三辛基氧化磷(TOPO)萃取钯机理的研究

Study on the Extraction Mechanism of Palladium with tri -n-octyl phosphine oxide (TOPO)

本文报道了三辛基氧化磷（ＴＯＰＯ）从高氯酸体系中萃取钯的机理。结果表明：钯的萃取率随ｐＨ的增大而增大与高氯酸根离子浓度无关。采用斜率法测得萃合物组成为：Ｐｄ·Ｌ４。萃取反应方程式为： ４ＴＯＰＯ（ｏ）＋Ｐｄ（Ａ）２＋＋２ＣＩＯ４＝〔Ｐｄ·ＴＯＰＯ４〕（ＣＬＯ４）２（０）

The extraction mechenism of Palladium from perchloric acid medium by tri-n-octyl phosphine oxide(TOPO)has been studied. The results showed extraction rate of palladium increased with increase of the pH,and no relationship with concentration of perchlorate. The composition of the extraction is Pd·L4 as determined by slope methed. The exteaction mechanism of palladium with TOPO besed on UV -vis-spectra was proved to be complexic extrcation reaction as follows: 4TOPO(o) +Pd(A)2+ +2clo4(A)=〔pd· TOPO4〕(clo4)2(0)