Preparation of p-carboxyphenyl azo calix[4]arene phosphate derivative and its extraction properties toward uranium(VI)

• Published in: Journal of radioanalytical and nuclear chemistry Vol. 317; no. 3; pp. 1235 - 1241
• Main Authors: Wang, Cheng, Xiao, Fang-zhu, Pu, Yi-qiu, Xu, Yu-li, Xu, Dong-yang, Zhang, Kang, Liu, Yong, Peng, Guo-wen
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.09.2018; Springer; Springer Nature B.V
• Subjects: Chemistry; Chemistry and Materials Science; Diagnostic Radiology; Extraction processes; Hadrons; Heavy Ions; Inorganic Chemistry; NMR; Nuclear Chemistry; Nuclear magnetic resonance; Nuclear Physics; Physical Chemistry; Process parameters; Reaction kinetics; Uranium; Functionalized modification; Extraction; Calixarene; Uranium(VI)
• ISSN: 0236-5731; 1588-2780
• DOI: 10.1007/s10967-018-6000-4

P -carboxyphenyl azo calix[4]arene phosphate derivative (P-CACPD) was successfully synthesized using calix[4]arene as raw material. The P-CACPD was characterized by FT-IR and 1 H-NMR. The effects of pH, extraction time and temperature on the extraction of U(VI) by P-CACPD were investigated. The results show that pH value, extraction time and temperature have an effect on the extraction of U(VI) by P-CACPD. When the initial pH is 5, temperature is 25 °C, extraction time is 2 h, the extraction rate of U(VI) by P-CACPD reaches the maximum. Both kinetics parameters and thermodynamic parameters of the extraction process were calculated. The calculated data indicate that the extraction process of uranium by P-CACPD is an exothermic spontaneous process, which well fits with the pseudo-second-order kinetic model.