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    A biomass fiber adsorbent grafted with phosphate/amidoxime for efficient extraction of uranium from seawater by synergistic effect

    Year: 2023

    Journal: Journal of Environmental Management, Volume 337, 2023-07-01, page 117658

    Authors: Ye, Xiaoxia; Chi, Ruiyang; Wu, Zhihao; Chen, Jinteng; Lv, Yuancai; Lin, Chunxiang; Liu, Yifan; Luo, Wei

    Keywords: Collagen fibers; Phosphoric acid and amidoxime functional groups; Seawater; Ultraselective extraction; Uranium extraction

    There are approximately 4 billion tons of uranium in the ocean, which is unmatched by the surface. Nevertheless, it's very challenging to extract uranium from the ocean due to the exceedingly low concentration of uranium in the ocean (about 3.3 μg L−1) as well as high salinity level. Current methods are often limited by selectivity, sustainability, economics, etc. Herein, phosphoric acid group and amidoxime group were grafted to skin collagen fibers through " initiated access” to design a new uranium extraction material, abbreviated as CGPA. Through laboratory simulation experiments, it is concluded that the maximum adsorption capacity of CGPA for uranium reaches 263.86 mg g−1. It has high adsorption, selectivity, and reusability for uranium. In the actual seawater extraction experiment, CGPA obtained 29.64 μg of uranium after extracting 10.0 L of seawater, and the extraction rate was 90.1%. The adsorbent has excellent effects in kinetics, selectivity, extraction capacity, renewability, etc. In the extraction of uranium from seawater, and is an economically feasible and industrially expandable adsorbent.
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