Preparation of <Emphasis Type="Italic">p</Emphasis>-carboxyphenyl azo calix[4]arene phosphate derivative and its extraction properties toward uranium(VI) |
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| Authors: | Cheng Wang Fang-zhu Xiao Yi-qiu Pu Yu-li Xu Dong-yang Xu Kang Zhang Yong Liu Guo-wen Peng |
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| Institution: | 1.School of Chemistry and Chemical Engineering,University of South China,Hengyang,People’s Republic of China;2.School of Public Health,University of South China,Hengyang,People’s Republic of China;3.School of Environmental and Safety Engineering,University of South China,Hengyang,People’s Republic of China;4.Hunan Province Engineering Technology Research Center of Uranium Tailings Treatment,University of South China,Hengyang,People’s Republic of China |
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| Abstract: | P-carboxyphenyl azo calix4]arene phosphate derivative (P-CACPD) was successfully synthesized using calix4]arene as raw material. The P-CACPD was characterized by FT-IR and 1H-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. |
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