摘要
研究了三烷基氧膦（ＴＲＰＯ）萃取剂对Ｆｅ（Ⅲ）的萃取性能，测定了 ＴＲＰＯ对Ｆｅ（Ⅲ）的萃取随萃取平衡时间，水相 ＨＮＯ３浓度， Ｆｅ（Ⅲ）浓度和温度的变化。计算了萃取反应的焓变△Ｈ°，熵变△Ｓ°及表观平衡常数Ｋ。结果表明：体积分数为３０％的ＴＲＰＯ－煤油萃取体系萃取模拟高放废液时，三相的产生与水溶液中Ｆｅ（Ⅲ）离子的浓度紧密相关。当水溶液中［Ｈ＋］＝１．５ｍｏｌ／Ｌ－１， ρ［Ｆｅ（Ⅲ），初始］＞８．０ｇ／Ｌ时，萃取体系出现第三相。测定了轻、重两个有机相的体积比和 Ｆｅ含量比随水相 Ｆｅ（Ⅲ）离子初始浓度的变化，讨论了 ＴＲＰＯ与 Ｆｅ（Ⅲ）络合的溶剂化数ｎ。
The extraction properties of TRPO for Fe (Ⅲ ) are examined as a function of extraction equilibrium time, temperature, nitric acid concentration and Fe(Ⅲ ) concentration in aqueous solution. The an', △S° and apparent equilibrium constant K of Fe (Ⅲ ) extraction reaction have been calculated. The experimental results show that the third phase appearance in 30% TRPO extraction system is in relation to Fe(Ⅲ ) concentration in aqueous solution. When nitric acid concentration is 1. 5 mol/L and Fe (M ) initial concentration is higher than 8. 0 g/L in aqueous solution, the extraction system appears the third phase. Two organic phase volume ratio and Fe(Ⅲ ) concentration ratio in the organic phase have been determined respectively.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1995年第6期52-58,共7页
Journal of Tsinghua University(Science and Technology)
关键词
萃取
三烷基氧膦
铁
高放废液
萃取液
exrtaction
trialkylphosphine oxide (TRPO)
ferric ions
