3D self-assembly polyethyleneimine modified graphene oxide hydrogel for the extraction of uranium from aqueous solution

作者：Wang, Xue; Liu, Qi^*; Liu, Jingyuan; Chen, Rongrong; Zhang, Hongsen; Li, Rumin; Li, Zhanshuang; Wang, Jun^*

来源：Applied Surface Science, 2017, 426: 1063-1074.

DOI：10.1016/j.apsusc.2017.07.203

• Polyethyleneimine
• Graphene hydrogel
• Uranium (VI)
• Adsorption

3D self-assembly polyethyleneimine-modified graphene oxide hydrogel (PEI-GH) was successfully synthesized via a simple one-step method without using other harsh chemicals. The unique three-dimensional (3D) porous network of PEI-GHs is achieved by using polyethyleneimine (PEI) as the cross-linking agent which also facilitate the self-assembly of GO sheets. With unique porous structure, large surface area and sufficient active sites, the PEI-GH has outstanding adsorption capacity (898mg/g), large removal rate (>90% at ppm level, or similar to 85% for ppb level simulated seawater) and high selectivity of uranium. The adsorption process was described well with the pseudo-second-order kinetic model and Langmuir isotherm model. The thermodynamic parameters indicated that the adsorption process was spontaneous and endothermic. Based on the above results, the PEI-GH materials exhibits promising adsorption performance and high removal rate for uranium (VI) from aqueous solution and simulated seawater.

• 出版日期2017-12-31
• 单位哈尔滨工程大学