One-pot synthesis of mercapto functionalized Zr-MOFs for the enhanced removal of Hg²⁺ ions from water
2019
LinThese two authors contributed equally to this work., Daiwu | Liu, Xiao | Huang, Renliang | Qi, Wei | Su, Rongxin | He, Zhimin
Mercapto functionalized Zr-MOFs have been developed via a one-pot synthesis for the selective adsorption of Hg²⁺ ions. Mercaptoacetic acid (MAA) or alpha lipoic acid (ALA) was used as the modulators and functionalized molecules to synthesize 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)), Zr-MOFs-SH(O) had a much higher content of –SH groups, thus leading to a much higher adsorption capacity for Hg²⁺ ions. In particular, PCN-224-MAA(O) had an adsorption capacity for Hg²⁺ ions up to 843.6 mg g⁻¹, which is much higher than that of PCN-224-MAA(P) (138.5 mg g⁻¹). Additionally, PCN-224-MAA(O) can be used to reduce Hg²⁺ ion concentrations (5–20 μg L⁻¹) in water to the limit acceptable (1 μg L⁻¹) for drinking water. Moreover, PCN-224-MAA(O) also exhibited good selectivity, recyclability, and chemical stability.
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