合成亚砜BSO萃取钯铂机理研究

Study on Extraction Mechanism of Palladium and Platinum with Sulfoxide BSO

研究了合成亚砜BSO萃取Pd、Pt、Cu、Fe和Ni的性能。结果表明低酸度时,Pd2+几乎完全被萃取,其它金属的萃取率极低。钯易于从Pt、Cu、Fe和Ni金属中分离出来,且反萃容易。利用红外光谱研究了BSO萃取Pd和Pt的机理。低酸度时,在钯萃合物的红外光谱中,出现2个新的吸收峰(1122和931cm-1),表明BSO通过硫和氧原子以中性配位机理萃取钯;高酸度时,没有新的红外吸收峰出现,表明BSO以离子缔合机理萃取钯。BSO以离子缔合方式萃取铂。

The extraction properties of palladium, platinum, copper, iron and nickel with sulfoxide BSO were studied. The results show that Pd^2＋ can be well extracted in 0.1mol/L [HCl] and is easily separated from Pt^4＋, Cu^2＋, Fe^3＋ and Ni^2＋ by solvent extraction with synthetic sulfoxide BSO. Furthermore, Pd^2＋ in organic phase is stripped by ammonium chloride-ammonia solution in high effect. Mixed S and O coordination is confirmed with two new peaks near 1122 and 931cm^-1 at low acidity, and ion-pair is formed at high acidity by IR spectrum of BSO Pd （Ⅱ） extraction complexes. Ion-pair extraction mode is also found in Pt^4＋ extraction with BSO at high acidity.