Adsorption Performance of Ca/Fe-phosphate Composites (CFP(CC)) on U(Ⅵ)
WANG Yugang1,2, ZHANG Weimin1,2, CHEN Jiahong1,2, GUO Yadan1,2, LIU Maohan1,2, YANG Zichen2
1 State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China 2 School of Water Resources and Environmental Engineering, East China University of Technology, Nanchang 330013, China
Abstract: Anew Ca/Fe-phosphate composite CFP(CC) was prepared by sol-gel method. Static batch experiments show that the adsorption of U(Ⅵ) is most favoured under the condition of solution pH=3, composite dosage m=0.01 g and reaction time t=330 min. The experimental results on the effect of ionic strength and anions and cations on the adsorption of U(Ⅵ) by CFP(CC) show that the adsorption of U(Ⅵ) by CFP(CC) decreases with the increase of ionic strength and that both anions and cations have a certain degree of effect on the adsorption of U(Ⅵ), mainly because of the competition between these ions and U(Ⅵ) for the adsorption sites. From kinetic and isotherm models, the results show that the adsorption process of CFP (CC) for U(Ⅵ) conforms to the quasi-second-order kinetic model and Langmuir adsorption isotherm model. Combined with Dubinin-Radushkevich isotherm model, it is found that the adsorption process is mainly surface monolayer chemisorption. The maximum theoretical unit adsorption capacity of CFP(CC) is 1 250 mg·g-1 according to Langmuir isotherm model. The results of thermodynamic parameters are ΔG<0, ΔH>0 and ΔS>0, which indicates that the adsorption of U (VI) by CFP (CC) is a spontaneous, endothermic and entropy increasing process. The results of SEM-EDS, XRD, FTIR and XPS show that the main mechanism of adsorption is ion exchange and dissolution precipitation. The results of recovery experiment show that Ca/Fe-phosphate composite CFP(CC) has good recovery effect.
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2022, Vol. 36 
