摘要
在pH>1、0<pH≤1、pH<0三种条件下,对P_(204)-煤油体系以及P_(204)-HCl-H_3AOH体系负载La有机相进行红外光谱测试,研究了酸度对P_(204)-HCl-H_3AOH体系萃取La(Ⅲ)的机理影响。研究结果表明,当pH>1时,萃取过程的实质是La离子与P-OH置换,遵循阳离子交换机制;0<pH≤1时,萃取过程是由P=O基团与P-OH基团同时参与与La的配合作用,其配合机制为阳离子交换机制和溶剂化配合双重机制,该机制增强了对La的萃取能力使萃取容量提高;pH≤0时,萃取过程是由P=O基团与P-OH基团同时参加的配合反应,但是P=O基团占主要优势。
In the conditions of pH1,0pH≤1 and pH0,P_（204）-kerosene system and the organic phase loading La in the P_（204）-HCl-H_3 AOH were studied by infrared spectroscopy.The effect of acidity on extraction mechanism of La（Ⅲ） in P_（204）-HCl -H_3AOH extraction system was investigated.The results show that displacement reaction between La and P-OH,and the mechanism is cation exchange when the value of pH1.Both the group of P=O and the group of P-OH react with La and the extraction mechanism is the dual mechanism theory of cation exchange mechanism and salvation complex mechanism. Thus,the extraction capacity of La in the condition of 0pH≤1 is increased.When the value of pH≤0,the two groups of P =O and P-OH,especially P=O,take part in the complex reaction.
出处
《辽宁石油化工大学学报》
CAS
2010年第1期15-18,共4页
Journal of Liaoning Petrochemical University
