| 硫酸铵-溴化四丁基铵水体系液液萃取分离铅 |
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| 引用本文： | 吴艳平,许虹,黄婷婷.硫酸铵-溴化四丁基铵水体系液液萃取分离铅[J].河南师范大学学报(自然科学版),2009,37(1). |
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| 作者姓名： | 吴艳平 许虹 黄婷婷 |
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| 作者单位： | 佛山科学技术学院,理学院,广东,佛山,528000 |
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| 摘 要： | 研究了硫酸铵-溴化四丁基铵(TBAB)-水体系萃取分离铅的行为及其与常见离子的分离条件.试验表明,TBAB的水溶液在硫酸铵的作用下盐析,形成了液-液两相,在pH3～5的克拉克-鲁布斯缓冲溶液中,Pb2+与Br-形成的络阴离子PbBr42-能与溴化四丁基铵TBA+形成疏水性的三元离子缔合物(TBA+)2(PbBr42-)而被萃取到上层TBAB相,其他共存离子:Zn2+,Cu2+,Ni2+,Co2+,Mn2+,Fe3+不被萃取.控制溶液的酸度,该体系能够使Pb2+与常见金属离子Zn2+,Cu2+,Co2+,Ni2+,Mn2+,Fe3+等完全分离.对合成水样进行了萃取分离测定,结果满意.
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| 关 键 词： | 溴化四丁基铵 硫酸铵 液-液萃取 铅 |
Separation of Lead with Ammonium Sulfate-Tetrabutylammonium Bromide Aqueous two-phase Liquid-Liquid Extraction System |
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| WU Yan-ping,XU Hong,HUANG Ting-ting.Separation of Lead with Ammonium Sulfate-Tetrabutylammonium Bromide Aqueous two-phase Liquid-Liquid Extraction System[J].Journal of Henan Normal University(Natural Science),2009,37(1). |
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| Authors: | WU Yan-ping XU Hong HUANG Ting-ting |
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| Affiliation: | Department of Chemistry;Foshan University;Foshan 528000;China |
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| Abstract: | The extraction separation behaviour of lead with(NH4)2SO4-tetrabutylammonium bromide(TBAB)-H2O system and the conditions for the separation of lead with other metal ions are studied.The results show that TBAB in aqueous solution of ammonium sulfate under salting-out,forming a liquid-liquid two-phase,in a pH 3～5 to Clark-Lubs buffer solution,Pb(Ⅱ)can react with Br-to form complex anion PbBr2-4,and the resulting PbBr2-4 reacts with TBA+ to form ion-association complex(TBA+)2(PbBr2-4)which can be extracted into the upper TBAB phase,other ions:Zn2+,Cu2+,Ni2+,Co2+,Mn2+,Fe3+ can not be extraction.Pb(Ⅱ)can be totally separated from Zn2+,Cu2+,Co2+,Ni2+,Mn2+ and Fe3+ by controlling the acidity of the solution.The method has been used for the extraction separation of Pb2+ in the synthetic sample of water and the result is satisfactory. |
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| Keywords: | tetrabutylammonium bromide ammounium sulphate liquid-liquid extraction lead |
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