A selective method has been developed for the extraction chromatography of aluminium(Ⅲ) and its separation from several metal ions with a chromatographic column containing N-n-octylaniline ( a liquid anion exchanger)...A selective method has been developed for the extraction chromatography of aluminium(Ⅲ) and its separation from several metal ions with a chromatographic column containing N-n-octylaniline ( a liquid anion exchanger) coated on silanized silica gel as a stationary phase. The aluminium(Ⅲ) was quantitatively extracted with the 0. 065 mol / L N-n-octylaniline in 0. 013 to 0. 05 mol / L sodium succinate at a flow rate of 1. 0 mL / min. The extracted metal ion has been recovered by eluting with 25. 0 mL of 0. 05 mol / L hydrochloric acid and estimated spectrophotometrically with aurintricarboxylic acid. The effects of the acid concentration,the reagent concentration,the flow rate and the eluting agents have been investigated. The log-log plots of distribution coefficient ( K d ( Al(Ⅲ) ) ) versus N-n-octylaniline concentration in 0. 005 and 0. 007 mol / L sodium succinate gave the slopes of 0. 5 and 0. 7 respectively and showed the probable composition of the extracted species was 1∶ 1 ( metal to amine ratio ) and the nature of extracted species was [RR' NH + 2 Al succinate 2 ] org. . The extraction of aluminium(Ⅲ) was carried out in the presence of various ions to ascertain the tolerance limit of individual ions. Aluminium(Ⅲ) has been separated from multicomponent mixtures,pharmaceutical samples and synthetic mixtures corresponding to alloys. A scheme for mutual separation of aluminium(Ⅲ) ,indium(Ⅲ) ,gallium(Ⅲ) and thallium(Ⅲ) has been developed by using suitable masking agents. The method is fast,accurate and precise.展开更多
The interaction of gallium（Ⅲ） with the ligands containing phenolic group（s）, such as salicylic acid, 8-hydroxyquinoline, N,N＇-bis（2-hydroxybenzyl）ethylenediamine-N,N＇diacetic acid （HBED）, N,N＇-ethylenebis...The interaction of gallium（Ⅲ） with the ligands containing phenolic group（s）, such as salicylic acid, 8-hydroxyquinoline, N,N＇-bis（2-hydroxybenzyl）ethylenediamine-N,N＇diacetic acid （HBED）, N,N＇-ethylenebis[2-（o- hydroxyphenyl）glycine （EHPG）, and ovotransferrin, was studied, respectively, by means of fluorescence in 0.01 mol/L Hepes at pH 7.4 and room temperature. Fluorescence intensity showed an increase when gallium（Ⅲ） was bound to 8-hydroxyquinoline and HBED. In contrast, it was decreased with the interaction of gallium（Ⅲ） with salicylic acid and EHPG. At pH 7.4, there was N…H-O type intramolecular hydrogen bond in the former, and the latter existed O…H-O type intramolecular hydrogen bond. Fluorescence titration of apoovotransferrin with gallium（Ⅲ） displayed that the fluorescence intensity was decreased at the N-terminal binding site, while enhanced at the C-terminal binding site. It can account for the O…H-O type intramolecular hydrogen bonds for the phenolic groups of Tyr92 and Tyr191 residues at the N-terminal binding site. And there are N…H-O type intramolecular hydrogen bonds for Tyr431 and Tyr524 residues at the C-terminal binding site. In addition, under the same conditions, the conditional binding constant of gallium（Ⅲ） with EHPG or HBED determined by fluorescence method is lg KGa-EHPG=19.18 or lg KGa-HBED= 19.08.展开更多
Nano-TiO2 was employed for the adsorption of gallium from aqueous solution in batch equilibrium experiments to investigate its adsorption properties. It was found that the adsorption efficiency of Ga（Ⅲ） was more th...Nano-TiO2 was employed for the adsorption of gallium from aqueous solution in batch equilibrium experiments to investigate its adsorption properties. It was found that the adsorption efficiency of Ga（Ⅲ） was more than 96% at pH 3.0. The adsorption capacities and rates of Ga（Ⅲ） onto nano-TiO2 were evaluated as a function of solution concentration and temperature. The results were analyzed using the Langmuir adsorption isotherms. Adsorption isothermal data could be well interpreted by the Langmuir model. The mean energy of adsorption, 15.81 kJ.mol^-1, was calculated from the D-R adsorption isotherm. The kinetic experimental data properly correlate with the pseudo-second-order kinetic model. The thermodynamic parameters for the process of adsorption have been estimated. The △H and △G values of gallium（Ⅲ） adsorption on nano-TiO2 showed an endothermic and spontaneous nature of adsorption.展开更多
Selective separation of gallium from aluminum by ion flotation using sodium dodecyl sulfate(SDS) as an anionic surfactant and fluoride as an inorganic ligand was investigated. The experimental results were analyzed us...Selective separation of gallium from aluminum by ion flotation using sodium dodecyl sulfate(SDS) as an anionic surfactant and fluoride as an inorganic ligand was investigated. The experimental results were analyzed using the stability constants and speciation diagrams of fluoride metal complexes. The presence of fluoride in the solution has a positive influence upon the separation of gallium from aluminum. The results show that increasing the fluoride concentration makes a more effective separation of gallium from aluminum because of a simultaneous increase in the complexion of aluminum with fluoride and a change in the electrical charge of the aluminum(ALF_4^-). The dehydration model of LIU and DOYLE was also applied to compare the ion flotation and the selectivity coefficients of gallium over aluminum with experimental results.展开更多
A new extractant, [N,N-di（2-ethylhexyl）aminolmethylphenylphosphinic acid （DEAPP）, was synthesized to de- velop the mutual separation techniques of In（Ⅲ）, Ga（Ⅲ） and Zn（Ⅱ）. The extraction selectivity for I...A new extractant, [N,N-di（2-ethylhexyl）aminolmethylphenylphosphinic acid （DEAPP）, was synthesized to de- velop the mutual separation techniques of In（Ⅲ）, Ga（Ⅲ） and Zn（Ⅱ）. The extraction selectivity for In（Ⅲ）, Ga（Ⅲ） and Zn（Ⅱ） with DEAPP was higher than that of the commercial phosphorus acid extractants such as D2EHPA and PC-88A. The extraction selectivity for metal ions in 1 mob L 1 aqueous ammonium nitrate solution with DEAPP was in the following order： In（Ⅲ） 〉 Ga（Ⅲ） 〉 Zn（Ⅱ）. These selective extraction behaviors indicate that the amino moiety of DEAPP plays an important role in the mutual separation of ln（Ⅲ）, Ga（Ⅲ） and Zn（ll）. The extraction equilibria of In（Ⅲ）, Ga（Ⅲ） and Zn（Ⅱ） with DEAPP （ = HR） were expressed by the following reactions： In3＋ ＋ 2（HR）2 InR3（HR） ＋ 3H＋, Ga3＋ ＋ 1.5（HR）2 ＋ N- = GaR2（HR）（NO3） ＋ 2H＋, and Zn2＋ 4- 2（HR）2 ZnR2 （HR） 2 determined 4- 2H＋. The extraction equilibrium constants of In（Ⅲ）, Ga（Ⅲ） and Zn（Ⅱ） with DEAPP were to be Kex, M = 1.7 × 104 [dm3.mol 1], 4.17 [（dm3.mol-1）s], and 1.55 × 10 2 [-], respectively.展开更多
基金supported by the National Natural Science Foundation of China(20971046,21171057,61178037,11004256)Natural Science Foundation of Guangdong Province,China(10351064101000000)+1 种基金Open Fund of the State Key Laboratory of Optoelectronic Materials and Technologies(SunYat-Sen University),ChinaAppropriative Researching Fund for Professors and Doctors,Guangdong University of Education,China(10ARF14)~~
基金supported by BCUD,Pune University for providing financial assistance in form of a research project
文摘A selective method has been developed for the extraction chromatography of aluminium(Ⅲ) and its separation from several metal ions with a chromatographic column containing N-n-octylaniline ( a liquid anion exchanger) coated on silanized silica gel as a stationary phase. The aluminium(Ⅲ) was quantitatively extracted with the 0. 065 mol / L N-n-octylaniline in 0. 013 to 0. 05 mol / L sodium succinate at a flow rate of 1. 0 mL / min. The extracted metal ion has been recovered by eluting with 25. 0 mL of 0. 05 mol / L hydrochloric acid and estimated spectrophotometrically with aurintricarboxylic acid. The effects of the acid concentration,the reagent concentration,the flow rate and the eluting agents have been investigated. The log-log plots of distribution coefficient ( K d ( Al(Ⅲ) ) ) versus N-n-octylaniline concentration in 0. 005 and 0. 007 mol / L sodium succinate gave the slopes of 0. 5 and 0. 7 respectively and showed the probable composition of the extracted species was 1∶ 1 ( metal to amine ratio ) and the nature of extracted species was [RR' NH + 2 Al succinate 2 ] org. . The extraction of aluminium(Ⅲ) was carried out in the presence of various ions to ascertain the tolerance limit of individual ions. Aluminium(Ⅲ) has been separated from multicomponent mixtures,pharmaceutical samples and synthetic mixtures corresponding to alloys. A scheme for mutual separation of aluminium(Ⅲ) ,indium(Ⅲ) ,gallium(Ⅲ) and thallium(Ⅲ) has been developed by using suitable masking agents. The method is fast,accurate and precise.
基金Project supported by the National Natural Science Foundation of China （No. 20371031 ） and the Shanxi Provincial Natural Science Foundation for Youth （No. 20051006）.
文摘The interaction of gallium（Ⅲ） with the ligands containing phenolic group（s）, such as salicylic acid, 8-hydroxyquinoline, N,N＇-bis（2-hydroxybenzyl）ethylenediamine-N,N＇diacetic acid （HBED）, N,N＇-ethylenebis[2-（o- hydroxyphenyl）glycine （EHPG）, and ovotransferrin, was studied, respectively, by means of fluorescence in 0.01 mol/L Hepes at pH 7.4 and room temperature. Fluorescence intensity showed an increase when gallium（Ⅲ） was bound to 8-hydroxyquinoline and HBED. In contrast, it was decreased with the interaction of gallium（Ⅲ） with salicylic acid and EHPG. At pH 7.4, there was N…H-O type intramolecular hydrogen bond in the former, and the latter existed O…H-O type intramolecular hydrogen bond. Fluorescence titration of apoovotransferrin with gallium（Ⅲ） displayed that the fluorescence intensity was decreased at the N-terminal binding site, while enhanced at the C-terminal binding site. It can account for the O…H-O type intramolecular hydrogen bonds for the phenolic groups of Tyr92 and Tyr191 residues at the N-terminal binding site. And there are N…H-O type intramolecular hydrogen bonds for Tyr431 and Tyr524 residues at the C-terminal binding site. In addition, under the same conditions, the conditional binding constant of gallium（Ⅲ） with EHPG or HBED determined by fluorescence method is lg KGa-EHPG=19.18 or lg KGa-HBED= 19.08.
基金supported by the Science Foundation of Education Department of Liaoning Province (Nos. 2007T053)the Natural Science Foundation of Liaoning Province, China (Nos.20082050)
文摘Nano-TiO2 was employed for the adsorption of gallium from aqueous solution in batch equilibrium experiments to investigate its adsorption properties. It was found that the adsorption efficiency of Ga（Ⅲ） was more than 96% at pH 3.0. The adsorption capacities and rates of Ga（Ⅲ） onto nano-TiO2 were evaluated as a function of solution concentration and temperature. The results were analyzed using the Langmuir adsorption isotherms. Adsorption isothermal data could be well interpreted by the Langmuir model. The mean energy of adsorption, 15.81 kJ.mol^-1, was calculated from the D-R adsorption isotherm. The kinetic experimental data properly correlate with the pseudo-second-order kinetic model. The thermodynamic parameters for the process of adsorption have been estimated. The △H and △G values of gallium（Ⅲ） adsorption on nano-TiO2 showed an endothermic and spontaneous nature of adsorption.
基金the Iran National Elites FoundationIranian Mines&Mining Industries Development&the Renovation and Geological Survey of Iran for financial support
文摘Selective separation of gallium from aluminum by ion flotation using sodium dodecyl sulfate(SDS) as an anionic surfactant and fluoride as an inorganic ligand was investigated. The experimental results were analyzed using the stability constants and speciation diagrams of fluoride metal complexes. The presence of fluoride in the solution has a positive influence upon the separation of gallium from aluminum. The results show that increasing the fluoride concentration makes a more effective separation of gallium from aluminum because of a simultaneous increase in the complexion of aluminum with fluoride and a change in the electrical charge of the aluminum(ALF_4^-). The dehydration model of LIU and DOYLE was also applied to compare the ion flotation and the selectivity coefficients of gallium over aluminum with experimental results.
基金supported by The Environment Research and Technology Development Fund (3K133005)
文摘A new extractant, [N,N-di（2-ethylhexyl）aminolmethylphenylphosphinic acid （DEAPP）, was synthesized to de- velop the mutual separation techniques of In（Ⅲ）, Ga（Ⅲ） and Zn（Ⅱ）. The extraction selectivity for In（Ⅲ）, Ga（Ⅲ） and Zn（Ⅱ） with DEAPP was higher than that of the commercial phosphorus acid extractants such as D2EHPA and PC-88A. The extraction selectivity for metal ions in 1 mob L 1 aqueous ammonium nitrate solution with DEAPP was in the following order： In（Ⅲ） 〉 Ga（Ⅲ） 〉 Zn（Ⅱ）. These selective extraction behaviors indicate that the amino moiety of DEAPP plays an important role in the mutual separation of ln（Ⅲ）, Ga（Ⅲ） and Zn（ll）. The extraction equilibria of In（Ⅲ）, Ga（Ⅲ） and Zn（Ⅱ） with DEAPP （ = HR） were expressed by the following reactions： In3＋ ＋ 2（HR）2 InR3（HR） ＋ 3H＋, Ga3＋ ＋ 1.5（HR）2 ＋ N- = GaR2（HR）（NO3） ＋ 2H＋, and Zn2＋ 4- 2（HR）2 ZnR2 （HR） 2 determined 4- 2H＋. The extraction equilibrium constants of In（Ⅲ）, Ga（Ⅲ） and Zn（Ⅱ） with DEAPP were to be Kex, M = 1.7 × 104 [dm3.mol 1], 4.17 [（dm3.mol-1）s], and 1.55 × 10 2 [-], respectively.
