writer：Linzhe Xu, Yingbo Chen,*, Wenxuan Su, Junbo Cui , Siyu Weil.,
keywords：U(VI) adsorption ,MXene ,Mixed matrix membrane
source：期刊
specific source：Separation and Purification Technology 309 (2023) 123024
Issue time：2023年

Two-dimensional  metal  carbides  (MXene)  and  amidoxime-based  materials  have  attracted  more  and  more attention in heavy metal adsorption. Herein, we prepared a mixed matrix membrane of amidoximized poly-acrylonitrile with MXene particles by a simple phase separation method (M/PAO mixed matrix membrane). The M/PAO mixed matrix membrane had excellent U(VI) ion selectivity compared to vanadium. Under the syner-gistic adsorption of the two functional adsorption units, the maximum adsorption capacity can reach 10.31 g/m2 

(364.46 mg/g) at pH = 6, while the adsorption capacity of U(VI) can reach 37.49 mg/m2 (1.3225 mg/g) in a seven-day natural seawater experiment, which was far more than that of single amidoxime-based adsorbent. Pseudo-second-order kinetics and Langmuir adsorption model were used to study the adsorption behavior. The results of various characterization methods showed the complexation mechanism between the M/PAO mixed matrix membrane and U(VI) ions. Considering its excellent adsorption capacity and facile preparation process, 

we believe that the M/PAO mixed matrix membrane is one of the most promising candidates for large-scale U(VI) extraction from seawater.