铀
吸附
海水
水溶液
萃取(化学)
化学
核化学
色谱法
无机化学
材料科学
冶金
有机化学
地质学
海洋学
作者
Yan Wang,Yueyong Jiang,Yong Zhang,Xiaolin Liu,Song Sun,Shiyi Qin,Jiaqi Huang,Bo-Wei Chen
出处
期刊:Chemosphere
[Elsevier]
日期:2023-12-01
卷期号:343: 140257-140257
标识
DOI:10.1016/j.chemosphere.2023.140257
摘要
A novel amidoxime-functionalized magnetic hydroxyapatite (AFNH) was successfuly fabricated to extract uranium from aqueous solution and seawater. The introduction of amidoxime group not only increased the number of active site of AFNH to speed up the adsorption rate and increase the extraction capacity, but also adjusted the optimal extraction pH from 4 to 8, which was beneficial for capturing uranium from seawater. The maximum adsorption capacity and adsorption efficiency at pH 8 were 945.2 mg g-1 and 99.2%, respectively. AFNH still had good removal efficiency (above 90%) after five cycles, indicating the good regeneration of AFNH. After uranium adsorption, AFNH could be easily recycled by magnetic separation due to its magnetism. In simulated seawater, AFNH also showed excellent uranium removal performance with high adsorption efficiency (84.9%) and adsorption capacity (1.70 mg g-1). Furthermore, the 14-day uranium extraction capacity of AFNH in natural seawater could reach 5.93 mg g-1. The SEM, FTIR, XRD and XPS analyses showed that the enhanced uranium extraction performance of AFNH was mainly attributed to electrostatic interaction, complexation and co-precipitation. In conclusion, AFNH was expected to be a candidate as adsorbent with great potential in extracting uranium from seawater.
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