聚乙烯亚胺功能化丝瓜络用于高效铀提取。
Polyethyleneimine-functionalized Luffa cylindrica for efficient uranium extraction.
机构信息
Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, Harbin Engineering University, 150001, PR China.
Institute of Advanced Marine Materials, Harbin Engineering University, 150001, PR China; Harbin Shipbuilding Engineering Design & Research Academy, Harbin, PR China.
出版信息
J Colloid Interface Sci. 2018 Nov 15;530:538-546. doi: 10.1016/j.jcis.2018.03.102. Epub 2018 Mar 29.
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.
采用“接枝到”法（LC-PGMA-PEI）和“接枝从”法（LC-EPI-PEI）制备了改性后的新型丝瓜络（LC）吸附剂，并用其从海水中吸附 U(VI)。探讨了影响水溶液中 U(VI)吸附的关键因素，如 pH 值、初始浓度和接触时间。结果表明，LC-EPI-PEI 和 LC-PGMA-PEI 对 U(VI)的吸附强烈依赖于 pH 值。Langmuir 模型很好地模拟了吸附等温线，LC-EPI-PEI 对 U(VI)的最大单层吸附容量为 208.3 mg/g，LC-PGMA-PEI 为 438.5 mg/g。动力学数据与准二级模型的一致性表明，吸附反应受化学过程控制。此外，即使经过十次循环，LC-PGMA-PEI 仍表现出良好的可重复使用性。此外，LC-PGMA-PEI 在水溶液和模拟海水中 U(VI)（μg/L）低浓度时表现出优异的吸附性能。
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