三辛基氧化膦萃取钯热力学研究  

Themodynamic study on the extraction of palladium with tri-n-octyl phosphine oxide

作　　者：董彦杰[1] 刘建宁[1] 盖轲[1] 巩新兴 

机构地区：[1]庆阳师范高等专科学校化学系,甘肃西峰745000

出　　处：《宝鸡文理学院学报（自然科学版）》1999年第4期20-22,共3页Journal of Baoji University of Arts and Sciences(Natural Science Edition)

摘　　要：研究了三辛基氧化膦（ＴＯＰＯ）从高氯酸介质中萃取钯的热力学。通过考察［ＴＯＰＯ］对Ｐｄ（ＩＩ）的影响，测出了萃取反应的表观平衡常数Ｋ、焓变△Ｈ、自由能变△Ｇ和熵变△Ｓ。Studied here is the thermodynamic of the extractin of palladium with tri-n-octyl phosphine oxide(TOPO) from perchloric acid medium.By investigating the influeneces of temperature and[TOPO] upon the distribution ratio D of Pd(Ⅱ),it is concluded that when the initial concentration of ClO - 4 is 0.1 mol/L,the relationship between lg D and lg[TOPO] at 25℃ is represented as lg-D-=3.871lg[TOPO]+10.50 and that when the initial concentration of TOPO and pH are 1.0×10 -3 mol/L and 0.80 respectively,the relationship between lg D and 1/ T is shown as lg D =1 031.8/ T -4.222 The values of thermodynamic function at 25℃ are as follows: K ex=3.16×10 8;△ H =-19.77kJ/mol; △ G =-48.52kJ/mol;△ S =96.41J/mol·K.

关 键 词：萃取 热力学 钯 三辛基氧化膦 

分 类 号：O614.823[理学—无机化学] O658.2[理学—化学]