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首页> 外文期刊>Separation and Purification Technology >Extraction of Pb(II) by XAD7 impregnated resins with organophosphorus extractants (DEHPA, IONQUEST 801, CYANEX 272)
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Extraction of Pb(II) by XAD7 impregnated resins with organophosphorus extractants (DEHPA, IONQUEST 801, CYANEX 272)

机译：XAD7浸渍树脂与有机磷萃取剂（DEHPA，IONQUEST 801，CYANEX 272）萃取Pb（II）

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摘要

The aim of this work is to study the extraction of Pb(II) from nitrate solutions (0.1 m) by solvent impregnated resins (SIR). The resins have been prepared by impregnating the amberlite XAD7 using three different organophosphorus extractants namely DEHPA, IONQUEST 801 and CYANEX 272. The impregnation of XAD7 is characterised by a higher affinity for DEHPA than for IONQUEST 801 and CYANEX 272. The adsorption of the extractant has been studied by FTIR which shows that the immobilisation of the extractant results from hydrophobic interaction between the alkyl group of the extractant and the aliphatic chain of the support, and also from other mechanisms like polar or electrostatic forces. Batch sorption studies shows that the sorption of the metal increases with aqueous pH solution and the best sorption efficiency obtained is higher than 95% for DEHPA and IONQUEST 801 in the pH range of 2.75-3 and 3.5-3.75, respectively, and it is about 70% for CYANEX 272 in the pH range 4.5-4.75. An equilibrium model is proposed for the analysis of the distribution data. The extraction of Pb(II) can be explained by the formation of PbL2 and PbNosL complex in the resin phase in the case of XAD7-DEHPA resin, by the formation of PbL_2HL_2 and PbNo_3L complex in the case of XAD7-IONQUEST 801, and by the formation of the single complex PbLNo_3HL in the case of XAD7CY-ANEX 272. The equilibrium constants of these species are also reported.
机译：这项工作的目的是研究溶剂浸渍树脂（SIR）从硝酸盐溶液（0.1 m）中提取Pb（II）的方法。该树脂是通过使用三种不同的有机磷萃取剂DEHPA，IONQUEST 801和CYANEX 272浸渍琥珀铁矿XAD7制备的。XAD7的浸渍特征是对DEHPA的亲和力高于对IONQUEST 801和CYANEX 272的亲和力。 FTIR对萃取剂的固定化研究表明，萃取剂的固定化是由于萃取剂的烷基与载体的脂族链之间的疏水相互作用，以及极性或静电力等其他机理的结果。分批吸附研究表明，金属的吸附随pH水溶液的增加而增加，在2.75-3和3.5-3.75的pH范围内，DEHPA和IONQUEST 801的最佳吸附效率分别高于95％。 CYANEX 272在pH范围4.5-4.75中为70％。提出了一个平衡模型来分析分布数据。在XAD7-DEHPA树脂的情况下，可以通过在树脂相中形成PbL2和PbNosL络合物，在XAD7-IONQUEST 801的情况下可以通过形成PbL_2HL_2和PbNo_3L络合物来解释Pb（II）的提取。在XAD7CY-ANEX 272的情况下，单个复合物PbLNo_3HL的形成。还报道了这些物质的平衡常数。

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