Novel Luffa cylindrica (LC) adsorbent modified with polyethyleneimine (PEI) was prepared by “grafting-from” approach (LC-EPI-PEI) and “grafting-to” approach (LC-PGMA-PEI) and employed for the adsorption of U(VI) from seawater. The critical factors affecting U(VI) adsorption from aqueous solution were exploited, such as pH, initial concentration and contact time. The results showed that the adsorption of U(VI) on LC-EPI-PEI and LC-PGMA-PEI was strongly dependent on pH. The adsorption isotherm was satisfactorily simulated by the Langmuir model and the maximum monolayer adsorption capacities of U(VI) was 208.3 mg/g on LC-EPI-PEI and 438.5 mg/g on LC-PGMA-PEI. The accordance of kinetic data with the pseudo-second order model suggested that the adsorption reaction was controlled chemical process. In addition, LC-PGMA-PEI exhibited excellent reusability even after ten recycles. Moreover, LC-PGMA-PEI displayed excellent adsorption properties at low concentration of U(VI) (μg/L) in aqueous solution as well as in simulated seawater.

聚乙烯亚胺（PEI）改性的新型丝瓜环（LC）吸附剂是通过“接枝”方法（LC-EPI-PEI）和“接枝”方法（LC-PGMA-PEI）制备的，并用于U的吸附。 （六）海水。利用影响水溶液吸附U（VI）的关键因素，例如pH值，初始浓度和接触时间。结果表明，U（VI）在LC-EPI-PEI和LC-PGMA-PEI上的吸附强烈依赖于pH值。用Langmuir模型令人满意地模拟了吸附等温线，U（VI）的最大单层吸附容量在LC-EPI-PEI上为208.3 mg / g，在LC-PGMA-PEI上为438.5 mg / g。动力学数据与伪二级模型相符，表明吸附反应是受控的化学过程。此外，即使经过十次循环，LC-PGMA-PEI仍具有出色的可重复使用性。此外，LC-PGMA-PEI在低浓度的U（VI）（μg/ L）在水溶液和模拟海水中均表现出优异的吸附性能。