obtain about 240 g Nd 2O 3 purified from Y 2O 3. Great difference in affinity of La 3+ and Nd 3+ as well as Pr 3+ complexes for this anion-exchanger in the acetate form indicates the possibility of applying this process for purification of lanthanum on the increased scale. On 1 L of Amberilte IRA-68 in the acetate form it is possible to obtain about 1125 g La 2O 3 purified from Nd 2O 3. On the basis of these results it can be assumed that unique properties of polyacrylate anion-exchangers enable their application for separation of rare earth elements.
基金supported by the Science and Technology Foundation of Ministry of Development of China (2010-K7-12)the Science Foundation of Suzhou University of Science and Technology
文摘The title compound, [InCl（C4H5NO4）]n, has been synthesized via the hydrothermal method and characterized by IR, elemental analysis, UV-Vis-Nir spectra and single-crystal X-ray diffraction analysis. Single-crystal X-ray analyses show that it is a carboxylate-bridged two-dimensional layer network indium（III） polymer, catena-poly[[chloroindium（III）]-μ-（iminodiacetate к4N,O,O＇：O＇＇：O＇＇＇]. The crystal is of orthorhombic system, space group Pnma with a = 13.5970（13）, b = 8.7671（10）, c = 6.0427（5）, C4H5ClInNO4, Mr = 281.36, V = 720.33（12）3, Z = 4, Dc = 2.594 g/cm3, F（000） = 536, μ = 3.613 mm-1, R = 0.0245 and wR = 0.0570. The In（III） ion exhibits an approximately octahedral InClNO4 coordination environment, with the two O donor atoms of iminodiacetate and two O atoms belonging to the carboxylate group of two adjacent iminodiacetates occupying the basal positions, and the chlorine ion and one nitrogen atom of iminodiacetate in the apical sites. Carboxylate groups are mutually cis oriented, and each syn-anti carboxylate group bridges two indium（III） ions via two different basal positions, resulting in the formation of a 2-D network with rhombus （4, 4） grids. Each rhombus grid unit is formed from four indium atoms and four iminodiacetate units with the diagonal lengths of 8.767（1） and 6.043（1）.
文摘The ionic composition of an iminodiacetate electrolyte as a function of solution composition and pH has been deter-mined. The kinetic parameters (exchange currents and apparent transfer coefficients) of the electroreduction of a palla-dium(II) bis-iminodiacetate complex from an electrolyte containing excess ligand have been calculated. It has been shown that the rate of the electrode process is controlled by the diffusion of reduced ions to the electrode surface and by the electron-transfer reaction. The possibility of using iminodiacetate electrolyte for palladium plating for the deposition of fine-crystalline adherent and ductile palladium coatings has been examined.
文摘A direct analysis method combining an iminodiacetate extraction disk (IED) with graphite furnace atomic absorption spectrometry was developed for the determination of Co, Ni, Cu, Cd, Sn, Pb, and Bi at sub-ppb levels in water. A 100 mL water sample was adjusted to pH 5.6 with nitric acid and a 1 mol?L–1 ammonium acetate solution, and then passed through an IED (diameter, 47 mm;effective filtering diameter, 35 mm) at a flow rate of 80 - 100 mL?min–1 to preconcentrate seven analytes. The IED was dried at 100?C for 20 min in an electric oven, and 110 - 145 small disks, each 2 mm in diameter, were punched out from the IED. A small disk was introduced into the graphite furnace and atomized according to a heating program. For Cd, Sn, Pb, and Bi measurements, Pd was used as a chemical modifier to enhance the absorbances. Calibration was performed using aqueous standard solutions. The detection limits, corresponding to three times the standard deviation (n = 5) of the blank values, were 0.092 μg·L–1 for Co, 0.12 μg·L–1 for Ni, 0.40 μg·L–1 for Cu, 0.077 μg·L–1 for Cd, 0.92 μg·L–1 for Sn, 0.61 μg·L–1 for Pb, and 0.80 μg·L–1 for Bi with an enrichment factor of 140 using a 100-mL water sample. A spike test for the seven analytes in tap water, rainwater, river water, and mineral drinking water showed quantitative recoveries (93% - 108%).
文摘The adsorption behavior and mechanism of a novel chelate resin, iminodiacetic acid resin (IDAAR) for Y? were investigated. The statically saturated adsorption capacity is 102mg· g- 1 resin at 298K in HAc NaAc medium at pH 5.7. Y? adsorbed on IDAAR can be reductively eluted by 1.0～ 4.0mol· L- 1 HCl used as eluant and the elution percentages are almost as high as 100% . The resin can be regenerated and reused without apparent decrease in adsorption capacity. The apparent adsorption rate constant is k298=3.36× 10- 5s- 1. The adsorption behavior of IDAAR for Y? conforms to Freundlich′ s model reasonably. The thermodynamic adsorption parameter, enthalpy change Δ H of IDAAR for Y? is 18.6kJ· mol- 1. The complex molar ratio of the functional group of IDAAR to Y? is about 3∶ 1. The adsorption mechanism of IDAAR for Y? was examined by using chemical method and IR spectrometry.
文摘A new nickel coordination compound [Ni(L2-)(2,2′-bipy)(H2O)]·2H2O (H2L=phenyliminodiacetic acid) was obtained by self-assembly of phenyliminodiacetic acid, 2,2′-bipy, and NiCl2·6H2O in the mixed solvent of water and ethanol (V∶V=1∶1). The complex was characterized by elemental analysis, IR spectra, and X-ray crystallography analysis. The crystal is monoclinic, space group P21 / c with a=0.867 4(2) nm, b=0.907 3(1) nm, c=2.643 5(5) nm, β=91.01(1)°, V=2.080 2(4) nm3, Z=4, F(000)=992, Dc=1.520 Mg·m-3, R1=0.027 0 and wR2=0.067 5. In the complex, nickel atom is coordinated with a distorted octahedral geometry and extensive hydrogen bonds link the complexes into a 2D network structure. CCDC: 244926.
