摘要
A new extractant,[N,N-di(2-ethylhexyl)amino]methylphenylphosphinic acid(DEAPP),was synthesized to develop 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 D2 EHPA and PC-88 A.The extraction selectivity for metal ions in 1 mol·L-1aqueous ammonium nitrate solution with DEAPP was in the following order:In(III) N Ga(III) N Zn(II).These selective extraction behaviors indicate that the amino moiety of DEAPP plays an important role in the mutual separation of In(III),Ga(III) and Zn(II).The extraction equilibria of In(III),Ga(III) and Zn(II) with DEAPP(=HR) were expressed by the following reactions:In3++ 2HRT2In R3HRT + 3H+,Ga3++ 1.5HRT-2+ NO3 GaR 2eHRT N O3T + 2H+,and Zn2++ 2HRT2 Zn R2HRT2+ 2H+.The extraction equilibrium constants of In(III),Ga(III) and Zn(II) with DEAPP were determined to be Kex,M= 1.7 × 104[dm3·mol-1],4.17 [(dm3·mol-1)0.5],and 1.55 x 10-2[–],respectively.
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.
基金
supported by The Environment Research and Technology Development Fund (3K133005)
