Adsorption of UO22+ on poly(N,N-diethylacrylamide-co-acrylic acid): effects of pH, ionic strength, initial uranyl concentration, and temperature

作者：Liu Tonghuan^*; Duan Xiaojiang; Duan Guojian; Wu Wangsuo; Yang Ying; Zhang Hongxia

来源：Journal of Radioanalytical and Nuclear Chemistry, 2013, 298(1): 571-580.

DOI：10.1007/s10967-013-2434-x

• Poly(N,N-diethylacrylamide-co-acrylic acid)
• Microgels
• Adsorption
• UO22+

We prepared poly(N,N-diethylacrylamide-co-acrylic acid) (P(DEA-co-AA)) microgels which could efficiently remove UO2 (2+) from aqueous solutions. In this study, the effect of adsorption parameters such as pH value, adsorbent dose, shaking time, and temperature has investigated. It is found that the pseudo-second-order model is more suitable for our experiment. The adsorption kinetic data indicated that the chemical adsorption was the swiftness processes, the adsorption equilibrium could be achieved within 30 min. And there are very good correlation coefficients of linearized equations for Langmuir isotherm model, which indicated that the sorption isotherm of the hydrogel for UO2 (2+) can be fitted to the Langmuir isotherm model. The adsorption process was spontaneous (a dagger G (0) < 0) and exothermic (a dagger H (0) < 0). The adsorbed UO2 (2+) can be desorbed effectively by 0.1 M HNO3 and the adsorption capacity is not significantly reduced after five cycles. Present study suggests that this P(DEA-co-AA) can be used as a potential adsorbent for sorption UO2 (2+) and also provide a simple, fast separation method for removal of UO2 (2+) ions from aqueous solution.

• 出版日期2013-10
• 单位兰州大学