A facile method by means of MOF materials is used for the first time for the extraction of U(vi) ions from seawater, showing a significant extraction efficiency of 0.53 mg g−1.

A significant synergic effect between a metal–organic framework (MOF) and Fe2SO4, the so‐called MOF+ technique, is exploited for the first time to remove toxic chromate from aqueous solutions. The results show that relative to the pristine MOF samples (no detectable chromate removal), the MOF+ method enables super performance, giving a 796 Cr mg g−1 adsorption capacity. The value is almost eight‐fold higher than the best value of established MOF adsorbents, and the highest value of all reported porous adsorbents for such use. The adsorption mechanism, unlike the anion‐exchange process that dominates chromate removal in all other MOF adsorbents, as unveiled by X‐ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), is due to the surface formation of Fe0.75Cr0.25(OH)3 nanospheres on the MOF samples.

Mercury (Hg 2+ ), even ultra-low-concentration amount in water, presents a serious environment concern. Thus, the removal, especially Hg (II) content in the ultratrace level (ppb), from water is still challenging. In this work, without any pretreatment, one novel MOF material can act as high-capacity and collectable adsorbent for the removal of Hg (II) from water, especially for ultratrace Hg 2+ ion in the ppb magnitude, mainly due to a combined effect from the pore walls functionalized by free-standing, accessible acylamide and hydroxyl units.

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