研究了D418螯合树脂在NaOAc-HOAc缓冲溶液中对In^(3+)的吸附性能与机理,结果表明,D418树脂在不同温度下吸附In^(3+)的表观吸附速率常数分别为k_(293K)=2.07×10^(-4)s^(-1),k_(313K)=3.49×10^(-4)s^(-1),k_(393K)=1.42×10...研究了D418螯合树脂在NaOAc-HOAc缓冲溶液中对In^(3+)的吸附性能与机理,结果表明,D418树脂在不同温度下吸附In^(3+)的表观吸附速率常数分别为k_(293K)=2.07×10^(-4)s^(-1),k_(313K)=3.49×10^(-4)s^(-1),k_(393K)=1.42×10^(-3)s^(-1),表观吸附活化能Ea=38.84 k J·mol^(-1);树脂吸附In^(3+)热力参数△H=96.27 k J·mol^(-1),△S=349.19 J·(mol·K)^(-1),△G_(298K)=-6.04 k J·mol^(-1);吸附过程能较好地遵循Langmuir等温吸附规律。采用红外光谱方法探讨了吸附机理,结果表明,D418树脂功能基氨基和磷酸根与In^(3+)形成了配位键。展开更多
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
A novel catalyst indium(Ⅲ) tribromide is shown to efficiently promote 5-carbonyl-4-aryl-3,4-dihydropyrimidin-2(1H)-ones from a three-component coupling of β-diketones, aldehydes and urea in ethanol. This modified on...A novel catalyst indium(Ⅲ) tribromide is shown to efficiently promote 5-carbonyl-4-aryl-3,4-dihydropyrimidin-2(1H)-ones from a three-component coupling of β-diketones, aldehydes and urea in ethanol. This modified one-pot Biginelli′s cyclocondensation not only features simple operation, but also takes place in nonpolluted environment. The structure of the Biginelli reaction product from β-diketones, salicylaldehyde and urea has been proposed to possess an oxygen-bridge.展开更多
文摘研究了D418螯合树脂在NaOAc-HOAc缓冲溶液中对In^(3+)的吸附性能与机理,结果表明,D418树脂在不同温度下吸附In^(3+)的表观吸附速率常数分别为k_(293K)=2.07×10^(-4)s^(-1),k_(313K)=3.49×10^(-4)s^(-1),k_(393K)=1.42×10^(-3)s^(-1),表观吸附活化能Ea=38.84 k J·mol^(-1);树脂吸附In^(3+)热力参数△H=96.27 k J·mol^(-1),△S=349.19 J·(mol·K)^(-1),△G_(298K)=-6.04 k J·mol^(-1);吸附过程能较好地遵循Langmuir等温吸附规律。采用红外光谱方法探讨了吸附机理,结果表明,D418树脂功能基氨基和磷酸根与In^(3+)形成了配位键。
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.
文摘A novel catalyst indium(Ⅲ) tribromide is shown to efficiently promote 5-carbonyl-4-aryl-3,4-dihydropyrimidin-2(1H)-ones from a three-component coupling of β-diketones, aldehydes and urea in ethanol. This modified one-pot Biginelli′s cyclocondensation not only features simple operation, but also takes place in nonpolluted environment. The structure of the Biginelli reaction product from β-diketones, salicylaldehyde and urea has been proposed to possess an oxygen-bridge.
