期刊
CHEMOSPHERE
卷 287, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.131919
关键词
Layered double hydroxides; Polydopamine; Melamine sponge; Uranium (VI); Adsorption
资金
- Open Funds of Key Laboratory of Marine Special Materials, Ministry of Industry and Information Technology
- Fundamental Research Funds of the Central University
- Natural Science Foundation of Heilongjiang Province [LH2020E112, JJ2020LH2199]
The MP@LDH adsorbent demonstrated high adsorption capacity and selectivity for U(VI) extraction from aqueous solution, with a removal rate of almost 90% in competitive sorption experiments. Additionally, it achieved an 88.18% removal rate under simulated seawater conditions, showing great potential for practical application in extracting uranium from seawater.
Uranium (VI) (U(VI)) is a major fuel for nuclear power, and the mass of it in seawater is about 4.5 billion tons. However, many current U(VI) adsorbents exist in the form of powder, which hinders the smooth recovery of U (VI) from aqueous solutions and its application in actual environments. Herein, the MP@LDH as an easy-torecover and 3D macroscopic adsorbent for U(VI) extraction from aqueous solution was successfully prepared. The adsorbent was obtained via anchoring of LDH on the surface of melamine sponge (MS) coated with polydopamine (PDA). The maximum experimental adsorption capacity of MP@LDH sponge for U(VI) was as high as 559.8 mg g-1 (at pH = 8.0, T = 298 K). In the competitive sorption experiments against the competitions of Ba (II), Sr(II), Zn(II) and others ions, MP@LDH still exhibited a particularly excellent selectivity for U(VI) (almost 90% removal rate). Furthermore, the removal rate of MP@LDH towards U(VI) reached 88.18% under simulated seawater (C0 = 3.47 mu g L-1). We believe that the MP@LDH with easy retrieval, excellent selectivity and uptake amount provides a convenient way for U(VI) extraction from seawater.
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