Adsorption of U(Ⅳ) onto Amidoxime-functionalized Hydrothermal Carbon in the Presence of Ca-U(Ⅳ)-CO3 Complexes

• 作者: Haoyan ZHANG Runze ZHOU Yinghui XIE Yunhai LIU Zhibin ZHANG Zhimmin DONG
• 来源期刊: 材料科学与应用(英文)
• 学科: 化学
• 关键词: uranium AMIDOXIME hydrothermal carbon ADSORPTION Ca-U(VI)-CO3 COMPLEXES
• 年，卷（期）: 2019,（2）
• 页码范围: 39-47
• 页数: 9页
• 分类号: O64

摘要

The aim is collecting uranium from groundwater in which uranium mainly exists in negative species,the amidoxime-functionalized hydrothermal carbon(AO-HTC)was synthesized.From the results of N2 adsorption-desorption and SEM,AO-HTC is a small spherical surface;FT-IR and Elemental analysis showed that the amidoxime group was successfully grafted onto the surface of the material;Zeta-potential measurement showed that the amino nitrogen atom is protonated in the oxime group.The optimum pH value of AO-HTC for uranium adsorption is 6.0,and the adsorption equilibrium is reached within 80 min,which is in accordance with the pseudo-second order adsorption kinetic model.The adsorption of uranium by AO-HTC accords with the Langmuir isotherm adsorption model,and the single-layer saturated adsorption capacity is 254.13mg·g^-1.The thermodynamic parameters calculated by the adsorption isotherm indicate that AO-HTC adsorption of uranium is a spontaneous endothermic chemical process and Carbonate ion,calcium ion and humic acid concentration have great influence on uranium adsorption.The experiments results show that AO-HTC has the potential to elimination of U(Ⅳ)from groundwater.