新型杯[4]芳烃磷酸酯衍生物的合成及其对U(Ⅵ)的萃取性能

Synthesis of novel calix[4]arene phosphate derivative and its extraction performance for uranium(Ⅵ)

以氯磷酸二苯酯作为取代基,通过取代反应对杯[4]芳烃下沿进行修饰,合成出一种新型杯[4]芳烃磷酸酯衍生物,并采用傅立叶红外光谱对其表征。考察pH值、萃取剂浓度、萃取时间、萃取温度对杯[4]芳烃磷酸酯衍生物萃取U(Ⅵ)的影响。结果表明:在铀的初始浓度为5mg/L时,杯[4]芳烃磷酸酯衍生物萃取铀的最佳条件是pH值为4.0,温度为25℃,萃取剂浓度为0.20 g/L,萃取平衡时间为2 h。杯[4]芳烃磷酸酯衍生物对铀的萃取过程符合准二级反应动力学模型。此外,在有多种共存离子的情况下,杯[4]芳烃磷酸酯衍生物表现出对U(Ⅵ)良好的选择性萃取能力。

Diphenyl chlorophosphate was used as the substituent to react with the calix[4]arene to synthesize a novel calix[4]arene phosphate derivative. The calix[4]arene phosphate derivative was characterized by FT-IR. The effects of pH value, concentration of extractant, extraction time and temperature on the extraction of U(Ⅵ) by calix[4]arene phosphate derivatives were investigated. The results show that the optimum conditions for the extraction of uranium by calix[4]arene phosphate derivative are as follows. The pH value is 4.0, the temperature is 25 ℃, the concentration of extractant is 0.20 g/L and the extraction balance time is 2 h when the initial concentration of uranium is 5 mg/L. The extraction process of uranium by calix[4]arene phosphate derivative conforms to the pseudo-second-order reaction kinetic model. Besides, in the presence of multiple coexisting ions, the calix[4]arene phosphate derivative exhibits good selectivity to uranium(Ⅵ).