不对称亚砜BSO萃取铂的性能及机理研究

Study on Behaviour and Mechanism of Extraction of Platinum (Ⅳ) with Unsymmetrical Sulfoxide BSO

摘要:

研究了不对称亚砜BSO从盐酸介质中萃取铂的性能和机理。结果表明：待萃液Pt(IV)浓度为1.000 g· L-1，HCl浓度为4 mol·L-1，用0.5 mol·L-1 BSO-煤油按相比1:1混合萃取Pt(IV)，经过5 min的萃取振荡，萃取率可达99.55%。亚砜BSO萃取Pt(IV)的反应是放热反应，分配比随温度的升高而下降，反应焓为–12.35 kJ·mol-1。通过斜率法、紫外-可见光谱和红外光谱分析表明，在1~5 mol·L-1的HCl范围内，BSO萃取Pt(IV)的机理为酸性离子缔合萃取

Abstract:

The behaviour and mechanism of extraction of platinum (IV) with unsymmetrical sulfoxide BSO from HCl media are studied. The results showed that the percentage extraction of Pt (IV) achieved 99.55% from 4 mol·L-1 HCl media with 0.5 mol·L-1 BSO-kerosene as an extractant. This was an exothermic reaction with an enthalpy of –12.35 kJ·mol-1. The structure of complex was discussed by slope analysis method, UV spectra, FT-IR spectra. The extraction mechanism under the above mentioned conditions could be determined to be an ion-pair formation with the protonated BSO, and the composition of complex may be [2(BSOH+)]·[PtCl62-]·[BSO·HCl]·[2BSO](0).