One-pot synthesis of mercapto functionalized Zr-MOFs for the enhanced removal of Hg2+ ions from water
Mercapto functionalized Zr-MOFs have been developed via a one-pot synthesis for selective adsorption of Hg2+ ions. Mercaptoacetic acid (MAA) or alpha lipoic acid (ALA) was used as the modulator and functionalized molecule to synthesize the mercapto functionalized Zr-MOFs (Zr-MOFs-SH(O)). In comparison with the mercapto functionalized Zr-MOFs via the traditional postsynthetic modification (Zr-MOFs-SH(P)), the Zr-MOFs-SH(O) had much higher content of -SH groups, thus leading to a much higher adsorption capacity for Hg2+ ions. Specially, PCN-224-MAA(O) had an adsorption capacity for Hg2+ ions up to 843.6 mg/g, which is much higher than that of PCN-224-MAA(P) (138.5 mg/g). Additionally, the PCN-224-MAA(O) can be used to reduce the Hg2+ ions concentrations (5-20 μg/L) from water to limit acceptable (1 μg/L) for drinking water. Moreover, the PCN-224-MAA(O) also exhibited good selectivity, recyclability, and chemical stability.