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

作者：Wang, Cheng; Peng, Guo Wen^*; Xiao, Fang Zhu; Yu, Li Mei; Pu, Yi Qiu; Xu, Yu Li; Zhang, Kang; Xu, Dong Yang; Liu, Yong

来源：Chinese Journal of Nonferrous Metals, 2019, 29(3): 659-664.

DOI：10.19476/j.ysxb.1004.0609.2019.03.24

• Balance time
• Calix[4]arenes
• Extractants
• Extraction process
• Extraction time
• Initial concentration
• Optimum conditions
• Pseudo-second order reactions

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).