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    • Figure 1. 

      (a) Top and side views of S-COFs with AA and AB stacking modes. (b) Comparison of uranyl extraction by S-COFs-AB from seawater in one day with other material. (c) EXAFS analysis of S-COF-AB@U and UO2(NO3)2·6H2O. (d) Sorption structures of UO22+, Na+, Mg2+, Fe3+, and VO2+ in S-COF-AB (up) and S-COF-AA (down) with corresponding sorption energies, respectively[4].